In Press
4Shaping of the present-day deep biosphere at Chicxulub by the impact catastrophe that ended the Cretaceous
Charles S. Cockell, Marco J. L. Coolen, Bettina Schaefer, Kliti Grice, Cornelia Wuchter, Luzie Schnieders, Joanna V. Morgan, Sean P. S. Gulick, et al., Nature Geoscience
M Abull 132 9 10 CoverNew Insights into the Formation and Emplacement of Impact Melt Rocks within the Chicxulub Impact Structure, following the 2016 IODP-ICDP Expedition 364
Sietze J. de Graaff, Pim Kaskes, Thomas Déhais, Steven Goderis, Vinciane Debaille, Catherine H. Ross, Sean P. S. Gulick, et al., Geological Society of America Bulletin
CPSH: #0016
Journal Cover 2A Mini-Neptune and a Venus-Zone Planet in the Radius Valley Orbiting the Nearby M2-dwarf TOI-1266: Validation with the Habitable-zone Planet Finder
Gudmundur Stefansson, Ravi Kopparapu, Andrea Lin, et al., Astronomical Journal
CPSH: #0017
Journal CoverThe Mega-MUSCLES Spectral Energy Distribution of TRAPPIST-1
David Wilson, Cynthia S. Froning, Girish Duvvuri, et al., Astrophysical Journal
Marine GeologyWinding down the Chicxulub impact: the transition between impact and normal marine sedimentation near ground zero
Michael T. Whalen, Sean Gulick, Chris Lowery, Timothy J. Bralower, et al., Marine Geology
CPSH: #0019
AGU AdvancesThe habitat of the nascent Chicxulub crater
Timothy J. Bralower, Julie Cosmidis, Matthew S. Fantle, Chris Lowery, Benjamin H. Passey, Sean Gulick, et al., AGU Advances
CPSH: #0018
An expanded sedimentary section provides an opportunity to elucidate conditions in the nascent Chicxulub crater during the hours to millennia after the Cretaceous‐Paleogene (K‐Pg) boundary impact. The sediments were deposited…
Aa Poster Part1Precise mass and radius of a transiting super-Earth planet orbiting the M dwarf TOI-1235: a planet in the radius gap?
Paz Bluhm, Rafael Luque, Nestor Espinoza, Enric Palle, Jose A. Caballero, William D. Cochran, et al., Astronomy & Astrophysics
CPSH: #0002
We report the confirmation of a transiting planet around the bright weakly active M0.5 V star TOI-1235 (TYC 4384–1735–1, V ≈ 11.5 mag), whose transit signal was detected in the photometric time series of sectors 14, 20, and 21 of the TESS space mission. We confirm the planetary nature of the transit signal…
EpslOrigin of a global carbonate layer deposited in the aftermath of the Cretaceous-Paleogene boundary impact
Timothy Bralower, Julie Cosmidis, Peter Heaney, Lee Kump, Joanna Morgan, Dustin Harper, Shelby Lyons, Katherine Freeman, Kliti Grice, Jens Wendler, James Zachos, Natalia Artemieva, Anguo Chen, Sean Gulick, Christopher House, Heather Jones, Christopher Lowery, Christine Nims, Bettina Schaefer, Ellen Thomas, Vivi Vadja, Earth and Planetary Science Letters
CPSH: #0009
Microcrystalline calcite (micrite) dominates the sedimentary record of the aftermath of the Cretaceous–Paleogene (K–Pg) impact at 31 sites globally, with records ranging from the deep ocean to the Chicxulub impact crater, over intervals ranging from a few centimeters to more than seventeen meters. This micrite-rich layer provides important information about…
Ghbi20Myriapod divergence times differ between molecular clock and fossil evidence: U/Pb zircon ages of the earliest fossil millipede-bearing sediments
Michael E. Brookfield, Elizabeth J. Catlos, and Stephanie E. Suarez, Historical Biology
Molecular clock calculations suggest a late Cambrian (~ 500 Ma) divergence of myriapod classes. Yet, the earliest myriapods only appear in the latest Silurian (~425 Ma). 75 million years later; though correlation with the standard marine-based geological time scale is difficult. We radiometrically dated (U/Pb method) zircons…
