Article
Geosciences, Multidisciplinary
Farzaneh Shakerardakani, Franz Neubauer, Manfred Bernroider, Fritz Finger, Christoph Hauzenberger, Johann Genser, Michael Waitzinger, Behzad Monfaredi
Summary: This study reports the metamorphic conditions and evolution of the Dorud-Azna metamorphic units in the central part of the Sanandaj-Sirjan zone (SSZ), Iran. The results reveal the polyphase metamorphism in two different basement units and provide new insights into the tectonic history of the SSZ. The findings suggest the influence of rift and plate collision processes, reflecting various stages of a Wilson cycle.
GEOSCIENCE FRONTIERS
(2022)
Article
Geochemistry & Geophysics
Heriberto Rochin-Banaga, Donald W. Davis
Summary: This study examines the feasibility of using LA-ICPMS for U-Pb dating of vertebrate and invertebrate apatite fossils. The results suggest that the U-Pb system in shark teeth remains closed until the present but some teeth show anomalous ages possibly due to lead remobilization. Overall, LA-ICPMS allows for more precise absolute dating of fossils.
Article
Geosciences, Multidisciplinary
J. Vanardois, P. Trap, F. Roger, P. Goncalves, D. Marquer, J. L. Paquette, G. Siron, T. Baudin
Summary: In this study, the spatial and temporal evolution of mid-crustal flow in the Agly Massif was investigated. The results suggest that the middle crust reached high-temperature and suprasolidus conditions at ca. 325-320 Ma and was partially molten until ca. 300 Ma. The D2 thinning and top-to-the-north shearing were active from ca. 325-290 Ma.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2022)
Article
Geology
Yuce Zhang, Yongjun Shao, Qingquan Liu, Xiong Zhang, Ruoyi Wang, Zikun Yuan, Cheng Wang, Ji Sun
Summary: The Liling goldfield in NE Hunan has over 200 tons of proven gold reserves. Petrographic observations and microanalysis techniques were used to determine the age of gold mineralization in Liling. The results showed two episodes of gold mineralization during the Late Silurian-Early Devonian and Triassic intracontinental orogenies.
ORE GEOLOGY REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Zhongwu Lan
Summary: Authigenic xenotime and monazite are common in siliciclastic sedimentary rocks and can be used to determine the depositional age. Their small size and complex chemical compositions require advanced imaging and dating techniques. Integrated petrographic and geochemical studies can help distinguish their different sources.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geology
Dinh Cong Bui, Hua-Ning Qiu, Xuan Dac Ngo, Xiu-Juan Bai, Yang Wu
Summary: The study shows that tin mineralisation in Quy Hop is closely related to Late Palaeogene granites of the Ban Chieng Complex and occurred between 26 and 23 Ma. This finding has important implications for tin exploration in the Quy Hop area.
ORE GEOLOGY REVIEWS
(2022)
Article
Geochemistry & Geophysics
Takashi Yuguchi, Daichi Itoh, Tatsunori Yokoyama, Shuhei Sakata, Satoshi Suzuki, Yasuhiro Ogita, Koshi Yagi, Takumi Imura, Satoko Motai, Takeshi Ohno
Summary: In this study, a new method is proposed to study the growth of zircon in granitic plutons using three-dimensional cathodoluminescence patterns, U-Pb age, titanium concentration, and Th/U variations. The Okueyama granite in central Kyushu, Japan, was examined to understand the processes in magma chamber leading to granitic pluton formation. The three lithofacies of the granite were analyzed and the 3D internal structure and growth pattern of zircon were determined. The results revealed the distribution of different textures of zircon crystals and provided insights into the cooling history and fractional crystallization in the magma chamber.
Article
Geosciences, Multidisciplinary
Yuan-Hsi Lee, Kristen L. Cook, Xi-Bin Tan, Mei-Fei Chu, Han-Yi Chiu, Qui-Li Li, J. Gregory Shellnutt, Xi-Wei Xu
Summary: Based on the age distribution of samples from the Gongga Shan granite, it can be divided into four major groups with ages of 4-10 Ma, 12-20 Ma, 25-40 Ma, and 43-56 Ma. Combining geophysics and low-temperature thermochronology data, events younger than 10 Ma may indicate the onset of recent crustal channel flow in the middle to lower crust, while the youngest 4 Ma events suggest ongoing partial melting of the middle crust. The 12-20 Ma events could be related to an earlier stage of crustal channel flow, consistent with the regional large-scale crustal channel flow in central Tibet.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geology
Zhilin Wang, Xiong Zhang, Qingquan Liu, Yongjun Shao, Shichong Wu, Zhuo Pan, Mei Chen, Yuce Zhang, Huahao Wu
Summary: The Lishupo gold deposit in South China is an orogenic gold deposit characterized by quartz veins and altered slates. The deposit went through three stages of mineralization, with metallic minerals including pyrite and arsenopyrite. The ore-forming fluids and metals were derived from a deeper metamorphic source, indicating a typical orogenic gold mineralization process.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Yuandong Zhan, Yongjun Shao, Qingquan Liu, Xiong Zhang, Minghui Chen, Yulong Lu, Yuce Zhang, Huajie Tan
Summary: The study of the gold mineralization age of the Hengjiangchong gold deposit in the Jiangnan Orogen indicates that the late Silurian was a major epoch for gold mineralization, challenging previous claims that late Silurian hydrothermal veins are mostly ore barren.
