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- W2902342263 abstract "Research Article| November 30, 2018 Millennial-scale climate changes manifest Milankovitch combination tones and Hallstatt solar cycles in the Devonian greenhouse world A.C. Da Silva; A.C. Da Silva * 1Sedimentary Petrology Laboratory, Liège University, 4000 Liège, Belgium2Department of Earth Sciences, Utrecht University, PO Box 80125, 3508 TC Utrecht, Netherlands *E-mail: ac.dasilva@uliege.be Search for other works by this author on: GSW Google Scholar M.J. Dekkers; M.J. Dekkers 2Department of Earth Sciences, Utrecht University, PO Box 80125, 3508 TC Utrecht, Netherlands Search for other works by this author on: GSW Google Scholar D. De Vleeschouwer; D. De Vleeschouwer 3MARUM–Zentrum für Marine Umweltwissenschaften, Universität Bremen, 28359 Bremen, Germany Search for other works by this author on: GSW Google Scholar J. Hladil; J. Hladil 4Institute of Geology of the Czech Academy of Sciences, CZ-165 00 Prague 6 – Lysolaje, Czech Republic Search for other works by this author on: GSW Google Scholar L. Chadimova; L. Chadimova 4Institute of Geology of the Czech Academy of Sciences, CZ-165 00 Prague 6 – Lysolaje, Czech Republic Search for other works by this author on: GSW Google Scholar L. Slavík; L. Slavík 4Institute of Geology of the Czech Academy of Sciences, CZ-165 00 Prague 6 – Lysolaje, Czech Republic Search for other works by this author on: GSW Google Scholar F.J. Hilgen F.J. Hilgen 2Department of Earth Sciences, Utrecht University, PO Box 80125, 3508 TC Utrecht, Netherlands Search for other works by this author on: GSW Google Scholar Author and Article Information A.C. Da Silva * 1Sedimentary Petrology Laboratory, Liège University, 4000 Liège, Belgium2Department of Earth Sciences, Utrecht University, PO Box 80125, 3508 TC Utrecht, Netherlands M.J. Dekkers 2Department of Earth Sciences, Utrecht University, PO Box 80125, 3508 TC Utrecht, Netherlands D. De Vleeschouwer 3MARUM–Zentrum für Marine Umweltwissenschaften, Universität Bremen, 28359 Bremen, Germany J. Hladil 4Institute of Geology of the Czech Academy of Sciences, CZ-165 00 Prague 6 – Lysolaje, Czech Republic L. Chadimova 4Institute of Geology of the Czech Academy of Sciences, CZ-165 00 Prague 6 – Lysolaje, Czech Republic L. Slavík 4Institute of Geology of the Czech Academy of Sciences, CZ-165 00 Prague 6 – Lysolaje, Czech Republic F.J. Hilgen 2Department of Earth Sciences, Utrecht University, PO Box 80125, 3508 TC Utrecht, Netherlands *E-mail: ac.dasilva@uliege.be Publisher: Geological Society of America Received: 21 Aug 2018 Revision Received: 12 Oct 2018 Accepted: 25 Oct 2018 First Online: 30 Nov 2018 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2018 Geological Society of America Geology (2019) 47 (1): 19–22. https://doi.org/10.1130/G45511.1 Article history Received: 21 Aug 2018 Revision Received: 12 Oct 2018 Accepted: 25 Oct 2018 First Online: 30 Nov 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation A.C. Da Silva, M.J. Dekkers, D. De Vleeschouwer, J. Hladil, L. Chadimova, L. Slavík, F.J. Hilgen; Millennial-scale climate changes manifest Milankovitch combination tones and Hallstatt solar cycles in the Devonian greenhouse world. Geology 2018;; 47 (1): 19–22. doi: https://doi.org/10.1130/G45511.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Sub-Milankovitch rhythmic features in sedimentary records have been reported from throughout geological time. However, their origin remains enigmatic, in particular during so-called greenhouse periods in Earth’s history. To better understand such short-term climatic changes, we sampled two 3-m-thick intervals of early Devonian hemipelagic carbonate at 1 cm resolution in the Pod Barrandovem section (Czech Republic). Greenhouse conditions prevailed during early Devonian times, and the chosen resolution enables the detection of millennial-scale climate change as recorded by elemental abundances. We used a previously published astrochronology for the section to transform the studied series from the stratigraphic into the time domain. Spectral analysis of the time-calibrated log-transformed Ti records reveal obliquity and precession cycles, confirming the applied astrochronology. Additional spectral peaks with periods of 2.3–2.7, 6–8, and 10–12 k.y. appear in both records. Furthermore, a 1.5 k.y. periodicity, close to the Pleistocene Dansgaard-Oeschger oscillation, is also identified, but only in the record with higher accumulation rate (∼3.5 cm/k.y.). Bi-coherence spectra reveal that the 6–8 and 10–12 k.y. periodic components are combination tones of Milankovitch cycles. We infer the shorter ∼2.5 k.y. periodicity to be the result of solar forcing, related to the Hallstatt cycle. These new observations strengthen the case for an external origin of millennial-scale features. 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- W2902342263 title "Millennial-scale climate changes manifest Milankovitch combination tones and Hallstatt solar cycles in the Devonian greenhouse world" @default.
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