| Waist clams copper-silver deposit located in the Ningxia Hui Autonomous Region in south-central Shanxi Lu Xiang Changle Town. The area is a large area in North formations, Qin Qi Kun stratigraphic zones, Qilian - North Qinling stratigraphic area, southern Ningxia formation area; their tectonic position of Tarim - NCB ALASHAN southern edge of the western margin of the Ordos block and Kunlun - North Qilian fold belt with the eastern end of the Qinling active compound site. On the basis of the previous system collected data on the deposit conducted field research, microscopy and geochemical tests, analyzes the mineralization geological features, genesis and metallogenic conditions discussed prospecting mark.Through this work, the paper made the following main results and understanding.1. waist clams copper and silver deposit copper silver (of) are hosted in the Devonian system Laojunshan second rock section (D3l2) and Lower Carboniferous former Montenegrin group (C1q) (IV orebody all this occurrence) strata, and mainly focus on the third floor (D3l2b) system Laojunshan second group on the rock section Devonian (Ⅶ orebody average occurrence here) and the fourth layer (D3l2c) (copper silver layer). Wherein the fourth layer (D3l2c) of the main mineralized zone layer, the region Ⅰ,Ⅱ, Ⅲ, Ⅴ, Ⅵ were orebody occurrence here, the ore-bearing rock is gray thick layer of calcareous cementation of copper mineralized quartz sandstone, light purple thick layer of copper mineralization quartz sandstone. The set of thick rock series 0-53.8m, rock color more complex, copper mineralization generally located mauve colored layers alternating layers with a light-colored layer, the color is lighter, better mineralization.2.the main types of copper and silver ore oxide ore and sulphide ore. Oxidation Ore minerals are mainly malachite, azurite, chalcocite occasionally gangue minerals are quartz and minor feldspar; sulfide ore ore minerals are chalcopyrite, bornite, chalcocite, Scarce pyrite, galena, sphalerite, non-metallic minerals are quartz, calcite, tourmaline, chlorite, zircon.3. Xiangshan area late diagenesis enrichment and alteration of the sandstone-type chalcopyrite and galena hydrothermal copper mineralization, with sedimentary experienced three stages superimposed diagenetic enrichment and hydrothermal alteration of late. However, the performance of the three stages of mineralization intensity is different in different regions. Da Nang sub-copper deposit back as ancient underground lake water jets - reworked sandstone sedimentary copper deposits, the genetic type of sedimentary and hydrothermal alteration type two kinds.4. metallogenic conditions of the area concerned mainly with the following conditions:(1) stratigraphic ore control; (2) sandstone copper enrichment (silver) ore facies relations with ancient geography; enrichment (3) sandstone copper (silver) mine and sedimentary relationships; same sedimentary and diagenetic enrichment (4) sandstone copper (silver) mine; (5) combination of red sandstone layer of copper (silver) mine; provenance (6) sandstone copper (silver) mine.5.prospecting indicators:(1) stratigraphic markers, waist Da Nang sub copper-silver deposit hosted in the Devonian system with light-colored rock formations of red rock formations change, are oxidation - reduction of sedimentary environments, are on the same stratigraphic zone prospecting indicators; (2) rock logo, waist Da Nang sub copper -silver deposit hosted in the Devonian mineralized layer system, the mineralized rock is light gray medium - thick layer of feldspar quartz sandstone, mineralized layer on the lower part of the red rocks, the Devonian system of light-colored sandstone rock prospecting mark dissection is mine. (3) mineralization signs, mine surface mineralized layer generally have different levels of petrochemicals and peacock blue copper mineralization, petrochemical and peacock blue copper mineralization is a direct sign mine prospecting. Mineralized layer outside the mine (4) structure constructed signs logo, mineralized bodies hosted in Devonian and Carboniferous near the contact surface, the contact relationship unconformity or overthrust faults, lithology overlying Carboniferous limestone or marl, external structure can be used as a reference mark prospecting area. (5) Ⅰ,Ⅲ structure of the internal structure of the strength of the mineralized orebody mineralization is closely related to the internal structure of the mineralized structure flag mine layer, calcareous cementation, the coarse-grained structure, thick layers or massive structure internal voids, joints and fissures mineralization is better, the internal structure of the mineralized layer structure can be used as an indirect prospecting mark. |
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