THE PETROGENESIS AND TECTONIC SIGNIFICANCES OF SILURIAN WEST-LUOTOUJUAN ROCKS FROM BEISHAN NIUJUANZI AREA IN GANSU PROVINCE, NW CHINA

YU Ji-yuan; JI Bo; GUO Lin

Volume 23 Issue 2

Apr. 2017

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YU Ji-yuan, JI Bo, GUO Lin, 2017. THE PETROGENESIS AND TECTONIC SIGNIFICANCES OF SILURIAN WEST-LUOTOUJUAN ROCKS FROM BEISHAN NIUJUANZI AREA IN GANSU PROVINCE, NW CHINA. Journal of Geomechanics, 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

YU Ji-yuan^{1, 2, 3
,},
JI Bo^{1, 2, 3},
GUO Lin^{1, 2}

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

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Received: 2016-11-03
Published: 2017-04-28

Abstract

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.
- Adakite,
- U-Pb age,
- Silurian,
- partial melting of the subducted oceanic crust,
- West-Luotuojuan rock mass,
- Beishanin Gansu province

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References(39)

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