青海省都兰县肉早某日地区物化探异常特征及成矿远景分析

Ore-forming Prospect Analysis and Characters of Geophysical and GeochemicalAnomaly of Roozaori Area in Dulan County, Qinghai Province

勘查区位于东昆仑弧盆系东段,属昆中银、金、铜、铅、锌成矿带。区内圈出3处1∶2.5万地球化学异常(GA1、GA2、GA3)及6处1∶5000土壤异常(HT01~HT06),在异常区内圈定6条矿化蚀变带,矿体12条,矿化体21条,物探异常表现为中低阻中高极化异常,异常由中心向外围具中高温-中低温的成矿元素分带,该区域矿化蚀变与二叠纪—侏罗纪中酸性岩及岩脉的侵入有关,为成矿带提供了热液和物质来源,从而形成了斑岩型加浅成低温热液型银多金属矿床。

The exploration area is located in the eastern part of east Kunlun arc Basin system,which belongs to the Kunzhong silver,gold,copper,lead and zinc metallogenic belt.There are three 1∶25000 geochemical anomalies(GA1,GA2,GA3)and six 1∶5000 soil anomalies(HT01~HT06)delineated in the anomaly area.Six mineralized alteration zones include 12 ore bodies and 21 mineralized bodies,which were delineated in the anomaly area.The geophysical anomalies showed middle-low resistivity and middle-high polarization anomalies.It is considered that the mineralization alteration in this area is related to the intrusion of Permian-Jurassic intermediate-acid rocks and dikes,which provides hydrothermal source and material for the metallogenic belt.It forms the porphyry type and epithermal low-temperature hydrothermal silver polymetallic deposit.