黔西南下三叠统金矿床有机地球化学特征及其成矿意义

ORGANIC GEOCHEMICAL FEATURES OF GOLD DEPOSIT FROMLOWER TRIASSIC IN SOUTHWEST GUIZHOU PROVINCE AND THEIR MINERALIZATION SIGNIFICANCE

黔西南下三叠统浸染型金矿床的形成与泥灰岩和泥岩中的有机质具有密切的关系。浅海及湖相泥灰岩、泥岩中有机质较丰富，金的矿化程度较高，生物标志化合物研究表明，金的富集与菌藻类来源的有机质有关，菌藻类生物对矿源层的形成具有重要意义，而有机质演化产物不仅促使了金的活化迁移，有机质热解产物还促使金的沉淀和富集。因此，金的物源丰富和源于茵藻类的有机质较丰富的岩层分布区是金矿找矿的有利地区。

The formation of the gold deposit from Lower Triassic in southwestem Guizhou Province was closely related to the organic matter in the stmta. The higher the content of TOC in the strata of shallow sea fancies and lagoonal fancies is, the higher fhe degree of gold mineralization is. Research of biomarkers in the gold deposit shows that the enrichment of gold was related to the organs matter originated from bacterium and algae in sea. Bacterium and algae played an important role in the formation of gold source bed. The evolution products of organic mater led the gold remobilization and mdgradon, and the pyrolysis products of organic maser promoted the precipitation and enrichment of gold. Therefore, the stmta dch in organic matetra especially those originated from bacterium and algae in Lower Triassic . the favorable prospecting target of gold deposit.