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首页> 外文会议>PACRIM Congress >O and C Isotope Study of Bastnas-type Rare Earth Element Mineralisation, Bergslagen, Sweden
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O and C Isotope Study of Bastnas-type Rare Earth Element Mineralisation, Bergslagen, Sweden

机译：o和c同位素研究Bastnas型稀土元素矿化，瑞典Bergslagen

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The Bastnas-type magnetite-skarn-hosted rare earth element (REE) mineralisations are located in the Palaeoproterozoic Bergslagen ore province, central Sweden, and occur along a ca 100 km long belt of 1.90-1.87 Ga metavolcanosedimentary rocks. Ten different Bastnas-type deposits have been sampled in order to assess the origin of ore-forming fluids in these systems. Magnetite and quartz have delta~(18)O values ranging from -2.3 to +1.1‰and +7.2 to +8.3‰ respectively. Mineralised carbonates have delta~(18)O values between +5.8 and +7.2%o and delta~(13)C values between -5.4 and -3.3%o. Temperature calculations based on the O-isotope composition of mineral pairs, combined with available fluid inclusion data, suggest primary mineralisation at ca 650-400°C. For these temperatures, calculated equilibrium fluids have delta~(18)O values that range from those typical of magmatic fluids (+6 to +8‰) to lower values (down to +3‰). Variation in carbonate O and C isotope data are consistent with interaction between local Palaeoproterozoic carbonate rocks (delta~(18)O = +12.5 to +19.6‰ and delta~(13)C = -1.8 to +1.7‰) and fluids of a magmatic origin. It is suggested that the Bastnas-type REE-magnetite mineralisations formed as a result of reactions between local carbonate units and high-temperature, magmatic-dominated hydrothermal fluids during 1.90-1.87 Ga (Svecofennian) syn-volcanic activity.
机译：Bastnas型磁铁矿 - 斯塔尔托管稀土元素（REE）矿物质矿物群落位于瑞典中部古古典古代博格勒省，并沿着CA 100公里的长带，长达1.90-1.87 GA MetavolcanateAlical岩石。已经采样了十种不同的巴斯特纳型沉积物，以评估这些系统中的成矿液的起源。磁铁矿和Quartz分别具有-2.3至+ 1.1÷和+7.2至+ 8.3‰的Δ〜（18）o值。矿化碳酸酯具有δ〜（18）o值+ 5.8和+ 7.2％o和delta〜（13）c值之间的-5.4和-3.3％o。基于矿物对O-同位素组成的温度计算，与可用的流体包裹数据组合，提示Ca 650-400°C的主要矿化。对于这些温度，计算的平衡流体具有Δγ〜（18）o值，其范围从岩浆液（+6至+ 8°）的典型值下降到较低的值（下降至+ 3‰）。碳酸酯O和C同位素数据的变化与当地古典古代碳酸盐之间的相互作用一致（Delta〜（18）o = +12.5至+ 19.6℃和δ〜（13）c = -1.8至+ 1.7‰）和流体岩浆起源。建议在1.90-1.87（Svecennennian）同步活性期间，在局部碳酸酯单元和高温下，岩浆主导的水热流体之间的反应形成Bastnas型REE-磁铁矿成矿。

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