Japan Geoscience Union Meeting 2019

Presentation information

[E] Poster

S (Solid Earth Sciences ) » S-MP Mineralogy & Petrology

[S-MP29] Oceanic and Continental Subduction Processes

Tue. May 28, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:REHMAN Ur Hafiz(Department of Earth and Environmental Sciences, Graduate School of Science and Engineering, Kagoshima University), Tatsuki Tsujimori(Tohoku University), Chin-Ho Tsai(Department of Natural Resources and Environmental Studies, National Dong Hwa University), Kazuaki Okamoto(Faculty of Education, Saitama University)


*Undarmaa Batsaikhan1, Noriyoshi Tsuchiya1, Masaoki Uno1, Yukio Isozaki2, Uyanga Bold2, Hikaru Sawada2 (1.Graduate School of Environmental Studies, Tohoku University, 2.Graduate School of Arts and Sciences The University of Tokyo)

Keywords:Petrochemistry, Geochoronology, Southeastern Mongolia, Porphyry Copper deposits

The southeast Mongolia has become a major survey area for unraveling the Paleozoic tectonic evolution because Mongolia occupies the central part of the 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 and where porphyry Cu deposits occur. The late Paleozoic magmatic rocks are widely distributed in the Mandakh area which is located in the Curvansaikhan and Manlai terrains, in the southeast Mongolia. We will discuss petrochemical features, mineral assemblage and new geochronological constrain of magmatic rocks in the Mandakh area. Furthermore, we compared petrochemical characteristics of the Mandakh area with Tampakan deposit (Philippines), Cerro Colorado deposit (Chili) and negative criteria of Cu deposits (Japan) in order to characterize potential of the porphyry copper deposit in Mandakh area.

The Mandakh area’s igneous rocks the geochemical features 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 alkali in composition. Although Devonian and Carboniferous igneous rocks in the Mandakh area are a little different each other, these igneous rocks are possibility copper deposits as suggested by petrochemical comparisions with bonanza copper deposits in the world.