Article
Geology
Zhi-He Xu, Wei Xin, Xiao-Dong Zhou, Qing-Lin Xu, Fu-Wen Li, Zhao-Jun Song
Summary: Granitoids are important evidence of the accretion and reworking process of the continental crust. By analyzing their geochemical characteristics, the early geodynamic mechanisms can be reconstructed. This study focused on the Permian-Triassic Granitoids in the East Kunlun Orogenic Belt and determined their chronology and petrogenesis, shedding light on their source regions and the significance of their geodynamic and crustal growth.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Fazilat Yousefi, Ryan D. Mills, Mahmoud Sadeghian, David R. Lentz, Christina Wanhainen, Habibollah Ghasemi, Laicheng Miao
Summary: The Eocene intermediate to felsic subvolcanic rocks of the Torud-Ahmad Abad magmatic belt in Central Iran zone display specific geological and geochemical characteristics, possibly originating from partial melting of the lithosphere, as indicated by isotopic analysis.
JOURNAL OF EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Xin-Yu Long, Jie Tang, Wen-Liang Xu, Chen-Yang Sun, Jin-Peng Luan, Shuai Xiong, Xiao-Ming Zhang
Summary: This study presents in situ trace element and Nd isotopic data of apatites from metamorphosed and metasomatized and unaltered granitoids in the eastern Central Asian Orogenic Belt. The distinct textures and geochemical compositions of apatites from altered and unaltered granitoids indicate different petrogenetic processes. The unusual geochemical features of the apatites provide a record of small-scale crustal assimilation during magma evolution that is not evident from the whole-rock geochemistry.
GEOSCIENCE FRONTIERS
(2023)
Article
Geochemistry & Geophysics
Yikang Quan, Debin Yang, Xiangyu Yan, Anqi Wang, Leran Hao, Haotian Yang, Feng Wang, Wenliang Xu
Summary: Apatite geochemical and in-situ Nd isotopic data of Mesozoic granitoids in northeastern North China Craton were analyzed to gain new insights into their petrogenesis. Sr and REEs in apatite were found to be useful geochemical proxies to reveal the mineral crystallization sequence. In addition, Sr, Nb, Ga, and heavy REEs in apatite were identified as typical geochemical proxies to identify the adakitic property. The variable in-situ Nd isotopic compositions and the presence of mafic microgranular enclaves reflected different mantle contributions in the formation of these granitoids.
Article
Geosciences, Multidisciplinary
Abdullah Sar, Sevcan Kurum, Ahmet Feyzi Bingol
Summary: This study investigates the magmatic evolution of the Eastern Pontides orogenic belt in northeastern Turkey using new zircon U-Pb ages, Lu-Hf isotopes, and whole-rock geochemical and Sr-Nd isotopic analyses. The results suggest a heterogeneous magma source, possibly derived from a juvenile lower crust. Additionally, the magmatism in the area is associated with the collision of the Anatolide Taurid Platform with the Pontides.
JOURNAL OF EARTH SCIENCE
(2023)
Article
Geochemistry & Geophysics
Mehdi Rezaei-Kahkhaei, Fernando Corfu, Carmen Galindo, Reza Rahbar, Habibollah Ghasemi
Summary: This study investigates the origin of the Lakhshak plutonic complex in southeastern Iran using geological, geochemical, mineralogical, and isotope evidence. The results suggest that the rocks originated from partial melting of garnet amphibolite and experienced mixing with melts from flysch sediments and Sistan ophiolites. The post-collisional nature of the magmatism is supported by U-Pb dating. Thermobarometry indicates a continuum of crystallization stages during magma ascent. These findings provide insights into the processes that formed the plutonic complex.
