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Progress in Earth and Planetary Science
Fig. 10 | Progress in Earth and Planetary Science

Fig. 10

From: Geochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of Shikoku Basin: an example of Mado Megamullion

Fig. 10

In-situ Pb isotope data of magmatic brown amphibole in YK18-07-6K-1515-R14 oxide gabbro. The inset represents a simplified model of mantle contamination by the input of slab component with the positions of Kian Seamount Chain (KSC), East Shikoku Basin Seamount (ESBS), Kinan Escarpment (KE), and Back-arc Seamount Chain (BASC) relative to the Shikoku Basin (SB) spreading center and arc front. The pale blue arrow denotes a compositional change by the input of slab component. Measured variability (1SD) is smaller than each symbol size. Pb isotope data of KSC basalts, ESBS basalts, KE basalts, and BASC basalts are from Ishizuka et al. (2009); those of seawaters are from Ling et al. (1997); and those of marine sediments are from Plank and Langmuir (1998). MORB data field is after Stracke et al. (2005). The values of 207Pb/206Pb in depleted MORB mantle (DMM, a hypothetical source reservoir to MORB) were taken from Workman and Hart (2005). D-DMM and E-DMM represent depleted DMM and enriched DMM, respectively (Workman and Hart, 2005)

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