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Ponte Academic Journal
Sep 2016, Volume 72, Issue 9

REVIEW OF THE PORPHYRY ORE DEPOSITS IN THE TETHYAN OROGENIC BELT-A CASE STUDY OF THE BANGPU MO-CU PORPHYRY ORE DEPOSITS, TIBET, CHINA

Author(s): H. A. Ahmed ,Chang-Qian Ma, (a,b) Chang-Qian Ma, (a) Lian-Xun Wang, (a) Mukhtar Habib, (c) Kabir Shola Ahmed (c)

J. Ponte - Sep 2016 - Volume 72 - Issue 9
doi: 10.21506/j.ponte.2016.9.13



Abstract:
Abstract The occurrence of the post-collisional Bangpu Mo-Cu porphyry ore deposits has been reviewed. The Cenozoic deposit is located within the Gangdese Porphyry Copper Belt (GPCB) in Tibet, part of Himalayan (Tethyan) Orogenic Belt, with an estimated resource of over 800,000 and 200,000 tons of Mo and Cu respectively, and an approximate grades of 0.089% Mo and 0.32% Cu. The Mo reserves within the Bangpu deposit accounts for about 60% of the known Molybdenum reserve in Tibet. The mineralization is hosted by Mid- Miocene porphyritic monzogranites, diabase and diorite porphyry and is controlled by extensional structures and are distributed along E-W fault and fracture zones. Isotopic and fluid inclusion analyses suggest that the ore fluids might have been derived from degassed mafic magmas that originate from an upwelling asthenospheric mantle. The Redox state of the magma could be viewed as an important factor in the formation of Mo rich and Cu poor in the study area. Several studies have indicated that the Bangpu porphyry Mo-Cu deposit was generated by post-collisional crustal extension that took place during the Indo-Asian collision that started at 65 Ma. In future, a rigorous fluid-rock interaction studies and determination of Redox state of magma and emplacement mechanisms in the region would give a better understanding of the genetic model that resulted in the formation of Mo-Cu deposits in the area and perhaps a great potential for discovery of additional new deposits in the Tibetan sector of the Tethyan Orogenic Belt. Keywords: Tethyan Orogenic Belt, Bangpu, porphyry Mo-Cu ore deposits, Gangdese, Magmatic degassing.
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