摘要
安徽驼背坑地区位于石台—青阳成矿区南段。在该区1∶50 000水系沉积物测量成果的基础上,选取异常较好的地段进行了1∶10 000土壤地球化学测量工作,通过分析元素空间分布特征及地球化学特征,圈定了Au异常6处,W异常4处,Mo异常6处,Bi异常5处、Sb异常8处、Ag异常11处,据此在驼背坑以北一带进一步圈定了以W、Mo、Au、Bi为主的组合异常带。经分析认为,该异常带出露的地层主要为寒武系西阳山组,有多处花岗斑岩岩脉出露,推测异常与斑岩成矿有关,为寻找钨钼(金)异常的重要成矿区。针对土壤地球化学异常套合较好的地段开展了岩石剖面测量和槽探工程,验证异常的矿质来源,分析表明:(1)W、Mo、Au、As、Bi、Cu、Pb、Zn原生晕异常和次生晕异常在空间上与区内地层分布一致;(2)原生晕异常自脉岩至围岩总体呈低温至高温的分带特征,斑岩岩脉为W、Mo(Au)成矿提供了热液动力和物质来源。在上述分析的基础上,进一步分析认为:(1)区内黄铁矿化、褐铁矿化较明显,经异常验证,发现W-Mo矿化体,但与土壤地球化学异常强度和规模有一定的出入;(2)石台地区位于下扬子地层分区与江南地层分区的过渡带,岩浆活动频繁,该区中酸性—酸性侵入岩具有较好的找矿前景。
Tuobeikeng area in Anhui Province is located in the southern section of Shitai-Qingyang Metallogenic region. Based on the 1∶ 50 000 stream sediment survey results of the area,the better performance of anomaly areas are selected to conduct 1∶ 10 000 soil geochemical survey work,combing with analysis results of the elements spatial distribution characteristics and elements geochemical characteristics,6Au anomalies,4 W anomalies,6 Mo anomalies,5 Bi anomalies,8 Sb anomalies and 11 Ag anomalies are delineated,besides that,the association anomaly belt mainly for W,Mo,Au and Bi is delineated in the northern part of Tuobeikeng area. The anomaly belt characteristics analysis results show that emergence strata of the anomaly belt is mainly for Xiyangshan formation of Cambrian System,the granite prophyry veins are exposed in the many points of the anomaly belt. It is inferred that the anomaly belt is related to porphyry mineralization,it is the important metallogenic area of the prospecting of W-Mo（ Au） anomalies. The rock profile measurement and pit engineering are conducted in the areas that the better nested effects of the anomalies are existed so as to verify the metallogenic material source of anomalies. The study results show that：（1）the distribution characteristics of the primary halo anomalies of W,Mo,Au,As,Bi,Cu,Pb and Zn and its secondary halo anomalies are consistent with the strata distribution characteristics;（2）from vein rock to surrounding rock,the zoing characteristics of the primary halo anomalies are presented from low temperature to high temperature,hydrothermal dynamic and material source of W-Mo（ Au） metallogenic are provide by porphyry veins. Based on the above analysis results,the further analysis results show that：（1）the phenomenons of pyritization and ferritization are significant in the study area,by verification,the W-Mo mineralized body is found,but it not completely consistent with the strength and size of the soil geochemical anomalies;（2） Shitai area is located in transition zone of Yangzi strata partitioning and Jiangnan strata partitioning,the magmatic activities are happened frequently in the area,the prospecting potential of the intermediate acidic-acidic intrusive rocks in the area is good. The above analysis related to the geochemical prospecting potential of of W-Mo（ Au） in Tuobeikeng area can provide some reference for the further prospecting and exploration work in the area.
作者
于勤勤
Yu Qinqin(Institute of Geophysical and Geochemical Exploration Technologies of Anhui Provinc)
出处
《现代矿业》
CAS
2017年第4期22-27,共6页
Modern Mining
基金
安徽省地质公益性项目(编号:2009-08)
关键词
水系沉积物测量
土壤地球化学测量
空间分布特征
地球化学特征
组合异常带
找矿前景
Stream sediment survey
Soil geochemical survey
Spatial distribution characteristics
Geochemical characteristics
Association anomaly belt
Prospecting potential
