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Geoscience ›› 2011, Vol. 25 ›› Issue (1): 1-14.

• Water Resource and Environment • Previous Articles     Next Articles

Tectonic Evolution of Central and South Tianshan Orogenic Belts in the Central Asia and Mineralization Background

 ZUO  Guo-Chao1, LIU  Yi-Ke1, ZHANG  ZHao-Chong2, HUANG  He2   

  1. 1.Gansu Geological Survey, Lanzhou, Gansu730000,China;
    2.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083,China
  • Online:2011-02-24 Published:2011-02-27

Abstract:

The Central and South Tianshan orogenic belts are located across the Central Asia. The Late Proterozoic breakup event of Rodinia Supercontinent led to the formation of many variable-size blocks surrounded by palaeo-oceans. The NE-striking Talas-Fergana throughout the researched area was a characteristic of transform fault in Palaeozoic time, and it controlled the tectonic evolution and mineralization difference between east and west sections of the fault. In the north margin of the Central Tianshan microplate, there was a CambrianOrdovician paleoocean basin. The west section of its south margin had experienced two breakup events from Cambrian to Middle Devonian and formed an archipelago ocean setting. The carbonaceousand siliceous-shale formations in the passive margin of Silurian oceanic province are the best layers for hosting gold deposits. The paleo-ocean in the east section of the south margin of the Central Tianshan microplate occurred from Sinian to Late Devonian. During Late Carboniferous time, there were northwest thrust orogenic events in the west, whereas there were the reverse thrust orogenic events in the east sections. Continental collision-type granites are widespread through the South Tianshan area in the Late Carboniferous, which are genetically related to tungsten, tin, niobium-tantalum, molybdenum, copper, lead and zinc deposits. Talas-Fergana fault, which formed in Late Permian and Triassic, was characterized by dextral strike slip. Subsequently, the emplacement of the post-collision-type granites plays a key role in the mercuric and antimony mineralization. Talas-Fergana fault was characterized by strike slip and extension during Jurassic. In Cenozoic, the tectonic uplift resulted in compression and shortening of the South Tianshan was triggered by the northward subduction of the Indian Plate.

Key words: tectonic evolution, oreforming background, archipelago ocean, TalasFergana fault, Southwest Tianshan orogenic belt

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