Article
Geosciences, Multidisciplinary
S. De Clercq, D. Chew, G. O'Sullivan, T. De Putter, J. De Grave, S. Dewaele
Summary: The KAB region in Central Africa is characterized by the poorly understood Karagwe-Ankole belt (KAB), which contains various generations of granites with hypotheses regarding their emplacement. The youngest generation of granites, G4, are associated with Sn-W-Ta ore deposits and are considered to be parental granites. Through geochemical analysis and U-Pb zircon dating, it was found that G4 granites contain xenocrystic zircon, indicating inheritance of older granites or basement rocks. The geochemical variability and presence of xenocrystic zircons suggest localized melting from a heterogeneous source, favoring an intracontinental setting.
PRECAMBRIAN RESEARCH
(2021)
Article
Geochemistry & Geophysics
Xue-Bing Zhang, Feng-Mei Chai, Chang-Jia Bao, Dong-Mei Qi
Summary: The Jia'erbasidao deposit in the South Altay of Northwest China is a Fe skarn deposit, mainly composed of granodiorite and porphyritic biotite monzogranite formed in the Early Devonian and Early Permian, with moderately peraluminous characteristics and complex magma sources.
Article
Geosciences, Multidisciplinary
Joseph Martial Akame, Vinciane Debaille, Marc Poujol
Summary: Hafnium and neodymium isotopes are powerful tools for tracking the mechanisms of crustal generation and differentiation. In this study, the Hf and Nd isotopic analyses of Archean mafic and felsic igneous rocks from the Sangmelima terranes in southern Cameroon were conducted. The results show a subchondritic initial isotopic ratio for Mesoarchean charnockite and TTG suites, indicating the involvement of Eo-to Paleoarchean components in their petrogenesis. The study also reveals two episodes of mantle-derived mafic magmatism in the Ntem Complex during the Mesoarchean period.
PRECAMBRIAN RESEARCH
(2023)
Article
Geology
Xiaolei Chu, Jinggui Sun, Yong Zhang, Yang Liu, Zhikai Xu, Jilong Han, Chuntao Zhao, Yanpeng Liu, Kezhang Qin
Summary: The Ermi porphyry Cu deposit is a medium-sized copper deposit located on the northeastern margin of the North China Craton. The copper mineralization mainly occurs within intrusions of various rock types and is thought to have formed in an active continental margin environment related to plate rollback during the Cretaceous period.
ORE GEOLOGY REVIEWS
(2021)
Article
Geology
Yalei Wang, Shengchao Xue, Xiaoman Wang, Zhaowei Zhang, Luyang Wang, Yu Xin, Ze Zhang, Yongkang He
Summary: Numerous early Paleozoic mafic-ultramafic intrusions in the Qinghai-Tibet Plateau host important Ni-Cu sulfide mineralization. The Shitoukengde Ni-Cu deposit is one of the most representative magmatic sulfide deposits in the East Kunlun Orogenic Belt. The deposit exhibits disseminated and net-textured sulfide mineralization, with variable sulfur contents and low platinum-group element concentrations.
ORE GEOLOGY REVIEWS
(2023)
Article
Geochemistry & Geophysics
Toby J. Boocock, Eva E. Stueken, Grant M. Bybee, Ramona Konig, Adrian J. Boyce, Julie Prytulak, Iris Buisman, Sami Mikhail
Summary: This study investigates the geochemical characteristics of nitrogen in the calc-alkaline pluton at Loch Doon, SW Scotland, and finds that the whole-rock likely inherited its N contents and δ^15N signature from the initial source composition and shows homogeneity at a pluton scale. At a mineral scale, it is found that N preferentially partitions into feldspars over mica in this system, and a large and near constant equilibrium isotope fractionation factor exists between biotite and both feldspars.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geology
Chao Li, Jun Yan
Summary: This study investigates the geochemical compositions of apatite in representative I-type and A-type granitic intrusions in the eastern Jiangnan Orogen to understand their petrogenesis and polymetallic mineralization potential. The results reveal that apatites in these granitoids exhibit specific geochemical characteristics and can be classified into two groups. Quantitative calculation and modeling suggest that I-type granitic magmas are more volatile-rich and oxidized compared to A-type granitic magmas. Based on the relationship between intrinsic magmatic variables and ore-forming elements, the early I-type granitoids in the study area have a strong polymetallic mineralization potential, while the late A-type granites may have rare metal mineralization potential.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Engineering, Civil
Hui Zhou, Xingxing Kuang, Yinlei Hao, Can Wang, Yuqing Feng, Yiguang Zou, Meizhuang Zhu, Chunmiao Zheng
Summary: Geothermal resources in the southern Tibetan Plateau are rich and have significant variations in their origin, evolution, and circulation mechanism. The hydrochemical characteristics of cold springs and geothermal springs are different, with carbonate dissolution and cation exchange being the dominant processes for geothermal springs. The main carbon source for geothermal waters is deep-derived CO2, while cold springs and surface waters are primarily replenished by meteoric water. The temperature and circulation depth of geothermal waters exhibit large variations.
