Article
Geochemistry & Geophysics
Min Ji, Xiao-Ying Gao, Yong-Fei Zheng
Summary: Partial melting of crustal rocks contributes to the formation of complementary granulites and granites in collisional orogens, but the petrogenetic relationship between migmatites and granites is still unclear. In this study, a comprehensive analysis of field geology, petrography, and geochemistry was conducted on the leucosomes, leucocratic dikes, and leucogranites in the Cona area of eastern Himalaya. The results show that the leucosomes and leucocratic dikes, which originated from different source rocks, share similarities in composition, while the leucogranites, formed from mixed sources, have distinct geochemical characteristics. The two groups are likely the products of different anatectic processes in the source, linked to hydration and dehydration melting, respectively. The spatiotemporally coupled dehydration-hydration anatectic processes play a crucial role in the formation of coherent granite, migmatite, and granulite in collisional orogens.
Article
Chemistry, Multidisciplinary
Muhammad Qasim, Owais Tayyab, Lin Ding, Javed Iqbal Tanoli, Zahid Imran Bhatti, Muhammad Umar, Hawas Khan, Junaid Ashraf, Ishtiaq Ahmad Khan Jadoon
Summary: This study investigates the age of the post-collisional Chitarwatta Formation in Pakistan using detrital zircon U-Pb dating. The formation is a marine sequence consisting of sandstone, siltstone, and mudstone. The dominant age population of the detrital zircon ranges from 390 Ma to 1100 Ma, with a significant percentage of younger ages between 40 Ma and 120 Ma. The sources of the detritus are suggested to be the Higher Himalaya and Tethyan Himalaya for the older ages, and the Kohistan-Ladakh arc and Karakoram block for the younger ages. It is proposed that the Chitarwatta Formation received detritus from the northern sources through the Indus drainage system.
APPLIED SCIENCES-BASEL
(2023)
Article
Geochemistry & Geophysics
Qiong-Xia Xia, Meng Yu, Er-Lin Zhu, Ren-Xu Chen, Wan-Cai Li, Yong-Fei Zheng, Zi-Fu Zhao, Zhao-Ya Li
Summary: The Dabie-Sulu orogenic belt was formed by collisional thickening and subsequent exhumation of ultrahigh-pressure metamorphic rocks. The current seismic tomography is mainly due to post-collisional reworking in the Early Cretaceous. The partial melting of the UHP rocks and the associated tectonic processes play a crucial role in understanding the dynamic regime and thermal state of collisional orogens after plate convergence.
Article
Geochemistry & Geophysics
Hironobu Harada, Tatsuki Tsujimori, Yoshiaki Kon, Shogo Aoki, Kazumasa Aoki
Summary: The Hida Belt is a continental fragment mainly composed of granite-gneiss complexes. Leucogranite with clinopyroxene can be found in the belt, indicating the involvement of carbonate during anatexis. Zircon-in-titanite thermometry and U/Pb isotope ratios suggest a high apparent thermal gradient and the timing of regional anatexis in the Hida Belt.
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
Geochemistry & Geophysics
Nan Wang, Zhiyong Zhang, Marco G. Malusa, Lin Wu, David Chew, Jien Zhang, Dunfeng Xiang, Wenjiao Xiao
Summary: Northeast Asia, particularly the Zhangguangcai Range, provides a detailed insight into subduction-related tectonic activities, including the emplacement of granites and eruption of volcanic rocks during the Early Mesozoic, as well as episodic exhumation events since the Jurassic. The interactions and juxtaposition of multiple tectonic domains have led to complex geological processes in this region.
Article
Geosciences, Multidisciplinary
Elise M. Exnicios, Andrew Carter, Yani Najman, Peter D. Clift
Summary: This study reconstructs changes in erosion and exhumation patterns in the Himalayan foreland basin from the Early Miocene to Pliocene using sediment geochemistry, detrital zircon U-Pb dating, and apatite fission track analyses. The provenance of foreland sediments shifted from Tethyan and Greater Himalayan sources to Crystalline Inner Lesser Himalayan sources, likely reflecting exhumation events and tectonic movements.
Article
Geosciences, Multidisciplinary
Shaoji Yang, Haijin Xu, Pan Wang, Junfeng Zhang, Qiang Liu
Summary: Migmatite in the Sulu ultra-high-pressure (UHP) terrane provides valuable information on the anatexis process during the deep subduction of continental crust, with clear evidence of intense melting. The zircon grains in the migmatite exhibit a core-rim structure, reflecting the inheritance of magmatic cores and the formation of anatectic overgrowth rims, which suggest a mid-Neoproterozoic granitic rock protolith. The anatexis significantly impacted the zircon Lu-Hf isotopic system, indicating a critical role in the exhumation of UHP metamorphic rocks.
