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| DISCUSSION ON THE NEOARCHEAN GEOLOGICAL EVOLUTION IN ANSHAN-BENXI-FUSHUN REGION |
| TIAN Yi, YU Chao, WANG Guang-wei, DOU Shi-yong, BAO Dong-ming |
| Liaoning Institute of Geological and Mineral Survey, Shenyang 110032, China |
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Abstract Anshan-Benxi-Fushun is the main outcropped area and key study area for Archean rocks in China, where the metamorphic plutonic intrusion is dominant while the outcropped metamorphic supracrustal rocks are less than 20% by area. The metamorphic plutonic rocks are emplaced in different periods of the Eoarchean-Neoarchean, with the protolith composed of TTG and CA rock series. The typical metamorphic supracrustal rocks are magnetite quartzite and amphibolite. The protolith formations of the two types of rock experienced continuous temperature reduction and decompression process from granulite through amphibolite to greenschist facies in Archean. According to the outcropping characteristics of Neoarchean rocks, the authors divide the study area into three micro paleo-continent nucleuses, namely Anben, Qingyuan and Liaobei paleo-continent nucleuses. Mesoarchean and Neoarchean are the most important epeirogenetic periods, with the Anben micro paleo-continent nucleus as the earliest accretion center, going through matching and splitting transformation, then forming the current geological structure.
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Received: 20 September 2014
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2015, Vol. 24 
