古碧口洋盆岛弧成矿系列划分

Division of Island arc Metallogenic Series in Gubikou Ocean Basin

碧口火山岩系中产出铁、铜、铅、锌、金、银、硫铁矿等系列矿床。在"成矿系列"理论的指导下,通过新一轮地勘基金项目新发现BIF型金矿、碧玉矿、汉白玉矿等新型资源和一大批新矿床(点),丰富了碧口火山岩系矿产资源内涵。这些矿床多是与原始火山作用有成生联系的岩浆热液、火山热液、火山沉积矿产经后期变质改造叠加而成。笔者在原区域成矿系列划分的基础上,结合新发现和新认识,以碧口岩群为单元重新进行了成矿系列的划分。研究认为碧口-阳坝-黑木林为古碧口洋盆岛弧位置;岛弧火山大致经历了3个大旋回,由此形成岛弧岩浆岩和岛弧火山岩2个成矿系列,5个成矿亚系列,对碧口地区找矿具有一定的指导作用。

in Bikou volcanic rock series,a series of deposits such as iron,copper,lead,zinc,gold,silver and pyrite are produced.Under the theory of“metallogenic series”,new resources as BIF type gold,jasper,and white marble,and also a large number of new deposits(spots),have been discovered in the new round of geological exploration fund project,further enriching the connotation of Bikou volcanic rock series.Most of these deposits are are superimposed by magmatic hydrothermal,volcanic hydrothermal and volcanic sedimentary minerals related to the original volcano in the later metamorphism and transformation.Based on the original division of regional metallogenic series,the redivision of metallogenic series is carried out taking Bikou Group as the unit.This research considers that Bikou-Yangba-heimulin is in the position of the island arc in ancient Bikou ocean basin.The island arc volcano has roughly experienced three major cycles,thus forming two metallogenic series and five metallogenic subseries.The result has a certain guiding role in mineral exploration in Bikou area.