Article
Geochemistry & Geophysics
Birger Rasmussen, Jian-Wei Zi, Janet R. Muhling
Summary: Tectonic fluid expulsion in permeable foreland basin sequences has been examined, and it has been discovered that fluids migrate through low-permeability successions. U-Pb data from the Hamersley region in Australia indicate that fluids expelled during tectonic compression migrated through older shales by fracture permeability and enhanced diffusion. The timing of veining was not random, but coincided with major orogenic events, linking fluid overpressure and hydraulic fracturing to the expulsion of heated orogenic fluids. These findings provide insight into fluid flow in geological processes.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
Camila Pineda, Axel K. Schmitt, Diego Morata
Summary: Zircon is a widely studied mineral for geochronology, and its Th/U ratios play a critical role in isochron dating and radiometric age correction. However, the processes causing Th/U variations in zircon crystals are not fully understood. This study presents new data on the Th/U ratios and ages of zircon from a volcanic eruption in central Chile, providing important insights into the factors influencing Th/U ratios in zircon.
Article
Geosciences, Multidisciplinary
Min Gao, Zhen-Jie Zhang, Qiu-Ming Cheng, Djordje Grujic
Summary: The Huai'an Complex in the North China Craton consists of TTG gneisses and granite intrusive bodies. Zircon U-Pb ages reveal three episodes of magmatism from 2.6-2.3 Ga, 2.0-1.7 Ga, and similar ages around 2.3-2.0 Ga, indicating different magma sources. The complex underwent crustal growth and reworking stages from 3.1-2.5 Ga to 1.95-1.7 Ga, with tectonic processes of compression-extension-compression during 2.6-1.7 Ga.
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
Geochemistry & Geophysics
Zhenjun Sun, Guanghu Liu, Yunsheng Ren, Xi Chen, Xinhao Sun, Chengyang Wang, Zuowu Li
Summary: This study investigates the age, genesis, and tectonic setting of the Sayashk tin deposit in the Eastern Junggar region of Xinjiang Province. The results show that the deposit is closely related to granite porphyry and medium-fine-grained granite and formed in a post-collision extensional tectonic setting after the late Carboniferous.
Article
Geology
Bo Xie, Hao Song, Shiwei Song, Fei Ren, Shengqing Xiong, Yonghong Fan, Qi Li, Chengjiang Zhang
Summary: The study presents new data on the Cuojiaoma batholith in the Yidun Terrane of southwestern China, providing insights into its rock composition, ages, and mineralization potential, which contributes to understanding the geological evolution of the region.
ORE GEOLOGY REVIEWS
(2022)
Article
Geochemistry & Geophysics
Adam R. Nordsvan, Silvia Volante, William J. Collins, Amaury Pourteau, Jiangyu Li, Ian W. Withnall, Simon Beams, Zheng-Xiang Li
Summary: The study examines the magmatic activity in NE Australia during the late stages of Nuna amalgamation, revealing an increase in mantle input towards the west and suggesting progressive lithospheric thinning of the crust.
Article
Geology
Tao Wu, Yaqin Luo, Kongyang Zhu, Qinglong Lin, Yan Zhang, Zilong Li
Summary: This study presents new zircon ages and Lu-Hf isotopes of felsic volcanic rocks in southeastern Zhejiang Province, revealing their petrogenesis and tectonic background. The distribution of volcanic rocks in the province is found to be correlated with time and juvenile components in the source region. The results support the episodic roll-back of the Palaeo-Pacific plate model and refute the hypothesis of a large volume eruption over a short interval of time.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Qingyun Li, Lifei Zhang, Xu Chu, Guibin Zhang, Thomas Bader, Yang Wang, Chenguang Wu
Summary: This study provides detailed insights into the metamorphic evolution and tectonic history of the HP pelitic granulites associated with eclogites from the Kharta Gneiss in the central Himalaya, shedding light on the overall evolution of the Himalayan orogeny.
