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THE MESOZOIC TECTONIC SETTING OF NORTH CHINA PLATFORM AND ITS RELATION TO HYDROTHERMAL M ETALLOGENESIS

Hu Shouxi1, Ye Ying2, Zhao Yiying1, Liu Hongying1   

  1. 1. Dept. of Earth Sci. , Nanjing University; 2. Dept. of Earth Sci., Zhejiang University
  • Received:1995-03-20 Revised:1995-03-20 Online:1995-09-20 Published:1995-09-20

Abstract: The initial Eurasian plate was formed during the Late Hercynian cycle. Its intense interaction with Paleo-Pacific plate (includmg Farallon,Kula and Izanagi plates) took place during the Indosinian event and was the kinetic source not only for the extensive metamorphism and ductile shearing, but also for A -type subduction and relevant granitoid formation in the North China Platform, espacially along its margin. After the formation of initial Eurasian Plate in the final phase of the Hercynlan cycle, North China Platform with its Early Precarnbrlan crystalline basement was situated in an intensely campressive tectonic setting caused by two dominant stress fields related respectively to Paleo-Pacfic subduction and further compression and to compression and A-type subduction between that platform and the Siberian plate to the north and the South China Plate to the south. Tectonic line created by the former stress field strikes in NE and NNE directions, along which there are important granitic and metallogenic belts in East China. Mineral deposits, ore fields and belts controlled by this tectonic line shows inistral strike-slip character following the pattern along which the components of the Paleo-Pacific, such as Farallon,Kuia and Izanagi, acted on East China continent. The latter stress fie1d is related to intraplate compression in S-N direction and has brought about granitic belts and relevant hydrothermal ore deposits arranged in E-W strike. “The remote tectonic effect” caused by the Paleo-Pacific acting on initial Eurasian Plate dies away from the subduction zone or coast line, so that the predominant NE-and NNE-trending tectonic pattern in the coastal area gives its way to the NWW-and EW-trending pattern westwards. This is demonstrated by the examples from Mesozoic Au, Mo and other hydrothermal mineral deposits and orefields in Jiaobei and Huaxiong Terranes at the cast and south margin of North China Platform.