Article
Geology
Megan E. Smith, Peter K. Swart
Summary: The global correlation of negative excursions in delta C-13 values can be used to interpret major environmental changes, but diagenetic processes can affect these correlations.
SEDIMENTARY GEOLOGY
(2022)
Article
Ecology
Sam Leggett, Alice Rose, Estelle Praet, Petrus Le Roux
Summary: Human isotopic ecology aims to study humans as part of ecosystems, utilizing large datasets of biomolecular data to address the complexities of human ecology and past socioenvironmental dynamics. This multidisciplinary approach provides insights into diet, agriculture, climate change, human-animal interactions, mobility/migration, and more, enabling a greater understanding of human-environment interactions throughout history.
Article
Geology
Megan E. Smith, Donald F. McNeill, Sean T. Murray, Peter K. Swart
Summary: Carbonate concretions from the Dominican Republic provide an opportunity to study isotopic variations and environmental conditions during concretion growth. A multi-isotope approach was used to evaluate three concretions from the Cibao Basin, revealing differences in growth mechanisms and environmental changes. The study also showed potential disequilibrium effects and cautioned about the influence of multiple processes on concretion signals.
Article
Geochemistry & Geophysics
Gaojun Li, Ruiyu Yang, Zhewen Xu, Jens Hartmann, David W. Hedding, Xianhua Li, Richard E. Ernst, Zhong-Hai Li, Hao Zou, Zhongquan Li, Jun Chen
Summary: Weathering plays a significant role in the Earth system. This study investigates continental weathering using detrital zircon and reconstructs a nearly three-billion-year history of weathering. The results show a correlation between long-term weathering evolution and supercontinent assembly cycles, but further testing is required.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Katrin Weber, Michael Weber, Martina Menneken, Anna G. Kral, Regina Mertz-Kraus, Thorsten Geisler, Jochen Vogl, Thomas Tuetken
Summary: Experimental alteration of dental tissues from modern African elephants reveals that temperature and acidity can affect isotope ratios and element distribution in teeth, with enamel being more resistant to changes compared to dentin.
Article
Geosciences, Multidisciplinary
Peng Wang, Shuai Yin, Zhongmin Shen, Tong Zhu, Wenkai Zhang
Summary: Formation water in the Xujiahe tight sandstone reservoir in the study area was determined to be mainly of seawater origin, with some high salinity NaHCO3 water. The presence of Br suggests infiltration, overpressured hydrocarbon expulsion, and diagenesis. The study provides evidence for the marine sedimentary environment of the Xujiahe Formation and guidance for exploring high-quality reservoirs.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
Benjamin R. Fosu, Prosenjit Ghosh, Tobias B. Weisenberger, Simon Spuergin, Shrinivas G. Viladkar
Summary: Carbonatites, composed mainly of carbonates, were studied using triple oxygen isotope analyses to understand their formation processes and evaluate the oxygen isotope behavior during their genesis. Results show that the isotopic fractionation in different carbonate phases is similar, independent of mineralogy, suggesting variations may be related to rock alteration. The study also indicates that diagenetic alteration and mixing of carbonate sources can significantly impact the isotopic compositions of carbonatites, obliterating their primary mantle signatures.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Courtney Holden, T. Kurtis Kyser, Fred J. Longstaffe, Yuxiang Wang, John M. Casselman
Summary: The stable isotope compositions of otoliths can provide thermal histories of fish. This study focused on catadromous species, the American eel, and developed an isotopic fractionation equation to determine its thermal history in freshwater. The results showed that otolith growth can be decoupled from body growth, and the equation accurately predicted water temperature for the otoliths. This study has important implications for understanding the thermal history of wild eels.
Article
Geochemistry & Geophysics
Ozioma Carol Uwakwe, Sylvia Riechelmann, Rene Hoffmann, Christoph Spoetl, Anne Jantschke, Maximilian Hansen, Adrian Immenhauser
Summary: This study presents an experimental approach to calculate the isotopic composition of the precipitating solution in cryogenic cave carbonates (CCC). The experiments show that the morphology and precipitation sequence of CCC are related to the water chemistry changes. This research provides constraints for interpreting the morphology and isotopic composition of ancient CCCs.
Article
Geochemistry & Geophysics
Jamie K. Lucarelli, Bettina Purgstaller, Robert N. Ulrich, Zeeshan Parvez, Albrecht Leis, Katja E. Goetschl, Robert A. Eagle, Martin Dietzel, Aradhna Tripati
Summary: The presence of amorphous precursors to minerals in laboratory materials and in nature has been observed, with implications in various disciplines. Little is known about the isotopic composition and evolution of isotopic values during the transformation of amorphous carbonates into minerals. This study investigated the evolution of isotopic values in amorphous carbonates and mineral transformation products, revealing the existence of disequilibrium isotopic compositions in the dissolved inorganic carbon pool. The results suggest the presence of a highly dynamic localized environment in biomineralizing organisms and abiotic systems. The isotopic values of carbonate minerals may not accurately represent the formation temperature.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geography, Physical
Nyebe E. Mohale, Daryl Codron, Liora K. Horwitz
Summary: This study investigates the paleoenvironment and dietary behavior of ancient herbivores in the South African central interior during the Mid-Pleistocene, using carbon and oxygen stable isotopes analysis on tooth enamel carbonate. The results suggest that the herbivores mainly had C-4 based diets and the region was substantially wetter than in modern times.