ORE GEOLOGY REVIEWS
(2022)
Article
Geochemistry & Geophysics
M. Liesa, C. Aguilar, A. Castro, G. Gisbert, J. Reche, J. A. Munoz, M. Vila
Summary: The lower structural levels of the Variscan orogen in the Eastern Pyrenees exhibit three genetically associated magmatic suites, formed during the Late Carboniferous to Early Permian in a syn- to post-collisional setting. Geochemical comparisons with neighboring massifs suggest variable degrees of lower crustal assimilation in the granitoids and mafic complexes. Petrogenetic relationships and magma formation processes are inferred based on isotopic compositions and petrographic analysis.
Article
Geochemistry & Geophysics
Masoumeh Zare-Shooli, Zahra Tahmasbi, Songjian Ao, Hua-Feng Zhang, Adel Saki, Ahmad Ahmadi-Khalaji, Chris Yakymchuk, Rasoul Esmaeili, Orhan Karsli
Summary: Migmatites in the Boroujerd region of Western Iran are associated with felsic and mafic magmatism, with the relationship between partial melting and magmatism being unclear. U-Pb zircon geochronology was used to determine the timing of anatexis in four metapelite migmatite samples. The detrital zircons in the migmatites correspond to the Paleozoic and Mesozoic magmatism in the region, while zircon rims and neoblastic grains suggest contact metamorphism and partial melting due to Middle Jurassic magmatism.
Article
Geosciences, Multidisciplinary
Yvette D. Kuiper, Andre Michard, Etienne Ruellan, Christopher S. Holm-Denoma, James L. Crowley
Summary: The study suggests that the rocks of the Mazagan Escarpment likely have a Northwest African origin, rather than being part of an exotic Avalonian terrane.
JOURNAL OF AFRICAN EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Pavel Kotler, Sergey Khromykh, Nikolay Kruk, Min Sun, Pengfei Li, Valentin Khubanov, Dina Semenova, Alexander Vladimirov
Summary: The Kalba batholith in Eastern Kazakhstan is composed of granodiorite-granite and leucogranite rocks, formed in two different magmatic events. The granodiorite-granite rocks were produced by large-scale crustal melting, while the leucogranites originated from low-degree partial melting of deep sediments. The formation of the batholith spanned about 21 million years, with granodiorites and granites forming between 297-286 Ma and leucogranites between 288-276 Ma.
Article
Geosciences, Multidisciplinary
Chongguo He, Jianwei Li, Daniel J. Kontak, Xiaoye Jin, Yafei Wu, Hao Hu, Bo Zu, Xueling Yu, Shaorui Zhao, Shiguang Du, Yunlong Zhu, Huan Tao
Summary: The West Qinling orogen in central China, formed from continental collision between the North China and Yangtze cratons in the Late Triassic, hosts numerous gold deposits. In this study, in situ U-Pb titanite dating was used to determine the age of the Ma'anqiao gold deposit in the northern portion of the orogen. The results show that the deposit was formed at ca. 121-120 Ma, indicating that it is not related to the Triassic orogeny but rather to the thinning and destruction of the North China craton during the Late Jurassic to Early Cretaceous. The study also highlights the potential for future exploration of similar gold deposits in areas affected by Late Mesozoic magmatism.
SCIENCE CHINA-EARTH SCIENCES
(2023)
Article
Geology
F. Bea, G. Gallastegui, P. Montero, J. F. Molina, J. Scarrow, A. Cuesta, L. Gonzalez-Menendez
Summary: The central zone of the Iberian Massif is characterized by abundant granitic batholiths, including UMI rocks, which are closely related to crustal contamination. They are mainly divided into two associations: vaugnerites and appinites.
