Geochemical Characteristics of Volcanic Rocks from ODP Site 794, Yamato Basin: Implications for Deep Mantle Processes of the Japan Sea
作者： CHEN Shuangshuang , LIU Jiaqi , GUO Zhengfu , CHEN Shengsheng , SUN Chunqing
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摘要: Deep mantle processes and the dynamic mechanism of magmatism in Japan Sea Basin are important that have not been studied detail. In this paper, systematic evaluation basalt samples from ocean drilling program Site 794 was performed, which included petrography, whole-rock major- trace-element analysis, Sr-Nd-Pb isotopic composition, electron microprobe analysis plagioclase clinopyroxene. These basalts belong to tholeiitic series with porphyritic texture massive Ca-rich plagioclase, clinopyroxene, minor olivine phenocrysts. The characterized as flat rare earth elements high-field-strength remarkably low ratios (La/Yb)N (0.75–2.51), significant positive anomalies Ba, Sr, Rb no Eu anomaly (δEu = 0.99–1.36). showed relatively high 87Sr/86Sr (0.70425–0.70522), 207Pb/204Pb (15.511–15.610), 208Pb/204Pb (38.064–38.557) values a 143Nd/144Nd ratio (0.51271–0.51295). can be divided into upper, middle, lower volcanic rocks (UVR, MVR, LVR) on basis their stratigraphic level. MVR geochemically derived depleted mantle, whereas UVR LVR originated nondepleted enriched source contributions subducted Pacific plate fluid sediments. Use geothermobarometers indicates crystallization pressure for (6.25–11.19 kbar) significantly higher than (3.48–5.84 kbar). may low-degree (5%–10%) partial melting spinel lherzolite, while shallower degree (10%–20%) melting. addition, geochemical characteristics consistent younger age (13–17 Ma) composition an older (17–23 slightly LVR. Therefore, temporal changes old young subsequently associated progressive lithospheric extension thinning, well at least two episodes diverse asthenospheric upwelling pull-apart tectonic motion Yamato Basin.
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