QUATERNARY INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Christophe Thomazo, Pierre Sansjofre, Olivier Musset, Theophile Cocquerez, Stefan Lalonde
Summary: The study introduces a new protocol for carbonates analysis using a laser calcination system, which reduces preparation steps and analysis time significantly while offering spatially resolved analysis at the mm scale. The new method based on a fiber-coupled laser diode device shows accurate and reproducible results for C and O isotopic characterization of natural carbonates. The study also demonstrates that physical effects during calcination do not introduce isotopic fractionation for C and a constant isotopic offset for O within a range of isotopic compositions and mineral matrices.
Article
Geography, Physical
Laszlo Kocsis, Alex Ulianov, Mustapha Mouflih, Fatima Khaldoune, Emmanuel Gheerbrant
Summary: Various geochemical analyses were conducted on Paleogene terrestrial mammal remains to determine their taphonomy, stratigraphic provenance, and paleoenvironmental conditions. The results suggest that the mammal fossils were initially deposited in a marine setting before being washed into the sea. By comparing ratios with background datasets, researchers were able to characterize the stratigraphic levels bearing the fossils.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Engineering, Chemical
Shengnan Liu, Shiju Liu, Gang Gao, Rukai Zhu
Summary: In this study, the enrichment mechanism of organic matter and the geofluid migration mode in stylolites developed in carbonate rocks were investigated. The results showed that the organic matter within the stylolites mainly consisted of secondary migrated organic matter. The stylolites also exhibited well-developed secondary minerals, contributing to the accumulation and migration of oil and gas. The study also highlighted the challenges in oil-source correlations posed by stylolite fractionation and suggested future research directions.
Article
Multidisciplinary Sciences
Christina Ifrim, Wolfgang Stinnesbeck, Arturo H. Gonzalez Gonzalez, Nils Schorndorf, Andrew S. Gale
Summary: The study revises the historical specimens and documents new material of the world's largest ammonite, Parapuzosia. The analysis provides insight into the ontogeny of Parapuzosia and the evolution of this species from its potential ancestor. The findings suggest a possible monocyclic reproduction strategy in this giant cephalopod.
Article
Geography, Physical
Huyue Song, Shixue Hu, Michael Benton, Dayong Jiang
Summary: This article examines the end Permian to Middle Triassic interval, which witnessed a significant marine mass extinction and delayed recovery. The focus is on Triassic marine sediments in South China, providing unique documentation of the collapse and recovery of marine ecosystems. Several papers analyze different fossils and their ecological significance, while others study biostratigraphy, reconstruct paleoenvironments, and link records to volcanic eruptions.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Mohammad Firoze Quamar, Upasana Swaroop Banerji, Biswajeet Thakur, Ratan Kar
Summary: The Indian Summer Monsoon is a crucial component of the Asian Monsoon System, impacting rainfall, agricultural productivity, and socio-economic growth in India and nearby regions. The central monsoon zone in India is more responsive to strong monsoon phases than weak ones.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Maria Laura Balestrieri, Valerio Olivetti, David Chew, Luca Zurli, Massimiliano Zattin, Foteini Drakou, Gianluca Cornamusini, Matteo Perotti
Summary: This study presents a multidisciplinary provenance study on legacy cores drilled in the central Ross Sea, Antarctica, providing insights into the oscillation of ice flows and advance and retreat phases of the West Antarctic Ice Sheet.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
P. Depuydt, S. Toucanne, C. Barras, S. Le Houedec, M. Mojtahid
Summary: This study provides a comprehensive overview of the dynamics of the upper branch of the Atlantic Meridional Overturning Circulation (AMOC) in the mid-latitudes of the Northeast Atlantic. It focuses on the European Slope Current (ESC) and its glacial equivalent known as the Glacial Eastern Boundary Current (GEBC). The study reveals significant changes in flow strength and ventilation during the glacial and deglaciation periods, as well as a gradual weakening of the slope current during the Holocene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Junhee Park, Holly J. Stein, Judith L. Hannah, Svetoslav V. Georgiev, Oyvind Hammer, Snorre Olaussen
Summary: This study reports new Re-Os ages for black shales from Svalbard and evaluates the paleoenvironment during organic-rich shale deposition. The study also proposes correlations of specific Late Jurassic ammonite zones between the Boreal and Tethyan realms.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Guocheng Dong, Weijian Zhou, Feng Xian, Yunchong Fu, Li Zhang, Ling Tang, Pengkai Ding
