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Metamorphic fluid superimposition of the Changba-Lijiagou Pb-Zn deposit, West Qinling Orogen, central China (2018)

Ni, P., Wang, T.-G., Wang, G.-G., Li, W.-S., Pan, J.-Y.

Geological Society of London

In: Geological Society, London, Special Publications

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Publication Date: 2018

Description: 〈p〉Several large to giant Pb–Zn deposits in the West Qinling Orogen in central China are argued to be of SEDEX (sedimentary exhalative) type or of epigenetic hydrothermal type. Additionally, the nature of the mineralizing fluids is poorly known. Our observations suggest that early stage primary marine sedimentary mineralization is characterized by laminated or disseminated fine-grained massive sulphide ores, and late stage metamorphic superimposition is represented by coarser equigranular annealed textures and the disruption of thinly laminated structures. Three coexisting types of fluid inclusions were recognized: H〈sub〉2〈/sub〉O–NaCl (type I); H〈sub〉2〈/sub〉O–NaCl–CH〈sub〉4〈/sub〉–CO〈sub〉2〈/sub〉 (type II); and CH〈sub〉4〈/sub〉–CO〈sub〉2〈/sub〉 (type III). The coexisting type I and II inclusions show similar homogenization temperature values but different salinities, indicating that fluid immiscibility occurred. Formation pressures calculated using type III inclusions are high (72.5–174.5 MPa). The lead isotopes of the sulphides and calcites show a narrow range. The primary sedimentary ore textures plus the similar lead isotopes between the ores and the wall rocks suggest a SEDEX origin, but the annealed recrystallization textures, the immiscible carbonic fluid inclusion assemblages and higher formation pressures suggest a strong late-stage metamorphic superimposition on the original SEDEX-type ores.〈/p〉

Print ISSN: 0375-6440

Electronic ISSN: 2041-4927

Topics: Geosciences

Published by Geological Society of London

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Relationship between Maceral of Coal and Coal-bed Methane adsorption ability in Sihe Coalmine of Qinshui Basin, China (2018)

M S Wang, G G Zou and R B Zhu

Institute of Physics (IOP)

In: IOP Conference Series: Materials Science and Engineering

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Publication Date: 2018-05-17

Description: Maceral components and its content of coal were divided based on the microscopic characteristics of coal. The Langmuir volume and the Langmuir pressure were tested, and the Langmuir volume represents the adsorption capacity of coal. The formation of coal bed methane is affected by the partition of the maceral components in coal. Therefore, the relationship between maceral composition and coal bed methane adsorption capacity of coal was analyzed. The results show that the maceral components of coal are dominated by vitrinite and inertinite in the study area, and the content of inertinite is below 32%. The vitrinite group has a negative linear correlation with the Langmuir volume, and the inertia composition has a positive linear correlation with it. The cellular structures in the inertinite are the main site of coal bed methane enrichment. The microstructure of coal affects the coalbed methane content and the stage of hydrocarbon generation in coal. This indicates that the micros...

Print ISSN: 1757-8981

Electronic ISSN: 1757-899X

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Published by Institute of Physics (IOP)

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Metamorphic fluid superimposition of the Changba-Lijiagou Pb-Zn deposit, West Qinling Orogen, central China (2018)

Ni, P., Wang, T.-G., Wang, G.-G., Li, W.-S., Pan, J.-Y.

Geological Society (of London)

In: Special Publications / Geological Society London

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Publication Date: 2018-05-23

Description: Several large to giant Pb–Zn deposits in the West Qinling Orogen in central China are argued to be of SEDEX (sedimentary exhalative) type or of epigenetic hydrothermal type. Additionally, the nature of the mineralizing fluids is poorly known. Our observations suggest that early stage primary marine sedimentary mineralization is characterized by laminated or disseminated fine-grained massive sulphide ores, and late stage metamorphic superimposition is represented by coarser equigranular annealed textures and the disruption of thinly laminated structures. Three coexisting types of fluid inclusions were recognized: H 2 O–NaCl (type I); H 2 O–NaCl–CH 4 –CO 2 (type II); and CH 4 –CO 2 (type III). The coexisting type I and II inclusions show similar homogenization temperature values but different salinities, indicating that fluid immiscibility occurred. Formation pressures calculated using type III inclusions are high (72.5–174.5 MPa). The lead isotopes of the sulphides and calcites show a narrow range. The primary sedimentary ore textures plus the similar lead isotopes between the ores and the wall rocks suggest a SEDEX origin, but the annealed recrystallization textures, the immiscible carbonic fluid inclusion assemblages and higher formation pressures suggest a strong late-stage metamorphic superimposition on the original SEDEX-type ores.

Print ISSN: 0305-8719

Electronic ISSN: 2041-4927

Topics: Geosciences

Published by Geological Society (of London)

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