大兴安岭北段大梁金矿地质特征及其成因初探

Geological characteristics and genetic study of Daliang gold deposit on the Northern Section of Da Hinggan Ling

大梁金矿矿体产于元古宇加疙瘩群中,与条带状黄铁矿、磁黄铁矿硅质白云岩密切相关。尽管矿区地表极难见到露头,但通过对地表探槽、坑道及地表偶见碎石的仔细观察,对钻孔资料的总结分析,发现矿区地层产状变化很大。据此,结合岩石学及构造特征,认为矿区存在同生断层的可能性很大。种种证据表明,矿床成因属海底喷气沉积成因,变质作用对其改造不强烈。这种类型的金矿床在大兴安岭是第一次发现。文章依据已有钻孔资料、矿床成因,对矿床的进一步勘查提出了建议。

The orebodies are located in Jiageda Group of Proterozoic, closely related with banded siliceous dolomite bearing pyrite and pyrrhotite. Although it is very difficult to find rock outcrops, we discover that strta in the ore district vary intensely throngh carefully observation to prospecting trentches, gallery and exposures. According to this, along with petrological and structural charac- teristics, we think this deposit is of exhalative genesis with slight metamorghic reformation, and there most likely exists a syngenetic fault . This type of deposit is found the first time in Da Hinggan Ling. According to its drilling data and genesis, we put forward our suggestions about its further prospecting.