globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2019.115865
论文题名:
A lower to middle Eocene astrochronology for the Mentelle Basin (Australia) and its implications for the geologic time scale
作者: Vahlenkamp M.; De Vleeschouwer D.; Batenburg S.J.; Edgar K.M.; Hanson E.; Martinez M.; Pälike H.; MacLeod K.G.; Li Y.-X.; Richter C.; Bogus K.; Hobbs R.W.; Huber B.T.; Expedition 369 Scientific Participants
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 529
语种: 英语
中文关键词: astrochronology ; astronomical forcing ; Eocene ; IODP 369 ; Mentelle Basin
英文关键词: Carbonation ; Offshore oil well production ; Stratigraphy ; astrochronology ; Astronomical forcing ; Eocene ; IODP 369 ; Mentelle Basin ; Time measurement ; astronomy ; biostratigraphy ; Eocene ; geochronology ; isotopic analysis ; radiocarbon dating ; sedimentology ; timescale ; Indian Ocean ; Mentelle Basin ; Western Australian Margin
英文摘要: The geologic time scale for the Cenozoic Era has been notably improved over the last decades by virtue of integrated stratigraphy, combining high-resolution astrochronologies, biostratigraphy and magnetostratigraphy with high-precision radioisotopic dates. However, the middle Eocene remains a weak link. The so-called “Eocene time scale gap” reflects the scarcity of suitable study sections with clear astronomically-forced variations in carbonate content, primarily because large parts of the oceans were starved of carbonate during the Eocene greenhouse. International Ocean Discovery Program (IODP) Expedition 369 cored a carbonate-rich sedimentary sequence of Eocene age in the Mentelle Basin (Site U1514, offshore southwest Australia). The sequence consists of nannofossil chalk and exhibits rhythmic clay content variability. Here, we show that IODP Site U1514 allows for the extraction of an astronomical signal and the construction of an Eocene astrochronology, using 3-cm resolution X-Ray fluorescence (XRF) core scans. The XRF-derived ratio between calcium and iron content (Ca/Fe) tracks the lithologic variability and serves as the basis for our U1514 astrochronology. We present a 16 million-year-long (40-56 Ma) nearly continuous history of Eocene sedimentation with variations paced by eccentricity and obliquity. We supplement the high-resolution XRF data with low-resolution bulk carbon and oxygen isotopes, recording the long-term cooling trend from the Paleocene-Eocene Thermal Maximum (PETM – ca. 56 Ma) into the middle Eocene (ca. 40 Ma). Our early Eocene astrochronology corroborates existing chronologies based on deep-sea sites and Italian land sections. For the middle Eocene, the sedimentological record at U1514 provides a single-site geochemical backbone and thus offers a further step towards a fully integrated Cenozoic geologic time scale at orbital resolution. © 2019 The Author(s)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165321
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作者单位: MARUM – Center for Marine and Environmental Sciences, University of Bremen, Klagenfurter Straße 2-4, Bremen, 28359, Germany; Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, United Kingdom; Géosciences Rennes, UMR 6118, Université de Rennes 1, Rennes, 35042, France; School of Geography, Earth and Environmental Sciences, University of Birmingham, Aston Webb Building Block A, Edgbaston, B15 2TT, United Kingdom; Department of Geological Sciences, University of Missouri, Columbia, 101 Geological Sciences Building, Columbia, MO 65211, United States; School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Avenue, Nanjing, 210046, China; School of Geosciences, University of Louisiana at Lafayette, 611 McKinley Street, Lafayette, LA 70504, United States; International Ocean Discovery Program, Texas A&M University, 1000 Discovery Drive, College Station, TX 77845-9547, United States; Camborne School of Mines, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Penryn, Cornwall TR10 9FE, United Kingdom; Department of Earth Sciences, University of Durham, Durham, DH1 3LE, United Kingdom; National Museum of Natural History, Smithsonian Institution, MRC: NHB 121, 10th and Constitution Avenue NW, Washington, DC 20560, United States

Recommended Citation:
Vahlenkamp M.,De Vleeschouwer D.,Batenburg S.J.,et al. A lower to middle Eocene astrochronology for the Mentelle Basin (Australia) and its implications for the geologic time scale[J]. Earth and Planetary Science Letters,2020-01-01,529
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