Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
American Mineralogist RIMG advertisement
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
American Mineralogist; June 1999; v. 84; no. 5-6; p. 821-837
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Jolliff, B. L.
Right arrow Articles by Schwartz, J. M.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Geochemistry, petrology, and cooling history of 14161,7373; a plutonic lunar sample with textural evidence of granitic-fraction separation by silicate-liquid immiscibility

B. L. Jolliff, C. Floss, I. S. McCallum, and J. M. Schwartz

Washington University, Department of Earth and Planetary Sciences and the McDonnell Center for the Space Sciences, Saint Louis, MO, United States

We report new findings related to sample 14161,7373, the first analyzed lunar intrusive rock to show textural evidence for the formation of granitic material by silicate liquid immiscibility (SLI) and geochemical evidence for separation of that material, at least on a small scale, from mafic residua. Ion microprobe analyses of rare-earth element (REE) concentrations in silicates record the compositional evolution of this late-stage assemblage. For a sample whose bulk assemblage, that of whitlockite monzogabbro, has REE concentrations at approximately 5-6XKREEP levels, the silicates have only moderately high REE concentrations. The calculated REE concentrations of melt in equilibrium with pigeonite, after re-integration of pigeonite host and augite lamellae, is approximately 2Xhigh-K KREEP. The high bulk REE concentrations of the assemblage are the result of a high proportion of whitlockite, probably an excess, i.e., the assemblage is a whitlockite cumulate. Variations in silicate REE concentrations reflect the co-crystallization of whitlockite, which we interpret to have begun crystallizing prior to the onset of late-stage immiscibility of the felsic melt fraction. Calculated cooling rates, based on a quantitative model of pyroxene exsolution, reveal a two-stage thermal history, which involved initial crystallization at a minimum depth of 700-800 m during which the primary augite and pigeonite grains unmixed to form the observed host-lamella pairs. Unusual compositional profiles close to the host-lamella interface are consistent with a second stage of mild reheating followed by rapid cooling at a depth of approximately 30 m, most likely in an ejecta blanket. The shallow depth of origin indicated for 14161,7373 is consistent with other studies of evolved lunar intrusive rocks, supporting the interpretation that lunar QMD and granite, as found among the Apollo samples, are late-stage differentiates of high-level intrusions and are not related to differentiation of deep crustal KREEP reservoirs.

This record provided courtesy of AGI/GeoRef.




This article has been cited by other articles:


Home page
 American MineralogistHome page
B. L. Jolliff, J. M. Hughes, J. J. Freeman, and R. A. Zeigler
Crystal chemistry of lunar merrillite and comparison to other meteoritic and planetary suites of whitlockite and merrillite
American Mineralogist, October 1, 2006; 91(10): 1583 - 1595.
[Abstract] [Full Text] [PDF]

Home page
 Reviews in Mineralogy and GeochemistryHome page
P. Lucey, R. L. Korotev, J. J. Gillis, L. A. Taylor, D. Lawrence, B. A. Campbell, R. Elphic, B. Feldman, L. L. Hood, D. Hunten, et al.
Understanding the Lunar Surface and Space-Moon Interactions
Reviews in Mineralogy and Geochemistry, January 1, 2006; 60(1): 83 - 219.
[Full Text] [PDF]

Home page
 Reviews in Mineralogy and GeochemistryHome page
M. A. Wieczorek, B. L. Jolliff, A. Khan, M. E. Pritchard, B. P. Weiss, J. G. Williams, L. L. Hood, K. Righter, C. R. Neal, C. K. Shearer, et al.
The Constitution and Structure of the Lunar Interior
Reviews in Mineralogy and Geochemistry, January 1, 2006; 60(1): 221 - 364.
[Full Text] [PDF]

Home page
 Reviews in Mineralogy and GeochemistryHome page
C. K. Shearer, P. C. Hess, M. A. Wieczorek, M. E. Pritchard, E. M. Parmentier, L. E. Borg, J. Longhi, L. T. Elkins-Tanton, C. R. Neal, I. Antonenko, et al.
Thermal and Magmatic Evolution of the Moon
Reviews in Mineralogy and Geochemistry, January 1, 2006; 60(1): 365 - 518.
[Full Text] [PDF]

Home page
 Can MineralHome page
D. J. Kontak, M. Y. De Wolfe De Young, and J. Dostal
LATE-STAGE CRYSTALLIZATION HISTORY OF THE JURASSIC NORTH MOUNTAIN BASALT, NOVA SCOTIA, CANADA. I. TEXTURAL AND CHEMICAL EVIDENCE FOR PERVASIVE DEVELOPMENT OF SILICATE-LIQUID IMMISCIBILITY
Can Mineral, October 1, 2002; 40(5): 1287 - 1311.
[Abstract] [Full Text] [PDF]

Home page
 American MineralogistHome page
A. Wang, B. L. Jolliff, L. A. Haskin, K. E. Kuebler, and K. M. Viskupic
Characterization and comparison of structural and compositional features of planetary quadrilateral pyroxenes by Raman spectroscopy
American Mineralogist, July 1, 2001; 86(7-8): 790 - 806.
[Abstract] [Full Text] [PDF]


JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2009 by Mineralogical Society of America