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REVISION OF SOME LOWER PALAEOZOIC SECTIONS OF CENTRAL china

地质学报 1939年第4期 456-480页

作者： A.W.GRABAU chief palaeontologist of the national geological survey of china and china foundation research professor of geology.

During the review of the Ordovician Sections of china and theirrelation to both,the older and younger formations,it has become apparentthat a reclassification of the formations in some of the sections is needed.

关键词： REVISION OF SOME LOWER PALAEOZOIC SECTIONS OF CENTRAL china

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Ore Forming Fluids of Several Gold Deposits in the Irtysh Gold Belt, Xinjiang, china

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Journal of Earth Science 2020年第2期31卷 298-312页

作者： Yingwei Wang Jiuhua Xu Rufu Ding Hui Zhang Xihui Cheng Chunjing Bian Shaanxi Institute of geological survey Xi'an 710054China Shaanxi Mineral Resources and geological survey Xi'an 710068China Department of Resource Engineering University of Science and TechnologyBeijing 100083China china Non-Ferrous Metals Resources geological survey Beijing 100012China

The metallogenic environment of the Irtysh gold belt in Xinjiang is studied in *** metallogenic geological background,metallogenic conditions and ore-controlling factors of the gold deposits in eastern,central and western regions of the metallogenic belt are *** metallogenic structure of the Irtysh tectonic belt has the characteristics of diverging to the west and converging to the *** ore controlling by ductile shearing and magmatic activity in Irtysh gold belt result in zoned and segmented distribution of gold *** the fluid inclusion research and H-O-S isotope analysis,the evolution regularity of gold ore-forming fluids in the region was *** radiation X-ray fluorescence was used to analysis the concentration of metal elements in a single fluid inclusion,explaining the occurrence and migration process of Au in hydrothermal *** source of ore forming minerals in western gold deposit is more closely related to magmatic activity,and the structural metamorphism of eastern gold deposit has greater influence on *** fluids of gold deposits are characterized by metamorphic water(and magmatic water)in the early stage and mixed with meteoric water in the late *** the metallogenic elements are enriched in CO2 rich *** Au is mainly activated,migrated and enriched with the mixed fluid of magmatic hydrothermal,metamorphic hydrothermal and atmospheric precipitation in the medium-low temperature,shallow to medium-deep environment.

关键词： Irtysh gold belt ore forming fluids H-O-S isotope synchrotron radiation X-ray fluorescence metallogenic model

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