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We report on an objective methodology, referred to as intrinsic sample methodology, for the delineation of exploration target areas or resource areas for assessment. Important features of the methodology include (1) identification of recognition criteria for critical genetic factors, (2) synthesis of new variables from enhanced geodata, (3) estimation of logit probability models, and (4) cutting of estimated logit probabilities to delineate exploration targets or resource areas. The methodology is demonstrated on the Walker Lake quadrangle of Nevada and California. 相似文献
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For the delineation of water-bearing fractures in hard rock areas, a new hydro-chemical technique has been developed which
is based on electrical conductivity (EC) logs. The EC logs were carried out in experimental shallow bore wells (≈50 m) in
three different parts of India. A sharp variation in EC was observed near water-bearing fractures in hard rock areas. To access
applications of this technique, different locations in India were selected and experimental bore wells (≈50 m) were drilled.
These were:
Observations on EC logs were made at short intervals of 1.0 m from the water table (narrow spacing wherever required) until
reaching the bottom of the wells. EC showed remarkable changes in value, which was attributed to the presence of water-bearing
fractures in the hard rock areas. The results of this study are in good agreement with geophysical and geological findings.
In addition to identifying the water-bearing fractures, the EC logs also provide various other hydrological and hydrochemical
information, i.e., water table, total depth of the bore well, total dissolved solids (TDS), behavior of water–rock interaction,
water quality, information about the chemistry of aquifers, etc. 相似文献
| (1) | Maheswaram (30 km South of Hyderabad): nine shallow bore wells in a watershed of 60 km2 in granitic aquifers, |
| (2) | Wailpally (60 km East of Hyderabad): four shallow bore wells in a watershed of 50 km2 in granitic terrain. |
| (3) | Sadras (60 km SSW of Chennai): four shallow bore wells in a watershed 12 km2 in a charnokite aquifers. |
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划分潜在震源区的地震地质规则研究 总被引：17，自引：0，他引：17
根据近年来发震构造地质条件研究的进展，本文探讨了划分潜在震源区主要的地震地质规则，具体包括潜在震源区的识别；。它的位置，长度，宽度和震级上限的确定等内容。规则的归纳充分考虑了活动构造性质的差异和资料完备程度的不同。 相似文献
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The uncertainty of potential seismic regions for moderately strong earthquakes has a great effect on the results of seismic hazard analysis in weak seismicity regions,so it is the basement of seismic zoning and seismic hazard assessment for engineering sites by correctly dividing the potential seismic regions for moderately strong earthquakes.By taking Northeast and North China as examples,the authors compiled and systematically analyzed a large amount of basic data and then suggest the principles and methods of potential seismic regions for moderately strong earthquakes based on a great number of case studies.The practical division of potential seismic regions in the Changchun and Jilin areas shows that these principles and methods show better suitability.Moreover,the authors also discuss in this paper the progress obtained and put forward some problems that should be solved in the future. 相似文献
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在固体矿产矿体圈定中,目前常用内插法的内插计算公式在推导过程中,没有考虑采用最低工业可采品位与最低工业可采米百分率圈定矿体边界的协调性,致使有时不合理地增加或减少部分工业储量。针对这一缺点,本文介绍一个更合理、使用更方便的计算边界点品位与厚度的修正公式。 相似文献
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我国东北和华北地区中强地震潜在震源区的划分原则和方法 总被引：18，自引：5，他引：18
中强地震潜在震源区的不确定性，对弱地震活动区地震危险性分析结果的影响较大。因此，正确二划分中强地震潜在震源区，是地震区划加和工程场地地震安全性评价的基础。本文以东北和华北地区为例，较为系统地整理了大量基础资料，从众多典型震例分析结果中提出了该地区中强地震潜在震源区的划分原则和方法，对长春，吉林等地区进行了实验划分结果表明，本文所提出了划分原则和方法具有较好的适应性。与此同时，还对本文取得的进展和有 相似文献
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