论蓬家夼金矿基础地质──答杨金中等商榷之疑

GENERAL GEOLOGY OF THE PENGJIAKUANG GOLD DEPOSIT —A REPLY TO YANG JINZHONG'S QUESTION

蓬家夼金矿容矿地层为下白垩统莱阳群一段含碳碎屑岩系 ,与世界上已知的产于含炭岩系金矿床对比 ,以容矿地层时代新、陆相沉积及未经变质区别于已知的金矿床而认为是一种新类型金矿。笔者依据蓬家夼金矿控矿条件 ,成功预测并找到新的盲金矿床 (宋家沟 -发云夼金矿 )。本文论证蓬家夼金矿基础地质 ,指出杨金中等《论蓬家夼金矿的地质特征及成因与聂爱国等商榷》一文基础地质中的错误 :将莱阳群一段含碳碎屑岩错认为荆山群变质杂岩 ,将沉积碎屑岩误认为滑脱构造岩 。

The host strata of the Pengjiakuang gold deposit are carbonaceous clastic rocks of the first member of the Laiyang Group of the Lower Cretaceous Series. Compared with known gold deposits contained in carbonaceous clastic rocks in the world, the Pengjiakuang gold deposit is different from the known gold deposits for its young host rocks, continental deposition and no metamorphism. It belongs to a new type of gold deposits. The authors have successfully found new blind gold deposits (Songjiagou-Fayunkuang gold deposits), based on the ore-controlling conditions of the Pengjiakunag gold deposit. This paper deals with the general geology of the Pengjiakuang gold deposit, and points out a mistake in Yang Jinzhong's paper (On the geological features and genesis of Pengjiakuang gold depositDiscussion with Nie Aiguo et al.). In the paper, carbonaceous clastic rocks of the first member of the Laiyang Group are wrongly considered to be the metamorphic complex of the Jingshan Group, sedimentary clastic rocks are wrongly thought to be decollment tectonite,thus leading to a wrong conclusion on the genesis of the Pengjiakuang gold deposit.;