Article
Environmental Sciences
Jinzhao Liu
Summary: The study showed that δ H-2(wax) values can be reliably used as a proxy for reconstructing paleoelevation in arid conditions. However, it will be necessary to identify other proxies to supplement δ H-2(wax) values under a dual-isotope approach in future research.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Geography, Physical
Tianjie Jin, Laiming Zhang, Katharine W. Huntington, Yixiong Wen, Andrew J. Schauer, Xue Gu, Chengshan Wang
Summary: The modern elevation of China varies from the Tibetan plateau in the west to sea level in the east, with several topographic steps. This study investigates the paleoenvironmental and paleoelevation changes in North China during the late Mesozoic using delta O-18, delta C-13, and clumped isotope values of paleosol carbonates. The results suggest that the Ordos Basin in western North China maintained a high paleoelevation during the Middle Jurassic-late Early Cretaceous, while the Hefei Basin in eastern North China experienced a significant elevation reduction by the Early Cretaceous. These findings indicate a topographic change that may have influenced paleoclimate patterns and caused a transition from dry to humid climate in eastern North China.
GLOBAL AND PLANETARY CHANGE
(2023)
Article
Environmental Sciences
Jinzhao Liu, Zhisheng An, Guanghui Lin
Summary: Recent studies have shown heterogeneity of leaf wax n-alkane delta H-2 values within leaves of certain plant species. This heterogeneity varies spatially and temporally, with consistent findings of base-to-tip enrichment in monocots and base-to-tip and center-to-edge increases in dicots. The intra-leaf delta H-2(wax) heterogeneity is likely inherited from spatial patterns of delta H-2(lw) associated with veinal structures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Geosciences, Multidisciplinary
Jinzhao Liu, Zhisheng An
Summary: This study demonstrates the reliability of using leaf wax n-alkane delta D values as a proxy for paleoelevation reconstruction on a global scale. The global delta Dn-alkane-altitude lapse rates provide an alternative method to reconstruct paleoelevation in uninvestigated areas.
SCIENCE CHINA-EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Jade Z. Zhang, Sierra V. Petersen
Summary: Geochemical signatures preserved in the geological record can be used to reconstruct past mean temperature and seasonality. A study was conducted to assess the ability of multiple isotope techniques in recording temperature variations in the bivalve Lucina pensylvanica. Comparisons were made between different thermometry methods to determine the most accurate approach for fossil shell analysis. The findings suggest that averaging seasonally-targeted Delta(47)-temperatures best match mean annual temperature, while averaging delta O-18(carb)-based temperatures from different seasons accurately represents seasonality.
Article
Geography, Physical
Xiumei Li, Sutao Liu, Baowei Fan, Juzhi Hou, Mingda Wang
Summary: Paleoelevation reconstructions of the Himalayan mountains and Tibetan Plateau can improve our understanding of climate, biodiversity, and ecosystems. This study analyzes plant leaf wax delta 2H and brGDGTs-derived indices in soil along an elevation transect to verify their reliability for paleoelevation reconstructions. The coupled delta 2Hwax-MBT ' 5ME proxy shows greater potential for paleoelevation estimates.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
A. J. Davies, W. Guo, M. Bernecker, M. Tagliavento, J. Raddatz, E. Gischler, S. Floegel, J. Fiebig
Summary: Dual clumped isotope thermometry of coral carbonate can accurately reconstruct paleotemperatures and may require different corrections for cold-water and warm-water corals.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Multidisciplinary Sciences
Getachew Agmuas Adnew, Magdalena E. G. Hofmann, Thijs L. Pons, Gerbrand Koren, Martin Ziegler, Lucas J. Lourens, Thomas Rockmann
Summary: The study quantified the effect of photosynthetic gas exchange on Delta (47) of CO2 using leaf cuvette experiments, demonstrating the various factors affecting the clumped isotope composition of CO2, particularly the role of gas exchange in influencing the Delta (47) value of CO2.
SCIENTIFIC REPORTS
(2021)
Article
Geology
Alexandra S. Robinson, Annabel Dale, Thierry Adatte, Cedric M. John
Summary: The Cenozoic unconformity above the Late Cretaceous carbonates in the Maverick Basin, Texas, is a unique geological feature. Two hypotheses have been proposed to explain this unconformity, and clumped isotope data and organic maturation proxies were used to investigate the thermal history of the area.
