서브메뉴
검색
상세정보
Planktic Foraminifera Extinctions and Delayed Biotic Recovery in the Late Maastrichtian-Early Danian: Link to Global Environmental Catastrophes?- [electronic resource]
Planktic Foraminifera Extinctions and Delayed Biotic Recovery in the Late Maastrichtian-Early Danian: Link to Global Environmental Catastrophes?- [electronic resource]
상세정보
- 자료유형
- 학위논문(국외)
- 자관 청구기호
- 기본표목-개인명
- 표제와 책임표시사항
- Planktic Foraminifera Extinctions and Delayed Biotic Recovery in the Late Maastrichtian-Early Danian: Link to Global Environmental Catastrophes? - [electronic resource] / Punekar, Jahnavi.
- 발행, 배포, 간사 사항
- 형태사항
- 1 online resource(227 p)
- 일반주기
- Source: Dissertation Abstracts International, Volume: 77-07(E), Section: B.
- 일반주기
- Adviser: Gerta Keller.
- 학위논문주기
- Thesis (Ph.D.)--Princeton University, 2016.
- 요약 등 주기
- 요약The final ~3 myr of the Maastrichtian (Late Cretaceous) and the first ~2 myr of the Danian (Early Paleogene) showcase multiple climate shifts, major sea level fluctuations and significant faunal turnovers that are unique in geologic history. This interval (69.0-64.0 Ma) brackets the controversial Cretaceous-Tertiary boundary (KTB or K-Pg) mass extinction and two prominent global catastrophes: the Chicxulub impact and Deccan volcanism. The immediate cause for the KTB mass extinction, whether impact or volcanism, has remained controversial for the past 35 years. The main objective of this thesis is to bring some clarity to this controversial mass extinction, and to understand and isolate the contributions of each event to the long-term evolution, diversification and extinction trends recorded by planktic foraminiferal assemblages.
- 요약 등 주기
- 요약In the past decade, three major phases of Deccan volcanism have been identified based on 40Ar/39Ar and magnetostratigraphy: phase-1 spanning the paleomagnetic chron C30r/C30n boundary (planktic foraminiferal zone CF4), phase-2 in the latest Maastrichtian C29r (zones CF1--CF2), and phase-3 in the early Danian C29n (P1b). Our results show that planktic foraminifera assemblages from the palaeo-Tethyean Egypt and Sinai record high-stress assemblages dominated by opportunist species Guembelitria tentatively coeval with each of the three volcanic phases. Guembelitria acme events correlative with phase-1 volcanism are relatively minor (80% of the total assemblage) are observed in CF1 spanning the last ~100 kyr of the Cretaceous, also correlative with abrupt climate warming and phase-2 Deccan volcanism. High-stress (50-- 75% Guembelitria) is also observed in zone P1b, marked by another climate warming (Dan- C2 event) and a major negative carbon isotope excursion correlative with phase-3 volcanism.
- 요약 등 주기
- 요약Our review of the entire KTB database (~300 sites worldwide) in context of the latest available dates for Deccan volcanism confirmed time-correlation of faunal high-stress events with the last two major phases of Deccan volcanism worldwide. The major phase-2 is invariably associated with blooms of the opportunist Guembelitria in shallow-marine assemblages from India through the Tethys to the Atlantic Ocean. Similar high-stress environments dominated by opportunist blooms are observed globally correlative with phase- 3 volcanism in the Danian zone P1b. Biotic recovery is observed in Danian zone P1c, only after phase-3 volcanism ended. Deccan volcanism can therefore account for the end- Maastrichtian high-stress that ended in the mass extinction, and the ~500 kyr delay in marine recovery, respectively.
- 요약 등 주기
- 요약The cumulative loading of 10's of thousands of Gigatons (Gt) of volcanogenic CO2 into the end-Cretaceous atmosphere within 10's of thousand years would increase the atmospheric pCO2 on timescales that are recorded in the sediments. The potential acidification of oceans could have critically contributed to high environmental stress for marine calcifying organisms. Our study of the pre-KTB sediments from Bidart and Gamsbach show a concurrence of low magnetic susceptibility and high foraminifera test fragmentation index (FI), collectively forming the first-ever definitive evidence for ocean acidification linked to Deccan volcanism. We propose this carbonate crisis as a potentially lethal kill-mechanism for end-Cretaceous planktic foraminifera. (Abstract shortened by UMI.).
- 주제명부출표목-일반주제명
- 주제명부출표목-일반주제명
- 부출표목-단체명
- 기본자료저록
- Dissertation Abstracts International. 77-07B(E).