Article
Geochemistry & Geophysics
EmilyE. Zawacki, Matthijs C. van soest, Kip V. Hodges, Jennifer J. Scott, Melanie Barboni, Manfred R. Strecker, Craig S. Feibel, Christopher J. Campisano, J. Ramon Arrowsmith
Summary: Detrital zircons from two major rift basins in the East African Rift System are analyzed to understand sediment provenance, landscape dynamics, and the volcanic evolution of the rift system. The results show that the sediments mainly come from silicic volcanic rocks, and the zircon ages correspond to the timing of rift activity. The discrepancy between (U-Th)/He and U/Pb ages of zircons may be related to late volcanic and/or hydrothermal activity.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Roberto Maldonado, Luigi Solari, Peter Schaaf, Bodo Weber
Summary: The Cretaceous continental eclogites of the Guatemala Suture Zone provide a comprehensive record of over 1.1 billion years. Through various methods, the origin of the eclogite protoliths has been determined. The precursors of these rocks originated in convergent, within-plate, and continental rift settings, with some formed in an extensional arc setting. This geological record reveals extensional magmatism, intraplate magmatism, continental breakup, and Middle Jurassic rifting in the region.
Article
Geosciences, Multidisciplinary
Zhongwu Lan, S. K. Pandey, Shujing Zhang, Mukund Sharma, Yuya Gao, Shitou Wu
Summary: Integrated detrital zircon U-Pb and Lu-Hf isotope analyses in sedimentary rocks from central India reveal different age groupings of zircon grains, which match well with exposed magmatic and metamorphic rock components in the Northern India Block, providing crucial insights into crustal growth and plate tectonics evolution.
PRECAMBRIAN RESEARCH
(2021)
Article
Geochemistry & Geophysics
Yanick Brice Lemdjou, Huan Li, Scott A. Whattam, Kevin Igor Azeuda Ndonfack, De Pesquidoux I. Tchato Tchaptchet, Yanick Blaise Ketchaya, Jonathan Atuquaye Quaye, Franck Wilfried Nguimatsia Dongmo
Summary: The Ouaden, Doumba Bello, and Ngoura granitic plutons in eastern Cameroon are part of the Central African Fold Belt. They formed during a late-subduction early-collision setting by mixing of mantle- and crust-derived melts. The study indicates that these plutons were emplaced at around 640 Ma and were derived from partial melting of Paleoproterozoic crust.
Article
Geology
Cem Yucel, Emre Aydincakir, Abdullah Kaygusuz, Mehmet Arslan, Keewook Yi, Youn-Joong Jeong, Derya Cicerali
Summary: The Late Cretaceous magmatic activity in the Eastern Pontides Orogenic Belt of NE Turkey was characterized by the intrusion of I-type and A-type plutons. A-type plutons from the Sebinkarahisar area, with ages of approximately 77.36 +/- 0.96 Ma, display characteristics of enrichment in K2O and Na2O, Ga, Zr, and strong negative Eu anomalies. These plutons were formed in an extensional tectonic environment and were sourced from a metasomatized lithospheric mantle and juvenile crust.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Xin Dong, Zeming Zhang, Zuolin Tian, Yaoling Niu, Liangliang Zhang
Summary: The high-pressure eclogites in the central Himalaya provide insights into the metamorphism and exhumation history of crustal material beneath the Tibetan plateau. Through the analysis of zircon and titanite U-Pb ages, bulk-rock and mineral compositions, and zircon Hf isotope data, the study reveals the evolution of these eclogites, from peak HP eclogite-facies metamorphism to later retrograde metamorphism. The findings suggest a long-lived burial and slow exhumation process of the Indian continental crust since the initial Indo-Asia collision at around 55 Ma.
Review
Geosciences, Multidisciplinary
Santanu Kumar Bhowmik, Aliba Ao, Mayashri Rajkakati
Summary: This study reviewed metamorphic and geochronological data of high-pressure metamorphic rocks from the Nagaland Ophiolite Complex in North-east India and placed them in the tectonic framework of two temporally separate subduction systems. It analyzed metamorphic zonation, facies, and evolutionary paths, linking them to Late Triassic to Middle Jurassic-aged subduction systems. The study also identified two distinct accretionary complexes within the area, likely formed during the Eocene collision of the Indian and Myanmar plates.
