云南建水荒田铅锌矿矿床地质特征研究及成因探讨

Geological characteristics and genesis of Huangtian Pb-Zn deposit in Jianshui of Yunnan

荒田铅锌矿床位于官厅铅锌成矿带,其矿体赋存于下二叠统玄武岩组中段下层P1β2-1与茅口组上段P1m2之间的玄武质、灰质角砾岩层中,常富集在背斜的两翼和向斜的槽部,严格受层位、岩性和褶皱构造的控制。矿床与晚二叠世海相基性岩浆喷发有关,后经火山沉积-岩浆期后热液叠加以及多期次构造运动对成矿物质的改造富集。故矿床应属火山沉积-岩浆期后热液叠加-层控矿床。

Huangtian Pb-Zn deposit is situated in Guanting Pb-Zn metallogenic belt,and its orebody occurs in the basaltic and gray breccia layer between the lower layer of middle Basalt Formation(P1β2-1)and the upper Maokou Formation(P1m2)in lower Permian system.The orebodies mainly enrich in the two limbs of the anticline and the trough of the syncline and are strictly controlled by horizon,lithology and fold structure.The deposit is related to marine basic magma eruption of late Permian Epoch.Afterwards,ore-forming materials are reworked and enriched by volcanic sedimentarypostmagmatic hydrothermal superposition and multiphase tectonic activities.Therefore it is believed that the deposit is a volcanic sedimentary-postmagmatic hydrothermal superposed-stratabound deposit.