韶山银田寺海泡石粘土矿床控矿因素及成因探讨

DISCUSSION ON THE DEPOSIT-CONTROLLING FACTORS AND METALLOGENIC CAUSE OF YINTIANSI SEPIOLITE CLAY DEPOSIT IN SHAOSHAN

矿体赋存于二叠系下统茅口组含泥质碳酸盐岩段内，呈似层状、透镜状产于风化带中。控矿因素主要为岩石建造、地形及风化带发育程度等；其原始成矿时期（早二叠世晚期）的岩相古地理为低纬度带的相对封闭的浅海或海湾，沉积环境为碱性介质中低能水动力条件环境，成矿物质主要来源于陆源剥蚀。粘土型海泡石矿是由含海泡石的原岩经长期的物理、化学风化改造而成的。

the ore-body occurred in the zone of weathering, in argillaceous limestone belt in Maokou Group of Lower Permian system, which shaped as stratoid and lenticular structure. Ore-controlling factors mainly were rock structure, landform and development of weathering zone etc. Lithofacies paleogeography of original metallogenic period (the later period of Early Permain Epoch) was comparatively closed shallow sea or gulf; sedimentary environment was medium or low-energy hydrodynamic circumstance; metallogenic materials came mainly from terrigenous erosion. Clay-type sepiolite deposit was formed from sepiolite-bearing original rock, which suffered from long-term physical, chemical weathering alteration.