丰县师砦坳陷石盐矿床成矿特征探讨

Probe into Halite Deposit Ore-forming Features in Shizhai Depression,Fengxian County

师砦坳陷为一含石盐矿资源储量20多亿吨的大型矿床,是燕山期晚期形成的箕状坳陷,这个时期的构造运动为盐类沉积提供盆地的同时也提供了物质来源,并在适宜的气候下蒸发沉积;大量地表风化的盐类物质被地表径流带入坳陷,深部古卤水亦可循断裂或岩浆岩通道上升,而排除海侵带来物质来源的可能;坳陷内的盐系地层韵律特征明显,每一级韵律皆由更小的韵律组合而成。分析师砦坳陷的构造、物质来源及韵律特征以期对今后的盐类找矿工作有所帮助。

In the Shizhai depression has a large sized halite deposit with resources and reserves 2 billion tons more.The dustpan-like depression is formed during the late Yanshanian.At the same time as the tectogenesis provided basin for halite deposition also provided material source,evaporated and deposited under appropriate climate conditions.Massive surface weathered salt substances have been brought into the depression through surface runoff,deep part paleo-brine can also ascend along fractures or magmatic rock channels,yet excluded possibility of transgression brought materials into.Saliferous strata in the depression have obvious rhythmicity,every level rhythmic layer is assembled by lesser rhythmites.The analysis for Shizhai depression structure,material source and rhythmic features is to assist hakite prospecting henceforth.