JOURNAL OF IBERIAN GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Fernando Bea, Irene Morales, Jose Francisco Molina, Pilar Montero, Aitor Cambeses
Summary: This study investigates the reasons and characteristics of zircon inheritance in granitoids, revealing the significant influence of source composition, temperature, pressure, water content, etc., on zircon survival. Mid-crustal S-type granites with high water content exhibit elevated zircon inheritance, while water-poor granites may inherit less zircon.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Geochemistry & Geophysics
Jose Francisco Molina, Aitor Cambeses, Juan Antonio Moreno, Irene Morales, Pilar Montero, Fernando Bea
Summary: This study introduces three new accurate calibrations of the amphibole-plagioclase NaSi-CaAl exchange thermometer, calculated using robust regression methods, which demonstrate higher accuracy and precision on experimental data.
AMERICAN MINERALOGIST
(2021)
Article
Geochemistry & Geophysics
Aitor Cambeses, Jose F. Molina, Irene Morales, Concepcion Lazaro, Juan A. Moreno, Pilar Montero, Fernando Bea
Summary: The Ossa-Morena Zone in SW Iberia contains Lower Carboniferous compositionally zoned plutons with alkaline, transitional, and calc-alkaline suites. A study of the Valencia del Ventoso main pluton reveals the compositional evolution of magmas during hybridization, with evidence of mixed alkaline and calc-alkaline magmas. Different facies of the pluton crystallized under varying conditions, indicating a complex magmatic history.
Article
Geochemistry & Geophysics
Ralf Halama, Gray E. Bebout, Fernando Bea
Summary: The passage discusses the distribution and storage of nitrogen in deep crustal rocks in the Ivrea Zone of the Southern Alps, highlighting changes in nitrogen concentrations and isotopic compositions with increasing metamorphic grade. It reveals that nitrogen is redistributed among silicate phases during devolatilization and melting, showing a strong affinity for certain potassic minerals.
Article
Geology
A. Cambeses, A. Garcia-Casco, J. F. Molina, P. Montero, S. Basak, I. Morales, F. Bea
Summary: The study of calc-alkaline lamprophyres and minettes from Zeneta, SE Spain Neogene Volcanic Province reveals a hybrid nature involving mantle-derived alkaline lamproitic and continental crust-derived granitic parental magmas. Interaction and mixing of these compositionally contrasted magmas resulted in the formation of hybrid calc-alkaline lamprophyre minette. The identification of mixing and fractionation processes in calc-alkaline minettes genesis opens a new scenario to be considered in understanding the petrogenesis of these rocks.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Chemistry, Multidisciplinary
Irene Morales, Jose F. Molina, Aitor Cambeses, Pilar Montero, Fernando Bea
Summary: This study simulates the process of recrystallization and mineral dissolution in zircon under high-temperature conditions. It shows that zircon can undergo element migration and mineral dissolution, forming new mineral phases. Highly metamict zircons lost common lead and some radiogenic lead during thermal annealing, which is significant for zircon dating.
ACS EARTH AND SPACE CHEMISTRY
(2022)
Article
Geochemistry & Geophysics
Aitor Cambeses, Sumit Chakraborty, Niels Jons, Pilar Montero, Fernando Bea
Summary: Inherited zircons found in mantle-derived rocks are important for understanding the history and processes of these rocks. However, the presence of inherited zircons in mafic igneous rocks is puzzling because zircon is expected to dissolve quickly in the presence of mafic melts. Through experiments, it has been found that if the melt occurs in narrow and restricted domains around zircon grains, the melt gets saturated with Zr, acting as a protective layer and preventing further dissolution. These findings have implications for the mode of melt transfer in mantle segments and the survival of zircons in partially molten mantle systems.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Razieh Chaharlang, Jalil Ghalamghash, Yu Saitoh, Mihai N. N. Ducea, Axel K. K. Schmitt
Summary: Late Miocene-Quaternary adakitic rocks are widely distributed in northwestern Iran and are believed to have formed after a slab break-off event at around 10 million years ago. The Sabalan adakitic rocks in northwest Iran show near-identical Sr-Nd isotopic characteristics, indicating that they were mainly generated by melting of juvenile intrusions in the lower crust. The delay between the slab break-off and magmatic activity suggests that the melting was triggered by asthenospheric melting underneath the Turkish-Iranian Plateau. It is proposed that the detached slab heated up in the mantle, causing dehydration and subsequent ascent of fluids that lowered the mantle viscosity, leading to partial melting of lower crustal rocks and the generation of adakitic magmas.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Aboubaker Farah, Andre Michard, Omar Saddiqi, Ahmed Chalouan, Christian Chopin, Pilar Montero, Michel Corsini, Fernando Bea
Summary: This study provides new insights on the exhumation of subcontinental peridotites in the Gibraltar Arc through mapping, structural and petrological analyses, and SHRIMP U-Th-Pb dating of high-grade marbles in northern Rif, Morocco. The Beni Bousera marbles (BBMs) are found to form dismembered units within mylonitic contacts between kinzigites and gneisses, displaying peak HT-LP metamorphic conditions and U-Th-Pb age clusters of 270 Ma and 340 Ma. This study highlights correlations with other Alpine belts in the West Mediterranean region and suggests a link between the exhumation of Beni Bousera mantle rocks and the early rifting events of the Maghrebian Tethys.
