Review
Geosciences, Multidisciplinary
Jack F. Ward, Gideon Rosenbaum, Teresa Ubide, Jonny Wu, John T. Caulfield, Mike Sandiford, Derya Guerer
Summary: Studies have shown that intraplate volcanoes in East Asia are likely formed by decompression melting associated with convective upwellings at the edges of the Pacific and Philippine Sea slabs, rather than mantle plume activity or typical subduction zone slab metasomatism. The Quaternary rollback of the Philippine slab may also be responsible for volcanic activity at Jeju, located at the leading edge of the Philippine Sea slab.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geochemistry & Geophysics
Sheng-Peng Wang, Zhong-Yuan Ren, Alexander R. L. Nichols, Tserendash Narantsetseg, Qing-Lin Zhang, Le Zhang, Chao Yuan
Summary: The Cenozoic basalts in eastern China are believed to be related to the mantle wedge beneath East Asia. However, the basalts in central and eastern Mongolia, which have similar characteristics, are located far from this mantle system. By analyzing the compositions of basalts, olivines, spinels, and olivine-hosted melt inclusions from Mongolia, researchers found high temperatures and thermal anomalies in the mantle sources feeding the volcanism. They propose a branched plume model to explain the similarity of geochemistry and eruption ages for basalts on both sides of the Daxinganlin-Taihangshan gravity lineament (DTGL).
Review
Geosciences, Multidisciplinary
Chuansong He
Summary: This study utilizes seismic analysis to find the remnants of a mantle plume beneath the North China Block and large-scale mantle upwelling beneath the South China Block during the Mesozoic era. The study also discusses the correlation between these mantle activities and gold mineralization and metallogenesis.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
Chiara Civiero, Sergei Lebedev, Nicolas L. Celli
Summary: Hot plumes rising from Earth's deep mantle can cause uplift, rifting, and the formation of large igneous provinces (LIP). Through new technology, researchers have discovered hot, partially molten rock corridors in the East Africa-Arabia region, which are fed by three mantle upwellings. This suggests that complex-shaped plume heads can explain the scattered volcanism in broad areas and may be an inherent feature of plume-continent interaction.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Review
Geosciences, Multidisciplinary
Rixiang Zhu, Weidong Sun
Summary: The Circum-Pacific subduction zone is a renowned gold metallogenic domain in the world, with important gold metallogenic provinces such as the North China Craton and Nevada. Formation of ore-forming fluids is related to the destruction of cratons and involves hydrated hydrous minerals like Phases A to E releasing sulfur-rich fluids. The destabilization of a water- and gold-rich weak layer during craton destruction accelerates the release of gold-bearing fluids for explosive gold mineralization.
SCIENCE CHINA-EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Anatoliy Petrovich Sorokin, Andrey Alexeyevich Konyushok, Valeriy Mikhailovich Kuz'minykh, Sergey Vadimovich Dugin
Summary: This study identified the primary sources and conditions for the formation of Paleogene-Neogene coal-bearing deposits in the Zeya-Bureya sedimentary basin through paleogeographic reconstructions and geochemical analyses. A new model of element transfer into coal was proposed, involving two complementary processes to explain the introduction and concentration of gold and other trace elements in the investigated sequences.
Article
Geology
Alireza Zarasvandi, Mohsen Rezaei, Johann G. Raith, David R. Lentz
Summary: The study revealed that granitoid intrusions in the Zagros orogenic belt exhibit different geological features at different geological times, with the Cenozoic intrusions being more hydrous and oxidized, which facilitated the formation of mineral deposits.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geochemistry & Geophysics
Michael Anenburg, Sam Broom-Fendley, Wei Chen
Summary: Carbonatites and related rocks are the primary source for light rare earth element (LREE) deposits, where LREEs strongly partition to carbonatite melts, forming primary alkali REE carbonates. These primary carbonates are rarely preserved and are usually dissolved by later fluids, being replaced by other minerals like monazite and alkali-free REE-(fluor) carbonates.
