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首页> 外文学位 >The hydrology of carbonate-hosted Pb-Zn-Cu ore formation in Southeast Missouri: Numerical models for reactive fluid flow and heat transfer during the Ouachita orogeny.
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The hydrology of carbonate-hosted Pb-Zn-Cu ore formation in Southeast Missouri: Numerical models for reactive fluid flow and heat transfer during the Ouachita orogeny.

机译：密苏里州东南部碳酸盐岩含铅Pb-Zn-Cu矿石形成的水文学：瓦希塔造山运动中反应性流体流动和传热的数值模型。

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摘要

A growing body of evidence indicates a relationship in the genesis of the Pb-Zn-Cu ores of the Southeast Missouri district to Late Paleozoic tectonism along the Appalachian-Ouachita orogenic belt. The present study investigates the role that deep, sedimentary brines in the Ozark region, mobilized by the creation of steep topographic gradients during Ouachita orogenesis, played in the formation of the ores. The paleohydrology of this flow system was reconstructed and geochemical ore depositional mechanisms within this context were explored.;Transient finite element calculations of fluid flow, heat transport, and solute transport led to quantitative characterization of the evolution of the fluid velocity, temperature, and salinity fields as a result of uplift and erosion of Ozark topography. Predicted temperatures for the Southeast Missouri district did not match apparent ore-forming temperatures unless heat flow in the region was assumed to be considerably higher that it is at present. Results of the hydrologic calculations showed further that the onset of fluid velocities and temperatures optimal for forming the ores coincided very closely with the onset of low salinities, generated by meteoric recharge, unsuitable for forming the ores. Unless salinity was somehow replenished, then a relatively short period of time (10;Reactive transport calculations showed that the predicted thermal structure of the Ozark flow system was naturally conducive to the localization of ores in Southeast Missouri by cooling. However, the results also affirmed traditional criticisms of the cooling model, namely that the rate of ore deposition would be too slow given the amount of time available, and the ratio of quartz to metal sulfide mineral precipitation would be too high. Simulations of the mixing of separately transported metals and reduced sulfur showed that this mechanism would also lead to the concentration of ores in Southeast Missouri, due to local hydrogeologic controls. However, the simulations also showed mixing of fluids in the hydrologic environment of the Southeast Missouri district to be less efficient an ore-forming mechanism than has often been supposed, based on geochemical grounds alone.
机译：越来越多的证据表明，密苏里州东南部地区铅锌锌铜矿的成因与阿巴拉契亚-沃希塔造山带上的晚古生代构造有关。本研究调查了在Ouachita造山过程中由陡峭的地形梯度产生而动员的Ozark地区深层沉积盐水在矿石形成中的作用。重建了该流系统的古水文学，并在此背景下探索了地球化学矿床的沉积机理。流体流动，传热和溶质运移的瞬态有限元计算导致了流体速度，温度和盐度演变的定量表征Ozark地形的隆起和侵蚀所致。密苏里州东南部地区的预测温度与表观成矿温度不符，除非假定该地区的热流量比目前高得多。水文计算的结果进一步表明，形成矿石的最佳流体速度和温度的开始与不适合形成矿石的，由陨石补给产生的低盐度的开始非常吻合。除非通过某种方式补充盐分，否则在相对较短的时间内（10；反应输运计算表明，预测的奥扎克流动系统的热结构自然有利于通过冷却使密苏里州东南部的矿石局部化，但是结果也得到了肯定。传统上对冷却模型的批评是，如果有足够的时间，矿石的沉积速度将太慢，而石英与金属硫化物的矿物沉淀的比率将太高。硫表明，由于局部水文地质控制，这种机理也将导致密苏里州东南部的矿石集中，但模拟结果还表明，密苏里州东南部地区水文环境中的流体混合效率较低。仅凭地球化学依据，比通常想象的要大。

著录项

  • 作者

    Appold, Martin Stephan.;

  • 作者单位

    The Johns Hopkins University.;

  • 授予单位 The Johns Hopkins University.;
  • 学科 Hydrologic sciences.;Geology.;Geochemistry.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 236 p.
  • 总页数 236
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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