Journal Cover 2A warm Jupiter transiting an M dwarf: A TESS single transit event confirmed with the Habitable-zone Planet Finder
Caleb I. Canas, Gudmundur Stefansson, Shubham Kanodia, Suvrath Mahadevan, William D. Cochran, Michael Endl, Paul Robertson, et al., Astronomical Journal
CPSH: #0004
We confirm the planetary nature of a warm Jupiter transiting the early M dwarf TOI-1899 using a combination of available TESS photometry; high-precision, near-infrared spectroscopy with the Habitable-zone Planet Finder; and speckle and adaptive optics imaging. The data reveal
6 Nature Communications CoverA steeply-inclined trajectory for the Chicxulub impact
Gareth S. Collins, Neel Patel, Thomas M. Davison, Auriol S. P. Rae, Joanna V. Morgan, Sean P. S. Gulick, and the IODP-ICDP Expedition 364 Scientists, Nature Communications
The environmental severity of large impacts on Earth is influenced by their impact trajectory. Impact direction and angle to the target plane affect the volume and depth of origin of vaporized target, as well as the trajectories of ejected material. The asteroid impact that formed…
M CoverThe TOI-763 system: sub-Neptunes orbiting a Sun-like star
Malcolm Fridlund, John Livingston, Davide Gandolfi, Carina M. Persson, Kristine W. F. Lam, Keivan G. Stassun, Coel Hellier, Judith Korth, Artie P. Hatzes, Luca Malavolta, Rafael Luque, Seth Redfield, Eike W. Guenther, Simon Albrecht, Oscar Barragán, Serena Benatti, Luke Bouma, Juan Cabrera, William D. Cochran, Szilard Csizmadia, Fei Dai, Hans J. Deeg, Massimiliano Esposito, Iskra Georgieva, Sascha Grziwa, Lucía González-Cuesta, Teruyuki Hirano, Jon M. Jenkins, Petr Kabath, Emil Knudstrup, David W. Latham, Savita Mathur, Susan E. Mullally, Norio Narita, Grzegorz Nowak, A. O. Hans Olofsson, Enric Palle, Martin Pätzold, Emanuela Pompei, Heike Rauer, George Ricker, Florian Rodler, Sara Seager, Luisa Maria Serrano, Alexis M. S. Smith, Lorenzo Spina, Jano Subjak, Peter Tenenbaum, Eric B. Ting, Andrew Vanderburg, Roland Vanderspek, Vincent Van Eylen, Steven Villanueva, Johua N. Winn, Monthly Notices of the Royal Astronomical Society
CPSH #0014
We report the discovery of a planetary system orbiting TOI-763(aka CD-39 7945), a V = 10.2, high proper motion G-type dwarf star that was photometrically monitored by the TESS space mission in Sector 10. We obtain and model the stellar spectrum and find an object slightly smaller than the Sun, and somewhat older, but with…
Journal CoverAluminum-26 Enrichment in the Surface of Protostellar Disks Due to Protostellar Cosmic Rays
Brandt A. L. Gaches, Stefanie Walch, Stella S. R. Walch, Carsten Münker, Astrophysical Journal
CPSH: #0008
The radioactive decay of aluminum-26 (26Al) is an important heating source in early planet formation. Since its discovery, there have been several mechanisms proposed to introduce 26Al into protoplanetary disks, primarily through contamination by external sources. We propose a local mechanism
GrlThe Carbonate Geochemistry of Enceladus’ Ocean
Christopher R. Glein and J. Hunter Waite, Geophysical Research Letters
The plume composition at Enceladus contains clues about conditions and processes in the interior. We present new geochemical interpretations of Cassini mass spectrometry data from the plume gas and salt‐rich ice grains. It is found that self‐consistency between the data sets can be achieved with…
M Gselements 2020 16 Issue 1 CoverHydrogen, Hydrocarbons, and Habitability Across the Solar System
Christopher R. Glein and Mikhail Yu Zolotov, Elements
