Article
Geosciences, Multidisciplinary
Sibin Sebastian, Rajneesh Bhutani, Srinivasan Balakrishnan, Joseph Kallukalam Tomson, Anil Dutt Shukla
Summary: The Neoarchean potassic granite from the Hosadurga region adjacent to the Chitradurga greenstone belt has been studied for its petrogenesis, revealing that these rocks involve Archean crustal sources and partial melting of TTG source to form the granite. The involvement of a mafic source formed as early as around 3.8 Ga is indicated by the high Nd isotope ratios in TTG samples.
GEOLOGICAL JOURNAL
(2021)
Article
Geochemistry & Geophysics
Yuanku Meng, Jian Chen, Xin Wang, Zhenzhen Wang, Wei Xin, Qingling Wang, Haoqi Yuan
Summary: This study presents data on the microstructure, mineralogy, geochemistry, and isotopes of a Late Neoarchean granodiorite pluton and associated mafic microgranular enclaves (MMEs) in western Shandong Province, China. The study reveals different mineral and geochemical characteristics of the pluton and MMEs, indicating a different magma mingling process and crust-mantle interaction. The dating and isotopic analysis suggest a close relationship between the rock formation and the development of plate tectonics in the Late Neoarchean of the North China Craton.
Article
Geosciences, Multidisciplinary
Zhen-Xin Li, Shao-Bing Zhang, Yong-Fei Zheng, John M. Hanchar, Peng Gao, Yi-Ming Lu, Ke Su, Fang-Yuan Sun, Ting Liang
Summary: The lithosphere of the Earth underwent significant changes during the Neoarchean era, with the crust becoming more felsic and the composition of granitoids diversifying. Research indicates that sodic TTGs and K-rich granitoids in this period were derived from partial melting at different depths, linked through both similarities and differences in their source compositions.
PRECAMBRIAN RESEARCH
(2021)
Article
Geochemistry & Geophysics
Yanyan Zhou, Qianying Sun, Yali Zheng, Taiping Zhao, Mingguo Zhai
Summary: Numerous studies have shown that significant geologic and geochemical transitions occurred between around 3.2 billion years ago and 2.5 billion years ago. The influential Neoarchean tectono-thermal event at around 2.70 billion years ago led to the formation of mafic-felsic magmatic rocks indicating widespread crustal accretion. This study in the North China Craton confirms the presence of early Neoarchean TTG and potassic granite association, with detailed characterization based on their geochemical features.
Article
Geochemistry & Geophysics
M. A. D. Silva, L. V. S. Monteiro, T. J. S. Santos, C. P. N. Moreto, S. D. Sousa, J. M. Faustinoni, G. H. C. Melo, R. P. Xavier, B. A. M. Toledo
Summary: In the Carajás Domain, the oldest units include migmatites affected by early dehydration and late water-fluxed partial melting. These processes resulted in the formation of different rocks with varying structures and compositions, revealing key periods in crustal evolution and the formation of continental crust.
Article
Geochemistry & Geophysics
Ruiying Zhang, Mingguo Zhai, Yan Zhao
Summary: The petrogenesis of tonalite-trondhjemite-granodiorite (TTG) suites in the Zhongtiao Mountains of the North China Craton provides important clues for understanding the formation and evolution of continental crust. Through the investigation of two episodes of TTG gneisses in the Neoarchean period, it is revealed that these gneisses share similar geochemical features with Archean TTGs and Phanerozoic high-SiO2 adakites, indicating a partial melting of mafic rocks. The different characteristics of these TTGs suggest different geodynamic processes, possibly related to subduction and thickened lower crust.
Article
Geochemistry & Geophysics
Peng Liou, Zaicong Wang, Ross N. Mitchell, Luc S. Doucet, Ming Li, Jinghui Guo, Mingguo Zhai
Summary: This study reveals the petrogenesis of high-pressure rocks in the North China craton through iron isotopic analysis. The results suggest that the high-pressure features in trondhjemites are actually formed by amphibole-dominated fractionation at low pressure, while tonalites are unlikely to be formed within the garnet stability range at high pressure.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Yang Yu, Dapeng Li, Yuelong Chen, Jian Sun, Jianzhen Geng, Fan Yang, Yubing Han
Summary: Magmatic rocks in the Western Shandong Complex provide key information on the pre-plate tectonic crustal-mantle interactions during the early Neoarchean, including the transition from vertical to lateral tectonic processes and the identification of a continental nucleus.
