T284 Coordinated Microanalysis as a Tool for Increasing the Scientific Yield of Returned Planetary Materials

Wednesday, 7 November 2018
1:30 PM - 5:30 PM
Room 236-237

COORDINATED LABORATORY ANALYSIS OF COMETARY AND INTERSTELLAR MATERIALS: STARDUST AND BEYOND

Paper number: T284-8
Program: Technical Sessions
Time: 3:20 PM – 3:40 PM

Authors

Abstract

The NASA Stardust mission provided the planetary materials community with two milestone sample collections: particles from comet Wild 2, and particles from the contemporary interstellar dust stream. The Preliminary Examination periods for these collections ended in 2006 and 2014, respectively. Stardust samples are available to the international community for laboratory studies, and can be requested from the curators at NASA Johnson Space Center. Although new comet sample return and interstellar dust return missions are currently under development, mission timeline constraints mean that the Stardust collections will remain the only sources for cometary grains of known provenance and for contemporary interstellar dust over at least the next two decades. The Wild 2 sample collection provides opportunities to investigate diverse cometary components, ranging from refractory grains that represent the earliest solids formed in the Solar System to organic matter that comprises components necessary for the emergence of life on Earth. The interstellar collection provides the possibility of direct analysis of individual contemporary interstellar dust grains for testing the models used to interpret telescope and spacecraft-based measurements. As with all returned sample collections, the range of the scientific questions that can be addressed grows over time through improvements in the available laboratory instrumentation and methods. Recent advances in the scanning transmission electron microscopy, focused ion beam microscopy, and secondary ion mass spectrometry are especially critical to these studies, because they enable coordinated elemental, structural and isotopic measurements at micrometer to nanometer scales. We will present a summary of major results from these collections to-date, identify some of the outstanding questions, and discuss needs for instrumentation advances and new sample return collections.

Geological Society of America Abstracts with Programs. Vol. 50, No. 6

doi: 10.1130/abs/2018AM-322849

© Copyright 2018 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.