Petrogenesis and tectonic significance of mafic-ultramafic rocks from southwestern Yunnan, China

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Late Palaeozoic Ultramafic Lavas in Yunnan, SW China, and their Geodynamic Significance

marine sequences within several orogenic belts in YunWe report petrological and geochemical data on ultramafic pillow nan, SW China (Figs 1 and 2; Fang et al., 1996). These lavas from Late Palaeozoic marine sequences in Yunnan, SW lavas have been interpreted to be oceanic plateaux or China. These lavas have >26 wt % MgO, euhedral to subhedral seamount eruptive rocks associated with mantle plume...

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The Range of Spinel Compositions in Terrestrial Mafic and Ultramafic Rocks

Compositional fields for spinels from a wide variety of mafic– a wide range of conditions from mafic and ultramafic ultramafic igneous rock types and tectonic environments have been magmas and, in the case of chromites, are often among determined from a global database of over 26 000 analyses. the first phases to crystallize. They also exhibit a wide These fields are defined using contoured dat...

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ژورنال

عنوان ژورنال: Comptes Rendus Geoscience

سال: 2019

ISSN: 1631-0713

DOI: 10.1016/j.crte.2019.04.004