黔东南新元古界青白口系下江群火山碎屑浊流沉积与金矿关系的初步研究

Preliminary study on relationship between volcaniclastic turbidites and gold deposits of the Xiajiang Group of Neoproterozoic Qingbaikouan in southeastern Guizhou Province

贵州省东南部和湖南省西部接壤的大片新元古代下江群分布地区盛产的石英脉型金矿具有较大远景。该套巨厚的砂质板岩、沉凝灰质板岩常被称为复理石组合。通过对锦屏县平秋剖面、锦屏—远口地区天柱剖面以及锦屏、铜鼓等地的考察研究,认为它们均属于火山碎屑浊流沉积。本次主要研究锦屏、天柱一带浊积岩的沉积特征、岩石学特征和金的地球化学背景值,并参考了大量区域地质资料,分析了黔东南地区青白口纪番召期、清水江期、平略期和隆里期浊流沉积的古地理特征,指出石英脉金矿的分布受背斜轴的剪切带控制,而含沉凝灰岩的浊积岩还可能是其矿源层。

The gold-bearing quartz vein developed in the Xiajiang Group of Neoproterozoic in southeastern Guizhou Province and western Hunan Province has a great potential. The Xiajiang Group with an abundant gold-bearing quartz vein is named as a set of flysch assemblage containing thicklybedded sandy-slate, volcanic taffaceous slate, and a few marble, and belongs to a turbidite deposition, In the paper, the authors mainly study the sedimentary characteristics, lithologic characteristics and gecchemical background value of gold of the turbidites in Tianzhu and Jinping counties, Guizhou Province, On the basis of the palaeogeographic pattern of the Neoproterozoic Qingbaikouan （1000 Ma 850 Ma） in South China. the palaeogeographic evolution and geochemical background of gold -bearing in the stratigraphical units of the Neoproterozoic in southeastern Guizhou Province are analyzed, and the results show that the ore-bearing quartz vein is not only controlled by the shearing zones along the anticline axis, but also the turbidite units may contain volcanic taffaceous slate.