PRECAMBRIAN RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Qi-Qi Zhang, Shuan-Hong Zhang, Yue Zhao, Guo-Hui Hu
Summary: The research focuses on the Neoarchean rocks in the Jiefangyingzi area, analyzing their formation processes, geological characteristics, and the geological relations between the Jiefangyingzi area, the northern North China Craton, and the Central Asian Orogenic Belt. The study suggests that the Jiefangyingzi area has a tectonic affinity with the Eastern Block of the NCC, and provides insights into the crustal growth and reworking processes in the region.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Yalu Hu, Shuwen Liu, Jinghao Fu, Guozheng Sun, Lei Gao, Rongrong Guo
Summary: The Hengshan Terrane in the central North China Craton features Neoarchean-early Paleoproterozoic granitoid rocks. Various geological events and types of granitoid rocks have been identified in this region, indicating a complex history of magmatism and metamorphism. The presence of calc-alkaline volcanic rocks in the adjacent area suggests a possible geodynamic regime of slab subduction during the late Neoarchean period.
Article
Geosciences, Multidisciplinary
Changquan Cheng, Jin Liu, Jian Zhang, Ying Chen, Changqing Yin, Xiaoguang Liu, Jiahui Qian, Peng Gao, Xiao Wang
Summary: The discovery of ca. 2.7 Ga tonalite-trondhjemite-granodiorite (TTG) in the North China Craton (NCC) provides crucial evidence for understanding Neoarchean crustal evolution. This study presents new constraints on crustal growth and reworking during the Neoarchean through the mapping of ca. 2.7 Ga TTGs, associated ca. 2.6-2.5 Ga high-K granites and high-Mg diorites in the northern Qingyuan region of NCC. Zircon U-Pb dating reveals their formation ages and geochemical analyses suggest different origins for each lithology. Combined with previous studies, it is evident that the northeastern NCC experienced two major periods of crustal growth and reworking around ca. 2.7 Ga and ca. 2.6-2.5 Ga.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Sibin Sebastian, Rajneesh Bhutani, S. Balakrishnan, J. K. Tomson
Summary: The granitoid magmatism in the Chitradurga greenstone belt suggests crustal reworking in the western Dharwar Craton. Petrogenesis of high-K granites and low-K trondhjemites was studied using whole-rock elemental and Nd isotopic compositions, revealing partial reworking of older crust. Different crustal source rocks underwent partial melting at different crustal levels, indicating a reworking event likely triggered by mafic underplating and water-dominated fluid flux.
Article
Geosciences, Multidisciplinary
Zhongshui Li, Xuanlong Shan, Jin Liu, Jian Zhang, Zhenghong Liu, Changquan Cheng, Zhigao Wang, Chen Zhao, Hongchao Yu
Summary: This study investigates the petrogenesis and tectonic implications of late Neoarchean TGGs and associated monzogranites. The results suggest that the TTGs were likely generated by partial melting of 2.9-2.7 Ga juvenile basalts, and the monzogranites may have been derived through the partial melting of thickened lower crust with heterogeneous sources. The Late Neoarchean thickened lower crust was the likely geodynamic setting for the formation of the TTGs and monzogranites.
Article
Geosciences, Multidisciplinary
Jin Liu, Jian Zhang, Zhenghong Liu, Xiaoguang Liu, Changquan Cheng, Zhigao Wang, Chen Zhao, Hongchao Yu
Summary: This paper presents a systematic study on the petrogenesis of recently discovered Mesoarchean rocks in the North China Craton (NCC) and provides insights into the regional tectonic setting. The results indicate that the rocks were formed through partial melting of ancient rocks and experienced crustal growth and recycling involving crustal contamination.
PRECAMBRIAN RESEARCH
(2022)
Article
Geochemistry & Geophysics
Jiahui Zhang, Dan Wang, Jinghui Guo, Yunwei Ren, Hui Tian, Huichu Wang, Xin Tong, Yipeng Zhang, Jianrong Shi, Qingsong Chang, Zhenqun Xiang
Summary: The study investigates the petrogenesis, geochronology, and isotopic signatures of Neoarchean granitoids from the Huai'an Complex in the North China Craton. The results suggest that these rocks formed through crust-mantle interaction and continental crust evolution. The diverse geochemistry of these granitoids is controlled by their source compositions, magmatic mixture, and accumulation processes. The findings contribute to our understanding of the geodynamic processes and origin of continental crust during the Late Neoarchean-Early Paleoproterozoic.