Article
Geochemistry & Geophysics
Xavier Mangenot, Hao Xie, Antoine Cremiere, Thomas Giunta, Marvin Lilley, Olivier Sissmann, Victoria Orphan, Arndt Schimmelmann, Eric C. Gaucher, Jean-Pierre Girard, John Eiler
Summary: We present a method for measuring the clumped isotope composition of molecular hydrogen (H2) using a high-resolution mass spectrometer and optimized techniques for sample purification and concentration. The accuracy of the method is validated through comparisons with established methods and measurements of H2 gases at isotopic equilibrium. The study also investigates gas purification methods and demonstrates negligible changes in clumped isotope composition. Furthermore, the method is applied to natural geological samples, revealing the potential of clumped isotope composition in tracking temperatures and biogeochemical processes related to H2.
Article
Plant Sciences
Pernell Tomasi, Hussein Abdel-Haleem
Summary: Brassica carinata is a renewable biofuel crop with high oil and polyunsaturated fatty acids contents. This study explores the variations in cuticular wax content and composition in B. carinata, revealing a wide range of wax content and various classes of wax. The study also suggests that modifying specific wax content can increase the overall wax content and enhance the composition of the cuticle. This research provides valuable insight into wax biosynthetic pathways and the development of drought-tolerant cultivars of B. carinata.
Article
Geochemistry & Geophysics
K. Prasanna, Prosenjit Ghosh, Robert A. Eagle, Aradhna Tripati, Vivesh V. Kapur, Richard F. Feeney, Benjamin R. Fosu, Divya Mishra
Summary: Carbonate clumped isotope thermometry provides a method to estimate water temperature independently of the δO-18 value, and the new calibration technique presented in this study shows promising results in accurately determining environmental conditions in modern and ancient settings. The study suggests that the δO-18 values in fish otoliths reflect kinetic effects and environmental conditions, with potential diagenesis effects also taken into consideration.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geography, Physical
Xiaolong Zhang, Baiqing Xu, Franziska Guenther, Gerd Gleixner
Summary: By conducting isotopic analyses of two plant species in the southeastern Tibetan Plateau, it was found that the isotopic variations in plants are related to precipitation, with potential time lags in different plant species. Climate variables play a significant role in driving plant isotopic variations, providing important implications for paleoclimate reconstructions in global monsoonal regions.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geochemistry & Geophysics
Max K. Lloyd, Daniel L. Eldridge, Daniel A. Stolper
Summary: Methyl groups are commonly found in various materials and can be used as tracers in biogeochemical cycles and as indicators of past environmental conditions. This study introduces new variables for studying methyl groups, including the analysis of C-13-D and D-D clumped isotope compositions. The differences in clumped isotope compositions between commercial monomers and wood suggest that methyl groups may be useful in identifying sources and sinks of methyl groups in the environment.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Zeyang Sun, Saul Perez-Beltran, Wasif Zaheer, William F. Defliese, Sarbajit Banerjee, Ethan L. Grossman
Summary: The Delta(47) signatures of carbonates are susceptible to resetting at elevated temperatures during burial, which affects the accuracy of temperature reconstruction. Experimental and simulation studies reveal the reordering rates of different carbonates and the factors influencing the reordering process, providing a basis for the development of a kinetic model.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Biographical-Item
Plant Sciences
Carlos Jaramillo, David M. Jarzen
Article
Plant Sciences
Bianca Tacoronte Gomes, Maria Lucia Absy, Carlos D'Apolito, Dayenari Caballero-Rodriguez, Camila Martinez, Carlos Jaramillo
Summary: The Neogene played a crucial role in shaping the modern geography and biotic composition of Amazonia. By studying Miocene paleoenvironments and paleoclimate in western Amazonia, researchers identified new species and confirmed a marine flooding event in the middle Miocene. The study also revealed that the average Miocene temperature and precipitation were not significantly different from Holocene estimates.
Article
Ecology
Christine D. Bacon, Natalia Gutierrez-Pinto, Suzette Flantua, Diego Castellanos Suarez, Carlos Jaramillo, R. Toby Pennington, Alexandre Antonelli
Summary: Utilizing DNA sequence data, this study delves into the evolutionary history of the genus Cavanillesia, with a focus on the endemic C. chicamochae in the Chicamocha Canyon of Colombia. The research reveals marked genetic differentiation within populations of C. chicamochae in the canyon, likely influenced by climate change and local landscape processes. The findings underscore the urgent need for conservation efforts to preserve the unique biodiversity in the region.