The ingredients to make an environment habitable (e.g., liquid water, chemical disequilibria, and organic molecules) are found throughout the solar system. Liquid water has existed transiently on some bodies and persistently as oceans on others. Molecular hydrogen occurs in a plume on Saturn’s moon Enceladus. It can drive the reduction of CO2 to release energy. Methane has been observed…
Journal CoverPrecision mass and radius measurement of TOI-1728b: A warm super Neptune around an M0 dwarf host
Shubham Kanodia, Caleb I. Canas, Gudmundur Stefansson, Joe P. Ninan, Leslie Hebb, Andrea S.J. Lin, Helen Baran, Marissa Maney, Ryan C. Terrien, Suvrath Mahadevan, William D. Cochran, Michael Endl, Jiayin Dong, Chad F. Bender, Scott A. Diddams, Eric B. Ford, Connor Fredrick, Samuel Halverson, Fred Hearty, Andrew J. Metcalf, Andrew Monson, Lawrence W. Ramsey, Paul Robertson, Arpita Roy, Christian Schwab, Jason T. Wright, Astrophysical Journal
CPSH #0012
We confirm the planetary nature of TOI-1728b using a combination of ground-based photometry, near-infrared Doppler velocimetry and spectroscopy with the Habitable-zone Planet Finder. TOI-1728 is an old, inactive M0 star with T eff = ${3980}_{-32}^{+31}$ K, which hosts a transiting super-Neptune at an orbital period of ~3.49 days. Joint fitting of the radial velocities and TESS and ground-based transits yields…
IndexProbing the hydrothermal system of the Chicxulub Crater and its potential as a deep Earth habitat
David A. Kring, Sonia M. Tikoo, Martin Schmieder, Ulrich Riller, Mario Rebolledo-Vieyra, Sarah L. Simpson, Gordon R. Osinski, William Zylberman, et al., Science Advances
The ~180-km-diameter Chicxulub peak-ring crater and ~240-km multiring basin, produced by the impact that terminated the Cretaceous, is the largest remaining intact impact basin on Earth. International Ocean Discovery Program (IODP) and International Continental Scientific Drilling Program (ICDP) Expedition 364 drilled to a depth of 1335 m below the sea floor…
Mnras CoverK2-280 b – a low density warm sub-Saturn around a mildly evolved star
Grzegorz Nowak, Enric Palle, Davide Gandolfi, Hans J. Deeg, Teruyuki Hirano, Oscar Barragán, Masayuki Kuzuhara, Fei Dai, Rafael Luque, Carina M. Persson, Malcolm Fridlund, Marshall C. Johnson, Judith Korth, John H. Livingston, Sascha Grziwa, Savita Mathur, Artie P. Hatzes, Jorge Prieto-Arranz, David Nespral, Diego Hidalgo, Maria Hjorth, Simon Albrecht, Vincent Van Eylen, Kristine W. F. Lam, William D. Cochran, Massimiliano Esposito, Szilárd Csizmadia, Eike W. Guenther, Petr Kabath, Pere Blay, Rafael Brahm, Andrés Jordán, Néstor Espinoza, Felipe Rojas, Núria Casasayas Barris, Florian Rodler, Roi Alonso Sobrino, Juan Cabrera, Ilaria Carleo, Alexander Chaushev, Jerome de Leon, Philipp Eigmüller, Michael Endl, Anders Erikson, Akihiko Fukui, Iskra Georgieva, Lucía González-Cuesta, Emil Knudstrup, Mikkel N. Lund, Pilar Montañes Rodríguez, Felipe Murgas, Norio Narita, Prajwal Niraula, Martin Pätzold, Heike Rauer, Seth Redfield, Ignasi Ribas, Marek Skarka, Alexis M. S. Smith, Jano Subjak, Monthly Notices of the Royal Astronomical Society
CPSH #0010
We present an independent discovery and detailed characterisation of K2-280 b, a transiting low density warm sub-Saturn in a 19.9-day moderately eccentric orbit…
AminoacidsIntramolecular distribution of 13C/12C isotopes in amino acids of diverse origins
Cornelia Rasmussen & David W. Hoffman, Amino Acids
CPSH: #0007
Carbon stable isotope analysis can provide information about the origin and synthetic pathways that produce organic molecules, with applications in chemical, medical and (bio)geochemical sciences. The 13C/12C isotope ratios of organics such as amino acids are most commonly obtained as whole molecule averages. In this study, we apply proton nuclear magnetic resonance spectroscopy
