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DOI	10.1130/B35582.1
	Has Earth ever been ice-free? Implications for glacio-eustasy in the Cretaceous greenhouse age using high-resolution sequence stratigraphy
	Lin W.; Bhattacharya J.P.; Jicha B.R.; Singer B.S.; Matthews W.
发表日期	2020
ISSN	167606
起始页码	243
结束页码	252
卷号	133 期号:2021-01-02
英文摘要	Controls on high-frequency sequences formed during super-greenhouse conditions in the Late Cretaceous Western Interior Seaway remain equivocal because of the active foreland basin tectonic setting and the lack of direct evidence of polar glaciations to support a glacio-eustatic origin. This paper quantifes eustatic sea-level changes based on high-resolution sequence stratigraphic analysis and improved chronometry of shallow marine deposits of the Late Cretaceous Gallup Sandstone in New Mexico, USA. Backstripping techniques remove tectonic and compactional subsidence and enable quantifcation of the magnitude of eustatic sea-level change, that allow evaluation of the dominant controls on the high-frequency sequences to resolve the role of orbitally controlled, climate-driven eustasy versus tectonics. Sixty-fve parasequences, constituting 29 parasequence sets and 12 sequences are identifed in the ∼1.2 m.y. duration of the Late Cretaceous Gallup system. New 40Ar/39Ar dating of bentonites constrains the durations of the individual parasequences, parasequence sets, and sequences, and that these match Milankovitch periodicity, indicating an orbital climate control. The magnitudes of sea-level changes between parasequences range between -28 m and +22 m, which are compatible with hypotheses of both aquifer and glacio-eustasy. Aquifer-eustasy predicts a reciprocal relationship between foodplain cycles and shallow marine sequences, such that aquifer drawdown and falling water tables should correlate to rising sea levels (highstands), whereas increased aquifer storage and rising water tables should correlate to falling sea levels (lowstands). Our prelimi- nary observations show synchronous, versus reciprocal, relationships that may be more compatible with a glacio-eustatic origin. The results of this study support the hypothesis that the Cretaceous greenhouse was marked by high-frequency, low-amplitude glaciations driven by orbital climate cycles, but further work is required to evaluate the contribution of aquifer-eustasy. © 2020 Geological Society of America
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184852
作者单位	Exploration and Production, Suncor Energy, 150 6th Avenue SW, Alberta T2P 3E3, Calgary, Canada; School of Geography and Earth Sciences, McMaster University, 280 Main Street West, Ontario L8S 4L8, Hamilton, Canada; Department of Geoscience, University of Wisconsin-Madison, 1215 West Dayton Street, Madison, Wisconsin 53706, United States; Calgary Geo- and Thermochronology Lab, University of Calgary, 2500 University Drive NW, Alberta T2N 1N4, Calgary, Canada
推荐引用方式 GB/T 7714	Lin W.,Bhattacharya J.P.,Jicha B.R.,et al. Has Earth ever been ice-free? Implications for glacio-eustasy in the Cretaceous greenhouse age using high-resolution sequence stratigraphy[J],2020,133(2021-01-02).
APA	Lin W.,Bhattacharya J.P.,Jicha B.R.,Singer B.S.,&Matthews W..(2020).Has Earth ever been ice-free? Implications for glacio-eustasy in the Cretaceous greenhouse age using high-resolution sequence stratigraphy.Bulletin of the Geological Society of America,133(2021-01-02).
MLA	Lin W.,et al."Has Earth ever been ice-free? Implications for glacio-eustasy in the Cretaceous greenhouse age using high-resolution sequence stratigraphy".Bulletin of the Geological Society of America 133.2021-01-02(2020).