Direct Re-Os dating of manganese carbonate ores in Zunyi, Guizhou and implication for their genesis

IF 3.2 2区地球科学 Q1 GEOLOGY

Ore Geology Reviews Pub Date : 2025-03-20 DOI:10.1016/j.oregeorev.2025.106565

Guodong Liu , Yong Fu , DaiZhao Chen , Chuan Guo , Feng Tian , Chao Li , Shuai Chao Wei , Ran Jiang , Shuang Yan , Deng Chen , Rui Chen

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Abstract

The Emeishan Large Igneous Province (ELIP) activities of Middle Permian (260.1 ∼ 259.5 Ma) in the Upper Yangtze block, Southwest China induced large-scale crustal doming, re-organization of basin-platform configuration (or topography) and facies distribution of surrounding marine platform, relative sea-level changes, transition of source materials and fluxes as well as biotic turnover. Several Middle Permian marine sedimentary manganese deposits (MSMDs) precipitated in the intraplatform rift (or trough) surrounding the central doming region of ELIP in the Upper Yangtze block, notably in Zhunyi area, northeastern Guizhou, which was suggested to be linked to the ELIP activity; however, the temporal linkage was loosely constrained. To establish the causal linkage, direct Re-Os isotopic dating was carried out upon the manganese carbonates on the top of the Middle Permian Maokou Formation in Zunyi, Guizhou, yielding an isochron age of 262.8 ± 2.5 Ma, thus establishing a robust temporal connection to the ELIP activity. Additionally, the initial ¹⁸⁷Os/¹⁸⁸Os ratio is 0.537 ± 0.012, lower than that of the coeval seawater, indicating additional influx of submarine mantle-sourced hydrothermal fluids likely associated with the ELIP.

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来源期刊

Ore Geology Reviews 地学-地质学

CiteScore

6.50

自引率

27.30%

发文量

546

审稿时长

22.9 weeks

期刊介绍： Ore Geology Reviews aims to familiarize all earth scientists with recent advances in a number of interconnected disciplines related to the study of, and search for, ore deposits. The reviews range from brief to longer contributions, but the journal preferentially publishes manuscripts that fill the niche between the commonly shorter journal articles and the comprehensive book coverages, and thus has a special appeal to many authors and readers.