Incorporation of As, Sb and Tl in pyrite from the epithermal Kandilka prospect, Eastern Rhodopes, south Bulgaria

Yana Georgieva, R. Vassileva, Sylvina Georgieva
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Abstract

The major and trace-element chemistry of two pyrite generations (Py1 and Py2) from the Kandilka epithermal prospect was studied by EDS-scanning electron microscopy and laser ablation ICP-MS techniques. Both generations of pyrite are distinguished by occurrence and chemical properties. Pyrite from the first generation (Py1) is established as trace-element poor, sub- to euhedral (mainly single) crystals up to 200 µm. The later As-bearing pyrite (Py2) forms fine-grained semi-massive aggregates with increased contents of trace-elements. Except for arsenic, Py2 is enriched in gold and antimony. The As content of Py2 increases in an oscillatory manner from core to rim, reflecting changes in As activity and the chemical evolution of ore-bearing fluids. The oscillatory-zoned pyrite is composed of complex rhythmic overgrowths of alternating As-rich and As-poor bands. Positive correlation between As- and Au-content in Py2 is characteristic. According to the current results, the Kandilka prospect could be concerned as a low-sulphidation deposit.
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保加利亚南部东罗多佩山脉 Kandilka 矿区表生黄铁矿中 As、Sb 和 Tl 的掺入情况
利用 EDS 扫描电子显微镜和激光烧蚀 ICP-MS 技术研究了坎迪尔卡热液矿区两代黄铁矿(Py1 和 Py2)的主要元素和痕量元素化学性质。这两代黄铁矿在出现和化学性质上都有区别。第一代黄铁矿(Py1)是一种微量元素贫乏的亚到八面体(主要是单晶体)晶体,大小可达 200 微米。后来的含砷黄铁矿(Py2)形成了细粒半块状集合体,微量元素含量增加。除砷外,Py2 还富含金和锑。从岩心到岩缘,Py2 的砷含量呈振荡上升趋势,反映了砷活性的变化和含矿流体的化学演化。振荡带状黄铁矿由富砷带和贫砷带交替的复杂节律过度生长组成。Py2中As和Au含量之间的正相关是其特征。根据目前的研究结果,坎迪尔卡探矿区可视为低硫化矿床。
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