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Study on the Two Kinds of Important Zinc-lead Deposits in Sedimentary Basin of Southern Tianshan, Xinjiang

Author: LiZhiDan
Tutor: XueChunJi
School: Chinese Geology University (Beijing)
Course: Mineralogy,petrology, Mineral Deposit Geology
Keywords: Depositional Environment Lead-zinc deposits Hoos Braque Uragiin South Tianshan
CLC: P618.4
Type: Master's thesis
Year: 2011
Downloads: 97
Quote: 2
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Abstract


South Tianshan Basin sedimentary environment rich in lead and zinc resources. Typical lead-zinc deposits are mainly of two types: one for the Late Paleozoic carbonate-hosted lead-zinc deposits, the Hoos Braque, Shalitashen as representative of a class; Cenozoic basins clastic Yung Mine lead-zinc deposits, uragiin representative. The two types of lead-zinc deposits has important theoretical and economic significance. Predecessors typical deposit has been made a lot of research, but the the genesis type still a lot of controversy, severely restricted the area of ??lead and zinc ore prospecting. Need to raise awareness of the typical deposit geology, geochemistry and genesis. Lead-zinc deposits in the Late Paleozoic Devonian carbonate host rocks, the ore body was layered like a layered, plate, generally strictly stratabound ore minerals are sphalerite and galena macro and micro obvious epigenetic mineralization characteristics of wall-rock alteration is weak. Mesozoic-Cenozoic Basin the Nei Wula root lead-zinc deposits below the the Cretaceous glutenite and Paleocene dolomite content host rock, the ore body was layered stratiform ore minerals are sphalerite, galena, to dip like the output of the vein wall rock alteration is weak. Late Paleozoic basin 内霍什布拉克 lead-zinc sheets mineral rare earth element the composition implied mineralization and recrystallization micrite associated pyrite trace elements Co / Ni lt; 1, implied the deposition causes of hydrothermal carbonate minerals C, H, O isotope indicates that the ore-forming fluid sequestration of water in the basin, where the carbon comes mainly from the surrounding rock carbonate. Sulfide sulfur isotope composition (mainly 16 ‰ ~ 24 ‰) reflect sulfur thermochemical derived from marine sulfate reduction; The lead isotope instructions surrounding rock into minerals. The Cenozoic basin Neiwu La root deposit of ore formation geochemical characteristics indicate the host rock feldspar quartz sandstone and lithic quartz sandstone, the tectonic setting of the source area for the passive continental margin. Sulphide sulfur isotopic composition (-27.9 ‰ ~ 14.6 ‰) to indicate the mineralization required of sulfur from adjacent strata the biodynamic sulfate fractionation, the isotopic composition of lead indicated as minerals derived from the upper crust and orogenic belt denuded area. Combined lead-zinc mineralization theoretical status quo and typical deposit geology, geochemical studies and integrated to determine the genetic type lead-zinc deposits in the the South Tianshan late Paleozoic basin MVT; the Cenozoic basins Neiwu La root lead-zinc deposits in the lead-zinc deposits with similar causes type of contrast, the judgment which is a very large sandstone-type lead-zinc deposits in the a few continental sedimentary environment. And think deposit uragiin exploration breakthrough pioneering the successful example of the Mesozoic-Cenozoic continental sandstone looking very large lead-zinc deposits in addition to the golden dome type deposits outside.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Non-ferrous metals
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