Abstract
The late Paleozoic magmatic rocks are widely distributed in the Mandakh area which is located in the Gurvansaikhan and Manlai terrains, where porphyry Cu deposits occur. In this paper we discuss petrochemical features and mineral assemblages of magmatic rocks in the Mandakh area. Furthermore, we compared petrochemical characteristics of magmatic rocks in the Mandakh area with host magmatic rocks of the Tampakan deposit (Philippines), Cerro Colorado deposit (Chili) and negative criteria of Cu deposits (Japan) due to try to characterize potential of the porphyry copper deposit related to magmatic rocks in Mandakh area. Geochemical features of magmatic rocks in Mandakh area are calc-alkaline, magnetite-series, I-type and similar to adakite type. The Devonian intrusive rocks comprised of syenite and syenogranite, while the Carboniferous intrusive rocks consist of granodiorite, monzodiorite, quartz-monzonite and hornblende granite. Devonian magmatic rocks are more alkaline in composition. Although, Devonian and Carboniferous magmatic rocks are slightly different from each other. Comparing with bonanza copper deposits in the world, they are possible to host porphyry mineralization.
Highlights
Mongolia lies within the Central Asian Orogenic Belt (CAOB) which is enormous and composed of a multiplicity of terranes including ancient island and continental arcs, ophiolites, passive continental margins, Precambrian continental blocks and high-T/low-P metamorphic zones
The late Paleozoic magmatic rocks are broadly distributed in the Mandakh area located in the Gurvansaikhan and Manlai terrains with porphyry Cu deposits
We have investigated petrochemical features and mineral assemblages of Devonian and Carboniferous magmatic rocks in the Mandakh area and compared with magmatic rocks in giant porphyry copper deposits in the world
Summary
Mongolia lies within the Central Asian Orogenic Belt (CAOB) which is enormous and composed of a multiplicity of terranes including ancient island and continental arcs, ophiolites, passive continental margins, Precambrian continental blocks and high-T/low-P metamorphic zones. Badarch et al (2002) describes the Gurvansaikhan island arc terrane (Fig. 2a) which lies in the central part of the southern domain in Mongolia. This island arc terrane is predominantly composed of Devonian to Carboniferous island arc volcanic rocks, and includes sporadic Ordovician and Silurian volcanics, as well as Ordovician to Carboniferous sedimentary rocks, and are extensively intruded by voluminous Permian-. Geological setting, magmatism and mineralization of the South Mongolia arerelatively well studied, but there is considerable debate regarding thePaleozoicMesozoic tectonic evolution, especially in the Mandakh area (Yakubchuk, 2002; Blight et al, 2010a,b). The KharmagtaiKhongoot-Oyut and the Tsagaan Suvarga CuMo porphyry deposits were dated as Middle Carboniferous to Early Permian, and LateDevonian to Early Carboniferous respectively (Rodionov et al, 2003)
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