Objective
A geological study has been carried out of the Hei Shi Chuan district, near Baiyin, Gansu province, China.
The recorded mineralisation can be classified into 3 main types, not taking into account late tectonic remobilisation: Kuroko type polymetallic massive sulphides in the Baiyin mining district; Besshi type copper zinc bearing sulphide lenses associated with cherts and metabasalts at the end of the first cycle; Sedex type lead zinc mineralisation hosted by dark shale and chert at the end of the second cycle, then strongly remobilised during Caledonian movements. Lead isotopic compositions of these 3 types of mineralisation are very different and confirm that they correspond to independent metallogenic events related to various Early Paleozoic geotectonic settings.
A regional stream sediment geochemical survey isolated 2 first priority polymetallic anomalies in favourable geological settings: the large lead zinc (copper antimony) Xing Qian Dong-Lao Qian Dong anomaly, and the well marked copper zinc lead silver Lue Er Duo Shan anomaly which could correspond to sulphide mineralisation associated with chert and basalt at the end of the fourth cycle. Other second priority anomalies were field checked and found to correspond either to lead silver bearing late faults in Caledonian granite, or to lithological anomalies (copper in basalts) or to industrial pollution.
Twenty tow geophysical profiles were surveyed using various electrical, magnetic and electromagnetic methods in 5 selected areas where anomalies were detected. Modelling of these anomalies together with detailed geological and structural interpretation display conductive bodies which could correspond to sulphide mineralisation associated with metacherts and represent first priority drilling targets.
Topic(s)
Data not availableCall for proposal
Data not availableFunding Scheme
CSC - Cost-sharing contractsCoordinator
75739 Paris
France