Article
Geochemistry & Geophysics
Tahiry A. Rajaonarison, D. Sarah Stamps, John Naliboff, Andrew Nyblade, Emmanuel A. Njinju
Summary: Geodynamicists use high-resolution 3D thermomechanical models to investigate the forces driving continental rifting in the East African Rift. They find that the anomalous surface deformation and seismic anisotropy in the rift are primarily driven by northward mantle flow associated with the African Superplume.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Jean-Christophe Wrobel-Daveau, Graeme R. Nicoll Halliburton
Summary: This paper introduces a new approach to predicting potential porphyry deposits by screening global volcanic arcs and their duration. Using geospatial and temporal analytics, the method combines large datasets and a plate tectonic model to calculate magmatic arc occurrences over time, providing a model for cumulative duration of magmatic arc activity on a global scale.
Article
Geochemistry & Geophysics
Shaofeng Liu, Pengfei Ma, Bo Zhang, Michael Gurnis
Summary: Through geodynamic modeling and geological reconstructions, it was found that the subducted western Pacific slab was torn during the Miocene, with mantle flow contributing to shaping the horizontal slab and causing dynamic subsidence along the East Asia margin. The relatively minor changes in dynamic topography predicted from models fitting the horizontal slab are consistent with the limited residual topography changes noted over the past 50 million years.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Dapeng Zhao
Summary: Recent studies on seismic imaging of the Northwest Pacific and East Asian region have revealed significant lateral heterogeneities in the crust and upper mantle, shedding new light on various geological processes such as volcanism, earthquake mechanisms, and mantle dynamics. Significant advancements in seismic imaging techniques, particularly tomographic inversions for 3-D distribution of seismic anisotropy and attenuation, have provided important insights into lithospheric deformation, mantle convection, and the processes associated with plate subductions.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geology
Jingwen Mao, Peng Liu, Richard J. Goldfarb, Nikolai A. Goryachev, Franco Pirajno, Wei Zheng, Meifu Zhou, Chao Zhao, Guiqing Xie, Shunda Yuan, Min Liu
Summary: Effective ore deposit exploration seeks distinct geological conditions to enhance ore-forming processes. Large-scale metal accumulation for ore deposits is usually associated with specific tectonic events. An active continental margin extensional setting can define an important tectonic environment for the development of a world-class regional metallogenic province after certain tectonic stresses.
ORE GEOLOGY REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
Wang Tong, Sun Jie, Lin Zhongyue, Fang Huiming, Wang Yue, Liu Yifen
Summary: China is a top producer of coal resources and has numerous coal-rich basins country-wide that also contain coalbed methane. Recent exploration of coal and CBM resources has led to the discovery of rare and precious metal minerals. Coordinated exploration techniques have expanded the exploration target from coal seams to coal-associated series, achieving efficient and practical exploration of natural resources.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2021)
Article
Geology
Nan Li, Feng Bai, Lingling Xu, Yandong Che
Summary: This study systematically examines the geochemical characteristics and mineralization mechanism of nephrite in Luodian, Guizhou Province. The results show that the main mineral is tremolite and the secondary minerals include diopside, calcite, quartz, albite, talc, and iron and manganese oxides. The formation of nephrite in Luodian is attributed to the contact metasomatism of basic diabase and carbonate rock during the Indosinian-Yanshannian period.
ORE GEOLOGY REVIEWS
(2023)
Article
Engineering, Environmental
Na Xu, Yuchen Yang, Mengmeng Peng, Qing Li, Chuanpeng Xu, Shifeng Dai
Summary: Combustion of coal produces coal combustion residues (CCRs) that contain naturally occurring radioactive materials (NORMs), which can be harmful to humans. The activity of CCRs depends on both the concentrations of radionuclides and the variations in coal ash yields. Therefore, determining threshold values for radionuclides in coal with different ash yield levels is significant.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Energy & Fuels
Victor P. Nechaev, Shifeng Dai, Igor Yu Chekryzhov, Irina A. Tarasenko, Alexander Zin'kov, Tim A. Moore
Summary: Miocene coal beds in the Siniy Utyes Basin, South Primirye, in eastern Russia, contain elevated concentrations of rare earth elements and other trace elements. These elements are sourced from weathered granites rather than volcanic ash layers. The presence of certain minerals in both the coal and volcanic ash suggests a post-depositional emplacement of these elements. The enrichment of elements in the coal proximal to the volcanic ash layers may be attributed to higher permeability and a geochemical barrier at the coal/volcanic ash interface.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Ning Wang, Shifeng Dai, Victor P. Nechaev, David French, Ian T. Graham, Fenghua Zhao, Jianping Zuo
Summary: This paper examines the occurrence of siderite in tuffaceous mudstone from Yujingshan, eastern Yunnan, southwestern China, suggesting a hybrid origin for siderite formation involving hydrothermal alteration of volcanic materials. The findings indicate a relationship between siderite and minerals like quartz, ilmenite, and chromite, with calculated values for paleosalinity and paleotemperature.
