Genesis and source affinities of heterogeneous ultramafic rocks in the North Kongling Complex, Yangtze craton: Architecture of a Paleoproterozoic accretionary orogen
| Autor: | Hongtao Peng, Hao Deng, Qingsen Han, Songbai Peng, Ali Polat, Timothy Kusky |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | GSA Bulletin. |
| ISSN: | 1943-2674 0016-7606 |
| DOI: | 10.1130/b36649.1 |
| Popis: | Ultramafic massifs are minor but meaningful components of orogens because they record the mantle properties and the processes of plate generation, subduction, accretion, and collision, thus providing key information about crust-mantle interaction processes and the evolution of orogens. Here, we present an integrated study of field observations, whole-rock and mineral geochemistry, zircon U-Pb ages, and whole-rock Sm-Nd and Re-Os isotopes for serpentinized harzburgites and olivine pyroxenites from the Paleoproterozoic Shuiyuesi mélange belt, North Kongling Complex, to constrain the tectonic evolution of the Yangtze craton, South China. The serpentinized harzburgites are characterized by enrichment of light rare earth elements (LREEs) and negative εNd(t) (−4.3 to −3.9) values, but they have high olivine Mg# (91.7−93.1) and very low Re contents ( |
| Databáze: | OpenAIRE |
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