河南银洞坡金矿黄铁矿微量元素特征及对矿床成因的指示意义

Characteristics of Trace Elements in Pyrite and Their Implications for the Genesis of Yindongpo Gold Deposit in Henan Province

摘要: 以银洞坡金矿床中黄铁矿为研究对象, 利用激光剥蚀电感耦合等离子体质谱仪(LA-ICP-MS)对黄铁矿微量元素开展原位微区分析, 探讨其矿床成因。根据野外和室内观察结果, 银洞坡金矿中黄铁矿主要划分为3个世代。黄铁矿微量元素表明, Py1为沉积成因黄铁矿, 与金形成无关; Py2、Py3具岩浆热液成因黄铁矿特征, 为成矿期黄铁矿。结合区域矿床地质, 银洞坡金矿为岩浆热液型矿床。

Abstract: The laser ablation inductively coupled plasma mass spectrometry is adopted to analyse the trace elements of pyrite and investigate the genesis of the Yindongpo deposit. Base on the field and microscopic observation, the pyrites in the Yindongpo deposit could be divided into three generations. The trace elements of pyrites indicate that Py1 is sedimentary origin, unrelated to gold mineralization; Py2 and Py3 are the dominated pyrite types, which is of magmatic source. Combined with the regional geology, the Yindongpo deposit belongs to magmatic hydrothermal deposit.