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Geochemical Characteristics of Granodiorite and Arenaceous Sedimentary Rocks in Chon-Ashuu Area, Kyrgyzstan

키르키스스탄 촌아슈 지역 화강섬록암질암 및 사질원 퇴적암의 지화학적 특징

  • 김수영 (한국지질지원연구원, 해외광물자원연구실) ;
  • 지세정 (한국지질지원연구원, 해외광물자원연구실) ;
  • 박성원 (한국지질지원연구원, 해외광물자원연구실)
  • Received : 2011.06.09
  • Accepted : 2011.08.16
  • Published : 2011.08.28

Abstract

Chon-Ashuu copper mining claim area is located, in terms of the geotectonic setting, in the northern part of the suture line which is bounded with the marginal part of Issik-kul micro-continent on the southern part of North Tien-Shan terrane. The geological blocks of Chon-Ashuu districts belong to the southern tip of Kazakhstan orocline. The rock formation of this area are composed of the continental crust or/and arc collage and the paleo-continental fragments-accretionary wedge complex of pre-Altaid orogenic materials. ASI(Alumina Saturation Index) of Paleozoic plutonic rocks in Chon-Ashuu area belong to the peraluminous and metaluminous rocks which were generated from fractional crystallization of Island and volcanic arc crusts in syn-post collisional plate. The geology of the ChonAshuu area consists of upper Proterozoic and Paleozoic rock formations. According to Harker variation diagrams for Chon-Ashuu arenaceous sedimentary rocks, the silty sandstone of Chon-Ashuu area showing the mineralogical immaturity were derived from Island arc or the marginal environments of active continent in Cambro-Carboniferous period. Numerous intrusive rocks of Chon-Ashuu area are distributed along north east trending tectonic structures and are bounded on four sides by the conjugate pattern. The most common type of the plutonic rocks are granodiorite and monzodiorite. According to the molecular normative An-Ab-Or composition (Barker, 1979), the plutonic rocks in Chon-Ashuu area are classified into tonalite - trondhjemite - granodiorite (TTG) series which are an aggregation of rocks which is the country rock of copper mineralization, that are formed by melting of hydrous mafic crust at high pressure.

Keywords

Tienshan terrane;orocline;ASI(peraluminous, metaluminous);TTG

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