JOURNAL OF HYDROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Cesar Witt, Marc Poujol, Massimo Chiaradia, Diego Villagomez, Monique Seyler, Olivier Averbuch, Nordine Bouden
Summary: U-Pb dating and isotopic and trace-element analyses of detrital zircon grains provide important insights into the Late Cretaceous-Cenozoic evolution of the southern Ecuadorian magmatic arc. The results suggest intense arc magmatism at ca. 72 Ma, ca. 60 Ma, and ca. 43 Ma, as well as a major accretionary event in the Late Cretaceous. The isotopic composition of the zircons indicates melting of both the lower and upper crust, enriched mantle sources, and the persistence of overthickened crust.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2023)
Article
Geosciences, Multidisciplinary
D. P. Gladkochub, T. Donskaya, S. A. Pisarevsky, E. B. Salnikova, A. M. Mazukabzov, A. B. Kotov, Z. L. Motova, A. Stepanova, V. P. Kovach
Summary: This study presents new geological, geochronological, geochemical and Nd isotopic data on the latest Paleoproterozoic dolerite sills in the southern Siberian craton, suggesting that they were likely emplaced during the Paleoproterozoic. The mafic melts responsible for the dolerites' genesis were generated in an intracontinental extensional setting, indicating an overall extensional tectonic environment in the southern part of the Siberian Craton around 1.65-1.60 Ga. The synthesis of global magmatism around 1.65-1.58 Ga supports the idea of overall extensional tectonic environments related to the retreat of subduction slabs around the supercontinent Nuna.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Nadezhda A. Kanygina, Andrey A. Tretyakov, Kirill E. Degtyarev, Victor P. Kovach, Sergei Yu Skuzovatov, Kwan-Nang Pang, Kuo-Lung Wang, Hao-Yang Lee
Summary: The metasedimentary complexes represented by quartzite-schist Kiik Group play a significant role in the structure of the Aktau-Mointy terrane, with accumulation occurring in the late Mesoproterozoic to early Neoproterozoic. U-Pb LA-ICP-MS dating of detrital zircons reveals age estimates predominantly falling within certain intervals, showing similarities with other terranes in the western CAOB.
PRECAMBRIAN RESEARCH
(2021)
Article
Geochemistry & Geophysics
I. K. Kozakov, V. P. Kovach, E. B. Salnikova, A. N. Didenko, Yu Plotkina, A. M. Fedoseenko
Summary: The paper discusses the geochronology, geochemistry, and isotopic studies of rocks in the eastern Dzabkhan terrane, revealing its composite nature with formations from various time periods. It suggests that the growth of the Neoproterozoic continental crust in the region was influenced by subduction processes and continental rifting, contributing to the breakup of the Rodinia supercontinent.
