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논문 기본 정보

자료유형
학술저널
저자정보
Gang Wang (Institute of Mineral Resources Chinese) Zong-qi Wang (Institute of Mineral Resources Chinese) Rui Shi (Institute of Geology Chinese Academy of) Ying-li Zhang (Institute of Mineral Resources Chinese) Kun-ming Wang (Institute of Mineral Resources Chinese)
저널정보
한국지질과학협의회 Geosciences Journal Geosciences Journal Vol.19 No.2
발행연도
2015.1
수록면
281 - 294 (14page)

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The Xiaozhen copper deposit is a typical deposit in the North Daba Mountain area polymetallic metallogenic belt. With the exception of geological prospecting research, however, few studies have been reported on the genesis of the deposit. This paper focuses on the mineralogical and isotope geochemical characteristics for the Xiaozhen copper deposit. Detailed field-work and microscope observations suggest that the ore’s structural fabric and mineral assemblages feature a medium–low-temperature hydrothermal pattern of metallogeny. The results of electron microprobe analysis indicate that chalcopyrite atomic ratio ΣMe/S = ~0.95–1.03, which suggests that they may not be of sedimentary origin. In addition, the S content of the pyrite is from 50.57 wt% to 53.16 wt% that is less than standard the value of 53.45 wt%, the Fe/S value is from 0.878 to 0.955, and the Ni content in pyrite is high even up to 0.38 wt%. These results, combined with Ni-Co graphic projection, indicate that the pyrite is of magmatic hydrothermal origin. Moreover, most of the sphalerites contain Se, and their calculated w(FeS) content ranging from 4.60 wt% to 10.37 wt% suggest magmatic origin and a formation temperature of approximately 300 °C. Further, the content of χ(Fe) is from 46.55 wt% to 46.97 wt% for pyrrhotites, suggesting they are clino-pyrrhotites. This result, combined with mineral assemblages and the Fe-S system diagram, indicates a mineralization temperature of approximately 310 °C. The δ34S values of the sulfide range from 2.6‰ to 11.5‰, indicating multisource properties. The 208Pb/204Pb has wider ratios (~38.897–39.918), reflecting that they contain abundant radiogenic lead. The Pb isotope tectonic setting and genetic classification plot show that the ore lead was provided mainly by the upper crust in addition to a few magma materials. The analytical results of fluid inclusions in the chalcopyrite show that the 3He/4He ratios are ~0.268–0.326 R/Ra, which is higher than the crustal ratios but grossly lower than that of the mantle fluid and that the 40Ar/36Ar ratios are higher than the argon isotopic composition of the atmosphere. Moreover, the He-Ar isotope system suggests that the source of the ore-forming fluids is predominantly meteoric low-temperature underground water, with a small amount of mantle fluid. In summary, this study has determined that the Xiaozhen copper deposit is a medium-temperature magmatic hydrothermal deposit. This finding is combined with metallogenic age to briefly describe the mineralization process.

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참고문헌 (64)

참고문헌 신청
Arnold, R.G / 1969 / Pyrrhotite phase relations below 304 ± 6 °C at <1atm total pressure / Economic Geology 64:405~419 google schola Bajwah, Z.U. / 1987 / Trace element distribution Co: Ni ratios and genesis of the big cadia iron-copper deposit, New South Wales Australia / Mineralium Deposita 22:292~300 google schola Birll, B.A / 1989 / Trace-element contents and partitioning of elements in ore minerals from the CSA Cu-Pb-Zn deposit, Australia, and implications for ore genesis / The Canadian Mineralogist 27:263~274 google schola Burnard, P. G. / 1999 / Mantle, crustal and atmospheric noble gases in Ailaoshan gold deposits, Yunnan Province, China / Geochimica et Cosmochimica Acta 63:1595~1604 google schola Carpenter, R.H. / 1964 / Range in solid solution and structure of naturally occurring troilite and pyrrhotite / American Mineralogist 49:1350~1365 google schola

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