Global Geology 2014, 17(1) 24-33 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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Keywords
petrogenesis
granite prophyry
A-type granite
zircon U-Pb dating
Keyouzhongqi area
Inner Mongolia
Authors
WU Qing1
YANG Weihong2
HE Zhonghua1*
YANG Deming1
MA Rui1and WANG Jianguo1
PubMed
Article by WU Qing1
Article by YANG Weihong2
Article by HE Zhonghua1*
Article by YANG Deming1
Article by MA Rui1and WANG Jianguo1

Petrogenesis and tectonic setting of granite porphyry in Keyouzhongqi area,Inner Mongolia

WU Qing1, YANG Weihong2, HE Zhonghua1*, YANG Deming1, MA Rui1and WANG Jianguo1

1. College of Earth Sciences,Jilin University,Changchun 130061,China; 2. Manage Center of Central Geological Exploration Fund,Ministry of Land and Resources,Beijing 100045,China

Abstract

The authors studied the geochemistry,zircon U-Pb ages,Hf isotope of the granite porphyry and its petrogenesis and tectonic setting in the studied area. The zircon U-Pb dating indicates the formation of the gran- ite porphyry is in Early Cretaceous (125. 1 ±1. 5 Ma). The granite porphyry has high-SiO2and alkali-rich fea- tures,which belongs to high-K calc-alkaline series rocks (A/CNK = 0. 95%--1. 25%). The analyses of trace elements show the characteristics of a swallow-shaped REE distribution pattern with enrichment in LREEs and most of LILEs and HFSEs,depletion in Ba,Sr,Nb,P and Ti,and especially strong depletion in Eu,which indicates the granite porphyry belongs to the aluminous A-type granite. Their εHf(t)range from 5. 94 to 8. 80 with Hf two-stage model ages (TDM2) of 620 Ma to 803 Ma. Combining with the regional tectonic background, we conclude that the source of the rocks is the new crust materials accreted from depleted mantle in Neoprotero- zoic and is the product of partial melting of middle and lower crustal rocks,which may be suffered from the dual impact of the subduction of the Palaeo-Pacific Ocean and the closure of the Mongol-Okhotsk Ocean.

Keywords petrogenesis   granite prophyry   A-type granite   zircon U-Pb dating   Keyouzhongqi area   Inner Mongolia  
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