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Factors Controlling Deposition of Metallic Minerals in the Meng’entaolegai Ag-Pb-Zn Deposit, Inner Mongolia, China: Evidence from Fluid Inclusions, Isotope Systematics, and Thermodynamic Model by Yang, He; Ma, Wanli; Wang, Rui; Ma, Xueli; Wang, Keyong is a Earth and Planetary Sciences article available to read on EtoBox.

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The Meng'entaolegai Ag-Pb-Zn vein-type deposit in Inner Mongolia, NE China is hosted in biotite/muscovite granite. This deposit includes the western (Zn-rich, deepest), middle (Zn-Pb rich) and eastern (Pb-Ag-rich, shallowest) ore-blocks. To better understand the metallogenic processes in ore district, we have undertaken a series of studies including fluid inclusion microthermometry, H-O-S-Pb isotope compositions and thermodynamic modeling. Based on fluid inclusion petrography, microthermometry results and H-O isotope compositions, the ore-forming H2O-NaCl fluid inclusions are characterized by medium temperature and medium salinity. And two kinds of fluid processes (boiling in western and middle ore-block and fluid mixing in the eastern ore-block) were identified to explain the ore fluid evolution. More importantly, log ƒO 2 -pH diagrams of δ 34 S contours with the stability fields of Fe-and Cu-, Zn-, Pb-, and Ag-bearing minerals were constructed to restore the physicochemical conditions of ore-forming fluid in the western (270 °C and 80 bars), middle (250 °C and 70 bars), and eastern (230 °C and 50 bars) ore-blocks. As a result, the ore-forming conditions in the western and middle

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Author

Yang, He; Ma, Wanli; Wang, Rui; Ma, Xueli; Wang, Keyong

Publisher

China University of Geosciences; Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC (ISSN 1674-487X)

Published

2020

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)