铜-凤-三-丹汞矿带成岩作用

DIAGENESIS OF MERCURY ORE ZONE IN TONGREN-FENGHUANG—SANDU—DANZHAI REGION

李振泽 周棣康

Li Zhenze Zhou Dikang

铜(仁)-凤(凰)-三(都)-丹(寨)寒武系碳酸盐岩,属台地前缘斜坡相带,为汞、油最佳聚集部位,蕴育了全国最大的汞矿带,保留了数千万吨沥青.成岩作用有:生物作用、胶结作用、压实作用、早期溶解作用、新生变形、白云岩化作用、压溶作用、交代作用、晚期溶解作用等.早期溶解作用形成于泥盆—石炭纪,对聚油十分有利,晚期溶解作用形成于白垩纪末,对形成汞矿十分有利.

Cambrian carbonate rocks in Tongreni-Fenghuang-Sandu-Danzhai regionbelongs to front slope facies of platform, and is in optimal position for mer-cury and oil accumulation. The diagenesis of the carbonate rocks include bio-genic agency, cementation, compaction, early-stage dissolution,neomorphsmi,dolomitization, pressure solution, metasomatism and late-stage dissolution.The early-stage dissolution and dolomitization took place in the Devonian-Carboniferous Periods and are favourable for oil accumulation; the latestage dissolution happened in Late Cretaceous and is favourable for mercuryaccumulation.

10.11743/ogg19880416