金山金矿K-Ar年龄及其对赣东北构造演化的指示意义

K-Ar age of illite in Jinshan gold deposit and its implication to the tectonic evolution of northeastern Jiangxi Province

金山金矿位于我国著名的德兴铜金矿集区内 ,是一个与韧性剪切带有关的金矿床。成矿流体作用过程中的水 -岩反应产物伊利石K -Ar年龄的测试结果表明 ,金山金矿地区存在着明显的晚古生代构造热事件 ,金山金矿的成矿作用与这次热事件活动有关 ,成矿年龄为 2 69.9～317.9Ma ;燕山期岩浆活动对金山金矿的影响不太明显。结合前人的研究成果 ,认为赣东北地区甚至整个华南地区在海西期不仅有明显的岩浆活动 。

The Jinshan gold deposit hosted in the ductile shear zone is located in the well_known Dexing copper_gold concentration district, northeast Jiangxi Province. K-Ar ages of illite formed during fluid-rock interaction indicate that there existed an obvious Late Paleozoic tectonic hot event in Jinshan district. Baesd on the geological setting, the paper holds that the ore_forming process of the Jinshan gold deposit was related to this tectonic hot event. The ore_forming age of the Jinshan gold deposit is between 269.9 Ma and 317.9 Ma. The paper suggests that there is no direct evidence for the influence of Yanshanian magmatic activity on Jinshan mineralization. It is concluded that there is an obvious Herenian magmatic activity in Northeast Jiangxi or even in whole South China, which seems to be an important gold deposit_forming period.