滇东南晚古生代—中生代沉积盆地内等时性地层界面及其与金矿成矿关系

ISOCHRONOUS STRATIGRAPHIC INTERFACES AND THEIR AU METALLOGENESIS IN LATE PALAEOZOIC-MESOZOIC SEDIMENTARY BASIN OF SE YUNNAN

等时性地层界面是沉积盆地成长过程中的主要记录之一。在滇东南晚古生代—中生代沉积盆地内 ,根据其成因不同可划分为 :侵蚀不整合面、无沉积间断面、火山活动标记面和岩性岩相转换面等四种。勘查及研究成果表明 ,在上述四种界面及其附近大多有金的异常层或金的工业矿体存在 ,尤以侵蚀不整合面及其附近金矿化强度最大。它们的耦合出现决不是偶然的巧合 ,而是有着内在的联系 ,是本区金矿成矿规律时控性的一种宏观表现。

Isochronous stratigraphic interfaces are one of the most important marks of developing process of a basin. Based on a study of the late Paleozoic to Mesozoic sedimentary basin of southeast Yunnan, they can be subdivided into four genetic types: (1)tectono erosional unconformities, (2)non depositional hiatus, (3)marker of volcanism and(4)transformation interface of rock and lithofacies, which are all closely related to the Au metallogenesis in this area. And the most intensive Au metallogenesis is in the first one and its neighbourhood. This innate connection is a macroscopical expression of the time bound of Au metallogenesis in this area.