Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (3): 832-846.doi: 10.13278/j.cnki.jjuese.201503115

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Genesis of Xijing Intrusion from Longshoushan Terrane and the Tectonic Significance

Duan Jun1, Qian Zhuangzhi1,2, Jiao Jiangang1,2, Lu Hao3, Feng Yanqing1   

  1. 1. College of Earth Sciences and Resources, Chang'an University, Xi'an 710054, China;
    2. MOE Key Laboratory of Western China Mineral Resources and Geological Engineering, Xi'an 710054, China;
    3. The Third Exploration Institute of Geology and Mineral Resources of Shandong Province, Yantai 264004, Shandong, China
  • Received:2014-12-10 Published:2015-05-26

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Abstract:

The Xijing mafic intrusion is located in Longshoushan terrane in the west of Alxa block and the north of Qilian orogenic belt. Previous interpretation for mafic-ultramafic intrusions along Longshoushan rift suggested that the genesis of these intrusions were related to the magmatism of Jinchuan intrusion. The major petrographic components of Xijing intrusion are olivine websterite and gabbro, and Xijing intrusion was formed in (421.0±9.0) Ma, which is consistent with the age of eclogites from North Qilian orogenic belt. The values of εNd(t) and (87Sr/86Sr)i are 4.06-5.52 and 0.704 548-0.707 575 respectively, which lie in the field of lithospheric mantle. The calculation of isotope and trace elements indicates that Xijing intrusion was contaminated by the lower crustal materials in about 10%. At last, we interpret the evolution of Xijing intrusion and Longshoushan intrusion belt as follows: during Qilian continental subduction, the ocean lithosphere detached from the continental lithosphere, the hot asthenosphere impinged the base of the overriding mantle lithosphere near the breakoff point. Because of the conduction, the heat flow went up and caused the melting of lithosphere at solidus of a hydrated peridotite at a depth of 80 km, which produced basalt magmatism. During the ascent of magma through the mantle into the crust, the magma was contaminated with lower crust and formed the Xijing intrusion and Longshoushan mafic-ultramafic intrusion belt.

Key words: SHRIMP dating, geochemistry, Xijing mafic intrusion, Longshoushan mafic-ultramafic intrusion belt, north of Qilian qrogenic belt

CLC Number: 

  • P588.1

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