GEOLOGICAL JOURNAL
(2022)
Article
Geology
Dong Fu, Bo Huang, Tim E. Johnson, Simon A. Wilde, Fred Jourdan, Ali Polat, Brian F. Windley, Zhaochu Hu, Timothy Kusky
Summary: This study reports the discovery of early Paleozoic boninitic blueschists and associated greenschists from the eastern Proto-Tethyan North Qilian orogenic belt in northeastern Tibet. These rocks provide important insights into the initiation and subsequent subduction processes of an intra-oceanic subduction zone. The findings also highlight the role of former upper plate island arc/forearcs in reducing the preservation of initial subduction-related rock records in ancient orogenic belts.
Article
Geology
Pengchuan Li, Yusheng Wan, Hangqiang Xie, Simon A. Wilde, Chunyan Dong, Dunyi Liu
Summary: This paper reviews the geology of the Beijing-Zhangjiakou area and discusses its geological evolution in the context of the North China Craton. The geological and tectonic evolution of this area can serve as a proxy for the whole craton's history. The paper provides helpful information for both geologists and non-geologists attending the 2022 Beijing-Zhangjiakou Winter Olympics who are interested in rocks and geology.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geosciences, Multidisciplinary
Tao Wu, Xuan-Ce Wang, Simon A. Wilde, Qiu-Li Li, Chong-Jin Pang, Jia-Xi Zhou
Summary: This study presents a case from southeastern Guizhou Province, South China, demonstrating the decoupling of isotopes between magmatic zircons and their mafic host rocks due to limited crustal contamination. The Hf-O isotopes of zircons suggest crustal contribution, while the whole-rock isotopes indicate a mantle-derived source.
PRECAMBRIAN RESEARCH
(2022)
Article
Geochemistry & Geophysics
Anamitra Dasgupta, Santanu Kumar Bhowmik, Somnath Dasgupta
Summary: This study investigates the changes in metamorphic style in the Hole Narsipur Greenstone Belt (HGB) in South India and identifies three overlapping metamorphic cycles. These findings are significant for understanding the tectonic evolution and crust formation in the region.
JOURNAL OF PETROLOGY
(2022)
Article
Geosciences, Multidisciplinary
Hao-Dong Li, Jian-Bo Zhou, Simon A. Wilde
Summary: The Central Asian Orogenic Belt (CAOB) was formed by multiple collisional and accretionary events in the Paleo-Asian Ocean. This study focuses on the South Tianshan-Solonker Suture, the largest suture within the CAOB, and provides a systematic understanding of its nature and development. Based on Chinese literature and geochronological data, the suture zone is divided into four distinct segments, demonstrating the amalgamation between different cratons and blocks. The closure of the Paleo-Asian Ocean occurred in the late Carboniferous and continued until the late Permian. The study also highlights the influence of the Paleo-Pacific tectonic domain on the Yanji Belt in the middle-late Triassic.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Rongfeng Ge, Simon A. Wilde, Wenbin Zhu, Teng Zhou, Yang Si
Summary: This paper reviews the Archean geological record of the Tarim Craton and proposes a new model for the formation and evolution of Archean continental crust. The study reveals that most Archean TTGs were formed by water-fluxed melting of thick proto-arcs built on thick Archean oceanic crust, while rare high-pressure TTGs were formed by water-fluxed melting of subducted arcs during intermittent subduction and arc accretion.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Chunyan Dong, Rongfeng Ge, Shoujie Liu, Simon A. Wilde, Hangqiang Xie, Wenbin Zhu, Hailin Wu, Yuan Li, Yusheng Wan
Summary: By studying the Aktashtagh area in the southeastern margin of the Tarim Craton, northwestern China, multiple episodes of early Precambrian magmatism have been identified, which are important for understanding the formation and evolution of early continental crust.
Article
Multidisciplinary Sciences
Bo Huang, Tim E. Johnson, Simon A. Wilde, Ali Polat, Dong Fu, Timothy Kusky
Summary: This study provides new evidence for plate tectonics 2.55-2.51 billion years ago by reporting the coexistence of Neoarchean divergent and convergent plate boundary rock assemblages. The findings suggest that the subduction zone during that time was warmer than average. The results also indicate lateral plate motions in the late Neoarchean and the possible operation of plate tectonics, albeit with higher subduction geotherms than in the Phanerozoic. Plate tectonic processes likely played an important role in shaping Earth's surficial environments during the Neoarchean and Paleoproterozoic.
