Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (1): 154-168.doi: 10.13278/j.cnki.jjuese.20190224

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Geochronology and Geochemistry of Triassic Gabbro in Northern Wulan, Northern Margin of Qaidam Basin

Yue Yue1, Sun Deyou1, Hou Kejun2, Peng Yinbiao3   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
    2. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;
    3. College of Marine Geosciences, Ocean University of China, Qingdao 266100, Shandong, China
  • Received:2019-10-25 Published:2021-02-02
  • Supported by:
    Supported by the National Natural Science Foundation of China (41572053)

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Abstract: The Mesozoic magmatic rocks are widespread in Wulan area of northern Qaidam, and consist largely of gabbro, diorite, granodiorite and granite. The LA-ICP-MS zircon U-Pb dating of two gabbro samples yield well-constrained ages of (241.9±0.9) Ma and (245.4±1.9) Ma, indicating their formation of the Middle Triassic. Their SiO2 content of gabbro in northern Wulan area is 47.94% and 52.01%, the total alkali content is low (1.25% and 1.47%), and the Ritman index is 0.33 and 0.26 respectively, belonging to cala-alkaline series. They have high Mg# (81 and 79), Cr (1 661.00×10-6 and 1 418.00×10-6), and Ni (394.00×10-6 and 280.00×10-6), similar to those predicted of the original basaltic melts. They have weak LREE/HREE fractionation (3.92 and 3.44) with nearly no Eu anomalies and no obvious magma differentiation. The primitive mantle normalized trace element spider diagrams show enrichment of large ion lithophile elements (e.g., K, Rb) and depletion of high field strength elements (e.g., Nb, Ta, Ti), characteristics considered typical of subduction-related arc magmatic rocks. The large variation of zircon εHf(t) values (from -3.0 to 9.3) implies that the crustal components seem to have been incorporated in the mantle-derived mafic magmas. Combined with regional geological evolution, we suggest that the gabbro formed in the continental marginal arc environment related to the northward subduction of the Paleo-Tethys Oceanic plate. The fluids released from the subducting oceanic slab promote partial melting of the overlying mantle wedge to produce basaltic magma, which was contaminated by crustal materials or mixed with crust-derived magma during magma ascending.

Key words: northern margin of Qaidam, gabbro, zircon U-Pb dating, geochemistry, magma arc, Paleo-Tethys Ocean

CLC Number: 

  • P588.12
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