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Discovery of 102Ma gabbro in the Tianshuihai area of Karakoram terrane, and its constraints on regional Mesozoic tectonic evolution
Li Hang1,2,3; Ke Qiang1,2,3; Li Hao1,2,3; Hong Tao1,2,3; Zhao TongShou4; Xu XingWang1,2,3
2020
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume36Issue:4Pages:1041-1058
AbstractThe Karakoram terrane is an important unit of the Tibet Plateau. Recently, we carried on geological survey on the Linjitang Mesozoic basin, southeastern Karakoram, and found a gabbro intrusion in the Tianshuihai area. The gabbro has some distinct geochemical signatures, including: 1) high Al2O3 (15.07% similar to 15.32%) and TiO2 (1.31% similar to 1.34%), low P2O5 (0.19% similar to 0.21%) and alkali (Na2O+K2O = 3.49% similar to 3.72%); 2) enriched in LREE (La/Yb = 6.17 similar to 7.39) and Th, La, Nd and Tb, and depleted in Rb, Sr, P and Y; and 3) enriched Sm-Nd isotope with eNd values between -5.80 and -5.90. The gabbro has LA-ICP-MS zircon Pb-206/U-238 age of 102 +/- 1Ma (MSWD = 0.92; n = 14), indicating that the pluton was emplaced in the late Early Cretaceous. The gabbro contains a great number of inherited zircons, 38 of which have ages ranging from 2450 to 232Ma, 16 of them are Precambrian zircons, suggesting existence of Precambrian basement. These geochemical evidence and occurrence of inherited zircons indicate that the gabbro with extensive crustal contamination in extensional setting related to asthenosphere upwelling, this means that the Tianshuihai area was in an extensional setting at 102Ma. Combining with regional geological evidence, it is suggested that tectonic framework of the Tianshuihai area was changed into extensional at an initial stage of the Late Cretaceous Linjitang basin, and proposed that the Karakoram terrane had gone through three stage tectonic evolution in Mesozoic period, i.e. the Jurassic-Early Cretaceous normal subduction and arc-basin system, plate subduction and orogeny at Early Cretaceous, and the Late Cretaceous normal subduction and arc-basin system.
KeywordKarakoram terrane Tianshuihai Tectonic evolution Gabbro Precambrian basement
DOI10.18654/1000-0569/2020.04.05
WOS KeywordBACK-ARC BASIN ; LA-ICP-MS ; CALC-ALKALINE GRANITOIDS ; ALEUTIAN ISLAND-ARC ; WESTERN TIBET ; CONTINENTAL-CRUST ; VOLCANIC-ROCKS ; TRACE-ELEMENTS ; OROGENIC BELT ; MAGMA SOURCE
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000534690600005
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/96702
Collection矿产资源研究院重点实验室
Corresponding AuthorXu XingWang
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
4.Xinjiang Bur Geol & Mineral Explorat & Dev, Geophys & Geochem Explorat Team, Changji 831100, Peoples R China
First Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences;  Institute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences;  Institute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li Hang,Ke Qiang,Li Hao,et al. Discovery of 102Ma gabbro in the Tianshuihai area of Karakoram terrane, and its constraints on regional Mesozoic tectonic evolution[J]. ACTA PETROLOGICA SINICA,2020,36(4):1041-1058.
APA Li Hang,Ke Qiang,Li Hao,Hong Tao,Zhao TongShou,&Xu XingWang.(2020).Discovery of 102Ma gabbro in the Tianshuihai area of Karakoram terrane, and its constraints on regional Mesozoic tectonic evolution.ACTA PETROLOGICA SINICA,36(4),1041-1058.
MLA Li Hang,et al."Discovery of 102Ma gabbro in the Tianshuihai area of Karakoram terrane, and its constraints on regional Mesozoic tectonic evolution".ACTA PETROLOGICA SINICA 36.4(2020):1041-1058.
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