| Jiawu gold deposit located in Tongde- Zeku indosinian C u, Pb, Au metallogenic belt the in the northeast qinghai-tibet plateau. On the basis of predecessors’ work, It was found that the People’s Armed Police Force Gold strategic geological investigation and study work, and that the further exploration work can be significant prospecting breakthrough. However, Armed police force gold mining area from 2008 to 2011 in gold exploration work, ore prospecting effect of the trenching exploration, test pitting and borehole surveying are not ideal, and produce doubt about prospecting situation, On the basis of comprehensive analysis of predecessors’ achievements, combined with the actual field investigation results, and carry out the geological and geochemical characteristics analysis with Jiawu area, in order to reveal its further prospecting potential. The main achievements of this paper are as follows:1、Research results of the 1:200000 regional geochemical characteristics show that: In the Lower- middle Triassic Longwuhe group(T1-2l) formation, Au, W, As, Sb, Hg, Bi are relatively rich, and discrete degree is bigger, it is had the potential formation unit to find gold, tungsten, antimony ore; elements are divided into six combinations in this area, among them, Au-Sb-Ag-As-W-Bi-Cd-Sn combination mainly reflect the characteristics of the Au mineralization enrichment, indicator elements can be used as the study area to find gold; circle seven synthetical anomaly in region, among them, Ht1, Ht2 comprehensive anomalies has a good prospecting potential. especially, Ht1 comprehensive anomaly with Jiawu gold deposit, it have large scale and high strength, significant accumulation centers, element combination is good, indicates that the deposit further prospecting potentiality. In addition, Ht5 comprehensive anomaly has prospecting potential, Ht3, Ht6, Ht7 comprehensive anomaly has certain hope of prospecting.2、Geological characteristics of the research results show that the mining area : Mining area formation in the Lower- middle Triassic longwuhe group a set of hard sandy river group feldspar-argillaceous clastic rock is given priority to, including carbonaceous slate metamorphic sandstone section of the erosion of middlings was stronger, is the main mining seam position. Structure in the mine development generally, to the NW and EW fracture for the mining area to the fracture, the major ore-controlling and ore control the output of the ore bodies; At the same time, add my plunging anticline flanks of ore body has significant control effect. Mine magmatic rocks is given priority to with the indosinian period acidic intrusive body, mainly for the granite, diorite rock and granite dike are closely associated with mineralization.Gold orebody mainly originated from the carbon plate between rock fracture zone, carbonaceous slate clip sandy slate and carbonaceous slate and granite rock body contact with; ore types in cataclastic altered rock type and quartz vein type is given priority to; there are pyrite and limonite mineralization type, poison placer, stibnite, etc; Wall rock alterations are silicification, carbonation, sericitization, etc.3、Mining the characteristics of element enrichment and variation: Au, Ag, As, Sb, Bi, Cd, Pb, W and enrichment coefficient of variation coefficient, respectively is 1.27~37.86 and 1.81~11.19, shown that these elements are obvious enrichment condition and it s uneven distribution, indicate that in the local enrichment of possibility is very large; Granite porphyry, quartz vein, tectonic fracture zone,Au enrichment coefficient and the relative variation coefficient respectively is 1.41~1.30 and 1.68~3.32, shown that these geological unit powerful influence on the migration enrichment of gold.4、Elements are divided into three combinations in this mining area. Among them, Au-Ag-As-W-Cd-Pb combination and regional Au-Sb-Ag-As-W-Bi-Cd-Sn combination is similar, mainly reflect the characteristics of the Au mineralization enrichment, they can be used as the study area to find gold.5、Geochemical characteristics of REE show that: Sedimentary rock of the mining area is the normal shell source causes, and they are similar with surrounding rock of the forest type gold deposits in geochemical characteristics of REE. Mining area under the action of magmatic rocks of continental crust subduction of the products, and deep substance(lower crust, mantle) involved in the magma activity; Cataclastic altered rock type ores that strata sedimentary rocks by ore-forming fluid weaker role transformation of the product, granodiorite and quartz vein type ore mining area may be the same material source.6、Deposit element horizontal zoning show that: ore body front elements is As, Sb, Hg, Ba, ore- forming elements is Au, Ag, Cu, Pb, zinc, W, the tail element is Cd, Bi, Mo, N i, Co. At the same time, It also show that lower fracture alteration belt of Xiaoquru is the main location looking for gold. |
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