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Geochemical Features and Tectonic Setting of Pingdao Granite in Tianshui Region of Gansu Province(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2005年第04期
Page:
33-37,57
Research Field:
Publishing date:

Info

Title:
Geochemical Features and Tectonic Setting of Pingdao Granite in Tianshui Region of Gansu Province
Author(s):
LI Suo-cheng1; LI Yong-jun2; LI Jin-bao2; LIU Zhi-wu2
1.Geological Survey of Gansu Province, Lanzhou 730000, China; 2.School of Earth Sciences and Resources Management, Chang’ an University, Xi’ an 710054, China
Keywords:
granite;  geochemical features;  tectonic setting;  Pingdao granite;  Tianshui;  Gansu Province
PACS:
P596
DOI:
-
Abstract:
Five successive stages of magmation in the Pingdao granite could be recognized, they are plagiogranite, granodior- ite, biotite adamellite,porphyaceous biotite adamellite and syeogranite. The granite, with NK/A= 0.49～ 0.62, ANKC> 1. 1, rich muscavite, and corundum when calculated by CIPW, belongs to the aluminium supersaturation and calc-alkali se- ries. The TiO2, FeO, MgO, CaO, and Na2O decrease increasingly but the Fe2O3and K2O increase strongly with the SiO2 increasing. Petrochemistry study indicates that the source rocks of the Pingdao granite are graywacke and fragmental rocks and they are rich the LREE, withδEu= 0.35～ 0.7 and intense Eu depletion. Meanwhile, they are poor in Ba, Rb, Sr, Y, Cu, Zr, Ga and Ni, but rich in Nb, Ta, Bi, Th, Cr, Sn, Mo, Hf and Sc, and especially rich in Hf, Sn and Sc. The infor- mation of the tectonic geochemistry displays that the Pingdao granite is a intraplate rift type.

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