Tectonic Implications and Petrogenesis of the Various Types of Magmatic Rocks from the Zedang Area in Southern Tibet

Yuanku Meng; Fahui Xiong; Jingsui Yang; Zhao Liu; Kieran A. Iles; Paul T. Robinson; Xiangzhen Xu

doi:10.1007/s12583-019-1248-3

Volume 30 Issue 6

Dec 2019

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Journal of Earth Science > 2019 > 30(6): 1125-1143.

Yuanku Meng, Fahui Xiong, Jingsui Yang, Zhao Liu, Kieran A. Iles, Paul T. Robinson, Xiangzhen Xu. Tectonic Implications and Petrogenesis of the Various Types of Magmatic Rocks from the Zedang Area in Southern Tibet. Journal of Earth Science, 2019, 30(6): 1125-1143. doi: 10.1007/s12583-019-1248-3

Citation:

Yuanku Meng, Fahui Xiong, Jingsui Yang, Zhao Liu, Kieran A. Iles, Paul T. Robinson, Xiangzhen Xu. Tectonic Implications and Petrogenesis of the Various Types of Magmatic Rocks from the Zedang Area in Southern Tibet. Journal of Earth Science, 2019, 30(6): 1125-1143. doi: 10.1007/s12583-019-1248-3

Citation:

Yuanku Meng, Fahui Xiong, Jingsui Yang, Zhao Liu, Kieran A. Iles, Paul T. Robinson, Xiangzhen Xu. Tectonic Implications and Petrogenesis of the Various Types of Magmatic Rocks from the Zedang Area in Southern Tibet. Journal of Earth Science, 2019, 30(6): 1125-1143. doi: 10.1007/s12583-019-1248-3

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Tectonic Implications and Petrogenesis of the Various Types of Magmatic Rocks from the Zedang Area in Southern Tibet

doi: 10.1007/s12583-019-1248-3

1.
Shandong Key Laboratory of Depositional Mineralization and Sedimentary Minerals, Shandong University of Science and Technology, Qingdao 266590, China
2.
Center for Advanced Research on the Mantle (CARMA), Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
4.
Department of Geosciences and Geography, University of Helsinki, Helsinki 00014, Finland

More Information

Corresponding author: Fahui Xiong
Received Date: 21 May 2019
Accepted Date: 25 Aug 2019
Publish Date: 01 Dec 2019

Abstract

Abstract

In this study, we report systematically field observations, geochronology, whole-rock geochemistry and Sr-Nd-Hf isotopic dataset on the various types of magmatic rocks collected from the Zedang area. Chemically, the diabase and gabbro have a low-K calc-alkaline affinity, whereas the basalt and plagiogranite have medium to high-K calc-alkaline characteristics. In addition, the basalts are highly enriched in light rare earth elements (LREE) and large ion lithophile elements (LILE), but strongly depleted in high strength field elements (HFSE), indicating that their magma source probably was derived from a subduction- or arc-related setting. In contrast, both the gabbro and diabase mainly demonstrate an N-MORB-like affinity consistent with normal mid-oceanic ridge basalt (N-MORB) origin. The zircon U-Pb dating results suggest that the basalts were crystallized earlier at ca. 158-161 Ma (Oxfordian stage), but the gabbro was crystallized at ca. 131 Ma (Hauterivian stage of Early Cre-taceous). The zircon U-Pb dating results correspond with the field observations that the veins of gabbro intruded basalt. Furthermore, the plagiogranite has a weighted mean age of ca. 160 Ma (MSWD=2.1) consistent with the basalt within the uncertainty. The basalt and the plagiogranite have significantly positive ε_Hf(t) values (+5.8 to +15.6 and +8.6 to +16.1, respectively), suggesting that they were originated from partial melting of a depleted source. However, basalt and plagiogranite are characterized by the wide variations of ε_Hf(t) values indicating minor amounts of exotic crustal material input during the later magma evolution. Additionally, the basalt shows duplex geochemical features of island-arc and mid-oceanic ridge basalt, corresponding to the supra-subduction zone-(SSZ) type affinity. To sum up, two distinct magmatic events identified in this study probably suggest an intra-oceanic arc system ex-isting in the Zedang area during the Late Jurassic, but the intra-oceanic arc subduction extinguished in the Early Cretaceous as suggested by the N-MORB-like gabbro and diabase. Integrated with regional background and different rock types, as well as geochemical features, we conclude that intra-oceanic arc subduction setting developed during the Late Jurassic in the Zedang area, southern Tibet.
- geochronology,
- petrogenesis,
- magmatic rocks,
- Zedang sub-terrane,
- tectonic implica-tions

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References(145)

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