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首页> 外文学位 >Petrographie, geochimie et potentiel economique en fer-titane-phosphore du secteur du Lac a Paul, partie nord de la suite anorthositique de Lac-Saint-Jean, province de Grenville, Quebec.
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Petrographie, geochimie et potentiel economique en fer-titane-phosphore du secteur du Lac a Paul, partie nord de la suite anorthositique de Lac-Saint-Jean, province de Grenville, Quebec.

机译：魁北克省格伦维尔省Lac-Saint-Jean的正畸套件北部的Lac-Paul区段的铁钛-磷的岩石学，地球化学和经济潜力。

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摘要

This master's project is a study of the geochemistry, the petrography and economic potential of iron-, titanium-, and phosphorus-rich rocks (Fe-Ti+/-P) of the lac a Paul area, located in the northern part and on the margins of the Lac Saint-Jean anorthositic suite (LSJAS). The LSJAS is part of the Grenville province, which is characterized by numerous proterozoic AMCG-type anorthositic suites. This type of Fe-Ti+/-P enrichment is characteristic of these suites.;The minerals analysed by microprobe (olivine, plagioclase, orthopyroxene, clinopyroxene, ilmenite, magnetite, spinel and apatite) all display evolved compositions. The plagioclase is mostly andesine (An27 to An 50) and the forsterite content of the olivines varies from Fo46 to Fo63. Unlike the other lithologie, which are characterized by ilmenite, the ferrodiorites contain hemo-ilmenite.;The evolved nature of the different rock types of the lac a Paul area, illustrated by the petrographic and geochemical studies, indicates that the parental magma of these rocks is also evolved. Moreover, the ubiquitous distribution of apatite indicates that the parental magma had a composition where apatite was on the liquidus. The REE composition of the parental magma was calculated using the REE composition of separated apatites analyzed by INAA. This (calculated) composition is similar to the composition of ferrodioritic rocks often associated with anorthosite massifs. The formation of the anorthositic and troctolitic rocks is possible by crystal fractionation, from a magma of ferrodioritic composition. The origin of the nelsonitic peridotites remains problematic and liquid immiscibility cannot be excluded. The Fe-Ti oxide rocks were probably formed by migration of the ilmenite and magnetite in low-pressure zones during emplacement of the rocks of the study area or during subsequent deformation. The ferrodiorites have higher LREE enrichment than the calculated magmatic compositions of the lac a Paul area but they are probably genetically related to the Fe-Ti+/-P-rich rocks of the study area.;The nelsonitic peridotites, with 10 to 25% apatite, have the highest economic potential in terms of phosphorus (4 to 10% P2O5). They have a widespread distribution in the study area and they could also represent a secondary economic potential in ilmenite and magnetite. The Fe-Ti oxide rocks display the highest concentrations in iron and titanium. Unfortunately, they have an erratic distribution in the study area.;The Fe-Ti+/-P enrichment of the different types of rocks in the lac a Paul area reflects their variable enrichment in magnetite, ilmenite and apatite. The sampled rocks that show this type of Fe-Ti+/-P enrichment were divided into six lithologies: (1) Fe-Ti oxides- and apatite-bearing anorthosites, leucogabbros, leuconorites and leucogabbronorites; (2) Fe-Ti oxides- and apatite-bearing troctolites and leucotroctolites +/-; (3) nelsonitic peridotites; (4) Fe-Ti oxides rocks; (5) Fe-Ti oxides-bearing pyroxenites, and; (6) Fe-Ti oxides-bearing dunites. Some ferrodiorites, in the form of crosscutting dykes, were also sampled.
机译：该硕士项目是研究位于北部和北部的保罗地区的富含铁，钛和磷的岩石的地球化学，岩石学和经济潜力（Fe-Ti +/- P）。 Lac Saint-Jean矫正套件（LSJAS）的边缘。 LSJAS是格林维尔（Grenville）省的一部分，该省的特征是众多元古代的AMCG型无脊椎动物。这些类型的Fe-Ti +/- P富集是这些套件的特征。通过微探针分析的矿物质（橄榄石，斜长石，邻辉石，斜辉石，钛铁矿，磁铁矿，尖晶石和磷灰石）均显示出演化的成分。斜长石大多是安山药（An27至An 50），橄榄石的镁橄榄石含量从Fo46到Fo63不等。与其他以钛铁矿为特征的岩性不同，铁二闪石含有血钛铁矿。岩石学和地球化学研究表明，紫胶保罗地区不同岩石类型的演化性质表明这些岩石的母岩浆也在发展。此外，磷灰石无处不在的分布表明，母体岩浆具有在液相线上磷灰石的组成。母岩浆的REE组成是使用INAA分析的分离出的磷灰石的REE组成来计算的。这种（计算出的）成分类似于经常与钙铁矿块相关的铁铁异岩的成分。通过铁二异质组成岩浆的晶体分级分离，可以形成无定形和四面体岩石。核橄榄岩橄榄岩的起源仍然存在问题，不能排除液体的不溶混性。 Fe-Ti氧化物岩石可能是由于在研究区域的岩石安放过程中或随后的变形过程中钛铁矿和磁铁矿在低压区的迁移而形成的。铁硅铁矿的LREE富集度比lac a Paul地区的岩浆成分高，但可能与研究区富铁-Ti +/- P的岩石具有遗传相关性;橄榄岩橄榄岩，磷灰石含量为10％至25％在磷方面（P2O5为4至10％）具有最高的经济潜力。它们在研究区域中分布广泛，也可能代表钛铁矿和磁铁矿的次要经济潜力。 Fe-Ti氧化物岩石中的铁和钛含量最高。不幸的是，它们在研究区域中分布不规则。；保罗地区中不同类型岩石的Fe-Ti +/- P富集反映了它们在磁铁矿，钛铁矿和磷灰石中的富集程度不同。表现出这种Fe-Ti +/- P富集的采样岩石被分为六种岩性：（1）含Fe-Ti氧化物和磷灰石的钙长石，leucogabbros，leuconorite和leucogabbronorite； （2）含铁钛氧化物和磷灰石的闪锌矿和白云母+/-； （3）核橄榄岩； （4）铁钛氧化物岩； （5）带有Fe-Ti氧化物的辉石，以及； （6）含Fe-Ti氧化物的dunits。还取样了一些横贯堤坝形式的铁铁素体。

著录项

  • 作者

    Fredette, Julie.;

  • 作者单位

    Universite du Quebec a Chicoutimi (Canada).;

  • 授予单位 Universite du Quebec a Chicoutimi (Canada).;
  • 学科 Geology.
  • 学位 M.Sc.A.
  • 年度 2006
  • 页码 304 p.
  • 总页数 304
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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