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Radical change in tectonic regime and paleo-environment at the end of Neoarchean evidenced by a unique metal co-existing deposit

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Science Bulletin 2022年第23期67卷 2438-2448,M0004页

作者： Mingguo Zhai State Key Laboratory of Continent Dynamics Northwest UniversityXi'an 710075China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Planetary and Earth Science University of Chinese Academy of SciencesBeijing 100049China

Banded iron formation and Cu-Zn sulfide deposits within volcanic-argillaceous sequences(as volcanogenic massive sulphide deposits(VMS)-like type) occur together in the Qingyuan greenstone belt of the North China Craton,recording the first appearance of oxidized ores and sulfide ores co-existing in the early *** unique metal co-existing deposits should meet two requirements:tectonic setting and sedimentary *** regards to tectonic setting,plate-like tectonics might have started since the end of the Neoarchean because continents had grown large enough and there occurred volcanic arcs and backarc basins similar to modern ones in a *** melting of subducted continental crust is conductive to providing ore-forming *** for sedimentary environment,late Neoarchean seawater was rich in Fe^(2+) and *** oxidation of the seawater resulted possibly from frequent submarine volcanic eruptions and facilitated precipitation of the banded iron *** this point,it is also favorable for the enrichment of Cu and Zn ions in *** VMS-like deposits tended to form when the seawater was reduced *** of isotopic elements like sulfur,oxygen,iron and silicon support the above geological *** is shown that the geologic conditions only existed in the late Neoarchean and Paleoproterozoic for a short period of *** banded iron formations disappeared around 1.85 Ga,and the associated sulfide metal deposits also became dominant sedimentary exhalative deposits in the meso-Neoproterozoic Boring Billion,as a result of increasing oxidation of the oceans and the increasing maturity of the continental *** study is significant not only for decoding metallogenic genesis but also helping understand rapid change in Precambrian tectonic regimes and Earth’s environments.

关键词： Co-existing metal deposits Late Neoarchean indicator of transition Tectonic regimes Earth’s environments

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