Article
Geosciences, Multidisciplinary
V Aneeshkumar, G. K. Indu, M. Santosh, S. James, Saranya R. Chandran, Devika Padmakumar, K. S. Sajinkumar
Summary: Using a plate tectonic reconstruction model, this study tracks the movement of lithospheric plates by analyzing the ancient positions and velocities of impact craters, and correlates them with global tectonic events.
GEOLOGICAL JOURNAL
(2022)
Article
Geosciences, Multidisciplinary
Pengsheng Dong, Guochen Dong, M. Santosh, Xuanxue Mo, Zhuanrong Sun, Yanick Blaise Ketchaya, Yanning Pan, Yanick Brice Lemdjou
Summary: Granitoids are essential components of the Earth's continental crust and offer valuable insights into the evolution of the crust and associated mineral resources. This study focuses on the Lailishan pluton in the Tengchong Block and investigates its petrogenesis and tectonic implications through various analytical techniques. The results reveal that the pluton consists of different types of granitoids and microgranitoid enclaves. The age of rock formation is estimated to be around 54-52 Ma. Petrological and isotopic analyses suggest that the monzogranite and syenogranite were derived from the partial melting of metabasaltic rocks in the Gaoligong metamorphic basement. The enrichment of certain elements in the syenogranite can be attributed to fractional crystallization. Furthermore, the presence of igneous textures and compositional zoning in the microgranitoid enclaves suggests a magma mixing and mingling process. The diabase dyke intrusion is considered to be derived from a metasomatized lithospheric mantle. The study proposes that the interaction between crustal and mantle-derived magmas, facilitated by slab rollback of the Neo-Tethys Ocean, resulted in a significant magmatic activity during the Eocene period in the Tengchong Block.
Editorial Material
Geology
Qingfei Wang, Jun Deng, Liqiang Yang, M. Santosh
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Hengxu Li, Zhaochong Zhang, Bingxiang Liu, Yilun Jin, M. Santosh, Junyi Pan
Summary: The Awulale metallogenic belt in China is an important source of SVIO deposits, and the Dunde deposit within this belt contains significant zinc and gold resources. By studying fluid inclusions in sphalerite, it was determined that the ore-forming fluid originated from magmatic sources, rather than other mineralization processes related to iron deposits. This suggests that the zinc and gold mineralization in the Dunde deposit occurred during hydrothermal alteration caused by granitic intrusions.
ORE GEOLOGY REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
ZhongJie Shen, M. Santosh, Alireza Arabameri
Summary: Land subsidence is a challenging geo-hazard caused by overexploitation of groundwater and underground cavity collapse. Predicting and mitigating this hazard is difficult due to limitations in monitoring and knowledge. Remote sensing and GPS can help locate and map subsidence, but proper susceptibility maps are generally lacking. Machine learning techniques show promise in preparing these maps, and their application can help prevent natural and human catastrophes and reduce economic losses.
GEOLOGICAL JOURNAL
(2023)
Article
Geosciences, Multidisciplinary
Jiahao Chen, Qingfei Wang, M. Santosh, Long Qiao, Tingyi Wang, Yanning Wang, Qizuan Zhang
Summary: Detrital zircon analysis and thermochronology were conducted to study the plate boundary dynamics and basin sedimentation in the southwestern South China Block. Results indicate different provenances and tectonic events during the Early and Middle Triassic, with the turbidite system being primarily controlled by Palaeo-Pacific subduction in the Early Triassic and experiencing the impact of both Palaeo-Pacific subduction and Indochina Block collision in the Middle Triassic.
GEOLOGICAL JOURNAL
(2023)
Article
Geosciences, Multidisciplinary
Raja Sen, Dibyashakti Panda, Bhaskar Kundu, M. Santosh
Summary: Using data from geodetic measurements and tomography, we propose that the Narmada-Son palaeo-rift is a current diffuse plate boundary that divides the Indian composite plate into two component plates. The collision of the South-Indian plate with the Narmada-Son boundary acts as a pivot point, causing torque and mechanical rotation. Our model aligns with the estimated relative Euler pole positions and explains the Indian composite plate hypothesis, topographic diversity along the rift, and deformation styles across the diffuse plate boundary.