X00167037Spatial U-Pb age distribution in shock-recrystallized zircon – A case study from the Rochechouart impact structure, France
Cornelia Rasmussen, Daniel F. Stockli, Timmons M. Erickson, and Martin Schmieder, Geochimica et Cosmochimica Acta
Age determination of impact structures via the zircon U-Pb system remains challenging and often ambiguous due to highly variable effects of shock metamorphism on U-Pb geochronology. It is, therefore, crucial to link the observed zircon microtextures…
Chemical GeologyU-Pb memory behavior in Chicxulub’s peak ring — Applying U-Pb depth profiling to shocked zircon
Cornelia Rasmussen, Daniel F. Stockli, Catherine H. Ross, Annemarie Pickersgill, Sean P. Gulick, Martin Schmieder, Gail L. Christeson, Axel Wittmann, David A. Kring, Joanna V. Morgan, and the IODP-ICDP Expedition 364 Scientists, Chemical Geology
The zircon U-Pb system is one of the most robust geochronometers, but during an impact event individual crystals can be affected differently by the passage of the shock wave and impact generated heat. Unraveling the potentially complex thermal history recorded by zircon crystals
Journal CoverPersistent starspot signals on M dwarfs: multi-wavelength Doppler observations with the Habitable-zone Planet Finder and Keck/HIRES
Paul Robertson, Gudmundur Stefansson, Suvrath Mahadevan, Michael Endl, William D. Cochran, Corey Beard, Chad F. Bender, Astrophysical Journal
CPSH: #0003
Young, rapidly rotating M dwarfs exhibit prominent starspots, which create quasiperiodic signals in their photometric and Doppler spectroscopic measurements. The periodic Doppler signals can mimic radial velocity (RV) changes expected from orbiting exoplanets. Exoplanets can be distinguished from activity-induced false positives by
M Geology 48 6 CoverRapid macrobenthic diversification and stabilization after the end-Cretaceous mass extinction event
Francisco J. Rodriguez-Tovar, Christopher M. Lowery, Timothy J. Bralower, Sean P. S. Gulick, and Heather L. Jones, Geology
CPSH: #0006
Previous ichnological analysis at the Chicxulub impact crater, Yucatán Peninsula, México (International Ocean Discovery Program [IODP]/International Continental Scientific Drilling Program [ICDP] Site M0077), showed a surprisingly rapid initial tracemaker community recovery after the end-Cretaceous…
Graphic Cp Cover HomepageLife and death in the Chicxulub impact crater: a record of the Paleocene–Eocene Thermal Maximum
Vann Smith, Sophie Warny, Kliti Grice, Bettina Schaefer, Michael T. Whalen, Johan Vellekoop, Elise Chenot, Sean P. S. Gulick, Ignacio Arenilla, Jose A. Arz, Thorsten Bauersachs, Timothy Bralower, François Demory, Jerôme Gattacceca, Heather Jones, Johanna Lofi, Christopher M. Lowery, Joanna Morgan, Noelia B. Nuñez Otaño, Jennifer M. K. O’Keefe, Katherine O’Malley, Francisco J. Rodríguez-Tovar, Lorenz Schwark, and the IODP-ICDP Expedition 364 Scientists, Climate of the Past
CPSH: #0013
Thermal stress on the biosphere during the extreme warmth of the Paleocene–Eocene Thermal Maximum (PETM) was most severe at low latitudes, with sea surface temperatures at some localities exceeding the 35 ∘C at which marine organisms experience heat stress. Relatively few equivalent terrestrial sections have been identified, and the response of land plants…
Journal Cover 2The Habitable Zone Planet Finder Reveals a High Mass and a Low Obliquity for the Young Neptune K2-25b
Gudmundur Stefansson, Suvrath Mahadevan, Marissa Maney, Joe P. Ninan, Paul Robertson, Jayadev Rajagopal, William Cochran, et al., Astronomical Journal