Review
Geochemistry & Geophysics
Victor P. Nechaev, Frederick L. Sutherland, Eugenia Nechaeva
Summary: This study tests the hypothesis of Cretaceous Turn of Geological Evolution (CTGE) using a large dataset on mineral deposits of NE Asia. The results show that the geodynamic activities in NE Asia during the Triassic-Early Jurassic and Late Cretaceous-Paleogene were simple, producing relatively small amount of mineral deposits. However, the greatly increased geodynamic activity around CTGE produced a huge amount of mineral deposits. The characteristic mineral deposits during this period are represented by the unique Jurassic-Early Cretaceous plume-related Ti-Fe-V (+P + Cr-PGE + Au + diamond) ores.
Article
Geochemistry & Geophysics
Shaobo Di, Shifeng Dai, Victor P. Nechaev, Shaowei Zhang, David French, Ian T. Graham, Baruch Spiro, Robert B. Finkelman, Yongjie Hou, Yuchuan Wang, Rui Zhang
Summary: This study presents mineralogical and geochemical data on the No. 4 coal seam in the Ningwu Coalfield, Shanxi Province, northern China, and discusses the origin and potential economic significance of critical elements in the coal.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2022)
Article
Geochemistry & Geophysics
Ning Wang, Shifeng Dai, Xibo Wang, Victor P. Nechaev, David French, Ian T. Graham, Lei Zhao, Xiaolin Song
Summary: The volcaniclastic horizons near the Guadalupian-Lopingian Boundary in southwest China have attracted attention due to their potential economic significance and the End-Guadalupian mass extinction. This study presents a systematic analysis of the petrological, mineralogical, and geochemical features of these volcaniclastics. The results provide insights into the distribution and sources of critical metals, contributing to the understanding of mineralization and geological exploration in this region.
Article
Energy & Fuels
Mingxuan Zhou, Shifeng Dai, Xibo Wang, Lei Zhao, Victor P. Nechaev, David French, Ian T. Graham, Jintian Zheng, Yan Wang, Mengjun Dong
Summary: This paper investigates the mechanism of critical element mineralization in the coal of the Gaosheng Mine in southwestern China. The study reveals the presence of high concentrations of critical elements in the coal, which may originate from erosion and volcanic detritus. The findings have significant implications for understanding the genesis of coal and the exploitation of critical elements in coal.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Review
Geochemistry & Geophysics
Victor P. Nechaev, Frederick L. Sutherland, Eugenia Nechaeva
Summary: This study reviews the data on the Phanerozoic plume activity and the geochemistry of their igneous rocks, aiming to explore the changes in intensity and geochemistry of mantle plumes related to the Earth's evolution and galactic seasonality. The data indicate that peaks of various igneous activities, including both plume-related and subduction/collision-related magmatism, were associated with galactic summers, while significant drops in igneous activity were observed during galactic winters. The materials subducted into the transitional and lower mantle had a large influence on plume magmas during galactic summers, but were less significant in the galactic spring and autumn seasons.
Review
Geochemistry & Geophysics
Shifeng Dai, Sergey Arbuzov, Igor Yu Chekryzhov, David French, Ian Feole, Bruce C. Folkedahl, Ian T. Graham, James C. Hower, Victor P. Nechaev, Nicola J. Wagner, Robert B. Finkelman
Summary: Critical elements in coal and coal-bearing sequences have received great attention. Their enrichment in coals is generally attributed to within-plate volcanism and associated hydrothermal activity. However, Cretaceous coals are not commonly rich in critical elements, possibly due to intense igneous activity leading to acidification of terrestrial and marine waters.
