Metasomatized mantle sources for orogenic gold deposits hosted in high-grade metamorphic rocks: Evidence from Hg isotopes
Geology, ISSN: 1943-2682, Vol: 52, Issue: 2, Page: 115-119
2024
- 16Citations
- 14Captures
- 1Mentions
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Most Recent News
Study Findings from East China University of Technology Provide New Insights into Geology (Metasomatized mantle sources for orogenic gold deposits hosted in high-grade metamorphic rocks: Evidence from Hg isotopes)
2023 DEC 18 (NewsRx) -- By a News Reporter-Staff News Editor at NewsRx Science Daily -- Fresh data on geology are presented in a new
Article Description
Investigation of Hg isotope ratios of gold-related sulfides and penecontemporaneous mafic dikes from four orogenic gold provinces on the margins of the North China Craton and Yangtze Craton identifies three orogenic gold deposit (OGD) groups from different tectonic regimes. Ore-related sulfides of group 1 OGDs and mafic dikes from the craton margin reworked via oceanic subduction mostly have positive ΔHg values. The group 2 OGDs and mafic dikes from the margin that witnessed complex oceanic and continental subductions have mixed positive to negative ΔHg values. The group 3 OGDs on the margin that experienced continental subduction have dominantly negative ΔHg values. These isotopic differences indicate subduction histories have a first-order control on the distinct sources for the OGDs. It indicates that OGDs were derived from fluids from the mantle lithosphere metasomatized by contrasting subduction components, not from metamorphic fluids as is widely accepted. Group 1 OGDs and dikes were sourced from metasomatized mantle, which inherited the positive ΔHg of both recycled marine sediments and seawater during oceanic subduction, whereas group 3 with negative ΔHg was derived from mantle lithosphere metasomatized by subduction of mainly continental components. This genetic model identifies regions with high-grade metamorphic rocks above metasomatized mantle lithosphere as promising new OGD exploration targets.
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