Summary: The cause of ice-age cycles is still not fully understood, and studying the timing and magnitude of mountain glaciations can provide valuable insights. This study presents new dating results from the Niqingqu Valley in the Tibetan Plateau, showing multiple glacial activities prior to the Penultimate Glacial Maximum. The findings suggest that low atmospheric CO2 content and reduced summer solar insolation/high summer-monsoon precipitation played a role in these glacial fluctuations.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Haoran Dong, Zhitong Chen, Yucheng Wang, Jie Chen, Zhiping Zhang, Zhongwei Shen, Xinwei Yan, Jianbao Liu
Summary: Through sediment records from Lake Nanyi in the lower Yangtze, we found that anthropogenic fire activity played a dominant role in the region, and the temporal pattern of fire activity was asynchronous from east to west. Archaeological evidence suggests an inverse relationship between agricultural and population levels and fire intensity during the mid-Holocene, with fire intensity being influenced by the diversity of landscape types associated with pre-historic subsistence patterns. Overall, changes in regional water-level delayed the transition from hunting-gathering to agriculture in the lower Yangtze region.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Giovanni Coletti, Giulia Bosio, Alberto Collareta, Or Mordecai Bialik, Eleonora Regattieri, Irene Cornacchia, Gianni Insacco, John Buckeridge
Summary: This paper argues that sessile barnacles are an excellent proxy for palaeoenvironmental reconstructions. The shells of barnacles consist of diagenetically stable low-magnesium calcite and record short-term variations. Analyses of several Western Mediterranean barnacle-rich deposits demonstrate the utility of barnacles as proxies for water depth, distance from the coastline, and hydrodynamic conditions. Moreover, the stable isotope ratios of barnacle shells can provide detailed palaeoenvironmental information.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Feng Wu, Xinong Xie, Wen Yan, Youhua Zhu, Beichen Chen, Jianuo Chen, Mo Zhou
Summary: This paper describes the Quaternary evolution of Meiji Atoll in the southern South China Sea. The findings show how variations in sea surface temperature, eustatic sea level, and tectonics have influenced the development of the atoll. These findings have broader implications for understanding the Quaternary evolution of similar tropical carbonate atolls in the region.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Ana Mateos, Ericson Hoelzchen, Jesus Rodriguez
Summary: The Epivillafranchian and the transition to the Galerian was a period of environmental fluctuations and faunal turnover. Hominins and giant hyenas could coexist during the Epivillafranchian, but the transition to the Galerian led to a disruption of the scavenging niche, coinciding with the extinction of P. brevirostris.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Tianyu Du, Wensheng Zhang, Bing Li, Linjing Liu, Yuecong Li, Yawen Ge, Shiyong Yu
Summary: This article presents sedimentary evidence for a dramatic channel displacement of the lower Yellow River about 3000-2600 years ago, and explains the impact of this displacement on the geomorphology and human migration.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Johann Mueller, Michael M. Joachimski, Oliver Lehnert, Peep Mannik, Yadong Sun
Summary: The Late Ordovician mass extinction occurred during an ice age, with maximum ice coverage and a substantial drop in global sea level. This led to the exposure or shallowing of shallow tropical shelf environments. The study suggests that the burial rate of nutrient phosphorus (P) on shelves was minimal during this glacial period, leading to excess bioavailable P entering the open ocean and stimulating phytoplankton production, which in turn lowered oxygen concentrations.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Marina Addante, Patrizia Maiorano, Giovanna Scopelliti, Angela Girone, Maria Marino, Samanta Trotta, Antonio Caruso
Summary: This study presents the first high-resolution results on planktonic foraminiferal stable oxygen isotopes and calcareous plankton assemblages, providing insights into the glacial-interglacial variability and North Atlantic climate variability. The research also reveals evidence of the first significant southward migration of the Subarctic Front in the mid-latitudes.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Bing-Cai Liu, Rui-Wen Zong, Kai Wang, Jiao Bai, Yi Wang, Hong-He Xu
Summary: Phytogeography plays a vital role in the evolution of plants. This paper describes a new species of a spore-bearing plant from the upper Silurian period in West Junggar, China. By analyzing global Silurian macrofossil records, the study reveals the spatial-temporal distribution of Silurian plant macrofossils and identifies two phytogeographic realms during the Pridoli Epoch.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Francois Fournier, Thomas Teillet, Alexis Licht, Jean Borgomano, Lucien Montaggioni
Summary: This study investigates the temporal evolution of neritic carbonates in the proto-South China Sea to reconstruct East Asian monsoonal currents and winds during the middle to late Paleogene. The results highlight that many of the features of the summer East Asian Monsoon large-scale circulation are rooted in the middle Paleogene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)