Oceanic crust subduction in the Zhurihe area, central Inner Mongolia during Middle Ordovician: Constrains from age and geochemistry of trondhjemites

ZHOU Lulu; SHU Guangqiang; WANG Jichun; LIU Jungang; LI Dongjun; ZHAO Xin; CHEN Zhang; LIU Zhiwei; TANG Gang; WANG Shuangtao; LI Qinguo

doi:10.12097/j.issn.1671-2552.2022.04.003

2022 Vol. 41, No. 4

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ZHOU Lulu, SHU Guangqiang, WANG Jichun, LIU Jungang, LI Dongjun, ZHAO Xin, CHEN Zhang, LIU Zhiwei, TANG Gang, WANG Shuangtao, LI Qinguo. Oceanic crust subduction in the Zhurihe area, central Inner Mongolia during Middle Ordovician: Constrains from age and geochemistry of trondhjemites[J]. Geological Bulletin of China, 2022, 41(4): 545-558. doi: 10.12097/j.issn.1671-2552.2022.04.003

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ZHOU Lulu, SHU Guangqiang, WANG Jichun, LIU Jungang, LI Dongjun, ZHAO Xin, CHEN Zhang, LIU Zhiwei, TANG Gang, WANG Shuangtao, LI Qinguo. Oceanic crust subduction in the Zhurihe area, central Inner Mongolia during Middle Ordovician: Constrains from age and geochemistry of trondhjemites[J]. Geological Bulletin of China, 2022, 41(4): 545-558. doi: 10.12097/j.issn.1671-2552.2022.04.003

Oceanic crust subduction in the Zhurihe area, central Inner Mongolia during Middle Ordovician: Constrains from age and geochemistry of trondhjemites

1.
Anhui Natural Gas Development Co.Ltd., Hefei 230051, Anhui, China
2.
China Chemical Geology and Mine Bureau Shandong Geological Prospecting Institute, Jinan 250014, Shandong, China
3.
Institute of Inner Mongolia Geological Survey, Hohhot 010020, Inner Mongolia, China
4.
Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi'an 710018, Shaanxi, China

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Corresponding author: SHU Guangqiang, 499852877@qq.com

Received Date: 30 March 2020

Revised Date: 17 February 2022

Publish Date: 15 April 2022

Abstract

Abstract

This paper reports zircon U-Pb ages and Hf isotope data as well as geochemical data of trondhjemites which are latest discovered from the Zhurihe area in central Inner Mongolia, with the aim of constraining oceanic crust subduction during Middle Ordovician.The dating results show that the trondhjemites formed in Middle Ordovician (472±3 Ma and 466±5 Ma).The trondhjemites manifest as the geochemical characteristics of typical subducted-oceanic-crust-type adakites being rich in Si, Al, Na and poor in K, with high values of Sr and low values of Y and Yb, with Eu and Sr positive anomalies, with intense fractionation between light rare earth elements and heavy rare earth elements, being rich in large ion lithophile elements (LILEs) and loss of high field strength elements(HFSEs).The zircon ε_Hf(t) values of trondhjemites are between +8.8 and +15.1, so are T_DM1 values between 475 Ma and 728 Ma as well as T_DM₂ values between 476 Ma and 885 Ma.According to the latest regional geological survey, there exist an Early Paleozoic oceanic subduction zone in the Zhurihe area what indicates at least during Middle Ordovician the Paleo-Asian Ocean began to subduct towards the North China plate in the Zhurihe area.The magmatic emplacement-crystallization activities which are represented by the trondhjemites with the characteristics of typical adakites are response to the oceanic crust subduction.
- trondhjemite /
- Early Paleozoic /
- Paleo-Asian Ocean /
- oceanic crust subduction /
- geochemistry /
- central Inner Mongolia /
- geological survey engineering

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References

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