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WANG Huaitao, REN Wenxiu, ZHAO Qixin, et al. Geochemical Characteristics and Tectonic Significance of A-type Granite in the South Margin of Zhaobishan, Beishan Area[J]. Northwestern Geology, 2016, 49(1): 39-49.
Citation: WANG Huaitao, REN Wenxiu, ZHAO Qixin, et al. Geochemical Characteristics and Tectonic Significance of A-type Granite in the South Margin of Zhaobishan, Beishan Area[J]. Northwestern Geology, 2016, 49(1): 39-49.
shu

Geochemical Characteristics and Tectonic Significance of A-type Granite in the South Margin of Zhaobishan, Beishan Area

  • 1.

    School of Earth Sciences, Lanzhou University, Lanzhou 730000, Gansu, China;Geology Survey of Gansu Province, Lanzhou 73000, Gansu, China

  • 2.

    Geology Survey of Gansu Province, Lanzhou 73000, Gansu, China

  • 3.

    Third Institute Geology and Mineral Exploration of Gansu Province Bureau of Geology and Mineral Rosources, Lanzhou 73000, Gansu, China

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  • Received Date: May 28, 2015
  • Revised Date: July 26, 2015
  • Published Date: March 04, 2016
    Graphical Abstract
    • Abstract
  • The biotite monzogranite, located in the south margin of Zhaobishan, was intruded in Hongliuhe ophiolite, which are characterized by high-K and calc-alkaline composition with SiO2 68.86%~73.27%, high alkali (K2O+Na2O=7.03~7.98), coupled with midium aluminum (Al2O3=13.75%~14.1%) and weakly peraluminous (A/NKC=1.03~1.07). These rocks have high ratios of Ga×104/Al(5.22 ~ 6.48)and Y/Nb (2.71 ~ 3.43) in trace elements, which also show evidently loss in Nb, Ta, Sr, P, Ti as well as the enrichments of K, La, Nd, Zr, Hf and Sm. They are also rich in LREE with (La/Yb)N=7.19 ~ 13.15, and negative Eu anomalies(δEu=0.82 ~ 0.84). The results indicate that this biotite monzogranite belongs to A(A2) granite, which was formed by partial melting of young oceanic crust and island arc after had being used to be heated by basaltic magma in the extensional environment of early Devonian. Represented by the west part of Hongliuhe-Niujuanzi-Xichangjing ophiolitic belts, the paleo-ocean was closed between the late Ordovician and early Devonian(446.4~404.8Ma). After that, there was a dynamical evolution which was characterized by the end of the squeeze and the beginning of stretch, with the conversion time may be around 415~404.8 Ma.
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