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Title
Isotopic investigations of meteoritic materials: from earliest-formed solids to planetary bodies
Description
The beginning of our Solar System, including events such as the formation of the first solids as well as the accretion and differentiation of planetary bodies, is recorded in meteoritic material. This record can be deciphered using petrographic, geochemical and isotopic investigations of different classes of meteorites and their components. In this dissertation, I have investigated a variety of isotope systematics in chondritic and achondritic meteorites to understand processes that have shaped our Solar System. Specifically, the investigations conducted here are in two main areas: 1) Hydrogen isotope systematics in a meteorite representing the freshest known sample of the martian crust, and 2) Isotopic studies (specifically relating to high resolution chronology, nucleosynthetic anomalies and mass-dependent fractionations) in calcium-aluminum-rich inclusions, which are thought to be the earliest-formed solids in the Solar System. Chapter 1 of this dissertation presents a review of the hydrogen isotopic compositions of various planetary bodies and reservoirs in the Solar System, which could serve as tracers for the volatile sources. Chapter 2 focuses on an investigation of the hydrogen isotopic systematics in the freshest martian meteorite fall, Tissint, using the Cameca IMS-6f secondary ion mass spectrometer (SIMS). These first two chapters comprise the first part of this dissertation. The second part is comprised of chapters 3 through 6 and is focused on isotopic analyses of Calcium-Aluminum-rich Inclusions (CAIs). Chapter 3 is a review of CAIs, which record some of the earliest processes that occurred in the solar nebula. Chapter 4 presents the results of an investigation of the 26Al-26Mg short-lived chronometer (half-life ~0.72 Ma) in two CAIs and their Wark-Lovering (WL) rims from a CV3 carbonaceous chondrite using the Cameca NanoSIMS 50L. Chapter 5 is focused on the results of a study of the Zr isotope compositions of a suite of 15 CAIs from different carbonaceous chondrites using multicollector inductively coupled plasma mass spectrometry (MC-ICPMS), in order to identify nucleosynthetic anomalies in the CAI-forming region. Chapter 6 focuses on the mass-dependent Mg isotopic compositions measured in 11 CAIs from the Allende CV3 carbonaceous chondrite using MC-ICPMS, to evaluate effects of thermal processing on CAIs.
Date Created
2016
Contributors
- Mane, Prajkta (Author)
- Wadhwa, Meenakshi (Thesis advisor)
- Hervig, Richard (Committee member)
- Desch, Steven (Committee member)
- Garvie, Laurence (Committee member)
- Bell, James (Committee member)
- Arizona State University (Publisher)
Topical Subject
Resource Type
Extent
x, 154 pages : illustrations (chiefly color)
Language
eng
Copyright Statement
In Copyright
Primary Member of
Peer-reviewed
No
Open Access
No
Handle
https://hdl.handle.net/2286/R.I.41284
Statement of Responsibility
by Prajkta Mane
Description Source
Retrieved on July 10, 2017
Level of coding
full
Note
thesis
Partial requirement for: Ph.D., Arizona State University, 2016
bibliography
Includes bibliographical references (pages 134-154)
Field of study: Geological sciences
System Created
- 2017-02-01 07:03:21
System Modified
- 2021-08-30 01:19:53
- 3 years 2 months ago
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