Article
Geosciences, Multidisciplinary
Minglian Shen, Shifeng Dai, Victor P. Nechaev, David French, Ian T. Graham, Shande Liu, Igor Yu. Chekryzhov, Irina A. Tarasenko, Shaowei Zhang
Summary: Recent studies on the coal seams in SW China have shown changes in the provenance of water-transported sediments during the Late Permian and Early Triassic. This paper investigates the mineralogical and geochemical characteristics of the Permian coal-bearing strata in the Huopu coal deposit, revealing that the sediments were mainly sourced from the Emeishan Large Igneous Province and Paleo-Tethys convergent margins. The sedimentation in the Huopu coal deposit was controlled by tectonic activity along the Xiaojiang Fault, resulting in the deposition of clastic sediments and peat accumulation.
Article
Energy & Fuels
Yongjie Hou, Shifeng Dai, Victor P. Nechaev, Robert B. Finkelman, Hongdong Wang, Shaowei Zhang, Shaobo Di
Summary: This study investigates the mineralogy and geochemistry of coal from the Xinjing mine in the Qinshui Basin, China. The research reveals that the minerals present in the coal include kaolinite, illite, calcite, ankerite, siderite, dolomite, and pyrite. The study also identifies sediment source regions, injections of hydrothermal fluids, and seawater as the dominant influences on the geochemical and mineralogical compositions.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Energy & Fuels
Shaobo Di, Shifeng Dai, Victor P. Nechaev, David French, Ian T. Graham, Lei Zhao, Robert B. Finkelman, Hongdong Wang, Shaowei Zhang, Yongjie Hou
Summary: As a critical element, lithium has a significant role in various industries, particularly in battery storage and new energy technologies. The presence of lithium in coal has attracted attention as it could potentially serve as an alternative source. Previous studies have indicated that high lithium content in coal is associated with chlorite group minerals, primarily resulting from the action of hydrothermal solutions.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Review
Geochemistry & Geophysics
Victor P. P. Nechaev, Frederick L. L. Sutherland, Eugenia V. V. Nechaeva
Summary: This study examines the tectonic paleo-reconstructions of East Asian and western North American continental margins during the Meso-Cenozoic period, with a focus on strike-slip tectonics. It investigates the changes in Earth's rotation velocity during the Cretaceous turn of geological evolution (CTGE). The findings show a shift from sinistral shearing to dominant dextral movements on the Asian margin, and from sinistral movements to dominant dextral shearing on the American margin. These tectonic changes suggest a transition in Earth's rotation regime after CTGE, possibly linked to the redistribution of Earth's mass towards and away from the polar regions and associated ice cap melting and freezing processes.
Article
Engineering, Environmental
Zhen Wang, Shifeng Dai, Ellen A. Cowan, Matthew Dietrich, William H. Schlesinger, Qingru Wu, Mingxuan Zhou, Keith C. Seramur, Debabrata Das, Avner Vengosh
Summary: This study investigates the isotopic signatures and output rates of Pb in fly ash disposal in China, India, and the United States. It reveals that the isotopic composition of Pb in fly ash is similar to that of feed coal, allowing for easy tracing of Pb release into the environment. The disposal of Pb from fly ash in these countries has posed a significant environmental burden. Furthermore, coal fly ash contributes more to Pb accumulation than leaded gasoline in freshwater lakes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Geological
Alexander M. Panichev, Natalia Baranovskaya, Vladimir V. Aramilev, Igor Yu. Chekryzhov, Elena A. Vakh, Alena V. Vetoshkina, Tatyana N. Lutsenko, Dmitry A. Strepetov
Summary: The study aims to investigate the reasons for the use of mineralized water by wild animals and explore the chemical composition behind geophagy. The results show that animals visit the lake throughout the year and the lake water contains high concentrations of trace elements and rare earth elements, which may explain the preference for mine water consumption by animals.
