Samuel D. Crossley

Samuel D. Crossley
University of Arizona | UA · Department of Planetary Sciences

Doctor of Philosophy

About

11
Publications
588
Reads
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39
Citations
Additional affiliations
November 2021 - October 2023
Universities Space Research Association
Position
  • PostDoc Position
Description
  • Leading investigations into oxidized, sulfur-rich planetary differentiation through experimental petrology, geochemistry, and cross-disciplinary collaborations at LPI, NASA JSC, and University of Maryland.
Education
August 2016 - August 2021
August 2014 - July 2016
Texas Christian University
Field of study
  • Geology

Publications

Publications (11)
Article
Full-text available
This work greatly expands the application of multiphoton microscopy to geological investigations by using a tightly focused femtosecond laser beam to excite fluorescent emissions among minimally prepared rock and mineral samples. This novel finding provides a tool for spatially resolving UV-visible fluorescent sources in minerals. Through a combina...
Article
Full-text available
Direct mid-infrared signatures of silicate clouds in substellar atmospheres were first detected in Spitzer observations of brown dwarfs, although their existence was previously inferred from near-infrared spectra. With JWST’s Mid-Infrared Instrument, we can now more deeply probe silicate features from 8 to 10 μ m, exploring specific particle compos...
Preprint
Full-text available
We used a coordinated, interdisciplinary set of partial melting experiments to show that oxidized and sulfur-rich planetary bodies initiated core formation by partial melting and percolation of sulfides prior to silicate melting. We tested this mechanism by partially melting an equilibrated Rumuruti-type chondrite and collecting 3D images of the fo...
Article
Full-text available
Models of planetary core formation beginning with melting of Fe,Ni metal and troilite are not readily applicable to oxidized and sulfur-rich chondrites containing only trace quantities of metal. Cores formed in these bodies must be dominated by sulfides. Siderophile trace elements used to model metallic core formation could be used to model oxidize...
Article
Full-text available
Petrogenetic relationships among members of the brachinite family were established by analyzing major and trace element concentrations of minerals for 9 representative specimens: Al Huwaysah 010, Eagles Nest, Northwest Africa (NWA) 4882, NWA 5363, NWA 7297, NWA 7299, NWA 11756, Ramlat as Sahmah (RaS) 309, and Reid 013. The brachinite family, which...
Preprint
Full-text available
We greatly expand the application of multiphoton microscopy to geological investigations by using a tightly focused femtosecond laser beam to excite fluorescent emissions among minimally prepared rock and mineral samples. This new finding provides a tool for spatially resolving UV-visible fluorescent sources in minerals. Using a unique combination...
Preprint
Full-text available
Direct mid-infrared signatures of silicate clouds in substellar atmospheres were first detected in Spitzer observations of brown dwarfs, although their existence was previously inferred from near-infrared spectra. With the Mid-Infrared Instrument (MIRI) instrument on JWST, we can now more deeply probe silicate features from 8 to 10 microns, explori...
Conference Paper
https://www.hou.usra.edu/meetings/lpsc2023/pdf/1909.pdf
Article
Full-text available
The incompatible trace element‐enriched Stannern‐trend eucrites have long been recognized as requiring a distinct petrogenesis from the Main Group‐Nuevo Laredo (MGNL) eucrites. Barrat et al. (2007) proposed that Stannern‐trend eucrites formed via assimilation of crustal partial melts by a MGNL‐trend magma. Previous experimental studies of low‐degre...

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