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• W4313406589 endingPage "107012" @default.
• W4313406589 startingPage "107012" @default.
• W4313406589 abstract "Addition of slab fluids, including slab aqueous solutions and sediment hydrous melts, into the mantle plays a key role in the generation of mafic arc igneous rocks above subduction zones. Thus, identification of the nature and origin of slab fluids is a topic of great importance. Here, we carried out an integrated study on three types of Late Paleozoic mafic arc igneous rocks from Southwestern Tianshan in Western China to distinguish slab aqueous solutions from sediment melts in generating arc magmatism. Zircon UPb dating yields ages of 325–324 Ma for southern Xinyuan (SXY) diabases, 313 Ma for Duku Road basalts (DKR) and 307 Ma for northern Zhaosu (NZS) diabases, respectively. These mafic igneous rocks all exhibit typical arc-like trace element distribution patterns, but show a series of differences in trace elements, radiogenic isotopes and other geochemical variations. Generally, the DKR and NZS rocks are characterized by the enrichment in fluid-mobile elements such as Ba, K, Pb and Sr, depletion in whole-rock Sr-Nd-Hf and zircon Hf isotopes. By contrast, the SXY rocks exhibit the enrichment in melt-mobile elements such as LILE, LREE and Th, relatively high δ18O values and enriched whole-rock Sr–Nd–Hf and zircon Hf isotopes. What's more, the DKR and NZS rocks show remarkably higher Ba/Th, Pb/Ce, Sr/Nd and Ba/La ratios than those of normal mid-ocean ridge basalts (MORB), while SXY rocks are characterized by higher Th/La, Th/Nd and Th/Yb ratios relative to those of normal MORB, similar to seafloor sediments. These geochemical differences can be explained by the metasomatism of mantle wedge peridotites by two distinct properties of liquid phase released from subducting South Tianshan oceanic slab, in which the subducting slab-derived aqueous solution metasomatism is required for the generation of the DKR and NZS igneous rocks, while the sediments-derived hydrous melt metasomatism is required for the generation of the SXY rocks. This qualitative identification is further affirmed by quantitative model calculations of trace elements and SrNd isotopes of the studied igneous rocks. Therefore, our study provides the geochemical evidence for chemical metasomatism of the mantle wedge peridotite by incorporation of two properties of metasomatic agents in oceanic subduction channel." @default.
• W4313406589 created "2023-01-06" @default.
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• W4313406589 date "2023-02-01" @default.
• W4313406589 modified "2023-10-17" @default.
• W4313406589 title "Distinct contribution of aqueous solutions and hydrous melts to the mantle sources: Geochemical evidence from Late Paleozoic igneous rocks in Southwestern Tianshan, Western China" @default.
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• W4313406589 doi "https://doi.org/10.1016/j.lithos.2022.107012" @default.
• W4313406589 hasPublicationYear "2023" @default.
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