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

Fig. 3

From: Formation of lower fast-spread oceanic crust: a structural and geochemical study of troctolites in the Hess Deep Rift (East Pacific Rise)

Fig. 3

Thin section images, photomicrographs, and back-scattered electron images of troctolites from IODP Site U1415. a, g were taken with plane-polarized light, and b, e, f, i were taken with cross-polarized light. c, d, h were taken by EPMA. a Coarse-grained troctolite (CGT11). The red square is magnified in b. The positions of chromian spinel grains shown in c, d are pointed by the red arrows. b Interstitial clinopyroxene along grain boundaries of olivine and plagioclase in CGT11. c, d Anhedral and subhedral chromian spinels in CGT11. e Interstitial clinopyroxenes in the clinopyroxene-rich coarse-grained troctolite (CGT9). f Fine (~ 0.5 mm in long length) olivine grains in the fine-grained troctolite (FGT8). g Centimeter-sized clinopyroxene oikocrysts embedded in fine-grained troctolite (FGT10). The red square is magnified in h. h Partially serpentinized olivine grains rimed with orthopyroxene. i Coarse (~ 5 mm in long length) olivine grains exhibit skeletal morphology in the skeletal olivine-bearing troctolite (SOBT1). Clinopyroxenes are interstitial along grain boundaries of olivine and plagioclase, and share the same crystallographic orientation. Cpx Clinopyroxene, Cr-spl Chromian spinel, Ol Olivine, Opx Orthopyroxene, Pl Plagioclase

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