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首页> 外文学位 >The geochemistry of gold, arsenic, and antimony in the Carlin-type gold deposits and the mechanics of geologic fractures.
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The geochemistry of gold, arsenic, and antimony in the Carlin-type gold deposits and the mechanics of geologic fractures.

机译：卡林型金矿床中金，砷和锑的地球化学特征以及地质裂缝的力学特征。

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摘要

Because geologic fractures often control the location and grade of an orebody, the ability to understand their occurrence and mineralogy is a significant step in assessing the economic viability of a deposit. In Part I of this dissertation, the geochemistry of gold, arsenic, and antimony in the fractured, Carlin-type gold deposits of Nevada is investigated. In Part II, a tribute to the late Dr. Neville G. W. Cook is paid with three independent geomechanics studies designed to understand the conditions leading to fracture, as well as develop methods to detect their presence.; Part I of this dissertation begins with a review of the geology and geochemistry of the Carlin-type gold deposits necessary to constrain the geochemical model developed in the study (Chapter 1). Following this introduction, the HKF equation of state is shown to inadequately describe the derivative thermodynamic properties of neutral aqueous species (Chapter 2). Despite these reservations, the HKF equation of state parameters for aqueous gold, arsenic, and antimony species are calculated in Chapter 3. Given the available geologic data for the Carlin-type gold deposits, antimony and arsenic solubility in the system are found to be controlled by their hydroxide species, and gold by its sulfide complexes (Chapter 4). These results imply that sulfidation of host rock iron is a process which could selectively precipitate gold, pyrite, and arsenian pyrite; however, phase and solubility diagrams also suggest that the oxidation state of the system is a key variable, and additional research is required.; After a brief prologue to Part II (Chapter 5), far field compressive stresses are shown to be responsible for jointing at a field site on Vancouver Island, British Columbia (Chapter 6). Despite the prevalence given to "tensile" mechanisms in the geologic literature, these are found to be secondary effects. In the next geomechanics study (Chapter 7), a method to predict the occurrence of fractures in rock using seismic amplitude measurements at various orientations to bedding is investigated. Finally, in Chapter 8, a new, nondilatational fracturing mechanism which likely contributes to sand production in oil and natural gas reservoirs is identified.
机译：由于地质裂缝通常控制着矿体的位置和品位，因此了解其发生和矿物学的能力是评估矿床经济可行性的重要一步。在本文的第一部分，研究了内华达州卡林型金矿中金，砷和锑的地球化学特征。在第二部分中，向已故的内维尔·库克（Neville G. W. Cook）博士致敬，进行了三项独立的地质力学研究，旨在了解导致破裂的条件，并开发检测其存在的方法。本论文的第一部分首先回顾了约束研究中开发的地球化学模型所必需的卡林型金矿床的地质和地球化学（第一章）。介绍之后，HKF状态方程显示不足以描述中性水性物质的导数热力学性质（第2章）。尽管有这些保留，在第3章中将计算水性金，砷和锑物种的HKF状态参数方程。给定Carlin型金矿床的可用地质数据，可以发现系统中的锑和砷溶解度受到控制。它们的氢氧化物种类，以及金的硫化物络合物（第4章）。这些结果表明，主体岩铁的硫化是可以选择性地析出金，黄铁矿和砷黄铁矿的过程。但是，相图和溶解度图也表明系统的氧化状态是关键变量，需要进一步的研究。在简短介绍了第二部分（第5章）后，表明远场压缩应力是造成不列颠哥伦比亚省温哥华岛的一个野外作业的原因（第6章）。尽管在地质文献中普遍使用“拉伸”机制，但发现它们是次要作用。在下一个地质力学研究（第7章）中，研究了一种使用在各个层理方向上的地震振幅测量来预测岩石破裂的方法。最后，在第8章中，确定了一种新的，不膨胀的压裂机制，该机制可能有助于油气藏的出砂。

著录项

  • 作者

    Bessinger, Brad Alan.;

  • 作者单位

    University of California, Berkeley.;

  • 授予单位 University of California, Berkeley.;
  • 学科 Geochemistry.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 326 p.
  • 总页数 326
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
  • 关键词

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