GEOLOGICAL JOURNAL
(2023)
Article
Geosciences, Multidisciplinary
Hengxu Li, Zhaochong Zhang, Bingxiang Liu, Yilun Jin, M. Santosh
Summary: Multiple types of deposits can form from a single magmatic-hydrothermal system. Identification of the link among different styles of deposits is crucial for understanding the evolution of magmatic-hydrothermal systems and exploring for ore deposits.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
Shili Han, Sheng Wang, Xianzhe Duan, M. Santosh, Sai Li, Haoran Sun, Zhenping Tang, Kaixuan Tan, San Liu, Liang Chen, Aiyang Ma, Shuqin Long, Wei Liu
Summary: This study presents a systematic investigation on the mineralogical and geochemical characteristics of the Jilinbaolige Pb-Zn-Ag polymetallic deposit. The results suggest that the sulfides in the deposit are closely related to magmatic-hydrothermal activity and originated from a mix of mantle and crustal sources. The comparison with other deposits in the region indicates a similar metallogenic source, which is associated with Yanshanian granite and medium-temperature hydrothermal fluids.
Article
Geosciences, Multidisciplinary
Zheng Ji, Wen-Chun Ge, M. Santosh, Chuan-Biao Wan, Yan-Long Zhang, Jun-Hui Bi, Hao Yang, Yu Dong, Yan Jing
Summary: The closure of the Paleo-Asian Ocean along the Solonker Suture in the Central Asian Orogenic Belt is investigated. The rocks in the area show characteristics of subduction-related processes and partial melting of the mantle. The tectonic evolution of the region involves double-sided subduction, soft collision, and post-collisional extension.
GEOSCIENCE FRONTIERS
(2023)
Article
Geochemistry & Geophysics
Ruixuan Zhang, Zhiguo Cheng, Zhaochong Zhang, Zhen Chen, Richard Ernst, M. Santosh
Summary: This study applies machine learning methods to global datasets of basalts to investigate the role of fluids in the formation of large igneous provinces (LIPs). The results show that the basalts of Tarim LIP in northwestern China exhibit a spatial decrease in their island arc affinity from northeast to southwest, suggesting the influence of fluids released from earlier southward oceanic subduction. Temporally, the decline in fluid activity from 290 Ma basalts to 270 Ma mafic dykes indicates a decrease in fusible components in the mantle source and the generation of a strengthened lithosphere. This study provides new insights into the crucial role of fluids in LIP generation, particularly those associated with ancient subducted slabs.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Dingying Yang, Xi Jiang, Alireza Arabameri, M. Santosh, Johnbosco C. Egbueri
Summary: This study investigates the influence of sample size on the precision of landslide susceptibility modelling using a machine learning methodology. The researchers find that increasing the sample size improves the accuracy of the models and highlight the reliability of a multi-scenario strategy. The findings have important implications for land-use planning and catastrophe risk management.
GEOLOGICAL JOURNAL
(2023)
Article
Geosciences, Multidisciplinary
Yang Wang, Yongfeng Gao, Shengchuan Xu, M. Santosh, Tianjia Jiao
Summary: The Chagan Obo shear zone in central Inner Mongolia is important for understanding the convergence between the North China-Mongolia and Siberia continents. Three deformation zones were identified within the shear zone, and their structural and kinematic characteristics were investigated. Shear indicators such as foliations, mica fish, sigma-type structures, and asymmetric folds suggest thrusting through compression. Muscovite ages indicate that the convergence lasted from Late Jurassic to Early Cretaceous. Shoshonitic volcanism and rift basins in the region indicate orogenic collapse in the eastern Central Asian Orogenic Belt.
GEOLOGICAL JOURNAL
(2023)
Article
Geosciences, Multidisciplinary
Weidong Ren, Fan Yang, Zesheng Qian, Chao Liu, Xinyuan Li, M. Santosh, Fei Xue
Summary: The Shibaogou and Laojunshan plutons in the Luanchuan region, China, are high heat production granites linked to I-, A-, and partly S- type granitoids, aiding in the formation of associated polymetallic deposits. The RHP values of granitoids in the region vary from 1.7 to 14.44, with higher values correlated to higher magma differentiation. These high RHP value intrusions show genetic links with high economic deposits. The RHP contour mapping also identifies potential zones for Mo-W exploration.
GEOLOGICAL JOURNAL
(2023)
Article
Geosciences, Multidisciplinary
Han-Hui Wang, Li Tang, M. Santosh, Li-Hui Jia, Tao Zeng, Yuan-Ming Sheng
Summary: In this study, garnet amphibolites from the Wanzi Group in the Fuping Complex along the Trans-North China Orogen (TNCO) were investigated. Petrological features and phase equilibrium modelling revealed a sequential increase in pressure and temperature during the metamorphic process. Zircon U-Pb dating showed that the garnet amphibolites experienced a long-lived post-peak decompression and cooling process during 1.90-1.76 Ga, leading to the final assembly of the North China Craton.
GEOLOGICAL JOURNAL
(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.
