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W3170702861 endingPage "500" @default.
W3170702861 startingPage "487" @default.
W3170702861 abstract "Abstract The nature and source of magmatism associated with large igneous provinces (LIPs) remain disputed. Here we investigate the role of recycled materials that contributed to mantle heterogeneity in the Tarim Large Igneous Province (TLIP) in China through integrated Zn–Mg–Sr–Nd isotopes of a rare tephritic rock suite. The Sr–Nd isotopes [(87Sr/86Sr)i = 0.70368–0.70629; εNd(t) = −0.25–4.64] and δ26Mg values (−0.23 to −0.34) of the tephritic porphyries are consistent with a normal mantle origin. In contrast, the whole rock and pyroxene phenocrysts yield δ66Zn values of +0.28 to +0.46 and +0.30 to +0.39, which are slightly heavier than those of the terrestrial mantle (+0.16 ± 0.06) and mid-oceanic-ridge basalts (MORBs) (+0.27 ± 0.05). We exclude the possibility that the heavy Zn isotopes of the Wajilitag tephritic porphyries are caused by magmatic processes such as fractional crystallization and partial melting and correlate the isotopic features to the role of altered oceanic crust along with magnesite in the mantle source. The Wajilitag tephritic porphyry displays trace-element patterns similar to those of the melts from natural hornblendite, especially those of hornblendite + peridotite. Additionally, the geochemical characteristics such as enrichment in Nb and Ta, depletion in K, high TiO2, and constant Na2O/K2O ratios also suggest that the tephritic porphyries were derived from an amphibole-bearing source contributed by altered oceanic crust along with sedimentary carbonates. Our study provides insight into the contribution of subducted materials to the mantle heterogeneity beneath the TLIP and highlights the role of subduction in the deep carbon cycle and subducted slab-lithosphere-plume interaction in the generation of LIPs." @default.
W3170702861 created "2021-06-22" @default.
W3170702861 creator A5000573728 @default.
W3170702861 creator A5015107909 @default.
W3170702861 creator A5044298413 @default.
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W3170702861 creator A5058906511 @default.
W3170702861 creator A5063972996 @default.
W3170702861 creator A5073697986 @default.
W3170702861 creator A5075850550 @default.
W3170702861 creator A5078152672 @default.
W3170702861 date "2021-06-15" @default.
W3170702861 modified "2023-09-29" @default.
W3170702861 title "Mantle source of tephritic porphyry in the Tarim Large Igneous Province constrained from Mg, Zn, Sr, and Nd isotope systematics: Implications for deep carbon cycling" @default.
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