Comparison of dynamic crystallization techniques on Apollo 15 quartz normative basaltsThe paper compares dynamic crystallization techniques used on Apollo 15 quartz normative basalts which show differences related to their method. The variation of pyroxene core major element chemistry with cooling rate is confirmed, and it is shown that the Fe loss from liquid is shifted toward the En-Di joint; it is suggested that the nucleation temperature and breakdown of equilibrium partitioning as a function of cooling rate dictate the core composition. It is concluded that the different crystallization behavior that results from the Fe-capsule and Fe-loop container methods is related to the nucleation kinetics.
Document ID
19800039407
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Lofgren, G. E. (NASA Johnson Space Center Geology Branch, Houston, Tex., United States)
Grove, T. L. (New York, State University Stony Brook, N.Y., United States)
Brown, R. W. (State Univ. of New York Stony Brook, NY, United States)
Smith, D. P. (Lockheed Electronics Co., Inc. Houston, Tex., United States)