Carbon and Oxygen Isotope Compositions of Gangue Carbonates in Pb-Zn Ore Deposits in Luanchuan District, Southwest Henan Province

Abstract

Abstract:

It has been made a big progress in Pb-Zn Prospecting in southwestern Henan Province recently.Especially, more than ten vein groups of Pb-Zn-Ag mineralization (more than 100 Pb-Zn-Ag veins) have been found in Luanchuan district, which shows a broad prospection of Pb-Zn-Ag resources.The scientific research on these Pb-Zn-Ag ore veins enriches knowledge on regional metallogeny of southern margin of North China Craton and promotes the pace of Pb-Zn prospecting.Pb-Zn ores in Luanchuan district occur in skarn around Yanshannian porphyries or in fractures (vein type) peripheral to Yanshannian porphyries.Gangue carbonate of vein type Pb-Zn ore has carbon and oxygen isotope compositions (Chitudian Pb-Zn deposit: δ¹³C ranges from-3.66‰ to -2.82‰ and δ¹⁸O ranges from 10.31‰ to 15.86‰; Bailugou Pb-Zn deposit: δ¹³C ranges from -3.00‰ to 1.80‰，δ¹⁸O ranges from 9.40‰ to 17.70‰; Lengshuibeigou Pb-Zn deposit: δ¹³C ranges from -4.90‰ to -0.40‰，δ¹⁸O ranges from 6.00‰ to 12.50‰) between typical marine limestone (δ¹³C is 0 ± 2‰，δ¹⁸O ranges from 28‰ to 30‰) and magmatic rock (δ¹³C ranges from-3‰ to -30‰，δ¹⁸O ranges from 6‰ to 12‰；mantle: δ¹³C ranges from-5‰ to -7‰), which shows the ore forming fluid and metals bear characteristics of dual function and both sources of magma and strata.It can be concluded from synthetic analysis that Pb-Zn ore deposits in Luanchuan district are skarn type or magmatic hydrothermal filling-metasomatic type

Key words: lead and zinc deposit, carbon and oxygen isotope, magmatic hydrothermal filling-metasomatic type deposit, skarn type deposit, Luanchuan,Southwest Henan Province

CLC Number:

P618.4

DUAN Shi-Gang, XUE Chun-Ji, FENG Qi-Wei, GAO Bing-Yu, LIU Guo-Yin. Carbon and Oxygen Isotope Compositions of Gangue Carbonates in Pb-Zn Ore Deposits in Luanchuan District, Southwest Henan Province[J]. Geoscience, 2010, 24(4): 767-775.

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