Petrogenesis of KREEP Basalts

Doctoral Dissertation

Abstract

KREEP basalts are an oddity. Their trace element signature is evolved, possessing an abundance of incompatible trace elements (KREEP: K, Rare Earth Elements and Phosphorus), and yet they are primitive with regards to their major element composition. A great deal of effort has been spent on understanding how these basalts formed, whether they were impact melts mixing a KREEP-rich lithology with a Mg-rich one. Or as endogenous melts of the lunar interior, owing there KREEPy REE’s to their source, or perhaps to contamination as they travelled to the lunar surface passing through a KREEPy lithology. Based on a combination of crystal size distributions (a quantitative petrographic method), in situ major and trace element analysis, and element mapping, the KREEP basalts were studied. In chapters 2 and 3, I develop and refine methods on two KREEP basalts, one endogenous and one impact. Chapter 4 records the CSD’s that were produced to determine their origin. Chapter 5 combines the data from chapters 2 and 3 and synthesizing these with the major and trace element compositions and calculated equilibrium liquids of pyroxene and plagioclase from additional KREEP basalts.

Attributes

Attribute NameValues
Author Karl Cronberger
Contributor Melissa Berke , Committee Member
Contributor Antonio Simonetti, Committee Member
Contributor Peter C Burns , Committee Member
Contributor Clive R. Neal, Research Director
Degree Level Doctoral Dissertation
Degree Discipline Civil and Environmental Engineering and Earth Sciences
Degree Name Doctor of Philosophy
Banner Code
  • PHD-CEGS

Defense Date
  • 2019-05-20

Submission Date 2019-07-03
Record Visibility and Access Public
Content License
Departments and Units
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