GEOCHRONOLOGY AND GEOCHEMISTRY OF THE HEINAOBAO PLUTON IN SIZIWANGQI, INNER MONGOLIA AND ITS TECTONIC EVOLUTION

XIONG Guang-qiang; ZHAO Hong-tao; LIU Min; ZHANG Da; WANG Hao-ran; WANG Zhong

2013 Vol. 19, No. 2

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XIONG Guang-qiang, ZHAO Hong-tao, LIU Min, ZHANG Da, WANG Hao-ran, WANG Zhong. GEOCHRONOLOGY AND GEOCHEMISTRY OF THE HEINAOBAO PLUTON IN SIZIWANGQI, INNER MONGOLIA AND ITS TECTONIC EVOLUTION[J]. Journal of Geomechanics, 2013, 19(2): 162-177.

Citation:

GEOCHRONOLOGY AND GEOCHEMISTRY OF THE HEINAOBAO PLUTON IN SIZIWANGQI, INNER MONGOLIA AND ITS TECTONIC EVOLUTION

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2.
Institute of Geological Survey of Inner Mongolia, Hohhot 010020, China

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Corresponding author: ZHANG Da, zhangda@cugb.edu.cn

Received Date: 26 January 2013

Publish Date: 25 June 2013

Abstract

Abstract

Heinaobao granitoid in the Siziwangqi area of Inner Mongolia tectonically belongs to Early Paleozoic hyperplasia plate in the northern margin of the North China plate. The granitiod is predominantly of composed of granodiorite and granote porphyry. The La-ICP-MS U-Pb zircon dating method and petrochemical analysis were used to study and understand its formation age and nature. As a result, zircons from granodiorite U-Pb ages of 407.4±4.7 Ma and 268.0±2.7 Ma, the first age represents the one event of ocean-continent subduction and the second age represents the one event of continent-continent collision. Petrochemistry date indicated that the Heinaobao rock in Siziwangqi belongs to the calc-alkaline series, and gradually near to the hypokalemic Tholeiitic series, depleted in high field strength elements. Geochrono logical and petrochemical data implied that the samples had syn-collisional characteristics. Combined with regional tectonic background, the tectonic background of Heinaobao Sizwangqi is the subduction, collision and docking of Siberian plate and North China Plate, it belongs to Paleo-Asian Ocean tectonic domain, while the late tectonic evolution remains to be further research.
- Heinaobao pluton in Siziwangqi /
- Xing'an Mongolian Orogenic /
- tetconic evolution /
- zircon U-Pb dating

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References

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