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- W2365792330 abstract "Analyses of geological data indicate that the diabase in the third member of Xiangshan Group is of Mid-Late Cambrian in age. The diabase is characterized by high Na, Mg and low K, Ti contents, low total REE contents, and absence of fractionation between LREEs and HREEs, in addition to no pronounced Eu anomaly. The REE patterns normalized by chondrite are lowly and slightly inclined, while the value of trace elements is about 2-10 times higher than that for primitive mantle. In comparison with the case of primitive mantle, the trace element data for the diabase show relative depletion in LILEs and no fractionation in HFSEs, while N-MORB normalized trace element spidergrams show enrichment in LILEs. These geochemical characteristics suggest that the diabase belongs to the series of oceanic tholeiite derived from extensional setting. In addition, results of chemical composition, sedimentary environment and rock assemblage demonstrate that a continental margin in spreading tectonic setting have existed between the southwestern margin of Ordos plate and the southern Alashan plate." @default.
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- W2365792330 date "2007-01-01" @default.
- W2365792330 modified "2023-09-24" @default.
- W2365792330 title "GEOCHEMICAL CHARACTERISTICS AND TECTONIC SETTING OF DIABASE IN XIANGSHAN GROUP,NINGXIA" @default.
- W2365792330 hasPublicationYear "2007" @default.
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