BSGF-EARTH SCIENCES BULLETIN
(2021)
Review
Geosciences, Multidisciplinary
Fuquan Yang, Xinxia Geng, Zhixin Zhang, Guoren Liu, Hanqing Zhang
Summary: Northern Xinjiang in China is an important part of the Central Asian Orogenic Belt, characterized by multiple episodes and types of mineralization. Cu and Au deposits are mostly found in Altay, Junggar, and Tianshan, with minor occurrences in Beishan. The most common types of Cu-Au deposits are volcanogenic and porphyry deposits. The formation of Cu-Au deposits can be divided into five mineralization episodes, with the Devonian and Carboniferous being the main periods. These deposits developed in various tectonic settings, including island arc, continental arc, collision, and postcollisional extensional tectonics.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Jiang Zhu, Dan-yang Liu, Chao Chen, Song Chen, Yuan-bing Zou, Leonid Danyushevsky, Jing-meng Huang, Xiang-wei Tang
Summary: Numerous lode gold and silver deposits have been discovered in orogenic belts in China. This study focuses on the formation and fluid evolutions of the super-large Yingdongpo gold and giant Poshan silver deposits in the Tongbai-Dabie orogen. The results suggest that both deposits were formed concurrently with Early Cretaceous granitic magmatism and the ore-forming fluids were primarily of magmatic origin with meteoric water inputting. The gold mineralization is related to a change in the physicochemical properties of the fluids, while the silver mineralization is favored by progressive deposition of sulfides in a slowly cooling hydrothermal system.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Arun Bhadran, B. P. Duarah, Drishya Girishbai, Mohammad Atif Raza, Avi Mero, Sandeep Lahon, A. L. Achu, Girish Gopinath
Summary: The Brahmaputra foreland basin, known for its dynamic tectonism and sediment load, exhibits a variety of seismically generated soft sediment deformation structures (SSDS) such as clastic dikes, sand sills, and micro-faults. These structures, influenced by multiple strong seismic events, are characterized by their dimensions, intrusion angles, cross-cutting relations, wall shattering, and age. The study suggests that a significant earthquake with high intensity and magnitude might have caused liquefaction features in the area. The findings highlight the importance of studying SSDS in tectonically active regions with limited surface ruptures and dense alluvial cover.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Huan Wang, Lirong Dou, Xingyang Zhang, Jiquan Yin, Beiwei Luo, Haigang Duan, Peiguang Yang, Yifan Song
Summary: Quantitative analysis of sediment composition and microfacies helped identify changes in facies belts in the Cretaceous Mishrif Formation. The study demonstrated the importance of carbonate microfacies quantification and its implications for paleogeographic research.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Boran Wang, Zhilong Huang, Dongsheng Xiao, Haiyue Yu, Wenren Zeng, Xin Wang, Tong Qu, Zhiyuan Li, Yizhuo Yang
Summary: By systematically analyzing the source rocks of the Sangonghe Formation in the Taibei Sag, NW China, and using kerogen kinetics modeling, this study reveals the influence of geological conditions on hydrocarbon generation and expulsion. The source rocks in different environments show distinct geochemical characteristics and hydrocarbon generation potential.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Haiying Yang, Zhifang Zhao, Haifeng Fan, Min Zeng, Jiafei Xiao, Xiqiang Liu, Shengwei Wu, Jiangqin Chao, Yong Xia
Summary: This paper investigates the REE enrichment and the role of Fe/Mn (oxyhydr)oxides in marine phosphorites from the early Cambrian period in South China. The study reveals that Fe/Mn (oxyhydr)oxides play a crucial role in REE enrichment and are controlled by Fe-redox pumping.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Qing Li, Hongbin Wang, Feng Cai, Di Luo, Fanxing Kong, Ang Li, Xiting Liu
Summary: The elemental and isotopic compositions and abundance of carbonates in marine sediments are used to reconstruct ancient climate and ocean conditions. This study analyzed sediment samples from the Okinawa Trough to examine the relationship between carbonates' compositions and methane seepage and sea-level changes. The results indicate that both biogenic and authigenic carbonates are important factors in understanding paleoclimate and paleoceanography.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Maryam Akbarzadeh Aghdam, Abdolreza Ghods, Farhad Sobouti, Khalil Motaghi, Keith Priestley, Mohammad Enayat
