The Copper Polymetallic Ore Geogas Field Research And Its Application To The Prospecting In Shannan Area Of Tibet

Since entering this century, with the rapid development of China’s marketeconomy growing demand for mineral resources as well as surface of the resourceexhausted, the issue of deep exploration is becoming a hot spot of Geology andmineral resources of scientific research and production work. Carry out deepprospecting work has a very important practical significance to solve the developmentof mineral supply and demand imbalance and even to the national economy. Afternearly30years of development, geogas method is applied more and more mature inthe search for concealed mineral. From the theory and practice of Geogas, geogassurvey can provide technical support for deep concealed ore body. The shannan areaof Tibet copper polymetallic ore integrated exploration area, including the copperpolymetallic ore field of zedang, the copper polymetallic ore prospecting ofkelu-wenqu and pulong-puxia,and the luobusha chromite metallogenic belt, etc,hasthe foundation of good work and great prospecting potential. In order to speed up toachieve the breakthrough in ore prospecting work, With support of the project of TheNational Natural Science Foundation of China:field of geogas on concealedgeological and fracture research (project Numbers:41074094) and project the nationalministry of scientific:“project of the deep detection technology andexperimental-radioactive detection technology and experiment about deepmetallogenic information the key ore set area of Nanling”(project numbers:SinoProbe-03-01-4C), project of China geological survey: the exploration andresearch of geological background, metallogenic conditionsand method of prospectingin copper metallogenic multi metal ore of Shannan Tibet（project numbers:12120113095700）. the work in accordance with the requirements of nationalgeological prospecting breakthrough strategy action plan and deep explorationtechnology and experiment, and on the basis of summarizing and analyzing theexisting geological results of prospecting area, making full use of Geogas method，based on the measurement of Geogas Nuri and Chengba copper polymetallic depositin Zedang orefield of Shannan Prefecture of Tibet as the object, to control of theknown copper polymetallic ore buried ore bodies and the main copper polymetallicore field deep extension and the breakthroughs in key areas, to establish a Geogas prospecting model of typical deposit and to sum up the characteristics of Geogas field,and to inference and interpret the anomaly unknown properties of the geogas，to putforward suggestions for the next work.In the South ore section of Nuri copper polymetallic deposit, there are twomeasuring lines:45#line and21#line. The length of45#is760m and has a total of20measuring points;21#measurement of length2000m, and a total of52measuringpoints. In the north ore section, There is one measuring lines: the20#line, the lengthis1040m, and has a total of26measuring points. The distance between the measuredpoints is40m.In the Chengba copper polymetallic deposit, from north to South arranged in fiveparallel lines,1#,2#,3#,4#lines, each length of the line is1320M,5#, length is1360m, each measuring line layout25measurement, the distance of each other is40m in key control area, But in non-key control region is80m.Among them,2#,3#,4#line through the North outcrop ore body, the1#,5#line distributed in the northernoutcrop ore body on both sides; the concealed orebody below3#line has beencontrolled by6drillings, which known as the copper (molybdenum) concealedorebody. Through researching geogas field of the known anomaly identification in thetwo areas, evaluate the prospecting significance in the unknown geogas anomalyzone.The results of the thesis were summarized as follows:1)anomaly geogas above the concealed orebodies have proven in the Nuri deposit andChengba deposit gas line, and abnormal elements corresponding combination. Itissurvey that applied The geogas to search for hidden ore bodies is effective in Tibetautonomous region, area Zetang orefield "Nuri type"Cheng Ba type” deposit.2) to enrage component percentage of each element in the study, can not directlyaccording to enrage some elements content in the composition of discretion todetermine whether this element enrichment, but it can be reference to each elementknown to mineralization anomaly area ratio to guide the anomaly area of inferunknown attribute is to mineralization anomalies.3) cluster analysis and correlation analysis reveals the relationship between theelements in anomaly geogas ore and the combination characteristic; ratio of elementcontent reveals the various elements in geogas group accounted for the proportion;REE reflects the material sources of Geogas anomaly area.4）The integrated use of multivariate statistical method, percentage of element contentand REE divide, as Evidence for inferente and interpretate the geogas anomalyproperties is feasible.5) according to the percentage of the elements in geogas, cluster analysis, correlation analysis and the content of REE and combined with the results of X fluorescencemeasurement of rock,45#line550m-710m anomaly area1and20#line440m-600manomaly area5in the Nuri deposit existing copper polymetallic concealed orebody ispossible.6) according to the elements in geogas content percentage, cluster analysis,correlation analysis and redistribution of abnormal area on the Chengba area, theanomaly area3, area8is the most promising for target of copper and molybdenumpolymetallic concealed ore bodies; the anomaly area0, area1, area7is secondaryprospecting target.7) through comprehensive analysis, anomal area6and abnormal area8in theophiolites suite may be enriched chromium ore.