Aptian-Albian Cold Snap
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The Aptian-Albian Cold Snap (AACS) was an interval of cool climate during the late Aptian and early Albian stages of the Early Cretaceous epoch. It began about 118 Ma and ended approximately 111 Ma.[1] It has been speculated that an ice age developed during this cool interval.[2]
Effects
[edit]Based on δ18O palaeothermometry, global mean surface temperatures during the AACS were about 20.7 °C.[1] There is some evidence that an ice age occurred during the AACS,[3] as glacial dropstones dating to the AACS have been found in sediments deposited in what was then the western Tethys Ocean.[2] In the Cedar Mountain Formation of Utah, the AACS is associated with a decrease in organic sedimentation in Lake Carpenter reflecting a drying trend.[4] Mean annual air temperatures in northwestern China, located in the mid-latitudes, were about 15 °C.[5]
During the AACS, chondrodont bivalves have been observed to have colonised carbonate ramps in areas such as the Aralar carbonate platform.[6]
References
[edit]- ^ a b Scotese, Christopher Robert; Song, Haijun; Mills, Benjamin J. W.; van der Meer, Douwe G. (April 2021). "Phanerozoic paleotemperatures: The earth's changing climate during the last 540 million years". Earth-Science Reviews. 215: 103503. Bibcode:2021ESRv..21503503S. doi:10.1016/j.earscirev.2021.103503. ISSN 0012-8252. S2CID 233579194. Archived from the original on 8 January 2021. Retrieved 31 October 2024.
- ^ a b Rodríguez-López, Juan Pedro; Liesa, Carlos L.; Pardo, Gonzalo; Meléndez, Nieves; Soria, Ana R.; Skilling, Ian (15 June 2016). "Glacial dropstones in the western Tethys during the late Aptian–early Albian cold snap: Palaeoclimate and palaeogeographic implications for the mid-Cretaceous". Palaeogeography, Palaeoclimatology, Palaeoecology. 452: 11–27. Bibcode:2016PPP...452...11R. doi:10.1016/j.palaeo.2016.04.004. Retrieved 1 November 2024 – via Elsevier Science Direct.
- ^ Mutterlose, Jörg Bornemann (15 May 2009). "The Aptian Albian cold snap: Evidence for "mid" Cretaceous icehouse interludes". Neues Jahrbuch für Geologie und Paläontologie. 252 (2): 217–225. doi:10.1127/0077-7749/2009/0252-0217. ISSN 0077-7749. Retrieved 1 November 2024.
- ^ Suarez, Marina B.; Al Suwaidi, Aisha; Montgomery, Elizabeth H.; Kirkland, James I.; Andrew, Joe; Mclean, Noah; Möller, Andreas; Ludvigson, Gregory; Suarez, Celina A. (22 September 2023). "New Geochronological Age Constraint and Chemostratigraphy for Aptian Lacustrine Strata, Cedar Mountain Formation, Utah". Geochemistry, Geophysics, Geosystems. 24 (9). Bibcode:2023GGG....2411014S. doi:10.1029/2023GC011014. ISSN 1525-2027. Retrieved 31 October 2024.
- ^ Harper, Dustin T.; Suarez, Marina B.; Uglesich, Jessica; You, Hailu; Li, Daqing; Dodson, Peter (3 August 2021). "Aptian–Albian clumped isotopes from northwest China: cool temperatures, variable atmospheric <i>p</i>CO<sub>2</sub> and regional shifts in the hydrologic cycle". Climate of the Past. 17 (4): 1607–1625. doi:10.5194/cp-17-1607-2021. ISSN 1814-9332. Retrieved 31 October 2024.
- ^ Millán, M. I.; Weissert, Helmut J.; López-Horgue, M. A. (October 2014). "Expression of the late Aptian cold snaps and the OAE1b in a highly subsiding carbonate platform (Aralar, northern Spain)". Palaeogeography, Palaeoclimatology, Palaeoecology. 411: 167–179. Bibcode:2014PPP...411..167M. doi:10.1016/j.palaeo.2014.06.024. Retrieved 31 October 2024 – via Elsevier Science Direct.