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Global- and Local-Scale Environmental Change in an Ancient High-Elevation Lake Basin; Carbonates and Microbialites From the Latest Cretaceous to Middle Eocene Sheep Pass Formation, Nevada, USA
Global- and Local-Scale Environmental Change in an Ancient High-Elevation Lake Basin; Carbonates and Microbialites From the Latest Cretaceous to Middle Eocene Sheep Pass Formation, Nevada, USA
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103121
- ISBN
- 9798315729709
- DDC
- 551.6
- 서명/저자
- Global- and Local-Scale Environmental Change in an Ancient High-Elevation Lake Basin; Carbonates and Microbialites From the Latest Cretaceous to Middle Eocene Sheep Pass Formation, Nevada, USA
- 발행사항
- [Sl] : University of Colorado at Boulder, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 275 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
- 주기사항
- Advisor: Snell, Kathryn;Trower, Elizabeth.
- 학위논문주기
- Thesis (Ph.D.)--University of Colorado at Boulder, 2025.
- 초록/해제
- 요약The Sheep Pass Formation type section in east-central Nevada preserves lacustrine (lake), palustrine (wetland), and microbialite carbonates deposited within a high-elevation lake basin between the latest Cretaceous and middle Eocene. This interval spans a pivotal time in geologic history; it encompasses the Cretaceous-Paleogene (K-Pg) mass extinction, as well as long-term greenhouse conditions and rapid warming events that serve as some of our best analogs for future climate change under un-mitigated anthropogenic warming. Understanding terrestrial records from this time contributes an invaluable perspective beyond the better-constrained marine realm. However, continental settings are complex and variable, requiring a diverse range of paleoenvironmental proxies and settings to holistically describe this climate response on land. Characterizing the carbonate sedimentology and stable isotope geochemistry of the Sheep Pass Formation type section has the potential to provide a nuanced record of environmental change in a high-elevation setting during this crucial past climate interval. My dissertation work combines transmitted light and cathodoluminescence petrography, X-ray diffraction mineralogy, and various stable isotope geochemistry tools (δ13C, δ18O, and Δ47) to describe the paleoenvironmental trends preserved in the Sheep Pass Basin. I find that the Sheep Pass Formation type section preserves a dynamic and sensitive lake basin due to its small size, with evidence that microbialites - lithified microbial mats - thrived in place of a more complex metazoan food web. I also find sedimentological and geochemical evidence for the potential expression of both long-term and short-term global climate signals, including warming from the late Paleocene to early Eocene, as well as abrupt climate transitions like the K-Pg boundary and early Paleogene hyperthermal climate events. Lastly, carbonate microbialites from the Sheep Pass Formation type section preserve geochemical evidence for local-scale photosynthetic carbon cycling, similar to both modern and modeled observations. In full, this work highlights that the careful characterization of ancient carbonates from the Sheep Pass Formation type section reveals a new and unique record of global- and local-scale environmental change during an important geologic climate interval.
- 일반주제명
- Paleoclimate science
- 일반주제명
- Sedimentary geology
- 일반주제명
- Geochemistry
- 키워드
- Clumped isotopes
- 키워드
- Lacustrine
- 키워드
- Microbialites
- 키워드
- Western USA
- 기타저자
- University of Colorado at Boulder Geology
- 기본자료저록
- Dissertations Abstracts International. 86-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202103121
■006m o d
■007cr#unu||||||||
■020 ▼a9798315729709
■035 ▼a(MiAaPQ)AAI31938097
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a551.6
■1001 ▼aOlsen-Valdez, Juliana.▼0(orcid)0009-0000-0092-9707
■24510▼aGlobal- and Local-Scale Environmental Change in an Ancient High-Elevation Lake Basin; Carbonates and Microbialites From the Latest Cretaceous to Middle Eocene Sheep Pass Formation, Nevada, USA
■260 ▼a[Sl]▼bUniversity of Colorado at Boulder▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a275 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-11, Section: B.
■500 ▼aAdvisor: Snell, Kathryn;Trower, Elizabeth.
■5021 ▼aThesis (Ph.D.)--University of Colorado at Boulder, 2025.
■520 ▼aThe Sheep Pass Formation type section in east-central Nevada preserves lacustrine (lake), palustrine (wetland), and microbialite carbonates deposited within a high-elevation lake basin between the latest Cretaceous and middle Eocene. This interval spans a pivotal time in geologic history; it encompasses the Cretaceous-Paleogene (K-Pg) mass extinction, as well as long-term greenhouse conditions and rapid warming events that serve as some of our best analogs for future climate change under un-mitigated anthropogenic warming. Understanding terrestrial records from this time contributes an invaluable perspective beyond the better-constrained marine realm. However, continental settings are complex and variable, requiring a diverse range of paleoenvironmental proxies and settings to holistically describe this climate response on land. Characterizing the carbonate sedimentology and stable isotope geochemistry of the Sheep Pass Formation type section has the potential to provide a nuanced record of environmental change in a high-elevation setting during this crucial past climate interval. My dissertation work combines transmitted light and cathodoluminescence petrography, X-ray diffraction mineralogy, and various stable isotope geochemistry tools (δ13C, δ18O, and Δ47) to describe the paleoenvironmental trends preserved in the Sheep Pass Basin. I find that the Sheep Pass Formation type section preserves a dynamic and sensitive lake basin due to its small size, with evidence that microbialites - lithified microbial mats - thrived in place of a more complex metazoan food web. I also find sedimentological and geochemical evidence for the potential expression of both long-term and short-term global climate signals, including warming from the late Paleocene to early Eocene, as well as abrupt climate transitions like the K-Pg boundary and early Paleogene hyperthermal climate events. Lastly, carbonate microbialites from the Sheep Pass Formation type section preserve geochemical evidence for local-scale photosynthetic carbon cycling, similar to both modern and modeled observations. In full, this work highlights that the careful characterization of ancient carbonates from the Sheep Pass Formation type section reveals a new and unique record of global- and local-scale environmental change during an important geologic climate interval.
■590 ▼aSchool code: 0051.
■650 4▼aPaleoclimate science
■650 4▼aSedimentary geology
■650 4▼aGeochemistry
■653 ▼aCarbonate sedimentology
■653 ▼aClumped isotopes
■653 ▼aLacustrine
■653 ▼aMicrobialites
■653 ▼aStable isotope geochemistry
■653 ▼aWestern USA
■690 ▼a0653
■690 ▼a0594
■690 ▼a0996
■71020▼aUniversity of Colorado at Boulder▼bGeology.
■7730 ▼tDissertations Abstracts International▼g86-11B.
■790 ▼a0051
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357044▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
