Article
Geochemistry & Geophysics
Rui Bao, Xuefen Sheng, Chenglong Li, Can Cui, Hao Yan, Junfeng Ji, Jun Chen
Summary: The application of Δ47 in land snails as a temperature proxy is relatively rare compared to other carbonate materials. This study cultured two species of land snails under controlled temperature conditions and found a significant negative correlation between shell Δ47 values and culturing temperature within their respective optimum temperature ranges. However, shell Δ47 values at lower temperatures showed a negative deviation, which may be attributed to a vital effect associated with CO2 degassing during carbonate precipitation.
Editorial Material
Geosciences, Multidisciplinary
Raphael Pietzsch
Summary: The study suggests that sediments in the South Atlantic basins may have been influenced by hydrothermal fluids, but the current evidence is not sufficient to definitively support this hypothesis, therefore further scrutiny is needed.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Emily J. Beverly, Naomi E. Levin, Benjamin H. Passey, Phoebe G. Aron, Drake A. Yarian, Mara Page, Elise M. Pelletier
Summary: The study investigates the relationship between Delta'O-17 in soil carbonates and soil water evaporation, finding that in arid climates, the variance in soil carbonate Delta'O-17 is driven by soil water evaporation, showing the potential to track paleoaridity.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Ella A. Holme, Gregory A. Henkes, Nicholas J. Tosca, E. Troy Rasbury, Jordan M. Young, D. R. Schaub, Hanna Nekvasil, Joel A. Hurowitz
Summary: We conducted chemostatic siderite precipitation experiments using a modified constant composition method at temperatures ranging from 15 to 75 degrees C. Our results indicate a composite low temperature relationship for siderite clumped isotope ratios (D47) and its dependence on temperature, which differs from other carbonate minerals in terms of intercept but not slope.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Eva L. Scheller, Miquela Ingalls, John M. Eiler, John P. Grotzinger, Uri Ryb
Summary: Through heating experiments of MHC, the researchers found that the stable isotopic compositions of ikaite pseudomorphs can be used for paleoclimate reconstruction, providing information about water temperature, δ18O(CARB), δ18O(fluid), and δ13C(CARB) which are influenced by dehydration diagenetic effects.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
A. Licht, J. Kelson, S. Bergel, A. Schauer, S. Petersen, A. Capirala, K. W. Huntington, G. Dupont-Nivet, Zaw Win, Day Wa Aung
Summary: The mechanisms and timing of pedogenic carbonate formation in the tropical domain are more ambiguous compared to mid latitudes. This study in Myanmar shows that carbonate growth is delayed to the driest and coldest months due to sustained monsoonal rainfall. High soil moisture year-round narrows carbonate growth to the driest months and makes it sensitive to the seasonal distribution of rainfall. Clumped isotope values of tropical pedogenic carbonates can potentially be used to track past tropical rainfall distribution.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Jordon D. Hemingway, Gregory A. Henkes
Summary: This study proposes a new kinetic model for the temperature evolution of carbonate clumped isotopes, suggesting that previous models underestimate low-temperature alteration and overestimate Delta(47) blocking temperatures. The research provides insights into the nature of carbonate C-O bonds and offers a framework for future experiments in this field.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
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
Geology
Rui Wang, Yang Xiao, Kefu Yu, Brian Jones, Lu Wu, Feng Liang, Yang Yang, Biao Chang
Summary: Carbonate dumped isotope thermometry is a useful technique for studying the temperature and salinity of water that influenced the development of dolostones on isolated oceanic islands. This study focuses on a thick succession of Miocene dolostones found on the Xisha islands in the South China Sea. Despite the challenges of analyzing mixed dolomite types, clumped isotope thermometry can still provide valuable information about the dolomitization processes.
SEDIMENTARY GEOLOGY
(2022)
Review
Astronomy & Astrophysics
KatharineW. Huntington, Sierra V. Petersen
Summary: Carbonate minerals have stable isotopes of carbon and oxygen that exhibit thermodynamic control over their abundances and bond arrangements. The clumped isotopic value Delta(i) measures the temperature-dependent preference of heavy isotopes to clump together in the carbonate phase. Carbonate clumped isotope thermometry uses Delta(i) values to determine mineral growth temperature independent of water isotopic composition. Its development has provided a mature temperature proxy with a wide applicability and high precision, contributing significantly to geological and biological sciences.
