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首页> 外文学位 >The effectiveness of lithogeochemistry versus X-ray diffraction-defined mineralogy in outlining areas of volcanogenic massive sulfide-related alteration: A comparative study within the paleoproterozoic Baker Patton felsic Complex, Flin Flon, Manitoba, Canada.
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The effectiveness of lithogeochemistry versus X-ray diffraction-defined mineralogy in outlining areas of volcanogenic massive sulfide-related alteration: A comparative study within the paleoproterozoic Baker Patton felsic Complex, Flin Flon, Manitoba, Canada.

机译：岩石地球化学与X射线衍射确定的矿物学在火山成因的大块硫化物相关蚀变概述区域中的有效性：加拿大马尼托巴省Flin Flon的古生代贝克·巴顿铁素体复合体的比较研究。

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摘要

The volcanogenic massive sulfide deposit-hosting, Paleoproterozoic Baker Patton Complex, at Flin Flon, Manitoba, is the focus of a comparative study designed to evaluate the effectiveness of lithogeochemical data versus X-ray diffraction-derived, semi-quantitative mineralogical data, in detecting, defining, and vectoring within discordant volcanogenic massive sulfide alteration zones. The study was conducted at two scales, the local, or deposit scale, and the regional, or reconnaissance scale, in order to compare the usefulness of each method in delineating alteration at scales relevant to exploration. Discordant alteration in the Baker Patton Complex is defined by up to 2 km2 alteration zones of sencite and quartz alteration, and feldspar destruction, within slightly broader zones of chlorite alteration. The discordant alteration zones are best detected by anomalously low abundances of Na2O, CaO, and feldspar, and anomalously high abundances of K2O, MgO, quartz, muscovite, and chlorite. Semiconformable alteration in the western Baker Patton Complex, characterized by silicification of rhyolite lobes and flow margins, epidotization of hyaloclastite in lobe-hyaloclastite rhyolite facies, and a more pervasive spilitization, is best targeted by anomalously high abundances of SiO2, CaO, Na2O, K2O, and feldspar, and by the presence of epidote. With few exceptions, both analytical methods target the same alteration zones in the western Baker Patton Complex. In addition to its usefulness as a volcanogenic massive sulfide deposit-exploration tool, semi-quantitative phase analysis may be used in exploration to provide unique information, not obtainable from lithogeochemical data: (1) it can be used to determine the modal mineralogy of fine-grained, altered volcanic rocks, the most common host of volcanogenic massive sulfide deposits, (2) it can detect changes in mineralogy when there are no changes in bulk lithogeochemistry, and (3) it can be used to model hydrothermal systems, whereby alteration minerals and their abundances provide insight into the physicochemical conditions that existed within the hydrothermal system. At this time, lithogeochemical analysis is still the more practical exploration tool, being more routine, less costly, and less time-consuming than semi-quantitative X-ray diffraction analysis. Further studies are required to assess the effectiveness of semi-quantitative phase analysis as an exploration tool at other scales of exploration, and within various other geological environments.*; *This dissertation is a compound document (contains both a paper copy and a CD as part of the dissertation). The CD requires the following system requirements: Microsoft Office; Adobe Acrobat.
机译：位于马尼托巴省Flin Flon的火山成因的大型硫化物矿床-古元古代Baker Patton矿床是一项比较研究的重点，该研究旨在评估岩性化学数据与X射线衍射，半定量矿物学数据在检测中的有效性，在不协调的火山成因的大块硫化物蚀变带内进行定义，引导。为了比较每种方法在描述与勘探有关的尺度上描述蚀变的有用性，研究在两个尺度上进行，即局部或矿床尺度，以及区域或侦察尺度。贝克·帕顿复合体中不一致的蚀变定义为在稍宽的亚氯酸盐蚀变区中，最多有2 km2的辉绿岩和石英蚀变蚀变带和长石破坏。 Na2O，CaO和长石的异常低丰度，以及K2O，MgO，石英，白云母和绿泥石的异常高丰度，可以最好地检测出不一致的蚀变带。西部贝克巴顿复合体的半整合蚀变特征是流纹岩裂片的硅化作用和流缘，硅质-破土质流纹岩相中的破硅质岩的岩化作用和更普遍的上斜作用，最理想的目标是异常高的SiO2，CaO，Na2O，Na2O，Na2O的丰度，长石，以及存在的附子。除少数例外，这两种分析方法均以西部贝克·巴顿综合体中相同的蚀变带为目标。半定量相分析除了可用作火山成因的块状硫化物矿藏勘探工具外，还可用于勘探，以提供独特的信息，这些信息无法从岩石地球化学数据中获得：（1）可用于确定精细矿物的模态矿物学-粒状，蚀变的火山岩，是火山爆发的块状硫化物沉积的最常见宿主；（2）当整体岩性化学没有变化时，它可以检测矿物学变化；（3）可用于对水热系统进行建模，从而改变矿物质及其丰富度提供了对热液系统内存在的物理化学条件的了解。此时，岩相化学分析仍是更实用的勘探工具，与半定量X射线衍射分析相比，它更具常规性，成本更低且耗时更少。需要进一步的研究，以评估半定量相分析作为其他勘探规模和各种地质环境中的勘探工具的有效性。*; *本论文是复合文件（作为论文的一部分，包含纸质副本和CD）。该CD需要满足以下系统要求： Adobe Acrobat。

著录项

  • 作者

    Mitchinson, Dianne Edith.;

  • 作者单位

    Laurentian University of Sudbury (Canada).;

  • 授予单位 Laurentian University of Sudbury (Canada).;
  • 学科 Geology.; Geochemistry.
  • 学位 M.Sc.
  • 年度 2004
  • 页码 143 p.
  • 总页数 143
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;地质学;
  • 关键词

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