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Petrography, Petrochemistry and petrogenesis of Huronian volcanic rocks of the Elliot Lake region, Ontario

机译：安大略省艾略特湖地区的Huronian火山岩的岩相学，岩石化学和岩石成因

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摘要

In the Elliot lake region of northern Ontario, Yolcanlc lava pilesrepresent the lowermost units of the Huronian SUpergroup. These rocksgeneral1y trend east-west and belong to the Elliot lake Group. They ares1tuated on the north and south limbs or the QuIrke lake Syncline.The volcanIc rocks of this study contain a secondary mineraiassemblage consisting of actinolite, biotite, chlorIte, eptdote/cllnozoisltetttanomagnettte and calcite characteristic of greenschist metamorphism.Compilation of data suggests that metamorphism of the volcanic rocksproceeded between 325- and 425-C and between 2.4 and 4.7 kb.Geochemtcally these lavas represent tholeiitic and calc-alkalineassemblages. The tholeiites are character1sttcally enriched tn Fe and Ttand consist mainly of basalts, basaltic andesites and andesites. Theserocks are believed to have formed by the partIal melting of a peridotttesource at low P-T. In contrast, the calc-alkaline rocks are depleted in Feand TI, but show a signIficant enrichment In 51 and Zr; andesIte Is the majorrock type for thIs assemblage. I·t Is postUlated that the calc-alkalIne sU1teof rocks was the result of eIther the partIal meltIng of abasaltic·magma atshallow depth, or the melttng of s1al1c crustal materIal due to the addedwe1ght of tholeiitIc material on an unstable crust and to downwarplngprocesses Inttlated by convection cells.
机译：在安大略省北部的艾略特（Elliot）湖地区，Yolcanlc熔岩桩代表着休伦河超级群的最低单元。这些岩石一般呈东西向趋势，属于埃利奥特湖群。它们位于南，北肢或QuRrke湖向斜线上。本研究的火山岩包含次生矿物组合，包括阳起石，黑云母，绿泥石，拟deptote / llonzoisltetttanomagnettte以及绿片岩变质特征的方解石。在325-425-C和2.4-4.7 kb之间产生了火山岩。从地球化学上讲，这些熔岩代表高渗和钙碱性组合。菱铁矿的特征是富含铁和钛矿，主要由玄武岩，玄武质安山岩和安山岩组成。据认为，这些岩石是由于橄榄石源在低P-T下部分熔化而形成的。相比之下，Feand TI中的钙碱性岩石已枯竭，但在51和Zr中却显示出明显的富集作用。安第斯山脉是该组合的主要岩石类型。可以推测，钙盐岩的形成是由于玄武岩，岩浆在浅层深度发生了部分熔融，或者由于不稳定地壳上增加了可塑性材料的熔融和向下弯曲作用而使地壳物质熔融的结果。对流细胞。

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    Cumming Bradley R.;

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  • 年度 1985
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  • 原文格式 PDF
  • 正文语种 eng
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