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GSA Annual Meeting in Denver, Colorado, USA - 2016

Paper No. 337-5
Presentation Time: 9:00 AM-6:30 PM

CHARACTERIZATION OF NANOPARTICLES IN EJECTA FALLOUT OF LONAR CRATER, INDIA


SIKDER, Arif M.1, MISRA, Saumitra2, LONDONO, Carlos E. Castano3, CLIFFORD, Dustin M.4, PESTOV, Dmitry3, KEILY, Elizabeth5, TURNER, Joseph B. McGee6 and GARMAN, Gregory C.7, (1)Center for Environmental Studies (CES), Virginia Commonwealth University (VCU), 1000 West Cary Street, Richmond, VA 23284, (2)Department of Geology, University of Kwazulu-Natal, Private Bag X54001, Durban, 4000, South Africa, (3)Nanomaterial Characterization Center (NCC), Virginia Commonwealth University (VCU), 620 West Cary Street, Richmond, VA 23284, (4)Virginia Commonwealth University (VCU), Nanomaterial Characterization Center (NCC), 620 West Cary Street, Richmond, VA 23284, (5)Department of Biology, Virginia Commonwealth University (VCU), 1000 West Cary Street, Richmond, VA 23284, (6)Virginia Commonwealth University (VCU), Department of Chemistry, 1001 West Main Street, Richmond, VA 23284, (7)Virginia Commonwealth University (VCU), Center for Environmental Studies (CES), 1000 West Cary Street, Richmond, VA 23284, amsikder@vcu.edu

Nanoparticles formed within the ejecta plume are thought to play an important role in the catastrophic events due to meteorite impacts. However, the mode of origin of these nanoparticles in the ejecta fallout is still not clearly known due to its poor preservation potential and alteration. To understand the development of the nano-phase in the ejecta fallout, isolated magnetic particles from the ejecta blanket of the Lonar Crater in India were analyzed using a transmission electron microscope (TEM) and a high sensitivity scanning electron microscope (SEM) equipped with energy dispersive spectrum analyzer (EDS). The studied particles were found as spatially segregated from each other and are comprised of both Fe-Ti oxide as determined by (electron energy loss spectroscopy (EELS) as well as Fe(1-x)Nix alloy as determined by selected area electron diffraction (SAED) with all nanoparticles having an average diameter (D) ≈3.6 nm. The presence of single domain crystalline nanoparticles in the ejecta fallout supports its formation due to vapor-solid condensation within the impact ejecta plume.

Session No. 337--Booth# 266

T165. Impact Cratering on Earth and throughout the Solar System (Posters)
Wednesday, 28 September 2016: 9:00 AM-6:30 PM
Exhibit Hall E/F (Colorado Convention Center)
Geological Society of America Abstracts with Programs. Vol. 48, No. 7
doi: 10.1130/abs/2016AM-286100
© Copyright 2016 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.
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