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• W2892095746 endingPage "161" @default.
• W2892095746 startingPage "146" @default.
• W2892095746 abstract "The Okinawa Trough (OT) is a back-arc, initial marginal sea basin located behind the Ryukyu arc–trench system. Analysis of the plagioclase phenocrysts from two basalts and two silicic rocks dredged from different locations in the southern Okinawa Trough (SOT) provides a detailed record of the nature and composition of and changes in the magma within the magmatic system. Plagioclase phenocrysts from the basalt record 87Sr/86Sr values of 0.704015–0.704360 and 0.704686–0.704863, respectively, which overlap with previously reported whole-rock values and suggest that the parent magma of the plagioclase represents upwelling mantle materials influenced by a subducted component. Plagioclase-melt thermobarometry records the crystallization of plagioclase phenocrysts in the basalt at the bottom of the lower crust near the Moho (depths of ~20 ± 7.5 km and ~25 ± 7.5 km). The temporal record of the Sr and Ba contents in the melt recorded by these crystals, which were calculated using partition coefficients and the Sr isotopic compositions of the plagioclases from the basalts, demonstrates the existence of two distinct mafic magmas within the SOT due to the presence of different subducted components (i.e., the subduction of the Gagua Ridge). Significant textural variations and wide ranges in the An35-89 and trace element concentrations and in situ Sr isotopic compositions (0.705748–0.707520) are observed in plagioclase crystals from silicic rocks in the SOT. The barometry results for the plagioclases from silicic rocks yield a wide range of crystallization depths ranging from 6.6 to 17.8 km. The Sr isotopic compositions and trace element concentrations of high-An80 plagioclases in basalt and silicic rocks indicate that there is no direct relationship between these two magma chambers. The negative correlation between the An contents and the Sr isotopic compositions in the plagioclases from silicic rocks indicates that more upper continental crust materials joined the magma source as its evolution proceeded. The presence of core-sieved plagioclase in the silicic rock indicates that decompression and/or magma mixing occurred. Thus, we propose a multilayer magma chamber system to explain the complex plagioclase crystals in silicic rocks. Two potential mush zones were recognized; their generation may have been controlled by the adiabatic decompression melting of lower crustal materials resulting from crustal extension or the post-collisional extension of the Northern Taiwan Mountain Belt. The two potential mush zones at greater depths are relatively basic, whereas the shallow magma reservoirs, which are the host magmas of the plagioclase, are relatively silicic." @default.
• W2892095746 created "2018-09-27" @default.
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• W2892095746 date "2018-10-01" @default.
• W2892095746 modified "2023-10-18" @default.
• W2892095746 title "The dynamics of the southern Okinawa Trough magmatic system: New insights from the microanalysis of the An contents, trace element concentrations and Sr isotopic compositions of plagioclase hosted in basalts and silicic rocks" @default.
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