東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Oxygen Isotope Constraints on the Co...

Olson, Haley,

Linked to FindBook

Google Book

Amazon

博客來

Oxygen Isotope Constraints on the Composition of Seawater Through Time /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Oxygen Isotope Constraints on the Composition of Seawater Through Time // Haley Olson.
Author:	Olson, Haley,
Description:	1 electronic resource (232 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
Contained By:	Dissertations Abstracts International85-12B.
Subject:	Geochemistry. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31240171
ISBN:	9798382783154

Oxygen Isotope Constraints on the Composition of Seawater Through Time /
Olson, Haley,

Oxygen Isotope Constraints on the Composition of Seawater Through Time /Haley Olson. - 1 electronic resource (232 pages)

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

The chemical components of seawater are broadly set by weathering processes and exchange with the atmosphere. This means that the composition of the ocean reflects the contemporaneous climate state and tectonic setting. The deposition of minerals formed within the ocean represent the major long-term export of these chemical components and are thus a record of seawater chemistry through time. The chapters that follow examine the chemical sediment record across Earth history with a broad goal of constraining the evolution of the ocean-atmosphere system. We specifically focus on oxygen-bearing species that are robust to secondary alteration and thus have a greater chance of retaining primary information: sulfate (SO42-), zircon (ZrSiO4), and phosphate (PO43-).First, we explore the environmental information contained in sulfate minerals. We determine that the triple oxygen isotope composition of sulfate-bearing evaporite deposits is broadly representative of the marine sulfate reservoir, with some isotopic resetting due to processes that occur in the evaporite basin (Chapter 1, Appendix A). We use this framework for understanding evaporite basins to examine the oxygen isotope composition of the evaporite record over the last ~1,000 Ma (Appendix E). We identify a step-change in the triple oxygen isotope composition of evaporite basins at ~400 Ma, which we posit is the result of the evolution of root systems changing the locus of pyrite oxidation. The evaporite record does not extend back into the Archean, however, when sulfate concentrations were low. In fact, Archean sulfate was likely formed via distinct oxidation pathways compared to the evaporite record and can be a proxy for contemporaneous seawater. Accordingly, we use Archean barite (Chapter 2, Appendix B) and then the detrital zircon record (Chapter 3, Appendix C) to gain insight into the oxygen isotope composition of contemporaneous seawater. The most parsimonious explanation for these records is an early ocean with an oxygen isotope composition close to the modern. Finally, we explore the alteration history of carbonate fluorapatite, a carbonate and phosphate-bearing mineral, from the Permian Phosphoria Rock Complex (Chapter 4, Appendix D). Though this unit has been subject to significant diagenetic alteration, our multi-proxy approach is a promising framework for the future analysis of less-altered phosphorite units. Overall, these studies span geologic time (~4,400 Ma to 5.6 Ma) and use multiple proxies and analytical techniques to better understand the history of Earth's ocean-atmosphere system.

English

ISBN: 9798382783154Subjects--Topical Terms:

539092
Geochemistry.
Subjects--Index Terms:

Isotopes

Oxygen Isotope Constraints on the Composition of Seawater Through Time /
LDR:04036nmm a22004453i 4500 001 2433730
005 20250905091001.5
006 m o d
007 cr|nu||||||||
008 261011s2024 miu||||||m |||||||eng d
020 $a 9798382783154
035 $a (MiAaPQD)AAI31240171
035 $a AAI31240171
040 $a MiAaPQD $b eng $c MiAaPQD $e rda
100 1 $a Olson, Haley, $e author. $0 (orcid)0000-0001-9467-7132 $3 3823464
245 1 0 $a Oxygen Isotope Constraints on the Composition of Seawater Through Time / $c Haley Olson.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 1 electronic resource (232 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
500 $a Includes supplementary digital materials.
500 $a Advisors: Johnston, David T. Committee members: Pearson, Ann; Knoll, Andrew.
502 $b Ph.D. $c Harvard University $d 2024.
520 $a The chemical components of seawater are broadly set by weathering processes and exchange with the atmosphere. This means that the composition of the ocean reflects the contemporaneous climate state and tectonic setting. The deposition of minerals formed within the ocean represent the major long-term export of these chemical components and are thus a record of seawater chemistry through time. The chapters that follow examine the chemical sediment record across Earth history with a broad goal of constraining the evolution of the ocean-atmosphere system. We specifically focus on oxygen-bearing species that are robust to secondary alteration and thus have a greater chance of retaining primary information: sulfate (SO42-), zircon (ZrSiO4), and phosphate (PO43-).First, we explore the environmental information contained in sulfate minerals. We determine that the triple oxygen isotope composition of sulfate-bearing evaporite deposits is broadly representative of the marine sulfate reservoir, with some isotopic resetting due to processes that occur in the evaporite basin (Chapter 1, Appendix A). We use this framework for understanding evaporite basins to examine the oxygen isotope composition of the evaporite record over the last ~1,000 Ma (Appendix E). We identify a step-change in the triple oxygen isotope composition of evaporite basins at ~400 Ma, which we posit is the result of the evolution of root systems changing the locus of pyrite oxidation. The evaporite record does not extend back into the Archean, however, when sulfate concentrations were low. In fact, Archean sulfate was likely formed via distinct oxidation pathways compared to the evaporite record and can be a proxy for contemporaneous seawater. Accordingly, we use Archean barite (Chapter 2, Appendix B) and then the detrital zircon record (Chapter 3, Appendix C) to gain insight into the oxygen isotope composition of contemporaneous seawater. The most parsimonious explanation for these records is an early ocean with an oxygen isotope composition close to the modern. Finally, we explore the alteration history of carbonate fluorapatite, a carbonate and phosphate-bearing mineral, from the Permian Phosphoria Rock Complex (Chapter 4, Appendix D). Though this unit has been subject to significant diagenetic alteration, our multi-proxy approach is a promising framework for the future analysis of less-altered phosphorite units. Overall, these studies span geologic time (~4,400 Ma to 5.6 Ma) and use multiple proxies and analytical techniques to better understand the history of Earth's ocean-atmosphere system.
546 $a English
590 $a School code: 0084
650 4 $a Geochemistry. $3 539092
650 4 $a Analytical chemistry. $3 3168300
650 4 $a Geology. $3 516570
653 $a Isotopes
653 $a Paleoclimate
653 $a Phosphate
653 $a Sulfate
653 $a Zircon
690 $a 0996
690 $a 0486
690 $a 0372
710 2 $a Harvard University. $b Earth and Planetary Sciences. $e degree granting institution. $3 3823465
720 1 $a Johnston, David T. $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 85-12B.
790 $a 0084
791 $a Ph.D.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31240171