湖北省随州市北部变质岩中石英的找矿矿物学
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Prospecting Mineralogy of Quartz in Metamorphic Rocks of Northern Suizhou City,Hubei Province
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    摘要:

    湖北省随州市北部的变质岩中,发育有不同期的矿化与非矿化石英脉。本文通过对 石英的电子顺磁共振谱、热发光曲线及中子活化分析结果的研究,系统探讨了不同时代及产状石 英的差异及共与金矿化之问的关系。指出石英晶格中出现Fe3+杂质、Al-O-心自旋浓度大于1.3x 1014spias/mg、有Au和Ag检出且K/Na值大于3,其所在蚀变带为含矿蚀变破碎带。

    Abstract:

    In northern Suizhou, Hubei Province, greenschist-amphibolite facies regi- oral metamorphic rocks were formed in Caledonian period, and thrust nappa structure was developed in Indosinian-Yanshanian period.As a result, there exist different periods of mineralized and nonmineralized quartz veins which might be divided into four phases consisting of seven stages, in which the thrust nappe phase(Ш)is closely related to gold mineralization, which mainly occurs along the crenulation cleavage zones in the middle of the thrust nappe structure, controlled jointly by the crenulation and the listric faults among them. Based on study of quartz by means of electron paramagnetic resonance, thermoluminescent curve and trace element content, the author has systPmati- cally discussed the difference between. quartzs of different phases and attitu- des in relation to gold mineralization, and established prospecting mineralo- gical criteria of quartzs in ore-bearing altered shatter zones as follows: 1 .Quartzs show smooth EPR spectra and Fe3+ line character, with auto- rotation concentration of the Al-O一center higher than 1.3 ×1014 spins/mg; 2. Single peak or double peak often appears in the thermoluminescent curve, and the total integration intensity of thermoluminescence is higher than 0.2; 3. Au and Ag can be detected in most quartzs by azAutron activation. K/Na ratios are generally in the range of 8.33一46.94,with only a few being 1.91.Their ratios, however, are exclusively lower than 1.75.It is therefore Considered that the K/Na ratios larger than. 3 can be used.

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谭秋明,1995,湖北省随州市北部变质岩中石英的找矿矿物学[J].岩石矿物学杂志,14(2):159~169. Tan Qiuming,1995,Prospecting Mineralogy of Quartz in Metamorphic Rocks of Northern Suizhou City, Hubei Province[J]. Acta Petrologica et Mineralogica,14(2):159~169.

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