LOW-CALCIUM PIGEONITE IN NORTHWEST AFRICA AND ASUKA UREILITES WITH REFERENCE TO
Introduction: The pyroxene polymorphic pairs found in the Antarctic ureilites have been helping us to deduce their annealing temperatures and cooling histories [e.g., 1-3]. Coexisting orthopyroxene (Opx) and pigeonite (Pig) assemblages occur only in the magnesian group [3]. Low-Ca clinopyroxenes wit...
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Format: | Text |
Language: | English |
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Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.182.9829 http://www.lpi.usra.edu/meetings/metsoc2009/pdf/5117.pdf |
Summary: | Introduction: The pyroxene polymorphic pairs found in the Antarctic ureilites have been helping us to deduce their annealing temperatures and cooling histories [e.g., 1-3]. Coexisting orthopyroxene (Opx) and pigeonite (Pig) assemblages occur only in the magnesian group [3]. Low-Ca clinopyroxenes with a |
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