2009•Xinjiang GeologyRequires access
GEOLOGICAL CHARACTERISTICS AND PROSPECTING POTEN-TIAL OF COPPER-MOLYBDENUM MINERALIZATION IN LALISGAR,XINJIANG
Songlin Cheng, Tu QiJun
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Abstract
Lalisgar copper-molybdenum deposit is a new porphyry deposit discovered by Xinjiang Bureau of Geology and Mineral Resources in the western Tianshan area in recent years.The copper-molybdenum deposit is located in the south side of west part of Boluokenu Paleozoic compounded island-arc zone which belongs to Yili-Isec micro-plate of Kazakstan-Jungar plate.For the outcrop in the area,there are Early Paleozoic neritic facies fine grained clastic and carbonate,and Devonian and Carboniferous acid,intermediate-acid magmatic rocks invaded them.Late Ordovician and Late Silurian strata are found in the mine area and there are adamellite and granodiorite porphyry intrusions in them.Ore bodies are hosted in Late Devonian granodiorite porphyry and its external contact zone(hornfels siltstone).The granodiorite porphyry has a property of mantle-derived magma,in which silicification,k-feldsparization and biotitization were formed.Mineralization zoning from the rock to wall rock is successively molybdenum,copper,lead and zinc mineralization.The ore deposit has lower quality,but uniform mineralization,and ore minerals are simple,which mainly are molybdenite and pyrite.It is characteristic of porphyry mineralization,and some mineralization clues were found at the external contact of the deposit.Based on comprehensive analysis of characteristics of geological mineralization conditions, such as mantle-derived small rocks invaded Silurian low metamorphic fine grained clastic in the ore field,geochemical anomalies of copper-molybdenum assemble,electric anomalies of high polarization,intermediate and high resistance and the results of current explorations,it is determined that the ore field has good mineral potentials related to magma and the west of the mineralized porphyry also has great potentialities in deep prospecting because of its lower denudation degree. The peripheral area of the porphyry has a good future of looking for copper,lead and zinc deposits.