CPSH: #0001
Using radial velocity data from the Habitable Zone Planet Finder, we have measured the mass of the Neptune-sized planet K2-25b, as well as the obliquity of its M4.5 dwarf host star in the 600–800 Myr Hyades cluster. This is one of the youngest planetary systems for which both of these quantities have been measured and one of the very few
M Geology 48 8 CoverPrecipitation and aridity constraints from paleolakes on early Mars
Gaia Stucky de Quay, Timothy A. Goudge, Caleb I. Fassett, Geology
CPSH #0011
The ancient climate of Mars remains an enigma despite the abundance of in situ and remote-sensing data revealing hydrological activity in the past. The crux of this debate — informed by geomorphic studies, chemical alteration observations, and numerical climate models — is the…
X00167037Shocked titanite records Chicxulub hydrothermal alteration and impact age
Nicholas E. Timms, Christopher L. Kirkland, Aaron J. Cavosie, Auriol S. P. Rae, William D. A. Rickard, Noreen J. Evans, Timmons M. Erickson, Axel Wittmann, Ludovic Ferriere, Gareth S. Collins, and Sean P. S. Gulick, Geochimica et Cosmochimica Acta
CPSH: #0005
Hydrothermal activity is a common phenomenon in the wake of impact events, yet identifying and dating impact hydrothermal systems can be challenging. This study provides the first detailed assessment of the effects of shock microstructures and impact-related alteration…
Space PolicyThe Search for Extraterrestrial Intelligence: A Realpolitik Consideration
Kenneth W. Wisian and John W. Traphagan, Space Policy
In the vigorous academic debate over the risks of the Search for ExtraTerrestrial Intelligence (SETI) and active Messaging ExtraTerrestrial Intelligence (ETI) (METI), a significant factor has been largely overlooked. Specifically, the risk of merely detecting an alien signal from passive SETI activity is usually…
IcarusTesting the deltaic origin of fan deposits at Bradbury Crater, Mars
Michael S. Bramble, Timothy A. Goudge, Ralph E. Milliken, and John F. Mustard, Icarus
The stratigraphic architectures of three fan-shaped deposits at Bradbury crater, Mars were investigated to test the hypothesis that the deposits were formed in standing bodies of water. Quantitative stratigraphic methods were applied
1.cover SourceTime will tell: temporal evolution of Martian gullies and palaeoclimatic implications
Tjalling de Haas, Susan J. Conway, Frances E. G. Butcher, Joseph Levy, Peter M. Grindrod, Timothy A. Goudge, and Matthew R. Balme, Geological Society of London
To understand Martian palaeoclimatic conditions and the role of volatiles therein, the spatiotemporal evolution of gullies must be deciphered. While the spatial distribution of gullies has been extensively studied, their temporal evolution is poorly understood. We show that gully size is similar…
IndexoldThe Future of Reef Ecosystems in the Gulf of Mexico: Insights From Coupled Climate Model Simulations and Ancient Hot-House Reefs
Sylvia G. Dee, Mark A. Torres, Rowan C. Martindale, Anna Weiss, and Kristine L. DeLong, Frontiers in Marine Science
Shallow water coral reefs and deep sea coral communities are sensitive to current and future environmental stresses, such as changes in sea surface temperatures (SST), salinity, carbonate chemistry, and acidity. Over the last half-century, some reef communities have been disappearing at an alarming pace. This study focuses on the Gulf of Mexico, where the majority of shallow coral reefs are reported to be
IndexworsResilience of marine invertebrate communities during the early Cenozoic hyperthermals
