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Revisiting U-Pb and ²⁶Al-²⁶Mg Systematics of Calcium Aluminum-Rich Inclusions: Applications on Early Solar System Chronology and Evolution History

Citation

Li, Haoyu (2024) Revisiting U-Pb and ²⁶Al-²⁶Mg Systematics of Calcium Aluminum-Rich Inclusions: Applications on Early Solar System Chronology and Evolution History. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/ahbv-8z61. https://resolver.caltech.edu/CaltechTHESIS:05202024-220724726

Abstract

Stable isotope systematics are powerful tools for understanding the evolution history of the earth and Solar system. In this thesis, I present applications of uranium (U) and magnesium (Mg) isotopes in both geochemistry and cosmochemistry.

Uranium is a redox-sensitive to the dissolved oxygen level in aqueous environment, and these redox reactions are associated with resolvable isotopic fractionation. Thus, U isotopes are widely used in paleo-environment reconstruction as a proxy of marine anoxia. For this application, the work presented in this thesis includes (1) exploration of the potential of bioapatite as a novel paleoredox proxy. and (2) re-calibrate the U isotope composition of seawater. The U-Pb and Al-Mg systematics provide constraints on the time sequence and composition of the early Solar System. For this application, the work presented in this thesis includes (1) combined Pb-Pb and Al-Mg systematics on calcium-aluminum-rich inclusions (CAIs) to resolve the discrepancies between these two chronometers (2) Al-Mg systematics of bulk CAIs to understand their precursors. This thesis also presents the analytical techniques developed for the studies above and the development of a comprehensive uranium isotope database.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:uranium isotopes, magnesium isotope, paleoredox, early Solar System
Degree Grantor:California Institute of Technology
Division:Geological and Planetary Sciences
Major Option:Geochemistry
Thesis Availability:Restricted to Caltech community only
Research Advisor(s):
  • Tissot, François L.H.
Thesis Committee:
  • Eiler, John M. (chair)
  • Fischer, Woodward W.
  • Amelin, Yuri
  • Krot, Alexander N.
  • Tissot, François L. H.
Defense Date:16 May 2024
Funders:
Funding AgencyGrant Number
NASA80NSSC20K1398
NSFMGG-2054892
Packard FoundationUNSPECIFIED
Center for Evolutionary ScienceUNSPECIFIED
Record Number:CaltechTHESIS:05202024-220724726
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:05202024-220724726
DOI:10.7907/ahbv-8z61
Related URLs:
URLURL TypeDescription
https://doi.org/10.1021/acsearthspacechem.0c00273DOIArticle adapted for ch. 2: Distribution Coefficients of the REEs, Sr, Y, Ba, Th, and U between α-HIBA and AG50W-X8 Resin
https://doi.org/10.1016/j.gca.2023.11.034DOIArticle adapted for ch. 2 and 4: Exploring uranium isotopes in shark teeth as a paleo-redox proxy
https://doi.org/10.1016/j.gca.2022.09.018DOIArticle adapted for ch. 2 and 4: 238U, 235U and 234U in seawater and deep-sea corals: A high-precision reappraisal
https://doi.org/10.1016/j.chemgeo.2022.121221DOIArticle adapted for ch. 3: UID: The uranium isotope database
ORCID:
AuthorORCID
Li, Haoyu000-0002-7192-2470
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16402
Collection:CaltechTHESIS
Deposited By: Haoyu Li
Deposited On:04 Jun 2024 20:32
Last Modified:04 Jun 2024 20:32

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