УВС АЙМГИЙН ӨНДӨРХАНГАЙ СУМАНД ОРШИХ ДЭЛТИЙН CU-NI-ИЙН ИЛРЭЛИЙН БОДИСЫН БҮРЭЛДЭХҮҮНИЙ СУДАЛГАА

Abstract

A newly discovered the Delt occurrence cropping out in the northwestern part of the Zavkhan terrane nappefold megazone, composed of NW trending small tectonic blocks of amphibolite, granite-gneiss, schist, intruded by small reddish granite and diorite bodies and dykes of gabbro, gabbro-diorite. The main constituent minerals of the gabbro are plagioclase (40-45%), pyroxene (20-25%), olivin olivine (15-20%), amphibole (5%), biotite (5%), opaque minerals are magnetite, pyrrhotite, pentlandite, chalcopyrite, chromite, chalcocite, covellite, hematite, and accessory phases are apatite. The analysis was made using an X-ray Diffraction Instrument at Panalytical X’pert pro and Olympus BX-53, Motic BA310-pol at the the Geological Center for Research and Analysis and the Department of Geology and Geophysics of the School of Arts & Sciences, National University of Mongolia. The gabbro has Fe, Ni Cu, and Cr ore mineralization. The samples contain magnetite, pyrrhotite, pentlandite, chalcopyrite, chromite, and small amounts of sphalerite, covellite, and hematite as inclusions in host rocks or gangue minerals. Wide and narrow small veins and small discontinuous inclusions of second-type magnetite are formed around the serpentinized olivine. Based on the ore microscopic study, we can conclude that there is Fe, Ni Cu, Cr ore mineralization associated with ultramafic and mafic rocks.