William J. Foster, Christopher L. Garvie, Anna M. Weiss, A. Drew Muscente, Martin Aberhan, John W. Counts, and Rowan C. Martindale, Scientific Reports
The hyperthermal events of the Cenozoic, including the Paleocene-Eocene Thermal Maximum, provide an opportunity to investigate the potential effects of climate warming on marine ecosystems. Here, we examine the shallow benthic marine communities preserved in the late Cretaceous…
Dep2.v6.1.coverSuppressed competitive exclusion enabled the proliferation of Permian/Triassic boundary microbialites
William J. Foster, Katrin Heindel, Sylvain Richoz, Jana Gliwa, Daniel J. Lehrmann, Aymon Baud, Tea Kolar‐Jurkovsek, Dunja Aljinovic, Bogdan Jurkovsek, Dieter Korn, Rowan C. Martindale, and Jorn Peckmann, The Depositional Record
During the earliest Triassic microbial mats flourished in the photic zones of marginal seas, generating widespread microbialites. It has been suggested that anoxic conditions in shallow marine environments, linked to the end‐Permian mass extinction, limited mat‐inhibiting metazoans allowing for this microbialite expansion. The presence of a diverse
Journal CoveA Hot Ultraviolet Flare on the M Dwarf Star GJ 674
Cynthia S. Froning, Adam Kowalski, Kevin France, R. O. Parke Loyd, P. Christian Schneider, Allison Youngblood, David Wilson, Alexander Brown, Zachory Berta-Thompson, J. Sebastian Pineda, Jeffrey Linsky, Sarah Rugheimer, and Yamila Miguel, Astrophysical Journal Letters
As part of the Mega-Measurements of the Ultraviolet Spectral Characteristics of Low-Mass Exoplanetary Systems Hubble Space Telescope (HST) Treasury program, we obtained time-series ultraviolet spectroscopy of the M2.5V star, GJ 674. During the far-ultraviolet (FUV) monitoring observations, the target exhibited several small flares and one large flare (E FUV = 1030.75 erg) that persisted over the entirety…
1 S2.0 S0019103518x0013x Cov150hDeltaic deposits indicative of a paleo-coastline at Aeolis Dorsa, Mars
Cory M. Hughes, Benjamin T. Cardenas, Timothy A. Goudge, and David Mohrig, Icarus
Recent work at Aeolis Dorsa, Mars has identified exposure of fluvial sedimentary outcrop deposited early in martian history, likely during the late Hesperian or earlier. Here, we examine a ∼1200 km2 exposure of sedimentary outcrop in southeast Aeolis Dorsa. Total thickness of the stratigraphic section exceeds 100 m. We identify eight discrete complexes…
39.cover SourceThe first day of the Cenozoic
Sean P. S. Gulick, Timothy J. Bralower, Jens Ormö, Brendon Hall, Kliti Grice, Bettina Schaefer, Shelby Lyons, Katherine H. Freeman, Joanna V. Morgan, Natalia Artemieva, Pim Kaskes, Sietze J. de Graaff, Michael T. Whalen, Gareth S. Collins, Sonia M. Tikoo, Christina Verhagen, Gail L. Christeson, Philippe Claeys, Marco J. L. Coolen, Steven Goderis, Kazuhisa Goto, Richard A. F. Grieve, Naoma McCall, Gordon R. Osinski, Auriol S. P. Rae, Ulrich Riller, Jan Smit, Vivi Vajda, Axel Wittmann, and the IODP-ICDP Expedition 364 Scientists, Proceeding of the National Academy of Sciences
Highly expanded Cretaceous–Paleogene (K-Pg) boundary section from the Chicxulub peak ring, recovered by International Ocean Discovery Program (IODP)–International Continental Scientific Drilling Program (ICDP) Expedition 364, provides an unprecedented window into the immediate aftermath of the impact. Site M0077 includes ∼130 m of impact melt rock and suevite deposited the first day of the Cenozoic covered by <1 m of micrite-rich carbonate deposited over subsequent weeks to years. We present an interpreted series of events…
32 1Ocean Drilling Perspectives on Meteorite Impacts
