|Table of Contents|

Geochronology and Geochemical Characteristics of A-type Granites in Boguorize Area, the Northern Margin of Gangdese Belt, Tibet, China and Their Geological Significance(PDF)

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

Issue:
2019年第06期
Page:
644-657
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Geochronology and Geochemical Characteristics of A-type Granites in Boguorize Area, the Northern Margin of Gangdese Belt, Tibet, China and Their Geological Significance
Author(s):
SHI Shao-fei1;  XIAO Yuan-fu1*;  YUAN Hao-wei1;  WEI Yong-feng1; 2;  QIU Chan-yuan1;  JIANG Xiao-qiang1
(1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 2. Sichuan Geology and Mineral Bureau Regional Geological Survey Team, Chengdu 610213, Sichuan, China)
Keywords:
geochemistry;  zircon U-Pb age;  A-type granite;  closure time of ocean basin;  Bangonghu-Nujiang suture zone;  Tibet
PACS:
P588.12; P597
DOI:
-
Abstract:
Boguorize area is located in the central part of Bangonghu-Nujiang suture zone, the northern margin of Gangdese belt, Tibet. At present, the closure time of Bangonghu-Nujiang ocean basin is controversial. The A-type granite outcropped in Boguorize area intrudes into the first member of Woronggou Formation in the form of rock stocks, and its lithology is mid-fine-grained biotite granite porphyry. The rock is characterized by high SiO2(the contents are 70.61%-74.94%), K2O(4.96%-7.48%), lean Al2O3(11.90%-13.79%), high ratio of FeOT/MgO(7.47-25.88), and low TiO2(0.16%-0.25%), which belongs to weak aluminum-quasi-aluminum alkaline series(A/CNK is 0.90-1.12, A/NK is 1.10-1.34). The total contents of REE are(179.80-370.29)×10-6,(La/Yb)N is 5.36-8.70, and Eu anomaly is 0.28-0.61. The chondrite-normalized REE pattern is right-leaning seagull type, which belongs to typical aluminous A-type granite. On the primitive mantle-normalized trace element spider diagram, the large ion lithophile elements and high field strength elements(Rb, Th, U, K, Zr and Hf)are obviously enriched, while Ba, Sr, Nb, Ta and Ti are obviously depleted. The higher contents of Zr, Nb, Ce and Y, and the higher ratios of Y/Nb, Yb/Ta and Ce/Nb indicate that the A-type granite is A2-type. The combination research of petrography, geochemistry and regional geological data shows that the A-type granite in Boguorize area forms in the extension of the lithosphere after the collision. It is the product of the lower crust displacing, which causes the asthenosphere material upwelling and heats the metamorphic mudstone in the upper crust, and make the metamorphic mudstone occur partially melt and undergo a certain degree of separation crystallization. The LA-ICP-MS zircon U-Pb age of A-type granite is(110.8±1.3)Ma, indicating that it is formed in late Early Cretaceous. It is estimated that Bangonghu-Nujiang ocean basin is closed at least in late Early Cretaceous.

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Last Update: 2019-11-19