Metallotectonic Analysis And Metallogenic Prognosis In Shuihekou, Funing, Yunnan Province

Shui Hekou gold mine is located in Tian Peng, Funing, belongs to the southwest of "Golden Delta" of Yunnan Guizhou Guangxi province. Since the 90’s of last century, several micro-disseminated gold deposit have been found in southeast area of Yunnan province, showing a good prospecting potentials. In recent years, along with the gold exploration and development efforts continue to strengthen, the minerals of Permian, Triassic, Devonian and other main ore bearing stratum are dwindling, gold exploration has gradually shifted to look for concealed deposit, indiscernible deposit and deep deposit. The guidance of the metallogenic theory is increasingly outstanding in prospecting work, exploration technology plays a key role in the prospecting, Data processing method of geochemical exploration is more and more important. In spite of these, the research degree of disseminated gold deposit in Cambrian strata of Southeast Yunnan is still low.This article is an attempt to find gold mine in Cambrian strata in southeast Yunnan. This artcle is based on large amount of regional metallogenic background information, take tectonism as the main line, take the regional metallogeny, remote sensing geological theory as guidance, base on prospecting practice in Wenshan-Xichou Au-As-Sb-Cu-Pb-Zn metallogenic belt during Graduate student period, summarized the geological features of typical micro-disseminated gold deposit, ore controlling factors and metallogenic law in this area, and find out the fault structure is the most important ore-controlling factor. For the forecast area is within the Karsts landscape area where the fracture is always difficult to recognize, therefore, on the basis of previous works, this article makes use of ETM+ Remote sensing image to explain regional fracture and to better known the area’s influences on the region hierarchical controlling. Finally, we find out that one gold mine, the layer and the distribution of the rock mass are all in the control of the fracture.In the process of geological survey in mineral deposit, we quickly extract information by Remote sensing image and field survey. Basing on minute field survey, further using DEM and OLI, we get the linear structure information of the forecast area so as to extract iron alteration and structure information by PCA. As the previous geological work in prediction area is almost blank, and the mineralization information is not obvious,1:10000 soil geochemistry about 17.30km2 is imple-mented in this area, while traditional statistical methods and singularity analysis methods are used to extract soil geochemical anomalies. It’s found that the characteristics such as the space distribution, zonation and concentration center of pedogeochemical anomaly are all strictly controlled by geological structure. By detailedly stating the reflection of the comprehensive information of geology, chemistry, remote sensing to the geologic structure, and synthesizing metallogenetic data collected by "geology, chemistry, remote sensing", the integrated anomaly, accroding to which the field anomaly inspection is carried out, is outlined. With the inspection, an ore body is found, which confirms the pertinence of this paper’s clue for prespecting. Based on the scientific prespecting principles of " predictionâ†' verificationâ†'upplementaryâ†'forecast", the author have done detaild research on this ore body and found out its ore-controlling model as well as supplemented prospecting guide. Results of this text are as follows:1. Characteristcs on grading control of gold deposit is obviously in southeast Yunnan. It has been found that the large-medium mineral deposits are all near to great deep fault belt. The prediction district is located in Wenshan-Funing tectonic metallogenic belt which is composed with Guangnan-Funing fault and Wenshan-Malipo fault. Through the comparatively research of the typical mineral deposits in this area, there is no specificity in ore-hosting rock of micro-disseminated gold deposit, Gold deposit are output from stratum and igneous rock in verifying degree each era. Impure carbonate rocks and advantageously fracture tectonic is gainful mineralize place.2. By the mutual influence of Guangnan- Funing and Wen-Ma fault, the fracture mainly developed to North- West, The prediction area is cut by two large regional faults which both are NW trending faults to be Puyang fault and Mulai fault.These two fracture are basically parallel to the Guangnan-Funing fault and through the middle and tail of Wenshan-Funing arc fault,are the main control structure of prediction area.The exposed strata in prediction area is mainly Middle Cambrian series,the main lithologic is carbonate-clastic rocks combination.They Belong to the advantageous ore lithology.There is a large gold mine called Gedang gold deposit lies about 14 kilometers northeast of prediction area,but the previous work in this area is still blank.3. By geological mapping, remote sensing geology, soil geochemical survey and other methods to obtain the mineralization anomaly information in prediction area, and respectively using traditional method and singularity theory to delineate the soil geochemical anomalies.Combine with geological, geochemical and Remote sensing datas boldly prediction, delineate the integrated anomaly. Through a verification of Integrated anomaly, a gold ore body has been found, and subsequent validation project is launched.Base on scientific exploration principle of "predict- verify-supplement- predict", point at this ore body,the author did a detailed work,considered the structure as main ore controlling factor.Through the joint caculation and crustal stress recovery, rocks around this ore body firstly suffered by NW-SE principal compressive stress, prodce the Tensile NW faults, then transformed by the nearly EW compressive principal stress.