宁芜盆地凹山和东山铁矿床流体包裹体和氢氧同位素研究
Fluid inclusions and H-O isotopic compositions in the Washan and Dongshan iron deposits, Ningwu basin, China.
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摘要: 本文对宁芜地区凹山和东山铁矿床中的磷灰石流体包裹体进行了较为系统的测温研究,并测定了不同时期形成的磁铁矿、阳起石和石英的H、O同位素组成。凹山和东山铁矿磷灰石含有丰富的流体包裹体,原生气液包裹体包括早期细长管状、针状包裹体(类型Ⅱ)和晚期不规则状包裹体(类型Ⅰ);早期包裹体又可分为单一液相包裹体(类型Ⅱ-a)、气液两相(富气相)包裹体(类型Ⅱ-b)、气液两相(富液相)包裹体(类型Ⅱ-c)和气相、液相及固相多相包裹体(类型Ⅱ-d)四种亚类。包裹体中至少含有五种不同的子矿物。磷灰石包裹体记录了多个峰值温度,从600℃~800℃到~410℃和-270℃,分别对应于磷灰石(磁铁矿+透辉石)、阳起石和石英的形成。流体的盐度随温度的降低而逐渐减小,从高达~80%NaCl equiv。到〈20%NaCl equiv.。磷灰石形成时流体处于不均匀的状态,流体包裹体为非均一捕获。H、O同位素研究显示成矿流体早期为演化的初始岩浆(水),在高温下形成了铁矿石;此后,成矿流体有可能与蒸发盆地卤水或大气降水发生混合;晚期则可能有较显著的大气降水加入。
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Key words:
- Washan Fe deposit /
- Dongshan Fe deposit /
- Fluid inclusion
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