Article
Ecology
Natalia Hoyos, Alex Correa-Metrio, Carlos Jaramillo, Juan Camilo Villegas, Jaime Escobar
Summary: The transition between tropical savanna and humid forest is mainly influenced by the average duration of dry and wet spells and the interaction between these variables, with total monthly precipitation having a marginal effect. Dry spell duration has the largest effect on the probability of forest occurrence, decreasing by 7.5% for each additional consecutive dry day. Wet spell duration also impacts forest occurrence, increasing by 4.1% for each additional consecutive wet day.
GLOBAL ECOLOGY AND BIOGEOGRAPHY
(2022)
Article
Geosciences, Multidisciplinary
Nandini Kar, Lin Li, Victor Carlotto, Carmala N. Garzione, Federico Moreno, Sarah Smith
Summary: The Paleocene-Miocene sedimentary successions in southern Peru reveal the growth history of the northern Altiplano Plateau and foreland basin system. Through analyzing paleoelevation history, the study determines significant surface uplift during primary upper crustal shortening. New age models and calculations based on isotopic values suggest rapid surface uplift during late Miocene, potentially due to lower crustal flow and removal of lithosphere materials.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
S. Zapata, L. Calderon-Diaz, C. Jaramillo, F. Oboh-Ikuenobe, J. C. Piedrahita, M. Rodriguez-Cuevas, A. Cardona, E. R. Sobel, M. Parra, V. Valencia, A. Patino, J. S. Jaramillo-Rios, M. Flores, J. Glodny
Summary: A new dataset including detrital U-Pb zircon ages, sandstone petrography, and low-temperature thermochronology from the Southern Central Cordillera were used to construct a paleogeographical model of the Miocene hinterland and foreland regions in the Northern Andes.
Article
Paleontology
Laura Mora-Rojas, Andres Cardenas, Carlos Jaramillo, Daniele Silvestro, German Bayona, Sebastian Zapata, Federico Moreno, Cesar Silva, Jorge W. Moreno-Bernal, Juan Sebastian Jaramillo, Victor Valencia, Mauricio Ibanez
Summary: This study provides an overview of the middle Miocene Konzentrat-Lagerstatte of the La Venta site, which contains valuable information on the biotic response to climatic changes. By compiling published studies and using geological maps and geochronological data, the researchers have established a comprehensive understanding of the Neotropics terrestrial ecosystems during the Neogene. The findings highlight the importance of the La Venta site in understanding Miocene paleoecological dynamics in northern South America, yet further exploration is still needed.
Article
Geosciences, Multidisciplinary
Victor Carlotto, Gabriel Carlier, Pieter Van Heiningen, Eben Blake Hodgin, Jose Cardenas, Rolando Ligarda, Luis Cerpa, Vilma Maqquera
Summary: The reevaluation of Andean evolution in southern Peru, northern Bolivia, and northern Chile presents evidence for cyclical orogenic models in which the Andean crust underwent shortening, followed by lithospheric delamination during the Eocene-Oligocene period, leading to renewed uplift of the Andes. The sedimentary fill of the Arequipa rift back-arc basin was controlled by fault systems and crustal structures, which allowed for tectonic inversion and crustal doubling during the Albian and Late Cretaceous-Paleocene periods. The thickening of the Western Cordillera occurred along the inverted graben, driven by high-pressure metamorphism and delamination. Magmatism and asthenospheric upwelling resulted in lithospheric thinning and subsequent surface uplift, accompanied by the development of foreland basins and alkaline potassic magmatism.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Michele Andriolli Custodio, Martin Roddaz, Roberto Ventura Santos, Pierre-Olivier Antoine, Laurent Marivaux, Narla S. Stutz, Elton Luiz Dantas, Carlos Jaramillo, Melanie Louterbach, Christian Hurtado, Guilherme Oliveira Goncalves
Summary: This study investigates the paleoenvironments of Western Amazonia during the Paleogene through a multi-proxy approach. The results reveal the presence of lacustrine and tide-dominated depositional systems in the Hual-laga Basin, northern Peru. The biostratigraphic and U-Pb zircon dating suggest a hiatus in the depositional record during the Paleocene, and the carbon and oxygen stable isotope values indicate a transition from freshwater to brackish conditions. It is proposed that the Bartonian shallow marine incursion in the Huallaga Basin originated from the north through the Caribbean Sea and might have influenced regional biodiversity patterns in the Paleogene.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Review
Plant Sciences
Carlos Jaramillo
Summary: This review examines the development of South American tropical biomes, specifically their origins and timing. The transition from non-angiosperm dominance to full angiosperm dominance took place during the Cretaceous period. However, there are no existing equivalents to the Cretaceous biomes, as lowland forests lacked closed canopies and were mainly dominated by gymnosperms and ferns. The extant lowland tropical rainforests first emerged in the Cenozoic era with a multistratified forest, angiosperm-dominated closed canopy, and the dominance of major tropical plant families.
