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Petrologic Feature of Meta-Granitioids and Their Geological Ages in Weibei Area,Tianshui,Gansu Province(PDF)

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

Issue:
2007年第01期
Page:
6-10
Research Field:
Publishing date:

Info

Title:
Petrologic Feature of Meta-Granitioids and Their Geological Ages in Weibei Area,Tianshui,Gansu Province
Author(s):
LI Yong-jun; YANG Gao-xue; PANG Zhen-jia; LIU Jing
School of Earth Sciences and Resources Management, Chang’ an University, Xi’an 710054, Shaanxi, China
Keywords:
meta-granitoid;  petrology;  geological age;  Weibei area;  Tianshui;  Gansu Province
PACS:
P581
DOI:
-
Abstract:
Weibei area is located in the joint of the Qilian and North Qinling orogenic belts. From detailed studies on the petrology,contact relation, deformation, metamorphism and so on,it is confirmed that although the granitoids had been strongly metamorphosed and deformed, they still contain clear primary fabrics. There are clear intrusive contact relations between the granitoids and their country rocks. So the meta-granitoids can be recognized and separated from the metamorphic sequences. They are grouped as the Mesoproterozoic- Neoproterozoic gneissoid granite-monzogranite-granodiorite, with their isotope ages of 953.4 Ma to 1 450 Ma, and the Sinian schistostose quartz monzogranite diorite. This offers important information for the study of magmatic event and tectonic environment in the area.

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Last Update: 1900-01-01