Article
Geosciences, Multidisciplinary
A. B. Kotov, T. M. Skovitina, V. P. Kovach, S. D. Velikoslavinskii, I. N. Buchnev, E. V. Adamskaya, V. A. Gorovoy
Summary: The Sm-Nd isotope-geochemical studies of Cenozoic sand deposits in the Muya Depression suggest that the sand samples have Nd model ages indicating their source is likely from metasedimentary rocks transported over a relatively short distance.
DOKLADY EARTH SCIENCES
(2021)
Article
Geology
I. K. Kozakov, V. P. Kovach, E. B. Salnikova, A. Kroner, E. V. Adamskaya, P. Ya. Azimov, B. M. Gorokhovsky, A. A. Ivanova, Ch. K. Oydup, Yu. V. Plotkina
Summary: The Sangilen and Khan-Khuhei blocks in the southwestern part of the Tuva-Mongolian terrane form a composite structure that experienced Early Paleozoic regional low- to moderate-pressure metamorphism, with previous signs of higher pressure metamorphism. The rocks in both blocks have been intruded by granitoids with ages predating the primary metamorphic event, indicating a complex geological evolution involving multiple metamorphic events.
STRATIGRAPHY AND GEOLOGICAL CORRELATION
(2021)
Article
Geosciences, Multidisciplinary
D. P. Gladkochub, T. V. Donskaya, S. A. Pisarevsky, R. E. Ernst, U. Soderlund, A. B. Kotov, V. P. Kovach, A. V. Okrugin
Summary: The paper presents new data on the late Paleoproterozoic dolerites of the Siberian craton, including geological, geochronological, geochemical, and Nd isotopic data. The study reveals differences in magmatism between the northern and southern Siberia, and provides insights into the formation of the Doros and East Anabar dolerites.
PRECAMBRIAN RESEARCH
(2022)
Article
Geochemistry & Geophysics
R. O. Ovchinnikov, A. A. Sorokin, V. P. Kovach, W. L. Xu
Summary: This is the first study on the Sm-Nd isotopic geochemistry of metamorphic rocks in the Gudjal block, which is considered as a part of the Bureya continental massif. The study reveals the distinct isotopic parameters of different rock types.
GEODYNAMICS & TECTONOPHYSICS
(2022)
Article
Geochemistry & Geophysics
A. A. Tretyakov, K. E. Degtyarev, N. A. Kanygina, V. P. Kovach, B. Fedorov
Summary: This study reports the results of examining the Late Precambrian effusive and plutonic rocks of the Dyusembai and Aktass volcanic-plutonic associations in the western part of the Southern Ulutau. It was found that these formations were formed in the Tonian period of the Neoproterozoic and that the Southern Ulutau underwent evolution in an environment of an active continental margin. The incorporation of these terranes into the basement of a large volcanic-plutonic belt indicates subduction of the oceanic lithosphere beneath the northwestern margin of the Rodinia supercontinent.
Article
Geochemistry & Geophysics
A. A. Nosova, M. G. Kopylova, N. M. Lebedeva, Y. O. Larionova, A. V. Kargin, L. V. Sazonova, A. A. Vozniak, V. P. Kovach
Summary: This study investigates the relationship between melt sources for lamprophyres, kimberlites, and other alkaline carbonate-rich melts. It identifies three groups of rocks, T1, T2, and T3, and determines that all three groups have contributions from the mantle, with T1 influenced by the Kola Alkaline Carbonatite and T2 influenced by the Paleoproterozoic metasomatized lithospheric mantle.
Article
Geochemistry & Geophysics
A. V. Maslov, V. N. Podkovyrov, V. P. Kovach, N. Yu. Zagornaya
Summary: This study analyzes litho- and isotopic geochemical indicators to investigate the composition of ancient catchment areas, paleoclimate, and paleobioproductivity in the Mariinsk-Nokhtui interval. The results show the presence of new sources of fine-grained aluminosiliciclastic rocks during the pre-Ura or Ura periods. The geochemical data and sediment analysis suggest that the Vendian and Early Cambrian paleocatchment areas were influenced by humid subtropical and tropical climates. Additionally, there is no significant relationship between paleoproductivity and geodynamic settings in the Vendian.