GEOLOGICAL JOURNAL
(2021)
Article
Geochemistry & Geophysics
S. Ghoshal, N. McQuarrie, K. W. Huntington, D. M. Robinson, T. A. Ehlers
Summary: This study examines the impact of fault geometry, kinematics, and displacement on the exhumation history of the central Himalaya. The results indicate that most of the measured data can be explained by in-sequence faulting. Additionally, significant out-of-sequence faulting and high exhumation rates are observed, which are correlated with climate change.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Muhammad Awais, Xiao-Chi Liu, Muhammad Qasim, Fu-Yuan Wu
Summary: Through the study of the Shigar valley in northern Pakistan, we have found that the formation of the granitoids in this region is mainly attributed to the partial melting of metamorphic rocks and crust, with influence from the nearby Kohistan-Ladakh Arc.
GEOLOGICAL JOURNAL
(2022)
Article
Geology
H. Mvondo, T. Bineli Betsi, Chris R. M. McFarlane, J. Mvondo Ondoa, D. A. Archibald
Summary: The Central Africa Orogenic Belt (CAOB) and its neighboring belts underwent compressional deformation events labeled as D-1 to D-4, which occurred between the Neoproterozoic and Cambrian. Through various analyses, researchers were able to determine the timing of rock formation and the different compressional events in the Yaounde Domain of CAOB. The data also revealed the presence of inherited crust from older periods and provided insights into the tectono-metamorphic and magmatic processes of the region.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geochemistry & Geophysics
Long Cheng, Chengjiang Zhang, Hao Song, Qian Cheng
Summary: The Datian uranium deposit is a migmatite-hosted, high temperature, hydrothermal deposit in the Kangdian region. The uraninite at the deposit has been identified to have two phases with different mineral associations and crystal shapes, indicating at least two hydrothermal events.
Article
Geosciences, Multidisciplinary
Chen Han, Hu Guyue, Zeng Lingsen, Yu Xuhui, Li Yike
Summary: This study suggests that the Himalayan leucogranite is not an S-type granite, but rather a granitic rock derived from the crust. The research shows that the Paleozoic Zhada orthogneiss underwent crustal anatexis during the Miocene, and the Zhada leucogranite inherited the geochemical characteristics of both the orthogneiss and the Himalayan metasediments.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2022)
Article
Geochemistry & Geophysics
Sumit Mishra, Alexander Slabunov, Sergei A. Svetov, Anna Kervinen, Natalia S. Nesterova
Summary: In this study, zircons from the less foliated granites of the Chail Group in the Garhwal region were investigated, revealing their S-type composition and formation in a collisional tectonic setting. The U-Th-Pb isotope dating of zircons showed an age of 1845±19 Ma with inherited cores from different age groups, confirming the magmatic origin of some zircons and a metamorphic origin for others. The presence of inherited zircons suggests a possible origin from sedimentary rocks of the Aravalli and Bundelkhand Craton and Paleoproterozoic Aravalli Fold Belt rocks.
Article
Geology
Jinsheng Han, Huayong Chen, Jie Zhang, Yanfeng Zhang, Rongqing Zhang
Summary: This study investigates the age and petrogenesis of the Nanyangshan Li-Be-Nb-Ta-Rb-Cs-Sn mineralized pegmatite in China using in situ cassiterite U-Pb dating and tourmaline geochemical analysis. The age of the cassiterite is approximately 410 Ma, and the chemistry of tourmaline is closely related to the environment, making it a reliable exploration tool.
ORE GEOLOGY REVIEWS
(2022)
Article
Geochemistry & Geophysics
Thomas N. Lamont, Nick M. W. Roberts, Michael P. Searle, Phillip Gopon, David J. Waters, Ian Millar
Article
Geosciences, Multidisciplinary
S. Bodorkos, J. L. Crowley, J. C. Claoue-Long, J. R. Anderson, C. W. Magee
Summary: The crystallization age of the Derim Derim Dolerite is confirmed to be around 1320-1327 Ma, indicating a magmatic activity lasting approximately 10-15 million years. The geochemical variations in Mesoproterozoic intraplate mafic rocks across the Northern Territory may reflect a series of magmatic pulses previously obscured by low precision isotopic dates. The similarities between the timing and geochemistry of Derim Derim-Galiwinku mafic igneous activity and the Yanliao Large Igneous Province in North China Craton suggest relatively close proximity between the North Australian Craton and the North China Craton during this period.
AUSTRALIAN JOURNAL OF EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
I Metcalfe, J. L. Crowley
JOURNAL OF ASIAN EARTH SCIENCES
(2020)
Article
Geosciences, Multidisciplinary
Margaret D. Thompson, James L. Crowley
AMERICAN JOURNAL OF SCIENCE
(2020)
Article
Geosciences, Multidisciplinary
J. J. Cooling, J. L. Crowley, J. L. McKellar, J. S. Esterle, R. S. Nicoll, V Bianchi
Summary: This study presents U-Pb zircon ages and palynostratigraphic results from the Orallo Formation in the Surat Basin, Queensland. The results suggest a Berriasian?/Valanginian-Hautevarian age for the Orallo Formation. Additionally, combining these ages with previously published geochronological dates indicates the Jurassic-Cretaceous boundary likely lies within the Gubberamunda Sandstone in the Surat Basin succession.