Summary: The Makran subduction zone is difficult to monitor due to limited seismic activity, but a temporary seismic network was installed to investigate the relationship between different regions and detect seismicity. The observed seismicity suggests the presence of structural boundaries and seismically inactive areas.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Zhen-Yu Wang, Hong-Rui Fan, Hai-Dong She, Kui-Feng Yang
Summary: This study conducted detailed geochemical, geochronological and isotopic analyses on the Songxian syenite in the Qinling Orogen. The results revealed the magma sources, petrogenesis and geodynamic implications of this alkaline intrusion. The study suggests that the syenite was formed through multiple stages of magmatism, involving the partial melting of the enriched lithospheric mantle and mixing with melts derived from the lower crust.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Yu Li, Wen-Liang Xu, Xiao-Ming Zhang, Jie Tang
Summary: This study presents new zircon U-Pb-Hf and whole-rock geochemical data for Jurassic intrusive rocks in the Yanbian area of NE China, providing insights into the subduction history of the Paleo-Pacific Plate. The study reveals three stages of Jurassic magmatism in the area, indicating the presence of an active continental margin related to the initial subduction of the Paleo-Pacific Plate beneath the Eurasian continent.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Lina Ai, Shengfa Liu, Shuai Cong, Hui Zhang, Peng Cao, Kaikai Wu, Wenxing Ye, Che Abd Rahim Mohamed, Xuefa Shi
Summary: This study investigates the depositional configurations and sedimentary environments of the Malacca Strait through analyzing grain size characteristics and hydrographic data. The results show that residual sediments are concentrated in the central region, while modern terrigenous sediments are distributed along the coast of Malaysia and the northern region. The sedimentary environments are influenced by seasonal variations and hydrodynamic conditions.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Liang Xiao, Jia-qi Liang, Li-yan Guo, De-shuang Ji, Man Yuan, Xiang-chuan Li, Nan Sun, Zuo-chen Li
Summary: This study investigates the correlation between stable carbon isotopes of plant fossils and CO2 levels in the Jurassic period. The results suggest a weak correlation between the two, indicating caution is needed when using stable carbon isotopes to reconstruct high paleo-CO2 concentrations.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Xuli Yang, Feng Huang, Jifeng Xu, Xijun Liu, Liying Zhang, Zhao Zhang, Benyan Xu, Man Zhang, Yunchuan Zeng, Qian Liu, Mingda Lv
Summary: The extensively developed Early Cretaceous intermediate-felsic rocks in the northern North China Craton provide valuable insights into the nature of Paleo-Pacific subduction and associated geodynamic processes. Geochemical and geochronological analyses of trachyandesites and rhyolites from the eastern Hebei, northern NCC suggest that the trachyandesites likely originated from enriched mafic lower crust and the rhyolites are derived from the trachyandesitic magmas through fractional crystallization. The migration direction change of these rocks is believed to be primarily attributed to slab rollback of the subducting Paleo-Pacific Plate.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Wei Liu, Ping Gao, Xianming Xiao, Yanming Zhao, Yijie Xing, Jinku Li
Summary: The organic-rich shales of the Shuijingtuo Formation in China are an important target for shale gas exploration. The upper section of the formation, primarily consisting of limestone, silty shale, and black shale, has been rarely studied but recently showed promising results for shale gas exploration. Geochemical investigations of the upper section shale deposits revealed that the organic matter enrichment mechanism underwent dynamic changes due to relative sea-level changes and episodic upwelling activities.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Xin Wang, Chen Zhang, Zixin Xue, Qianyou Wang, Zhenxue Jiang, Kun Zhang, Xiangye Kong
Summary: This study analyzed the heterogeneity of gas compositions and the effects of magmatism on gas accumulation in shale gas exploration in the Yangtze plate. The results showed that magmatism caused the development of micro-fractures in shale reservoirs and accelerated the thermal evolution rate of organic matter. The impact of magmatism on shale gas accumulation varied in different regions, either favoring or compromising efficient gas accumulation in shale reservoirs.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)