Article
Plant Sciences
Luke Mander, Carlos Jaramillo, Francisca Oboh-Ikuenobe
Summary: Fossil pollen and spores provide crucial information about the geological history of tropical vegetation. However, the large number of pollen and spore types encountered makes taxonomy and classification challenging. This study focuses on the Upper Paleocene-Lower Eocene sediments in southeastern Nigeria, describing a palynoflora consisting of 29 spores, two gymnosperm pollen grains, and 138 angiosperm pollen grains. The samples suggest an increase in diversity from the Paleocene to the Eocene in the region.
Article
Geosciences, Multidisciplinary
Xavier Delclos, Enrique Penalver, Eduardo Barron, David Peris, David A. Grimaldi, Michael Holz, Conrad C. Labandeira, Erin E. Saupe, Christopher R. Scotese, Monica M. Solorzano-Kraemer, Sergio Alvarez-Parra, Antonio Arillo, Dany Azar, Edwin A. Cadena, Jacopo Dal Corso, Jiri Kvacek, Antonio Monleon-Getino, Andre Nel, Daniel Peyrot, Carlos A. Bueno-Cebollada, Alejandro Gallardo, Beatriz Gonzalez-Fernandez, Marta Goula, Carlos Jaramillo, Iwona Kania-Klosok, Rafael Lopez-Del Valle, Rafael P. Lozano, Nieves Melendez, Cesar Menor-Salvan, Constanza Pena-Kairath, Vincent Perrichot, Ana Rodrigo, Alba Sanchez-Garcia, Maxime Santer, Victor Sarto i Monteys, Dieter Uhl, Jose Luis Viejo, Ricardo Perez-de la Fuente
Summary: Amber, fossilized resin, has revolutionized our understanding of past terrestrial organisms and habitats. Cretaceous amber outcrops are abundant in the Northern Hemisphere during a 54 million year interval. The extensive resin production during this time, attributed to coniferous trees and climatic dynamics, has led to a remarkable record of terrestrial life known as the 'Cretaceous Resinous Interval' (CREI).
EARTH-SCIENCE REVIEWS
(2023)
Article
Geology
Rafael Francisco Castano-Cardona, Carlos Jaramillo, Andres Pardo-Trujillo, Barbara Vento, Daniela Quiroz-Cabascango, Estefania Angulo-Pardo
Summary: Several Cretaceous amber-bearing localities have been recently discovered in Ecuador and Colombia. A palynological study was conducted to determine their age and assess the floral content. The findings reveal that these localities date back to the late Aptian to early Albian and late Aptian to early Cenomanian, indicating a humid climate in these regions.
BOLETIN DE GEOLOGIA
(2023)
Article
Biology
Aldo Benites-Palomino, Jorge Velez-Juarbe, Carlos De Gracia, Carlos Jaramillo
Summary: New fossil cetaceans from the Upper Miocene Chagres Formation in the Caribbean have been discovered in Eastern Panama. These fossils show similarities with Late Miocene cetacean communities in the Californias in the North Pacific and the Pisco Formation in Peru. This indicates that shallow water marine connection might have facilitated the dispersal of coastal species across both sides of the Isthmus, despite the reduction in deep and intermediate Caribbean-Pacific water interchange during the Middle Miocene.
Article
Geochemistry & Geophysics
Christoph Haggi, B. David A. Naafs, Daniele Silvestro, Dailson J. Bertassoli Jr, Thomas K. Akabane, Vinicius R. Mendes, Andre O. Sawakuchi, Cristiano M. Chiessi, Carlos A. Jaramillo, Sarah J. Feakins
Summary: This study surveys the distribution of brGDGT and isoGDGT in tropical South America and establishes new brGDGT-based temperature models. The results show variations in the distribution of these lipids in different soil types and profiles, and provide insights for paleoclimatic reconstructions.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)