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES
(2023)
Article
Geochemistry & Geophysics
Damien Huyghe, Mathieu Daeron, Marc de Rafelis, Dominique Blamart, Mathieu Sebilo, Yves-Marie Paulet, Franck Lartaud
Summary: Clumped-isotope thermometry is an alternative approach for temperature reconstructions of carbonates, utilizing Delta(47) measurements without the need for independent information on the oxygen isotope composition of parent waters. New calibration observations on marine bivalves from various ecosystems reaffirm the efficacy and accuracy of this method for paleoclimatic temperature reconstructions.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Philip T. Staudigel, John A. Higgins, Peter K. Swart
Summary: This study utilized a numerical model and various isotope measurement techniques to investigate the changes in fluid advection rates over time, revealing a significant shift in the relative contributions of different mechanisms governing fluid flow around 13 million years ago.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geography, Physical
Haolin Tan, Rui Bao, Chenlong Li, Xuefen Sheng, Jun Chen
Summary: We investigated the carbon isotopic composition (δ13C) of snail shells in Hainan Island, China, and found that it mainly reflects the δ13C of C3 plants and is related to precipitation. We established a new equation between δ13C and precipitation, which can potentially be used for quantitative reconstruction of paleo-precipitation in the East Asian monsoon region.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Niels J. de Winter, Rob Witbaard, Ilja J. Kocken, Inigo A. Muller, Jingjing Guo, Barbara Goudsmit, Martin Ziegler
Summary: Clumped isotope thermometry can independently constrain the formation temperatures of carbonates, but calibration samples close to the formation temperatures of the samples are needed to accurately perform paleoclimate reconstructions.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geology
Miquela Ingalls, Anne C. Fetrow, Kathryn E. Snell, Carie M. Frantz, Elizabeth J. Trower
Summary: Stromatolites serve as important indicators for studying deep-time paleoclimatic and geobiological conditions. Giant stromatolites found in the Laney Member of the Eocene Green River Formation in Colorado, USA, were influenced by factors such as substrate availability, physicochemical conditions, and lake level changes. The growth of these stromatolites was facilitated by decreased lake levels, which promoted carbonate precipitation and positioned microbial communities within the photic zone.
Article
Geosciences, Multidisciplinary
Yangrui Guo, Wenfeng Deng, Xi Liu, Kai Kong, Wen Yan, Gangjian Wei
Summary: This study focuses on the Delta(47) values of island carbonates from the Meiji Reef in the South China Sea to constrain the diagenetic environment, finding that most diagenetic alteration likely occurred at water depths around 200 meters below sea level at temperatures between 15 and 28 degrees Celsius. The fluids involved in the formation of diagenetic calcites and dolomites have similar delta O-18 values to modern seawater.
