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• W2904393927 endingPage "84" @default.
• W2904393927 startingPage "66" @default.
• W2904393927 abstract "Three episodes of mafic magmatism are identified by zircon and baddeleyite U-Pb dating at 2299 ± 17 Ma, 1703 ± 8 Ma and 1511 ± 14 Ma in the southwestern Yangtze Block. These mafic rocks have tholeiitic compositions with enrichment of LILE but an absence of Nb, Ta, Zr, Hf anomalies, features similar to E-MORB. They have La/Ta (<22) and La/Nb (<1.5) ratios similar to asthenosphere-derived mafic melts. The ca. 2.3 Ga, ca. 1.7 Ga and ca. 1.5 Ga mafic rocks have eNd (t) values of +0.2 to +4.3, −2.8 to +2.8 and +0.7 to +5.8, respectively. Furthermore, the ca. 2.3 Ga and ca. 1.7 Ga mafic rocks have eHf (t) values varying from −3.6 to +0.8 and +0.1 to +9.2. All these geochemical and isotopic data indicate that the studied mafic rocks may be dominantly sourced from asthenospheric mantle. Thermodynamic modeling indicates that the mantle potential temperatures for the studied ca. 2.3 Ga and ca. 1.7 Ga dolerites are 1447 °C −1568 °C, 1511 °C −1529 °C, suggesting relatively hot mantle below the southwestern Yangtze Block at ca. 2.3 Ga and ca. 1.7 Ga. REE modeling indicates the ca. 2.3 Ga and ca. 1.5 Ga dolerites were generated by low degree melting (3–15%) of mantle source, while the ca. 1.7 Ga gabbros were derived from variable degree melting (∼5–20%) of mantle source. Fractionation of olivine, pyroxene and plagioclase contributes to changing the chemical compositions of the primary magma, while crustal contamination was relatively insignificant. These three episodes of mafic magmatism were generated in extensional setting. The ca. 2.3 Ga dolerite represents the oldest mafic magmatism identified in the southwestern Yangtze Block by far, documenting the dispersion of the Yangtze Block from the Nunavutia supercraton. Comparing the younger magmatic barcode records for various crustal blocks shows that the mafic magmatism at ca. 1.75–1.65 Ga in the Yangtze Block, has matches in northwestern Laurentia and southern Siberia. This period of extensive magmatism was presumably linked to the early attempted breakup of the Columbia/Nuna supercontinent, indicating tight linkage among these continents in that supercontinent. (Less)" @default.
• W2904393927 created "2018-12-22" @default.
• W2904393927 creator A5002400139 @default.
• W2904393927 creator A5017606878 @default.
• W2904393927 creator A5018161137 @default.
• W2904393927 creator A5022614108 @default.
• W2904393927 creator A5030639897 @default.
• W2904393927 creator A5043453591 @default.
• W2904393927 creator A5046635035 @default.
• W2904393927 date "2019-03-01" @default.
• W2904393927 modified "2023-10-18" @default.
• W2904393927 title "Petrogenesis of Paleo-Mesoproterozoic mafic rocks in the southwestern Yangtze Block of South China: Implications for tectonic evolution and paleogeographic reconstruction" @default.
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