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YU Ji-yuan, JI Bo, GUO Lin. THE PETROGENESIS AND TECTONIC SIGNIFICANCES OF SILURIAN WEST-LUOTOUJUAN ROCKS FROM BEISHAN NIUJUANZI AREA IN GANSU PROVINCE, NW CHINA[J]. Journal of Geomechanics, 2017, 23(2): 253-263.
Citation: YU Ji-yuan, JI Bo, GUO Lin. THE PETROGENESIS AND TECTONIC SIGNIFICANCES OF SILURIAN WEST-LUOTOUJUAN ROCKS FROM BEISHAN NIUJUANZI AREA IN GANSU PROVINCE, NW CHINA[J]. Journal of Geomechanics, 2017, 23(2): 253-263.
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THE PETROGENESIS AND TECTONIC SIGNIFICANCES OF SILURIAN WEST-LUOTOUJUAN ROCKS FROM BEISHAN NIUJUANZI AREA IN GANSU PROVINCE, NW CHINA

  • 1.

    Xi'an Center of Geological Survey, CGS, Xi'an 710054, Shannxi, China

  • 2.

    Orogen Research Center of China Geological Survey, Xi'an 710054, Shannxi, China

  • 3.

    Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Land and Resources, Xi'an 710054, Shannxi, China

Received Date:  03 November 2016
Publish Date:  25 April 2017
    Abstract

  • West-Luotuojuan Adakitesin Beishan Niujuanzi Area belongs to Peraluminous calcium alkaline magma series with a high content of SiO2(>57.94%), Al2O3(>16.66%), a low content of MgO( < 4.32%), a relatively high Na2O/K2O ratio, displaying Na-rich feature. In respect of trace elements, it has a high content of Sr (589×10-6~1170×10-6), a low content of Y (4.60×10-6~13.90×10-6) and Yb (0.43×10-6~1.32×10-6).The differentiation of light and heavy rare earth is obvious ((La/Dy)N=4.60~13.87, (La/Yb)N=7.17~20.58), and there is not obvious anomaly of Eu (Eu/Eu*=0.85~1.32). Rich in light rare earth and large ionlithophile elements, and the loss of high field-strength elements Nb, Ta, Ti and heavy rare earth HREE, are similar with the typical Adakite rocks which formed by subducted oceanic crust melting.It is believed that West-Luotuojuan Adakite is a partial melting product which warm oceanic crust in Silurian (U-Pb age of 428.9 Ma) period moving to Gongpo spring-east Qiyi mountain early Paleozoic active continental margin in the process of subduction. The study of the rock mass provides evidence for the view that Beishan orogenic belt closed in the late early Paleozoic and split anew in the early late Paleozoic.

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