山东胶莱盆地——一个地洼盆地结构与金矿形成关系研究

A STUDY OF METALLIZATION RELATION BETWEEN TEXTURE AND GOLD DEPOSIT IN A DIWA BASIN (JIAOLAI BASIN)

山东胶莱盆地结构由前地槽及地槽、地台及地洼构造层组成 ,实为一地洼盆地。盆地所有金矿均为地洼活动的产物。在地洼活动初期 ,形成胶莱盆地并沉积下白垩统莱阳群一段含碳岩系矿源层 ;中期 ,地洼活动加强 ,盆地沉积大量粗碎屑岩 ,有机质成矿作用形成顺层展布的金矿体 ;晚期 ,地洼活动进一步发展 ,叠置在先期金矿带上的新聚矿体系形成 ,成矿热液除改造原有金矿床外还形成新的金矿床。

In Shandong Province, the Jiaolai basin is made up of structural layers of pregeosyncline, geosyncline, platform and diwa. Actually, it is a diwa basin. All of the gold deposits are a product of diwa activity. The initial mobility period of diwa activity saw the formation of the Jiaolai basin and the deposition of the carbonaceous source rock in the first member of the Lower Cretaceous Laiyang Group. In the middle period, diwa activity strengthened, coarse clastic rocks were deposited, and metallization of organic matter formed gold bodies distributed along rock bed. In the late period, diwa activity further developed, a new ore collecting system telescoping in the previous gold ore zone was formed, and ore forming hydrothermal solution formed new gold deposits besides reforming former gold deposits. Finally, they make an outline of gold deposits of the Jiaolain basin.