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Trace Element Abundances of Olivine-Hosted Melt Inclusions in Shergottites Northwest Africa 7397 and Robert Massif 04262Olivine-hosted melt inclusions (MIs) may retain trapped parent magma compositions as well as record progressive differentiation while magmas crystallize and ascend towards the surface [1,2 and references therein]. Major element compositions of the MIs, especially Fe and Mg, can be affected by post-entrapment re-equilibration with their host olivine [1,2]. Therefore, Fe/Mg ratio correction is required to obtain MI bulk compositions following equilibrium with their host olivine. Partition coefficients of most of the trace elements in olivine are very low (i.e. DOL/melt<0.001). Thus, ratios of trace elements of olivine-hosted MIs are unlikely to be affected by post-entrapment re-equilibration and no correction is necessary [2]. Hence, tracking trace element behavior in MIs may constrain the composition of the parent magma and its evolution yielding insights on magma differentiation of shergottites. However, analyzing MIs for chemical compositions is a challenging task due to their low abundances and small sizes. Using a highly sensitive and precise micro-beam technique is essential to examine olivine-hosted MIs in order to measure trace element abundances. For this purpose, laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is an excellent tool due to its wide range of laser spot sizes (1-150 μm), ability to obtain raster analysis (several mm2) and lower detection limits (0.1 ppb) [3].
Document ID
20190001739
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Ferdous, J. (Houston Univ. Houston, TX, United States)
Brandon, A. D. (Houston Univ. Houston, TX, United States)
Humayun, M. (Florida State Univ. Tallahassee, FL, United States)
Peslier, A. H. (Jacobs Technology, Inc. Houston, TX, United States)
Date Acquired
March 21, 2019
Publication Date
March 19, 2019
Subject Category
Lunar And Planetary Science And Exploration
Report/Patent Number
JSC-E-DAA-TN64818
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: Woodlands, TX
Country: United States
Start Date: March 18, 2019
End Date: March 22, 2019
Sponsors: Lunar and Planetary Institute (LPI)
Funding Number(s)
CONTRACT_GRANT: NNJ13HA01C
Distribution Limits
Public
Copyright
Public Use Permitted.

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