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Evaluating the Application of Elemen...

Liu, Xinyi,

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Evaluating the Application of Elemental and Isotopic Ratios as Paleoredox Tracers in Earth's Oceans and Mars' Aqueous Alteration /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Evaluating the Application of Elemental and Isotopic Ratios as Paleoredox Tracers in Earth's Oceans and Mars' Aqueous Alteration // Xinyi Liu.
作者:	Liu, Xinyi,
面頁冊數:	1 electronic resource (182 pages)
附註:	Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
Contained By:	Dissertations Abstracts International85-12B.
標題:	Geochemistry. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31145492
ISBN:	9798382775401

Evaluating the Application of Elemental and Isotopic Ratios as Paleoredox Tracers in Earth's Oceans and Mars' Aqueous Alteration /
Liu, Xinyi,

Evaluating the Application of Elemental and Isotopic Ratios as Paleoredox Tracers in Earth's Oceans and Mars' Aqueous Alteration /Xinyi Liu. - 1 electronic resource (182 pages)

Source: Dissertations Abstracts International, Volume: 85-12, Section: B.

This dissertation critically evaluates the application of elemental and isotopic ratios as paleoredox tracers in early Earth's oceans and on early Mars' surface. It begins by questioning a common assumption in the field regarding the constancy of ocean mixing timescale throughout Earth's history and demonstrates with an Earth system model that the ocean mixing timescale has indeed only fluctuated between a few hundred and a couple of thousand years since the Archean. This foundational understanding informs subsequent analyses of neodymium (Nd) and uranium (U) isotopes as proxies for early oceanic conditions. Nd isotope modelling suggests that the heterogeneous Nd isotopic compositions recorded in Archean sedimentary archives primarily reflect continental and sedimentary influences, with a global Nd residence time on the order of the ocean mixing timescale in the Archean; a U mass balance model indicates a significantly reduced global U residence time in the anoxic Precambrian oceans compared to today, highlighting the importance of understanding the biogeochemical cycles of (redox sensitive) proxies in early oceans prior to the interpretation of sedimentary records.Extending beyond terrestrial environments, this dissertation explores the potential of iron-manganese and iron isotopic fractionations as tracers of redox conditions during aqueous alteration of mafic minerals on early Mars. Nuclear Resonant Inelastic X-ray Scattering (NRIXS) measurements of Martian clay analogs confirm a strong redox control on equilibrium iron isotopic fractionation during clay formation, and an iron oxidation kinetics-based alteration model exhibits good model-data correlation with paleosol records >1.85 Ga, promising a novel framework for inferring pedogenic redox conditions on Mars from future sample returns.

English

ISBN: 9798382775401Subjects--Topical Terms:

539092
Geochemistry.
Subjects--Index Terms:

Earth system model

Evaluating the Application of Elemental and Isotopic Ratios as Paleoredox Tracers in Earth's Oceans and Mars' Aqueous Alteration /
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520 $a This dissertation critically evaluates the application of elemental and isotopic ratios as paleoredox tracers in early Earth's oceans and on early Mars' surface. It begins by questioning a common assumption in the field regarding the constancy of ocean mixing timescale throughout Earth's history and demonstrates with an Earth system model that the ocean mixing timescale has indeed only fluctuated between a few hundred and a couple of thousand years since the Archean. This foundational understanding informs subsequent analyses of neodymium (Nd) and uranium (U) isotopes as proxies for early oceanic conditions. Nd isotope modelling suggests that the heterogeneous Nd isotopic compositions recorded in Archean sedimentary archives primarily reflect continental and sedimentary influences, with a global Nd residence time on the order of the ocean mixing timescale in the Archean; a U mass balance model indicates a significantly reduced global U residence time in the anoxic Precambrian oceans compared to today, highlighting the importance of understanding the biogeochemical cycles of (redox sensitive) proxies in early oceans prior to the interpretation of sedimentary records.Extending beyond terrestrial environments, this dissertation explores the potential of iron-manganese and iron isotopic fractionations as tracers of redox conditions during aqueous alteration of mafic minerals on early Mars. Nuclear Resonant Inelastic X-ray Scattering (NRIXS) measurements of Martian clay analogs confirm a strong redox control on equilibrium iron isotopic fractionation during clay formation, and an iron oxidation kinetics-based alteration model exhibits good model-data correlation with paleosol records >1.85 Ga, promising a novel framework for inferring pedogenic redox conditions on Mars from future sample returns.
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650 4 $a Aquatic sciences. $3 3174300
650 4 $a Biogeochemistry. $3 545717
653 $a Earth system model
653 $a Isotope geochemistry
653 $a Martian clay formation
653 $a Ocean mixing timescale
653 $a Paleoredox tracers
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690 $a 0425
690 $a 0792
710 2 $a The University of Chicago. $b Geophysical Sciences. $e degree granting institution. $3 3816833
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