Article
Environmental Sciences
Huiling Kang, Xuefei Chen, Wenfeng Deng, Xijie Wang, Hao Cui, Xi Liu, Guanqiang Cai, Ti Zeng, Jian-xin Zhao, Gangjian Wei
Summary: The study reveals significant warming and persistent acidification in the open ocean of the northern South China Sea since the 1960s, leading to a slight decline in coral skeletal density while coral extension and calcification show an overall increasing trend. However, coral calcification has persistently decreased since the 1960s, indicating a pessimistic situation for corals in the northern South China Sea.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Geochemistry & Geophysics
Kai Kong, Wenfeng Deng, Yangrui Guo, Chunsheng Jin, Qingsong Liu, Gangjian Wei
Summary: This study investigated possible carbonate alteration during burial of the Fenghuoshan Group in the northern Tibetan Plateau, China using the Delta(47) thermometer. Results showed that carbonates underwent progressive microscale recrystallization during deep burial, modifying their Delta(47) values. While the solid-state reordering model failed to predict the Delta(47) values accurately, most measured values were in agreement with predictions from recrystallization models.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Xuefei Chen, Wenfeng Deng, Huiling Kang, Ti Zeng, Le Zhang, Jian-xin Zhao, Gangjian Wei
Summary: The study reveals significant intercolony differences in coral boron systematics, with fossil corals showing higher CF pH compared to modern corals. Ocean acidification has been evident in the northern South China Sea since the industrial era, but there has been a recovery in seawater pH in east Hainan Island from 1980 to 2010, slowing down the pace of acidification.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Geochemistry & Geophysics
Yangrui Guo, Wenfeng Deng, Gangjian Wei
Summary: This study presents experimental constraints on the kinetic fractionation factors (KFFs) associated with rapid carbonate growth and their temperature dependence. The results provide important implications for new isotope fractionation models for natural carbonates.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geography, Physical
Yuxuan Wei, Wenfeng Deng, Jinlong Ma, Xuefei Chen, Ti Zeng, Gangjian Wei
Summary: This study investigated the climate and environmental significance of stable strontium isotope composition (delta Sr-88) in coral skeletons. The results showed that delta Sr-88 values were not significantly correlated with factors like sea surface temperature, but showed a significant correlation with total solar irradiance (TSI). TSI may play a major role in controlling coral delta Sr-88 values at the study site.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geography, Physical
Hao Cui, Wenfeng Deng, Xi Liu, Huiling Kang, Xuefei Chen, Ti Zeng, Guanqiang Cai, Jian-xin Zhao, Gangjian Wei
Summary: The South China Sea is a major source of water vapor for China and East Asia, with its precipitation variability controlled by the East Asian Monsoon and El Ninô-Southern Oscillation. However, the lack of long-term observational records limits our understanding of decadal variability in South China Sea precipitation. Therefore, climate proxies are necessary to obtain preinstrumental records and improve predictions.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geography, Physical
Ning Wang, Chengde Shen, Ping Ding, Xingfang Ding, Kexin Liu, Weidong Sun, Xuefei Chen, Wenfeng Deng, Gangjian Wei
Summary: Ocean circulation has significant impacts on the marine environment and climate change. However, the seasonal to centennial variations of the paleocirculation in the South China Sea (SCS) and their driving forces remain unclear. This study reconstructed a high-resolution coral record to investigate the seasonal variations of SCS ocean circulation during a grand solar minimum period, providing insights into the driving forces of ocean circulation and climate change in the SCS.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geography, Physical
Huimin Guo, Wenfeng Deng, Xuefei Chen, Xi Liu, Ti Zeng, Jian-xin Zhao, Gangjian Wei
Summary: Seasonal sea surface temperature variations during the Medieval Climate Anomaly in the Qiongdong upwelling area of the South China Sea were reconstructed using coral records. The study found a negative correlation between summer SST and the East Asian Summer Monsoon, while winter SST showed no correlation with the East Asian Winter Monsoon. The differences in summer and winter SST averages between the Medieval Climate Anomaly and the Current Warm Period were attributed to variations in the intensity of the East Asian monsoons.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Xuefei Chen, Wenfeng Deng, Hangfang Xiao, Huimin Guo, Ti Zeng, Jian-xin Zhao, Gangjian Wei
Summary: Researchers have examined fossil corals from the South China Sea and found that the 4.2 ka BP event was characterized by cooler climate and meridional dry-wet patterns in East Asia. Additionally, their examination of coral records from other ocean regions suggests that SST anomalies in the tropical Pacific played a crucial role in driving hydrology shifts in East Asia during this time period.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Kai Kong, Yangrui Guo, Wenfeng Deng, Gangjian Wei
Summary: Carbonate clumped isotope, quantified by ?(47) value, has wide application potential in Earth science. A recently proposed carbonate standardisation scheme has proven to improve interlaboratory comparability in ?(47) measurement. Developing traceable and supplementary in-house reference materials may become necessary for future applications.
