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- W2378981311 abstract "Whole rock K-Ar data yielded ages of 146～54 Ma for the mafic dikes from the coastal areas of Guangdong Province, suggesting that emplacement of the mafic dikes took mainly place in the Cretaceous. The K-Ar data can be divided into five periods (146, 138～132, 112～105, 99～82, 75～54Ma). Two series of the mafic dikes (medium-K and high-K) can be distinguished according to K_2O/Na_2O ratios and K_2O contents and the Ta-Nb anomalies in the MORB-normalized trace element distribution patterns. The K_2O/Na_2O ratios of one series are 0.5, and K_2O contents are 1.3% with weak negative Ta-Nb anomalies. The K_2O/Na_2O ratios of another series are 0.5, and K_2O contents 1.3% with strong negative Ta-Nb anomalies. Using K_2O vs. SiO_2 diagram, first series belongs to medium-K rocks, and another falls into the field of high-K rocks or shoshonitic rocks. The medium-K mafic dikes are distributed in upper mantle downwarping areas and the high-K mafic dikes are distributed in the upper mantle uplifting areas or slope areas. Two series of the mafic dikes have different magmatic source. In the north part of the area, the asthenospheric material invaded and corroded the lithospheric enriched mantle Ⅰ, forming the medium-K mafic dikes. With the ages becoming younger, the contribution of lithospheric enriched mantle Ⅰ to mafic dike magmas was increased. Late, the mafic magmatism in the north migrated toward Liangping, Xinfeng. In the south, the asthenospheric material invaded and corroded the lithospheric enriched mantle Ⅱ, forming the high-K mafic dikes. With the ages becoming younger, the contribution of lithospheric enriched mantle Ⅱ to mafic dikes was increased, showing the lithospheric mantle in the south was increasingly corroded by the asthenospheric material. Late, the mafic magmatism in the south migrated to Shanshui rift and Nanao rift." @default.
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- W2378981311 date "2009-01-01" @default.
- W2378981311 modified "2023-09-25" @default.
- W2378981311 title "Geochemistry and genesis of mafic dikes from the coastal areas of Guangdong Province, China." @default.
- W2378981311 hasPublicationYear "2009" @default.
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