AUSTRALIAN JOURNAL OF EARTH SCIENCES
(2021)
Article
Geology
Lyle L. Nelson, Emily F. Smith, Eben B. Hodgin, James L. Crowley, Mark D. Schmitz, Francis A. Macdonald
Article
Geology
Christopher R. Fielding, Tracy D. Frank, Allen P. Tevyaw, Katarina Savatic, Vivi Vajda, Stephen McLoughlin, Chris Mays, Robert S. Nicoll, Malcolm Bocking, James L. Crowley
Summary: The Upper Permian to Lower Triassic coastal plain successions of the Sydney Basin in eastern Australia have been investigated to assess palaeoenvironmental changes. Explosive volcanic eruptions during the late Permian and some during the Early Triassic influenced these basins, providing high-resolution age determination. The end-Permian Extinction marked the shift towards better-drained alluvial conditions into the Early Triassic, with no immediate aridification after the extinction event.
Article
Geochemistry & Geophysics
Thomas N. Lamont, Michael P. Searle, Phillip Gopon, Nick M. W. Roberts, Jon Wade, Richard M. Palin, David J. Waters
Article
Geology
Nicholas L. Swanson-Hysell, Steven A. Hoaglund, James L. Crowley, Mark D. Schmitz, Yiming Zhang, James D. Miller
Summary: The Duluth Complex in Minnesota, USA, is one of the largest mafic intrusive complexes on Earth, formed during the time of the Laurentia's interior. Despite the overall protracted duration of magmatic activity, there were intervals of more voluminous magmatism.
Article
Geology
Anna K. Bidgood, Andrew J. Parsons, Geoffrey E. Lloyd, Dave J. Waters, Rellie M. Goddard
Summary: Ultra high pressure (UHP) metamorphism in continental terranes involves subduction of continental crust to around 40 kbar before resurfacing, with the process being poorly understood yet widely debated. The felsic composition of UHP terranes makes traditional petrology-based techniques for determining peak pressures and temperatures difficult, leading to the reliance on the detection of coesite as an indicator of UHP conditions. The identification of palisade quartz microstructures formed during the retrograde transformation of coesite to quartz serves as a key criterion in identifying UHP terranes.
JOURNAL OF METAMORPHIC GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Benjamin J. C. Neil, H. Daniel Gibson, Sally J. Pehrsson, Edith Martel, Eric J. Thiessen, James L. Crowley
Summary: This study investigates the geological characteristics and detrital zircon geochronology of the Nonacho Group, revealing its depositional history, provenance, and tectonic setting. The findings suggest that the upper formations of the Nonacho Group originated from the Taltson and/or Thelon orogens, with a change in provenance possibly coinciding with a period of uplift and unroofing of plutons.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Eben Blake Hodgin, Juan Carlos Gutierrez-Marco, Jorge Colmenar, Francis A. Macdonald, Victor Carlotto, James L. Crowley, Justin R. Newmann
Summary: This study provides detailed insights into the tectonic and evolutionary history of the Eastern Cordillera in Peru, with important evidence related to the accretion of the Arequipa Terrane. It sheds light on the early Paleozoic tectonic history of the region and presents a new tectonic model explaining the late Neoproterozoic to early Cambrian collision events.
Article
Geochemistry & Geophysics
T. K. Ambrose, D. J. Waters, M. P. Searle, P. Gopon, J. B. Forshaw
Summary: The petrological analyses conducted on samples from the metamorphic sole of the Oman-United Arab Emirates ophiolite revealed peak pressure-temperature conditions of 700-900 degrees C and 10-12 kbar at depths of 30-40 km. Lower structural levels showed similar pressures but temperatures about 100 degrees C lower. The progression from granulite to amphibolite and greenschist facies and the subsequent underplating of lower-grade thrust slices released fluids that hydrated the overlying granulites and hanging-wall peridotites. These results suggest that the sole was exhumed along a flattening slab, consistent with observations from other studies.
Article
Multidisciplinary Sciences
Victor E. Guevara, Andrew J. Smye, Mark J. Caddick, Michael P. Searle, Telemak Olsen, Lisa Whalen, Andrew R. C. Kylander-Clark, Michael J. Jercinovic, David J. Waters
Summary: We used monazite petrochronology and thermal modeling to investigate the factors contributing to the rapid exhumation of the Nanga Parbat Massif in the western Himalayan syntaxis. Our results suggest that neither erosion nor crustal melting was the primary trigger for the accelerated exhumation observed in the region. Instead, larger-scale tectonic processes appear to be the main driver of the rapid exhumation in both the western and eastern Himalayan syntaxes.
Article
Mineralogy
Anna K. Bidgood, David J. Waters, Brendan J. Dyck, Nick M. W. Roberts
Summary: Low-strain metagranites in the Ladakh region of the Himalayas have been subducted to eclogite-facies conditions and preserved evidence of this subduction. They also underwent amphibolite-facies Barrovian metamorphism, obscuring their earlier metamorphic history.
MINERALOGICAL MAGAZINE
(2023)
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)