Christopher M. Lowery, Joanna V. Morgan, Sean P. S. Gulick, Timothy J. Bralower, Gail L. Christeson, and the IODP-ICDP Expedition 364 Scientists, Oceanography
Extraterrestrial impacts that reshape the surfaces of rocky bodies are ubiquitous in the solar system. On early Earth, impact structures may have nurtured the evolution of life. More recently, a large meteorite impact off the Yucatán Peninsula in Mexico at the end of the Cretaceous caused the disappearance of 75% of species known from the fossil record, including non-avian dinosaurs…
IndexThe survival, recovery, and diversification of metazoan reef ecosystems following the end-Permian mass extinction event
Rowan C. Martindale, William J. Foster, and Felicitasz Velledits, Palaeogeography, Palaeoclimatology, Palaeoecology
The Triassic Period records important ecological transitions in the aftermath of the end-Permian mass extinction and is a key interval in the evolution of modern coral reefs. There have been several critical developments in our understanding of Triassic reef evolution over the past decade: the timing of events and duration…
Journal CoverContributions from Accreted Organics to Titan’s Atmosphere: New Insights from Cometary and Chondritic Data
Kelly E. Miller, Christopher R. Glein, and J. Hunter Waite Jr., Astrophysical Journal
Since its discovery in the first half of the 20th century, scientists have puzzled over the origins of Titan’s atmosphere. Current models suggest that atmospheric N2 on Titan may have originated from NH3-bearing ice with N-isotopic ratios similar to those observed in NH2 in cometary comae (14N/15N ~ 136). In contrast, N2 ice appears to be too 15N poor to explain Titan’s atmosphere…
M Geology 48 2 CoverExplosive interaction of impact melt and seawater following the Chicxulub impact event
Gordon R. Osinski, Richard A. F. Grieve, Patrick J. A. Hill, Sarah L. Simpson, Charles Cockell, Gail L. Christeson, Matthias Ebert, Sean Gulick, H. Jay Melosh, Ulrich Riller, Sonia M. Tikoo, and Axel Wittmann, Geology
The impact of asteroids and comets with planetary surfaces is one of the most catastrophic, yet ubiquitous, geological processes in the solar system. The Chicxulub impact event, which has been linked to the Cretaceous-Paleogene (K-Pg) mass extinction marking the beginning of the Cenozoic Era, is arguably the most significant singular geological event in the past 100 million years…
Jgre.v124.7.coverImpact‐Induced Porosity and Microfracturing at the Chicxulub Impact Structure
Auriol S. P. Rae, Gareth S. Collins, Joanna V. Morgan, Tobias Salge, Gail L. Christeson, Jody Leung, Johanna Lofi, Sean P. S. Gulick, Michael Poelchau, Ulrich Riller, Catalina Gebhardt, Richard A. F. Grieve, Gordon R. Osinski and the IODP-ICDP Expedition 364 Scientists, Journal of Geophysical Research: Planets
Porosity and its distribution in impact craters has an important effect on the petrophysical properties of impactites: seismic wave speeds and reflectivity, rock permeability, strength, and density. These properties are important for the identification of potential craters and…
M Geology 48 4 CoverMicrobial life in the nascent Chicxulub crater
Bettina Schaefer, Kliti Grice, Marco J. L. Coolen, Roger E. Summons, Xingqian Cui, Thorsten Bauersachs, Lorenz Schwark, Michael E. Böttcher, Timothy J. Bralowe, Shelby L. Lyons, Katherine H. Freeman, Charles S. Cockell, Sean P. S. Gulick, Joanna V. Morgan, Michael T. Whalen, Christopher M. Lowery, and Vivi Vajda, Geology
The Chicxulub crater was formed by an asteroid impact at ca. 66 Ma. The impact is considered to have contributed to the end-Cretaceous mass extinction and reduced productivity in the world’s oceans due to a transient cessation of photosynthesis. Here, biomarker profiles extracted from crater core material reveal…
