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An upper crustal ophiolite remnant within the Feather River Ultramafic belt, California: Tectonomagmatic origins and implications for its evolution

Jun Luo*1, John Wakabayashi2, Zhiliang He1, et al.
1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and EffectiveDevelopment,Petroleum Exploration and Production Research Institute of SINOPEC, Beijing 100083, PR China;2. Department of Earth and Environmental Sciences, California State University, Fresno, California 93740, USA;3. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, PR China;4. Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China

Abstract:The 150-km-long Feather River ultramafic belt (FRB), of the northern Sierra Nevada, California, consists of serpentinized ultramafic rocks, gabbroic rocks, with lesser amounts of amphiboliticrocks.The gabbroic rocks contain metagabbro and dikes within it. Based on the electron microprobe analyses, the metagabbro consists of typical igneous composition for clinopyroxene and early hornblend, indicating that they bear low grade metamorphism. The gabbroic rocks show Nb and Ta depletion in primitive – mantle normalized plots that issimilar to typical island arc rocks. We present that the metagabbro within the ultramafic rocks is forming in the suprasubduction zone setting, which contrasts from the amphibolitic rocks shown in Smart and Wakabayashi(2009).Tectonic models are presented for the metagabbro and amphibolitic rocks in FRB. The low P burial metamorphism of the upper plate metagabbro and the high grade amphibolite rocks are typical of relationships of upper plate ophiolites to metamorphic soles. The amphibolitic rocks record as metamorphic sole forming during subduction initiationbeneath the ultramafic rocks and metagabbro. The unusual and protracted tectonic history of the FRB is similar to other ophiolite belts of the Cordillera of California but differs in the lack of crustal rocks.

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Keywords:high-grade rocks, metamorphic sole, ophiolite, suture zone

DOI:
10.1007/s12583-017-0964-9
CLC number:
U469.72
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