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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Bibliographic Details
Main Authors: Planetary Processes, Hiroshi Takeda, A. Yamaguchi
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
Antarctic
The Antarctic
Antarc*
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
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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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