globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.04.004
论文题名:
Glacial dropstones in the western Tethys during the late Aptian-early Albian cold snap: Palaeoclimate and palaeogeographic implications for the mid-Cretaceous
作者: Rodríguez-López J.P.; Liesa C.L.; Pardo G.; Meléndez N.; Soria A.R.; Skilling I.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 452
起始页码: 11
结束页码: 27
语种: 英语
英文关键词: Glaciation ; HALIP ; Ice-magma interactions ; Iceberg drift ; Volcanism
英文摘要: The late Jurassic-early Cretaceous is commonly considered the only cold climatic interval in Earth history without any direct evidence of polar ice. A newly discovered dropstone-bearing interval from the subtropical Iberian Basin (western Tethys) is described and provides evidence of contemporaneous polar glaciation. This interval is correlated laterally for 4.8 km and contains a boulder and two cobble-sized quartzite dropstones that are encased in mid-Cretaceous fissile black shales and fine-grained sandstones. Based on previously published dimensions of similar large clasts, only glacial dropstones and impact ejecta blocks reach the dimensions of the boulder-sized dropstone reported from Iberia. The dropstones show morphological features compatible with glacial transport and abrasion in a subglacial setting which closely resembles the features observed in recent glacial boulders exposed near the snouts of glaciers in Iceland. These Late Aptian dropstones from Spain correlate with many other similar erratics in the northern and southern palaeohemispheres, and suggest that ice sheets formed around the palaeo-North Pole during certain periods of the early Cretaceous. Our results and associated evidence such as the occurrence of glendonites, tillites, moderate- to high-amplitude sea-level oscillations worldwide, minimum pCO2 concentrations, variation in calcareous nannofossil assemblages from low and high latitudes and isotopic excursions suggest that during the mid-Cretaceous there were periods of ice growth and decay that influenced the palaeotemperature, palaeoecology and sedimentology of the marine realm. The new data from Iberia are supported by recent results from Arctic Canada that indicate cool shelves and a mid-Cretaceous cold snap that developed for ~6 Myr between 118 and 112 Ma. The late Aptian dropstones reported in eastern Iberia were likely transported from high northern latitudes towards subtropical ones in the western Tethys by an extreme iceberg drift similar to those occurring at the present day in the Atlantic Ocean. Icebergs released from a northern fringing ice sheet may have travelled southwards through the Greenland-Norwegian Seaway. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68428
Appears in Collections:过去全球变化的重建

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作者单位: School of Applied Sciences, Faculty of Computing, Engineering and Sciences, University of South Wales, Glyntaf, Pontypridd, Rhondda Cynon Taff, United Kingdom; Grupo Geotransfer (DGA), Departamento de Ciencias de la Tierra, Facultad de Ciencias, Universidad de Zaragoza, C/Pedro Cerbuna 12, Zaragoza, Spain; Grupo de Análisis de Cuencas Sedimentarias Continentales (DGA), Departamento de Ciencias de la Tierra, Facultad de Ciencias, Universidad de Zaragoza, C/ Pedro Cerbuna 12, Zaragoza, Spain; Instituto de Geociencias (IGEO) (CSIC), Spain; Grupo de Análisis de Cuencas (UCM), Departamento de Estratigrafía (UCM), Facultad de Ciencias Geológicas, Instituto de GeoCiencias (IGEO UCM-CSIC) Ciudad Universitaria, Madrid, Spain

Recommended Citation:
Rodríguez-López J.P.,Liesa C.L.,Pardo G.,et al. Glacial dropstones in the western Tethys during the late Aptian-early Albian cold snap: Palaeoclimate and palaeogeographic implications for the mid-Cretaceous[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,452
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