Supratim Dey

Supratim Dey
University of California, Davis | UCD · Earth and Planetary Sciences

About

11
Publications
8,310
Reads
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60
Citations
Citations since 2016
10 Research Items
60 Citations
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Introduction
Supratim Dey is a Ph.D. pre-candidate in isotope cosmochemistry at the University of California, Davis. Supratim's research interest lies in studying planetary materials in order to unravel the clues to the origin and evolution of the Solar System. Supratim is specifically interested in studying early Solar System processes of planetary accretion and differentiation, using isotope cosmochemistry. Website: www.supratimdey.com Email: supratim@ucdavis.edu ORCID - orcid.org/0000-0002-1354-5304 ResearcherID - http://www.researcherid.com/rid/O-2435-2015
Additional affiliations
September 2017 - July 2022
University of California, Davis
Position
  • PhD Student
May 2016 - July 2016
University of Glasgow
Position
  • Research Intern
Description
  • Studied Helium isotopes in deep-sea cosmic spherules from the Indian Ocean seafloor, with an aim to quantify 3-He flux to sediments by cosmic spherules and effects of seawater alteration on Helium content.
May 2015 - July 2015
National Institute of Oceanography
Position
  • Research Intern
Description
  • "Evaluating changes in the elemental composition of micrometeorites during entry into the Earth’s atmosphere"
Education
September 2017 - June 2023
University of California, Davis
Field of study
  • Cosmochemistry
July 2012 - July 2017

Publications

Publications (11)
Conference Paper
Full-text available
Northwest Africa (NWA) 5480 is an olivine-rich diogenite (olivine-diogenite or harzburgite) with 57 vol.% and 42 vol.% olivine and orthopyroxene, respectively [10]. It is a pristine, low shock, unweathered rock. Its petrology and geochemistry has been studied in detail [10-15]. Preliminary paleointensity data shows that NWA 5480 preserves a strong...
Article
Full-text available
Most dust-sized cosmic particles undergo ablation and chemical alteration during atmospheric entry, which alters their original properties. A comprehensive understanding of this process is essential in order to decipher their pre-entry characteristics. The purpose of the study is to illustrate the process of vaporization of different elements for v...
Article
Full-text available
Antarctica micrometeorites (~1200) and cosmic spherules (~5000) from deep sea sediments are studied using electron microscopy to identify Mg-rich olivine grains in order to determine the nature of the particle precursors. Mg-rich olivine (FeO < 5wt%) in micrometeorites suffers insignificant chemical modification during its history and is a well-pre...
Article
Full-text available
We evaluate the heating of extraterrestrial particles entering the atmosphere using the comprehensive chemical ablation model (CABMOD). This model predicts the ablation rates of individual elements in a particle with a defined size, composition, entry velocity, and entry angle with respect to the zenith (ZA). In the present study, bulk chemical ana...
Preprint
Full-text available
The homogeneity of distribution of radioisotope ²⁶ Al in the early solar nebula, a major heat source for early planetary differentiation and foundational assumption to high resolution cosmochronology, remains debatable. Here we report a precise Pb-isotopic age of 4565.56±0.12 million years (Ma) for the recently discovered andesitic achondrite Erg C...
Article
Full-text available
Mantles of rocky planets are dominantly composed of olivine and its high-pressure polymorphs, according to seismic data of Earth’s interior, the mineralogy of natural samples, and modelling results. The missing mantle problem represents the paucity of olivine-rich material among meteorite samples and remote observation of asteroids, given how commo...
Preprint
Full-text available
The June 2, 2018, impact of asteroid 2018 LA over Botswana is only the second asteroid detected in space prior to impacting over land. Here, we report on the successful recovery of meteorites. Additional astrometric data refine the approach orbit and define the spin period and shape of the asteroid. Video observations of the fireball constrain the...
Article
The June 2, 2018 impact of asteroid 2018 LA over Botswana is only the second asteroid detected in space prior to impacting over land. Here, we report on the successful recovery of meteorites. Additional astrometric data refine the approach orbit and define the spin period and shape of the asteroid. Video observations of the fireball constrain the a...

Questions

Questions (3)
Question
Is the difference based on chemical composition, texture or origin?
Question
The bulk chemical composition of a meteoroid can change because of the rapid heating it experiences during atmospheric entry. Besides a relatively small loss of matter through sputtering with air molecules, the particleʼs temperature may
reach its melting point and then lose a much larger fraction of mass through evaporation (Rudraswami et al, 2015). How is the initial composition of the precursor determined from the final composition of the micrometeorite sample?
Question
I am a beginner, so I do not know about the existing procedures for converting chemical composition from EPMA to identify the mineral. I would like to know the general procedure followed. 
I am working on EPMA data of micrometeorites and have several points of data for each sample, along with BSE images. I am interested in identifying which minerals are present in each sample, which are generally Olivine or Pyroxene. However, due to the wide range of compositions of both Olivine and Pyroxene, with a significantly overlapping composition ranges of Fe, Mg, and Si, I am unsure about how to definitely identify the mineral.

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