LITHOLOGY AND MINERAL RESOURCES
(2022)
Article
Geochemistry & Geophysics
V. A. Zaika, A. A. Sorokin, V. B. Khubanov, V. P. Kovach
Summary: This paper presents the first results of U-Th-Pb (LA-ICP-MS) isotopic dating of detrital zircons from the Paleozoic (?) metasedimentary rocks of the Nilan Terrane of the Mongol-Okhotsk orogenic belt. The study aims to refine the age estimates and determine the correlation with previously dated sediments in the same belt. The research shows that the metasedimentary rocks of the Nilan Terrane are characterized by the absence of Early Precambrian zircons, slightly negative epsilon Nd(t) values, and Mesoproterozoic tNd(DM) and tNd(C) values. Most of the detrital sediments are believed to come from continental massifs of the Amur superterrane.
GEODYNAMICS & TECTONOPHYSICS
(2022)
Article
Geosciences, Multidisciplinary
Alexander M. Kozlovsky, Ekaterina B. Salnikova, Vladimir V. Yarmolyuk, Anna A. Ivanova, Valery M. Savatenkov, Julia V. Plotkina, Tserentsegmid Oyunchimeg
Summary: This study presents U-Pb dating of alkaline granitoids in SW Mongolia and Northern Mongolia using chemical abrasion isotope dilution-thermal ionization mass spectrometry (CA ID TIMS). The results reveal their close petrogenesis in different tectonic positions, formed mainly through post-accretion and anorogenic extension events. The alkaline granitoids from these two areas share similar geochemical characteristics but differ in Nd isotopic signatures, which are related to the evolution of their hosting terranes.
Article
Geosciences, Multidisciplinary
Victor Kovach, Elena Adamskaya, Alexander Kotov, Victor Podkovyrov, Elena Tolmacheva, Dmitry Gladkochub, Eugene Sklyarov, Sergey Velikoslavinsky, Yulia Plotkina, Tatiana Skovitina, Kuo-Lung Wang, Hao-Yang Lee, Boris Gorokhovsky
Summary: In this study, new data on the metaterrigenous deposits of the Kemen Group in the Udokan Complex were presented and their age and provenance were discussed. The carbonate-terrigenous deposits of the Udokan Complex are important in terms of their age and the presence of sediment-hosted copper deposits. The detrital zircons indicate a complex geological history and suggest discrete crust-forming events in the Aldan Shield region.
PRECAMBRIAN RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
A. M. Larin, A. B. Kotov, E. B. Salnikova, V. P. Kovach, Yu Plotkina, T. M. Skovitina
Summary: The granitoids of the Uda complex were formed in the Early Cretaceous, with an initial magma sourced from a mixture of Early Precambrian lower crust and mantle, where the crustal component dominated. They likely represent the eastern end of the Udsko-Zeya (Stanovoy) post-collision magmatic belt, stretching for over 1000 km along the southern framing of the Siberian craton parallel to the Mongol-Okhotsk suture zone, connecting different tectonic blocks of the northeastern part of the Central Asian fold belt.
DOKLADY EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
A. M. Larin, A. B. Kotov, V. P. Kovach, E. B. Sal'nikova, D. P. Gladkochub, V. M. Savatenkov, S. D. Velikoslavinskii, T. M. Skovitina, N. G. Rizvanova, N. A. Sergeeva, V. Yu Vodovozov
Summary: The paper presents geochemical, geochronological, and isotope-geochemical studies of granitoids of the Kodar complex in the western part of the Aldan shield. The rocks are identified as postcollisional A-type rapakivi granites formed within a larger South Siberian magmatic belt during the late stages of the Paleoproterozoic orogeny. The source of the Kodar granitoids is dominated by a crustal component with a heterogeneous nature, along with some contribution from ancient enriched mantle and possibly OIB-type components.