Prospecting Mineralogy of Quartz in Metamorphic Rocks of Northern Suizhou City,Hubei Province
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    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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