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DONG Hong-kai, GUO Jin-cheng, CHEN Hai-yan, et al. Evolution Characteristics of Ordovician Intrusive Rock in Changshagou of Altun Region[J]. Northwestern Geology, 2014, 47(4): 73-87.
Citation: DONG Hong-kai, GUO Jin-cheng, CHEN Hai-yan, et al. Evolution Characteristics of Ordovician Intrusive Rock in Changshagou of Altun Region[J]. Northwestern Geology, 2014, 47(4): 73-87.
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Evolution Characteristics of Ordovician Intrusive Rock in Changshagou of Altun Region

  • Hebei Institute of Regional Geological and Mineral Resource Survey, Langfang 065000, China

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  • Received Date: June 16, 2014
  • Revised Date: October 23, 2014
  • Available Online: July 28, 2022
  • Published Date: December 04, 2014
    Graphical Abstract
    • Abstract
  • The intrusive rocks in the Changshagou area of Altun of Xinjiang province include pyroxenite, gabbro, diabase gabbro, quartz diorite and quartz monzodiorite. Both field geological characteristics and LA-ICP-MS zircon U-Pb dating show that the rocks formed in Ordovician. Basic-ultrabasic intrusive rock has the characteristics of mantle source type; intermediate-acidic intrusive rocks show dual characteristics of type I and type S, with its magma coming mainly from the upper mantle. Assimilation by blending in part of the crust-source material in the process of magma invasion endows the rock with the nature of crust-mantle mixed source magma. Formed in continental cracking tectonic environment, the basic-ultrabasic intrusive rocks are the product of plutonic magmatism related to deep fault and continental rift, while the intermediate-acid intrusive rocks are resulted in convergence tectonic environment.
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