Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B35074.1 |
The duration and magnitude of Cretaceous cool events: Evidence from the northern high latitudes | |
Vickers, Madeleine L.1; Price, Gregory D.2; Jerrett, Rhodri M.3; Sutton, Paul A.2; Watkinson, Matthew P.2; FitzPatrick, Meriel2 | |
2019-11-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2019 |
卷号 | 131页码:1979-1994 |
文章类型 | Article |
语种 | 英语 |
国家 | Denmark; England |
英文摘要 | The Early Cretaceous (145-100 Ma) was characterized by long-term greenhouse climates, with a reduced equatorial to polar temperature gradient, although an increasingly large body of evidence suggests that this period was punctuated by episodic global "cold snaps." Understanding climate dynamics during this high-atmospheric CO2 period of Earth's history may have significant impact on how we understand climatic feedbacks and predict future global climate changes under an anthropogenically-driven high-pCO(2) atmosphere. This study utilizes facies analysis to constrain the paleobathymetry of Lower Cretaceous glendonites- a pseudomorph after ikaite, a mineral that forms naturally at 7 degrees C or lower-from two paleo-high-latitude (60-70 degrees N) sites in Svalbard, Arctic Norway, to infer global climatic changes during the Early Cretaceous. The original ikaite formed in the offshore transition zone of a shallow marine shelf at water depths of <100 m, suggesting mean annual water temperatures of <= 7 degrees C at these depths at 60-70 degrees N. We correlate glendonite-bearing horizons from Lower Cretaceous successions around the globe using carbon isotope stratigraphy, in conjunction with the pre-existing biostratigraphic framework, in order to infer northern hemispheric to global climatic cooling. A distinct interval of glendonites in the Northern Hemisphere, from sites >60 degrees N, spans the late Berriasian to earliest Barremian (at least 8.6 m.y.), significantly prolonging the duration of the previously hypothesized Valanginian cold snap (associated with the "Weissert Event"). Widespread glendonites occur again in late Aptian and extend to the early Albian, in both hemispheres, corroborating other proxy evidence for late Aptian cooling. The glendonites from Svalbard suggest that Cretaceous cold episodes were characterized with high latitude (>60 degrees N) shallow water temperatures that are consistent with the existence of a small northern polar ice cap at this time. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000493796300013 |
WOS关键词 | CARBON-ISOTOPE STRATIGRAPHY ; LARGE IGNEOUS PROVINCE ; CALCAREOUS NANNOFOSSILS ; CALCIUM-CARBONATE ; AIR-TEMPERATURE ; SVERDRUP BASIN ; COLD SNAPS ; IKKA-FJORD ; IKAITE ; SEA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/188065 |
专题 | 地球科学 |
作者单位 | 1.Univ Copenhagen, Dept Geosci & Nat Resource Management, Oster Voldgade 10, DK-1350 Copenhagen, Denmark; 2.Plymouth Univ, Ctr Res Earth Sci, Sch Geog Earth & Environm Sci, Plymouth PL4 8AA, Devon, England; 3.Univ Manchester, Sch Earth & Environm Sci, Oxford Rd, Manchester M13 9PL, Lancs, England |
推荐引用方式 GB/T 7714 | Vickers, Madeleine L.,Price, Gregory D.,Jerrett, Rhodri M.,et al. The duration and magnitude of Cretaceous cool events: Evidence from the northern high latitudes[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2019,131:1979-1994. |
APA | Vickers, Madeleine L.,Price, Gregory D.,Jerrett, Rhodri M.,Sutton, Paul A.,Watkinson, Matthew P.,&FitzPatrick, Meriel.(2019).The duration and magnitude of Cretaceous cool events: Evidence from the northern high latitudes.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,131,1979-1994. |
MLA | Vickers, Madeleine L.,et al."The duration and magnitude of Cretaceous cool events: Evidence from the northern high latitudes".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 131(2019):1979-1994. |
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