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 원문정보보기
- 소장사항
-
20170404 2017
MARC
008170601s2016 us esm 001c eng■001MOKWON01251292
■00520170418113750
■007cr
■020 ▼a9781339466965
■035 ▼a(MiAaPQ)AAI10010684
■040 ▼aMiAaPQ▼cMiAaPQ
■090 ▼a전자도서(박사논문)
■1001 ▼aPunekar, Jahnavi.
■24510▼aPlanktic Foraminifera Extinctions and Delayed Biotic Recovery in the Late Maastrichtian-Early Danian: Link to Global Environmental Catastrophes?▼h[electronic resource]▼cPunekar, Jahnavi.
■260 ▼a[Sl]▼bPrinceton University▼c2016
■300 ▼a1 online resource(227 p)
■500 ▼aSource: Dissertation Abstracts International, Volume: 77-07(E), Section: B.
■500 ▼aAdviser: Gerta Keller.
■5021 ▼aThesis (Ph.D.)--Princeton University, 2016.
■520 ▼aThe final ~3 myr of the Maastrichtian (Late Cretaceous) and the first ~2 myr of the Danian (Early Paleogene) showcase multiple climate shifts, major sea level fluctuations and significant faunal turnovers that are unique in geologic history. This interval (69.0-64.0 Ma) brackets the controversial Cretaceous-Tertiary boundary (KTB or K-Pg) mass extinction and two prominent global catastrophes: the Chicxulub impact and Deccan volcanism. The immediate cause for the KTB mass extinction, whether impact or volcanism, has remained controversial for the past 35 years. The main objective of this thesis is to bring some clarity to this controversial mass extinction, and to understand and isolate the contributions of each event to the long-term evolution, diversification and extinction trends recorded by planktic foraminiferal assemblages.
■520 ▼aIn the past decade, three major phases of Deccan volcanism have been identified based on 40Ar/39Ar and magnetostratigraphy: phase-1 spanning the paleomagnetic chron C30r/C30n boundary (planktic foraminiferal zone CF4), phase-2 in the latest Maastrichtian C29r (zones CF1--CF2), and phase-3 in the early Danian C29n (P1b). Our results show that planktic foraminifera assemblages from the palaeo-Tethyean Egypt and Sinai record high-stress assemblages dominated by opportunist species Guembelitria tentatively coeval with each of the three volcanic phases. Guembelitria acme events correlative with phase-1 volcanism are relatively minor (80% of the total assemblage) are observed in CF1 spanning the last ~100 kyr of the Cretaceous, also correlative with abrupt climate warming and phase-2 Deccan volcanism. High-stress (50-- 75% Guembelitria) is also observed in zone P1b, marked by another climate warming (Dan- C2 event) and a major negative carbon isotope excursion correlative with phase-3 volcanism.
■520 ▼aOur review of the entire KTB database (~300 sites worldwide) in context of the latest available dates for Deccan volcanism confirmed time-correlation of faunal high-stress events with the last two major phases of Deccan volcanism worldwide. The major phase-2 is invariably associated with blooms of the opportunist Guembelitria in shallow-marine assemblages from India through the Tethys to the Atlantic Ocean. Similar high-stress environments dominated by opportunist blooms are observed globally correlative with phase- 3 volcanism in the Danian zone P1b. Biotic recovery is observed in Danian zone P1c, only after phase-3 volcanism ended. Deccan volcanism can therefore account for the end- Maastrichtian high-stress that ended in the mass extinction, and the ~500 kyr delay in marine recovery, respectively.
■520 ▼aThe cumulative loading of 10's of thousands of Gigatons (Gt) of volcanogenic CO2 into the end-Cretaceous atmosphere within 10's of thousand years would increase the atmospheric pCO2 on timescales that are recorded in the sediments. The potential acidification of oceans could have critically contributed to high environmental stress for marine calcifying organisms. Our study of the pre-KTB sediments from Bidart and Gamsbach show a concurrence of low magnetic susceptibility and high foraminifera test fragmentation index (FI), collectively forming the first-ever definitive evidence for ocean acidification linked to Deccan volcanism. We propose this carbonate crisis as a potentially lethal kill-mechanism for end-Cretaceous planktic foraminifera. (Abstract shortened by UMI.).
■590 ▼aSchool code: 0181.
■650 4▼aPaleontology
■650 4▼aSedimentary geology
■690 ▼a0418
■690 ▼a0594
■71020▼aPrinceton University▼bGeosciences.
■7730 ▼tDissertation Abstracts International▼g77-07B(E).
■773 ▼tDissertation Abstract International
■790 ▼a0181
■791 ▼aPh.D.
■792 ▼a2016
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T14487148▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a20170404▼f2017
