陕西省旬阳县罗家山-孟家沟锌矿地质特征及成因探讨

Geological Characteristics and Genesis of Luojiashan-Mengjiagou Zinc Deposit in Xunyang County, Shaanxi, China

陕西省旬阳县罗家山-孟家沟锌矿赋存于下志留梅子垭组第三岩性段、中泥盆石家沟组第三段第一层的绢云千枚岩、钙质千枚岩、灰岩中,矿体呈似层状顺层产出,矿体分布受构造控制明显。地层中Zn背景值较高,具有矿源层的特征。沉积成岩后经断裂构造活动伴随热液的参与,使围岩中的成矿物质活化再次迁移富集成矿。属沉积变质-热液改造型锌矿床。

Luojiashan-Mengjiagou zinc deposit in Xunyang county Shaanxi province.Zinc ore occurs in sericite phyllite, calcareous phyllite and limestone in the third lithologic section of Silurian Meiziya formation and the first layer of the third section of Middle Devonian Shijiagou formation.The ore body is produced in a quasi layered bedding manner, and the distribution of ore body is obviously controlled by structure.The zinc background is high value in the strata and has the characteristics of the source bed.After sedimentary diagenesis, the ore-forming materials in the wall rock were activated and migrated and enriched again by fault tectonics and hydrothermal participation.It is a sedimentary metamorphic-hydrothermal transformation zinc deposit.