伊比利亚大陆白垩纪中纬度地区的浮冰坠石

IF 4.8 1区 地球科学 Q1 GEOLOGY
Geology Pub Date : 2023-10-10 DOI:10.1130/g51725.1
Juan Pedro Rodríguez-López, Carlos L. Liesa, Aránzazu Luzón, Arsenio Muñoz, María J. Mayayo, Julian B. Murton, Ana R. Soria
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引用次数: 0

摘要

白垩纪被广泛认为是一个受超级温室条件影响的时期。在这里,我们提供了在Hauterivian寒流期间伊比利亚大陆古中纬度(~ 45°N)冰川发育的多尺度沉积学证据。在西班牙喀麦隆盆地东部的恩西索群的湖相层序中,出现了条纹状和面状的冰筏状冰川坠石(鹅卵石到巨石大小)以及条纹状和沟槽状的淤泥到沙子大小的颗粒(冰筏状碎屑[IRD])。这些浮冰构成了欧洲白垩纪大陆冰冻圈记录的第一个证据,它们被归因于冰川口的崩解,将冰山释放到一个与冰接触的湖泊中。沉积序列类似于加拿大北极东部晚更新世劳伦泰德冰盖覆盖的湖泊的冰川-去冰记录。伊比利亚冰川演替与亚洲的高原永久冻土以及北极和澳大利亚的IRD记录是同步的,揭示了在全球豪特里维亚寒流期间,一个比先前认为的更强大的冰冻圈。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ice-rafted dropstones at midlatitudes in the Cretaceous of continental Iberia
The Cretaceous is widely considered to have been a period subjected to super-greenhouse conditions. Here, we provide multiscale sedimentologic evidence of glaciers developing at mid-paleolatitudes (∼45°N) in continental Iberia during the Hauterivian cold snap. Striated and faceted ice-rafted glacial dropstones (cobble to boulder size) and striated and grooved silt- to sand-sized grains (ice-rafted debris [IRD]) occur in a lacustrine sequence of the Enciso Group in the eastern Cameros Basin, Spain. The ice-rafted materials constitute the first evidence reported for a Cretaceous continental cryospheric record in Europe, and they are attributed to calving of glacier snouts, releasing icebergs into an ice-contact lake. The sedimentary succession resembles glacial-deglacial records in lakes overridden by the late Pleistocene Laurentide Ice Sheet in eastern Arctic Canada. The Iberian glacial succession was coeval with plateau permafrost in Asia and IRD records in the Arctic and Australia, revealing a stronger than previously thought cryosphere during the global Hauterivian cold snap.
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来源期刊
Geology
Geology 地学-地质学
CiteScore
10.00
自引率
3.40%
发文量
228
审稿时长
6.2 months
期刊介绍: Published since 1973, Geology features rapid publication of about 23 refereed short (four-page) papers each month. Articles cover all earth-science disciplines and include new investigations and provocative topics. Professional geologists and university-level students in the earth sciences use this widely read journal to keep up with scientific research trends. The online forum section facilitates author-reader dialog. Includes color and occasional large-format illustrations on oversized loose inserts.
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