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. Author manuscript; available in PMC: 2019 Mar 1.
Published in final edited form as: Geochim Cosmochim Acta. 2017 Dec 16;224:116–131. doi: 10.1016/j.gca.2017.12.013

Figure 1:

Figure 1:

Representative BSE images of chondrules from the Kaba USNM 1052–1 thin section showing SIMS pits for oxygen three-isotope analyses (except for K1). (a) compound chondrule K8+9 (IAB) enclosed in igneous rim comprising pyroxene, olivine and opaque phases. (b) K1 (IAB) composed of coarse-grained olivine and pyroxene phenocrysts, as well as anorthite and high-Ca pyroxene in mesostasis at the chondrule center; enclosed in relatively fine-grained and opaque phases-rich rim. (c) K22 (IAB) contains coarse-grained olivine and low-Ca pyroxene. Altered mesostasis comprises phyllosilicates and high-Ca pyroxenes, latter forming euhedral overgrowths on low-Ca pyroxenes. (d) low-Ca pyroxene poikilically encloses olivine in K11 (IB). (e) K16 (IA) comprises small amount of mesostasis and intermediate pyroxene alongside olivine. (f) FeO-rich low-Ca pyroxenes (En85) in K25 (IIB) possess overgrowth of FeO-rich olivine (Fo83). Ol: olivine, Lpx: low-Ca pyroxene, HPx: high-Ca pyroxene, IntPx: intermediate pyroxene, An: anorthite, Phy: phyllosilicates; scale in all images: 500μm.