|Table of Contents|

Zircon U-Pb Dating and Geochemical Characteristics of Dagele Granite in the Eastern Margin of East Kunlun Orogenic Belt, China and Their Tectonic Implications(PDF)

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

Issue:
2020年第04期
Page:
442-463
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Zircon U-Pb Dating and Geochemical Characteristics of Dagele Granite in the Eastern Margin of East Kunlun Orogenic Belt, China and Their Tectonic Implications
Author(s):
FENG Keng1;  LI Rui-bao1; 2*;  PEI Xian-zhi1; 2;  LI Zuo-chen1; 2;  PEI Lei1; 2;  LIU Cheng-jun1; 2;  CHEN Guo-chao1;  LI Xiao-bing1;  WANG Meng1; 2;  ZHAO Shao-wei1; 2;  CHEN You-xin1; 2;  ZHOU Hai1; 2
(1. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 2. Key Laboratory of Western China's Mineral Resources and Geological Engineering of Ministry of Education, Chang'an University, Xi'an 710054, Shaanxi, China)
Keywords:
granite;  zircon U-Pb age;  geochemistry;  petrogenesis;  Late Permian;  subduction;  magma mixing;  East Kunlun
PACS:
P597
DOI:
10.19814/j.jese.2020.05009
Abstract:
As an important part of arc magmatic rocks in East Kunlun, Dagele granites are of great significance to the interpretation of the evolution of Paleo-Tethys. In order to study its petrogenesis and tectonic setting, the petrology, zircon U-Pb geochronology and petrogeochemistry of granites exposed in Dalage area, the eastern margin of East Kunlun orogenic belt were studied in detail. The results show that Dagele plutons are composed of grey medium- to fine-grained granites, and some dark diorite enclaves; LA-ICP-MS Zircon U-Pb ages of granite and diorite enclave are(261.0±2.8)Ma and(261.6±1.6)Ma, respectively; granites are medium-high K calc-alkaline and metaluminous to weak peraluminous series, and belong to I-type granites; the characteristics of REE show that LREEs are relatively abundant, and HREEs are relatively depleted; the characteristics of trace elements show that the granites are rich in Rb, Th, U, etc., and poor in Nb, Ta, etc., with low Mg# and ratio of Nb/Ta; diorite enclaves are featured by medium K calc-alkaline, and rich in Fe, Mg, Ca, Ti, etc., with high Mg#. Petrogenesis studies show that granites are the production of partial melting of amphibolite in the continental lower crust, but diorite enclave is the production of rapid condensation of mafic magma injected into granites. Combined with regional data, it is suggested that Dagele granites form in the continental arc environment related to the northward subduction of Buqingshan-Anemaqen ocean, which further indicates that Paleo-Tethys ocean has subducted northward under North East Kunlun terrane in Late Permian.

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Last Update: 2020-07-27