BULLETIN OF THE TOMSK POLYTECHNIC UNIVERSITY-GEO ASSETS ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Bin Zhang, Jiaqi Liu, Wen Chen, Zhiliang Zhang, Li Yang, Lei Zhang, Zeyang Zhu, Chunqing Sun, Zhihao Sun
Summary: The eastern Tibetan Plateau is a region with unique topography and active tectonics, making it crucial for studying geodynamics and lithosphere-atmosphere interaction. By integrating new and reported thermochronological data, as well as paleo-crustal thickness reconstruction, this study sheds light on the tectonic deformation, climate-tectonic coupling, and geodynamics of the area.
Article
Geosciences, Multidisciplinary
Zhenhua Tian, Shangwen Zhou, Songtao Wu, Sai Xu, Junping Zhou, Jianchao Cai
Summary: This paper presents a modified method for calculating the lost gas content of shale by analyzing the coring and on-site desorption processes. The method accurately depicts the loss characteristics of free and adsorbed gas and identifies parameters that influence the calculation of in-situ shale gas content. The results demonstrate that the method shows satisfactory applicability in gas loss curve prediction and in-situ gas content estimation.
Article
Geosciences, Multidisciplinary
Pengcheng Li, Jaffar Abbas, Daniel Balsalobre-Lorente, Qingren Wang, Qianxiao Zhang, Syed Ale Raza Shah
Summary: This study explores the factors contributing to sustainability in Pakistan from 1974 to 2018 and finds that emissions from industrial and agriculture sectors have significantly decreased, while the financial sector has not effectively reduced environmental pressure. Therefore, Pakistan needs to adjust its economic policies and ensure the green allocation of financial resources.
Article
Geosciences, Multidisciplinary
Shi Zhou, Ting Zhou, Duo Guan, Yong Yao, Huimin Sun, Ahmed Ali Mosa, Yajie Zuo, Xianqiang Yin
Summary: Graphitic carbon nitride (g-C3N4) has been widely used due to its excellent optical properties and physicochemical stability. The risk of g-C3N4 transport in the environment has been overlooked, but this study investigated its transport behavior in various media. The results showed that flow rate and ionic strength influenced the transport, and the presence of lead (Pb) affected the outflow of g-C3N4. The unique structure of g-C3N4 particles allowed them to deposit in certain media and act as carriers for Pb release.
Article
Geosciences, Multidisciplinary
Xiaolong Qiao, Muntasir Murshed, Mohammad Mahtab Alam, Narasingha Das, Kurshid Khudoykulov, Salman Tariq
Summary: This study examines how macroeconomic factors influence India's carbon emission intensity levels and confirms the impact of factors such as foreign remittance receipts, energy consumption, urbanization, and technological progress. The findings provide policy recommendations for India's carbon emission reduction targets.
Article
Geosciences, Multidisciplinary
Wei Liu, Bo Wan
Summary: Magmatic-hydrothermal systems play a crucial role in transporting materials and potentially affecting Earth's long-term environment. This study investigates the duration of prograde metamorphism induced by fluid infiltration and the amount of carbon released by skarn ore deposits. The findings reveal that skarn ore deposits can efficiently decarbonize CO2 at a high rate, surpassing volcanism in different tectonic settings. The CO2 flux of skarn deposits increases over time and reaches a maximum value at the J/K boundary, providing an important previously unquantified source of outgassing in the subduction zone.
Article
Geosciences, Multidisciplinary
Haikuan Nie, Pei Li, Qing Chen, Zhijun Jin, Quanyou Liu, Wei Dang, Qian Chen, Jianghui Ding, Changbo Zhai
Summary: This study investigates the shale quality and shale gas potential in the upper Ordovician to lower Silurian formations in the Sichuan Basin of southern China. The distribution and characteristics of organic-rich shale are analyzed, aiding in the assessment of shale gas potential and identification of sweet spots.
Article
Geosciences, Multidisciplinary
Najia Saqib, Shujaat Abbas, Ilhan Ozturk, Muntasir Murshed, Malgorzata Tarczynska-Luniewska, Mohammad Mahtab Alam, Waldemar Tarczynski
Summary: This study examines the impact of economic growth, financial development, eco-friendly ICT, renewable energy, and human capital on lowering carbon footprint in the world's top polluting economies from 1993 to 2020. The findings suggest that eco-friendly ICT has the potential to effectively alleviate pollution, and financial development, renewable energy, and environmental technology are proposed as potential solutions for reducing carbon emissions.
