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Progress in Earth and Planetary Science
Fig. 3 | Progress in Earth and Planetary Science

Fig. 3

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. 3

Petrography of rock samples from Mado Megamullion. a Granular brown amphibole in YK18-07-6K-1515-R8 dolerite. b Coarse-grained YK18-07-6K-1515-R14 oxide gabbro. The white squares show analytical area by EPMA in Fig. 4. c Interstitial brown amphibole and orthopyroxene in YK19-04S-6K-1536-R18 olivine gabbro. d Interstitial brown amphibole overprinted by green amphibole in YK19-04S-6K-1536-R18 olivine gabbro. e A contact between porphyroclastic YK19-04S-6K-1536-R14B-1 olivine gabbro and mylonitic YK19-04S-6K-1536-R14B-2 olivine gabbro. f Varitextured YK18-2-D05-R101-a olivine gabbro. g Anhedral massive chromian spinel in KH-18-02-D12-R32b dunite. h Vermicular chromian spinel in bastite pseudomorph after orthopyroxene in KH-18-02-D12-R2 peridotite. i Network-like vein in YK19-04S-6K-1536-R12A peridotite. The white square represents the area of k. j Partial replacement of orthopyroxene by pale brown amphibole and talc close to network-like vein in YK18-07-6K-1515-R6 peridotite. k Overgrowth of green amphibole on brown amphibole in network-like vein in YK19-04S-6K-1536-R12A peridotite. l Kinked orthopyroxene porphyroclast exhibiting undulose extinction with neoblasts in YK18-07-6K-1515-R3 peridotite. a, f, h, i and l were taken under crossed-polarized light. b, c, d, e, g and k were taken under plane-polarized light. j is COMP image taken by EPMA. Abbreviations: Amp = amphibole, Ba = bastite, Chl = chlorite, Cpx = clinopyroxene, Dol = dolerite, Du = dunite, Ga = gabbro, Ol = olivine, Ol ga = olivine gabbro, Opx = orthopyroxene, Ox ga = oxide gabbro, Pe = peridotite, Pl = plagioclase, Pm = pseudomorph, Ser = serpentine, Spl = chromian spinel, and Tlc = talc

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