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与偏碱性岩有关的金矿是我国金矿床的一种新类型。本文从区域地质、矿床地质、稳定同位素、矿物流体包裹体、微量元素、稀土元素地球化学角度出发,研究了河北省西北部的该类型金矿的地质特征,探讨了这一新类型金矿床的控矿因素及形成机制,并把研究区内与偏碱性岩有关的金矿床分为“东坪式”及“后沟式”两种。研究结果证实,该类型金矿属于与偏碱性岩有成因联系的岩浆热液型金矿床。
Gold ore associated with alkaline rocks is a new type of gold deposits in China. This paper studies the geologic characteristics of this type of gold deposit in the northwestern part of Hebei Province from the aspects of regional geology, mineral deposits, stable isotopes, mineral fluid inclusions, trace elements and rare earth elements geochemistry, and discusses the characteristics of this new type gold deposit The ore-controlling factors and the formation mechanism, and divides the gold deposits related to the over-alkaline rocks in the study area into two types: “Dongping type” and “Hougou type”. The results of the study confirm that this type of gold deposit belongs to the magmatic hydrothermal gold deposit that is genetically associated with the alkaline-alkaline rocks.