NATURE COMMUNICATIONS
(2022)
Article
Geosciences, Multidisciplinary
Chunyan Dong, Zhongyuan Xu, Simon A. Wilde, Mingzhu Ma, Shoujie Liu, Shiwen Xie, Pengchuan Li, Yusheng Wan
Summary: This study reports the geochronological and petrographic characteristics of 12 magmatic samples from the Daqingshan area. The samples have magmatic zircon ages of 2530-2469 Ma, with some samples showing ages influenced by late Palaeoproterozoic tectonothermal events. Combined with previous studies, the findings suggest that the late Mesoarchaean-early Neoarchaean was a period of significant continental crustal growth, and the late Neoarchaean supracrustal and plutonic rocks likely formed in an arc environment.
GEOLOGICAL MAGAZINE
(2023)
Article
Geosciences, Multidisciplinary
M. Ram Mohan, Neal J. McNaughton, D. Srinivasa Sarma, M. Rajamanickam, Ian R. Fletcher, Simon A. Wilde, Birger Rasmussen, Bryan Krapez, S. Balakrishnan
Summary: This study presents new SHRIMP U-Pb zircon and titanite ages, whole-rock geochemical and Sm-Nd isotopic data for granitoids in the Chitradurga Greenstone Belt. The results show that the growth of the belt is related to horizontal tectonics since at least 3.2 Ga.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Keisuke Suzuki, Toshiyuki Kurihara, Teruki Sato, Hayato Ueda, Toshiro Takahashi, Simon A. Wilde, M. Satish-Kumar
Summary: Devonian-Carboniferous strata in the Hida Gaien belt, Southwest Japan, undergo lithological changes from clastic rocks and limestones to volcanic rocks. The sedimentary rocks during the Devonian period were derived from various basement rocks and the source shifted to basalts and rhyolites in the early Carboniferous period. Zircon grains indicate sediment supply from different areas in Eastern Asia and NE Gondwana. The Hida Gaien belt and other regions were geographically close to NE Gondwana during the Paleozoic era.
Article
Geochemistry & Geophysics
Sampriti Basak, Eric Hasenstab, Santanu Kumar Bhowmik, Axel Gerdes, Somnath Dasgupta, Carsten Muenker, Gr. Ravindra Kumar, Sumit Chakraborty
Summary: Studying high-grade metamorphic rocks in a crustal-scale shear zone can provide insights into the Archean tectonic processes. Petrological investigations reveal different compositions and reaction histories of these rocks. By using thermobarometry, phase equilibria modeling, and geochronology, a multi-stage P-T-t history was reconstructed, suggesting an early form of peel-back styled orogenesis and intracrustal differentiation.
JOURNAL OF PETROLOGY
(2023)
Article
Geochemistry & Geophysics
Tao Wu, Wen Zhang, Simon A. Wilde, Jianggu Lu, Guoliang Zhang, Chunfeng Li, Xuegang Chen, Shuangshuang Chen
Summary: This study develops a new in situ Pb analytical protocol and applies it to plagioclase-hosted melt inclusions from IODP Expedition 349 Site U1433 in the South China Sea. The analysis reveals extreme Sr isotopic heterogeneity in the plagioclase phenocrysts, indicating their early crystallization in the magma chamber from different batches of mantle-derived melts. The melt inclusions also show highly variable Pb isotopes, suggesting the presence of ancient cratonic lower continent crustal materials in the sub-ridge mantle of the southwest Sub-basin, SCS.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Libeesh Lukose, Dibyendu Dutta, Mayashri Rajkakati, Arindam Guha, Santanu Kumar Bhowmik
Summary: This study investigates the constituent minerals of different kinds of ultramafic rock samples through petrographic, mineral, and compositional studies. It identifies the dominant absorption features of olivine and different pyroxenes in these rocks. The study also recognizes absorption bands indicative of secondary hydrous minerals associated with alteration. The findings have significance in interpreting remotely sensed data and identifying fossil subduction systems.
JOURNAL OF EARTH SYSTEM SCIENCE
(2023)