JgreHigh‐Resolution Thermal Environment of Recurring Slope Lineae in Palikir Crater, Mars, and Its Implications for Volatiles
Norbert Schorghofer, Joseph S. Levy, and Timothy A. Goudge, Journal of Geophysical Research: Planets
A thermophysical model for rough terrain is developed that is capable of processing spatial domains of megapixel size. This computational advance makes it possible to characterize thermal environments on Mars at unprecedented scale and at a resolution of 1 m per pixel. The model is applied to Palikir Crater, Mars, where…
UntitledA U-Pb zircon age constraint on the oldest-recorded air-breathing land animal
Stephanie E. Suarez, Michael E. Brookfield, Elizabeth J. Catlos, and Daniel F. Stockli, PLoS One
The oldest-known air-breathing land animal is the millipede Pneumodesmus newmani, found in the Cowie Harbour Fish Bed at Stonehaven, Scotland. Here we report the youngest, most concordant 238U-206Pb zircon age from ash below the fish bed of 413.7±4.4 Ma (±2σ), whereas the youngest age from a tuffaceous sandstone…
GrlOrbital Identification of Hydrated Silica in Jezero Crater, Mars
Jesse D. Tarnas, John F. Mustard, Honglei Lin, Timothy A. Goudge, Elena S. Amador, Michael S. Bramble, Christopher H. Kremer, Xiaomin Zhang, Yuki Itoh, and Mario Parente, Geophysical Research Letters
Silica has the highest demonstrated potential of any phase to preserve microfossils on Earth and therefore may host potential biosignatures on Mars. We detected hydrated silica in Jezero crater, the landing site of the National Aeronautics and Space Administration’s Mars 2020 rover mission, by applying Dynamic Aperture Factor Analysis/Target Transformation to images from…
1 S2.0 S0019103519x00184 Cov150Slope, elevation, and thermal inertia trends of martian recurring slope lineae initiation and termination points: Multiple possible processes occurring on coarse, sandy slopes
Michelle Tebolt, Joseph Levy, Timothy Goudge, and Norbert Schorghofer, Icarus
Recurring slope lineae (RSL) are dark linear features on the surface of Mars that advance incrementally downslope, fading and re-growing annually. Numerous hypotheses have been proposed to explain RSL formation, including “wet” models that involve liquid water orbrines and “dry” mechanisms involving…
1 S2.0 S0019103519x00081 Cov150hDecomposition of amino acids in water with application to in-situ measurements of Enceladus, Europa and other hydrothermally active icy ocean worlds
Ngoc Truong, Adam A. Monroe, Christopher R. Glein, Ariel D. Anbar, and Jonathan I. Lunine, Icarus
To test the potential of using amino acid abundances as a biosignature at icy ocean worlds, we investigate whether primordial amino acids (accreted or formed by early aqueous processes) could persist until the present time. By examining the decomposition kinetics of amino acids in aqueous solution based on existing laboratory rate data, we find…
PaloPaleobiological Traits That Determined Scleractinian Coral Survival and Proliferation During the Late Paleocene and Early Eocene Hyperthermals
Anna M. Weiss and Rowan C. Martindale, Paleoceanography and Paleoclimatology
Coral reefs are particularly sensitive to environmental disturbances, such as rapid shifts in temperature or carbonate saturation. Work on modern reefs has suggested that some corals will fare better than others in times of stress and that their life history traits might correlate with species survival. These same traits can be applied to fossil taxa to assess…