Article
Geosciences, Multidisciplinary
Hikmat Salam, Syed Ali Turab, Asghar Ali, M. Qasim Jan, Norasiah Sulaiman, Mohd Basril Iswadi Basori
Summary: The Kahi melange complex in NW Pakistan is an important record of the tectonic evolution between the Indian plate and the Afghan block, consisting of highly dismembered ophiolitic and sedimentary units.
Article
Geosciences, Multidisciplinary
Er-Kun Xue, Wei Wang, David Chew, Manoj K. Pandit, Xin Deng, Yang Tian, Xi-Run Tong, Jun-Hong Zhao
Summary: The study reveals the presence of water-fluxed melting during the Wuyi-Yunkai Orogeny in South China. These water-fluxed melting quartzo-feldspathic migmatites formed during the early Paleozoic and were melted through reactions involving water-saturated quartz, feldspar, biotite, and K-feldspar. The findings highlight the significance of water-fluxed anatexis in the differentiation of the continental crust during orogenesis.
Article
Geosciences, Multidisciplinary
Hadi Shafaii Moghadam, Qiu-Li Li, William L. Griffin, Xian-Hua Li, Orhan Karsli, Christopher J. Spencer, Jose F. Santos, Maria Kirchenbaur, Sobhi Nasir, Suzanne Y. O'Reilly
Summary: Understanding the crustal growth, reworking, and geodynamics of the northern continental margin of Gondwana during the Ediacaran to Silurian times is crucial for the paleogeographic reconstruction of Gondwana. This study uses various analytical methods to evaluate the magmatic history of this region and obtain relevant detrital zircon data. The results provide valuable insights into the crustal evolution and tectonic activities in the northern Gondwana region.
Article
Geosciences, Multidisciplinary
Laura Petrescu, Felix Borleanu, Emanuel Kaestle, Randell Stephenson, Anica Placinta, Oleksandr Ivanovich Liashchuk
Summary: This study investigates the seismic structure of the Eastern European lithosphere and the transition from Precambrian to Phanerozoic Europe. The results show that the crust thickens across the Trans European Suture Zone boundary and the mantle is seismically faster beneath younger terranes. The Precambrian building blocks exhibit contrasting seismic fabrics, with the Baltic orogens characterized by uniform crust and the Sarmatia region showing alternating high and low velocity layers.
Article
Geosciences, Multidisciplinary
Dongya Zou, Hongfu Zhang
Summary: This study analyzes the U-Pb-Hf-O isotopes of zircons in felsic granulite xenoliths from the Fuxin late Cretaceous basalts in the North China Craton to evaluate the role of magma underplating in modifying the Archean lower crust. The results show that long-lived magma underplating occurred beneath the Fuxin region during the Mesozoic, with underplated magmas originating from the lithospheric mantle and later from the depleted asthenospheric mantle. This study concludes that magma underplating not only provided heat for remelting, but also added exotic material and weakened the lower crust, leading to its destruction.
Article
Geosciences, Multidisciplinary
Yu Han, Yingchang Cao, Chao Liang, Keyu Liu, Fang Hao
Summary: A paleoclimate reconstruction based on high-resolution records from lacustrine shale in the Bohai Bay Basin reveals a shift in orbital variability and a humidification event at -41.9 Ma in East Asia. The intensification of the East Asian monsoons at this time was likely a response to the elevated atmospheric pCO2 during the concurrent global warming.
Article
Geosciences, Multidisciplinary
Francesca Innocenzi, Sara Ronca, Stephen Foley, Samuele Agostini, Michele Lustrino
Summary: This study investigates two volcanic provinces in the western branch of the East African Rift and finds that the volcanic products show wide variability in chemical and mineralogical characteristics. Petrographic and geochemical analysis reveals enriched and heterogeneous sub-lithospheric mantle sources. The differences in isotopic features between the two volcanic provinces may indicate changes in the composition, mineralogy, and depth of melting in the lithospheric mantle source.