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
(2023)
Article
Geography, Physical
Hongqiang Yang, Wenfeng Deng, Hong Yan, Feifei Zhang
Summary: This special issue focuses on the evolution of coral reefs in the South China Sea and aims to enhance our understanding of Holocene environmental and climate changes in the region and their driving mechanisms. It consists of twenty-four papers organized into seven themes, covering various aspects of coral reefs and their records. The findings of this special issue contribute to a better understanding of Holocene paleoclimates and paleoenvironments in the South China Sea, as well as the development and protection of coral reef systems.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Jieqiong Zou, Wenfeng Deng, Xuefei Chen, Xi Liu, Yangrui Guo, Guanqiang Cai, Xiaoping Xia, Qing Yang, Yanqiang Zhang, Ti Zeng, Gangjian Wei
Summary: High-resolution delta O-18 values in coral skeletons were analyzed using secondary ion mass spectrometry in Porites corals from the South China Sea and the Great Barrier Reef. The results showed that temperature has a significant effect on micrometer-scale coral delta O-18 variations, while the effects of seawater delta O-18 and growth rate were found to be minor. Abnormally negative delta O-18 values could be attributed to ion bombardment on calcification centers.
SOLID EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Zhen-Min Ge, Xiao-Long Huang, Wei Xie, Tobias W. Hofig, Fan Yang, Yang Yu, S. Khogenkumar Singh
Summary: The mantle source composition of the nascent oceanic crust in the central part of the Gulf of California has been investigated using basaltic glass samples. These samples show trace element patterns similar to enriched mid-ocean ridge basalts, suggesting that the nascent oceanic crust in the Guaymas Basin might be generated through partial melting of a depleted mantle source metasomatized by subducted slab materials.
Article
Geochemistry & Geophysics
Jean-Michel Brazier, Katja E. Goetschl, Martin Dietzel, Vasileios Mavromatis
Summary: This study estimated the distribution coefficient of Zn2+ between calcite/aragonite and reactive fluids and found that the growth rate strongly influences D-Zn(2+) in both minerals. Additionally, a linear correlation was found between D-Zn(2+) and the saturation degree of the reactive fluid.
Article
Geochemistry & Geophysics
Ming Lei, Michele Lustrino, Jifeng Xu, Zhiqiang Kang, Zhengfu Guo, Jianlin Chen
Summary: This study presents a comprehensive geochronological, mineralogical, and geochemical analysis of olivine leucitites in the Maiga area of southern Tibet, suggesting that these rocks originate from a carbonated peridotite mantle source and highlighting the possibility of carbonates being recycled deep into the mantle during continental subduction.
Article
Geochemistry & Geophysics
Yuntao Ye, Xiaomei Wang, Huajian Wang, Haifeng Fan, Zhigang Chen, Qingjun Guo, Ziteng Wang, Chaodong Wu, Donald E. Canfield, Shuichang Zhang
Summary: Phosphorus is an essential element for life and its cycle in the ocean is closely connected with the carbon and oxygen cycles. The study of phosphate oxygen isotopes can provide insights into various reactions related to phosphorus. By analyzing carbonate fluorapatite samples from the Mesoproterozoic Era in North China, it was found that the oxygen isotope values were lower compared to modern samples, indicating a warmer climate during that time period and a potential reason for the scarcity of phosphorite.
Article
Geochemistry & Geophysics
Vincent Busigny, Oanez Lebeau, Didier Jezeduel, Carine Chaduteau, Sean Crowe, Magali Ader
Summary: This study conducted high-precision Mo isotope research on hydrothermal metal sulfides from a porphyry copper deposit in Southwest China and found that different stages of mineralization have distinct Mo isotope compositions, providing valuable insights into the behavior of Mo isotopes in magmatic-hydrothermal systems.
Article
Geochemistry & Geophysics
Min Ji, Xiao-Ying Gao, Yong-Fei Zheng, Bing Gong
Summary: The study examines the anatectic mechanisms in the Himalayan orogen, finding that pressure and temperature control the reaction, while water content mainly affects the solid-phase composition. Dehydration and hydration melting likely occur at different depths in the crust. This research provides important insights into the melting processes in collisional orogens.
