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首页> 外文会议>12th international nickel symposium >Sulfur isotope studies of Ni-Cu-(PGE) mineralization associated with the Tamarack mafic-ultramafic intrusion,Minnesota
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Sulfur isotope studies of Ni-Cu-(PGE) mineralization associated with the Tamarack mafic-ultramafic intrusion,Minnesota

机译：明尼苏达州Tamarack镁铁质-超镁铁质侵入体与Ni-Cu-（PGE）矿化的硫同位素研究

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摘要

The Tamarack intrusion (1105.6 ± 1.2 Ma) in NE Minnesota,related to the Midcontinent Rift System,occurs within the Paleoproterozoic Animikie Basin hosting potentially economic Ni-Cu-(PGE) mineralization.Olivine forsterite contents in main intrusive units range from Fo89 to Fo77 in coarse-grained lherzolite and from Fo85 to Fo79 in fine-grained olivine gabbronorite.The two coarse-grained lherzolite units have δ34S values ranging from 1.2-1.5‰ and 1.8-2.8‰;fine-grained olivine gabbronorite from 0.4-2.2‰;ores from 0.8-1.8‰;and country rocks from 2.0-6.0‰.Preliminary δ33S values range from 0.83-3.7 ‰ with Δ33S between 0.41-0.54‰.Ratios of 187Os/188Os range from 0.208 ± 0.001 to 1.603 ± 0.006 with an average of 17 ± 4.1 for γOs.Relatively low degrees of crustal contamination are inferred from the δ34S values and Os isotope mixing model implying the addition of only 0.8 to 1.45％ of a bulk contaminant.Within these constraints the addition of crustal S could not exceed 50％.However,Δ33S values of the semi-massive ores suggest an Archean sulfur component.A Nd/Th and La/Sm mixing model between estimated Tamarack parental melt and an average Archean continental crust predicts 5-10％ crustal contamination.Addition of both Archean and Proterozoic crustal sulfur was the principal cause of sulfide saturation at Tamarack involving emplacement of multiple batches of magma via various pathways.
机译：与中大陆裂谷系统有关的明尼苏达州东北部的塔玛拉克侵入岩（1105.6±1.2 Ma）发生在古元古代Animikie盆地内，该盆地蕴藏着潜在的经济镍铜（PGE）矿化作用。主要侵入单元中的橄榄镁橄榄石含量范围从Fo89到Fo77粗粒绿橄榄石和细粒橄榄石辉长岩中的Fo85至Fo79。两个粗粒橄榄石辉石的δ34S值分别在1.2-1.5‰和1.8-2.8‰之间；细粒橄榄石辉长石为0.4-2.2‰。矿石为0.8-1.8‰;岩石为2.0-6.0‰。初步δ33S值为0.83-3.7‰，Δ33S为0.41-0.54‰。187Os / 188Os的比率为0.208±0.001至1.603±0.006，平均γOs为17±4.1。从δ34S值和Os同位素混合模型推断出地壳的污染程度相对较低，这意味着仅添加了0.8％至1.45％的大块污染物。在这些约束下，地壳S的添加不能超过50 ％。但是，Δ33S值估计的Tamarack母体熔体与平均Archean地壳之间的Nd / Th和La / Sm混合模型预测地壳污染为5-10％。塔玛拉克（Tamarack）硫化物饱和的主要原因涉及通过各种途径放置多批岩浆。

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  • 会议地点 Guiyang(CN)
  • 作者

    V.Taranovic; E.M.Ripley; C.Li; D.Rossell;

  • 作者单位

    Department of Geological Sciences,Indiana University,Bloomington,IN 47405;

    Department of Geological Sciences,Indiana University,Bloomington,IN 47405;

    Department of Geological Sciences,Indiana University,Bloomington,IN 47405;

    Rio Tinto Exploration(Kennecott Exploration),Salt Lake City,UT 84116;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 P578.24;
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