Characteristics of geophysical and geochemical anomalies and prospecting direction in Dongga deposit,the Xiongcun Ore Deposit Cluster,southern Lhasa Terrane
The Dongga Au deposit is located in the Xiongcun Ore Deposit Cluster,at the southern edge of the central part of the southern Lhasa Terrane,and is an early discovered gold deposit in Xizang(Tibet).However,previous studies have mainly focused on the porphyry deposits in the Xiongcun Ore Deposit Cluster,and the extent of research on the Dongga Au deposit is not enough,especially is lack of a comprehensive study on the ore prospecting direction of the Dongga Au deposit.In this paper,based on a systematic summary of the geological characteristics of the Dongga Au deposit,the results of soil geochemical measurements and ground-based high-precision magnetic measurements are integrated to explore the direction of the Dongga Au deposit.The gold ore bodies found in the Dongga Au deposit are hosted in tuffs of the Xiongcun Formation,which are strongly pyritic sericitized,and belongs to the hydrothermal vein type gold orebodies in the periphery of porphyry copper—gold metallogenic system.The mineral and chemical anomalies of the Dongga Au deposit are very similar to the No.2 deposit found in the Xiongcun Ore Deposit Cluster and are spatially coherent.Combining the geological characteristics of the deposit with soil geochemical and geophysical anomalies,this paper suggests that the No.2 deposit contains mineralized porphyry extending southwards to the deeper part of the Dongga Au deposit,and that there is great potential for finding porphyry-type ore bodies at the deeper part of the Dongga Au deposit.This thesis is an important guide for the future exploration of the Dongga Au deposit.
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