气候变化领域集成服务门户(CCPortal): Seismic Stratigraphy of Contourite Drift Deposits Associated With the Loop Current on the Eastern Campeche Bank, Gulf of Mexico

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DOI	10.1029/2023PA004701
	Seismic Stratigraphy of Contourite Drift Deposits Associated With the Loop Current on the Eastern Campeche Bank, Gulf of Mexico
	Lowery, Christopher M.; Cruz, Ligia Perez; Fucugauchi, Jaime Urrutia; Wei, Jingxuan; Austin Jr, James A.; Standring, Patricia
发表日期	2024
ISSN	2572-4517
EISSN	2572-4525
起始页码	39
结束页码	3
卷号	39 期号:3
英文摘要	The Loop Current is a key component of global circulation via the northward transport of warm, salty water, and an important influence on Gulf of Mexico hydrography. Understanding how the Loop Current will respond to ongoing anthropogenic warming is critically important, but the history of the Loop Current is poorly known. Here, we present the results of a high resolution (3-8 m) multichannel seismic survey of pelagic carbonate sediment drifts on the eastern Campeche Bank associated with the Loop Current. We identify three seismic megasequences: Megasequence A is a Lower Cretaceous carbonate platform, Megasequence B comprises Cretaceous to lower Cenozoic pelagic carbonates with weak/no contour current flow, and Megasequence C comprises a series of large (100s of m thick) contourite drifts representing the inception and history of the Loop Current. The base of the contourites is marked by a regionally mappable unconformity eroding underling strata, sometimes incising hundreds of meters. The drifts contain a succession of sequence sets separated from each other by regional unconformities and comprising plastered drifts and massive mounded drifts, which characterize modern deposition with active moats on the seafloor. A lack of sediment cores in the study area precludes age determination of these drifts, except for the youngest (Late Pleistocene). Comparison to legacy seismic lines across Deep Sea Drilling Project Site 95, outside our study area, implies that the base of Megasequence C is Oligocene in age, and that the Loop Current developed during the global reorganization of ocean circulation around the Eocene-Oligocene Transition. The Loop Current flows into the Gulf of Mexico from the Caribbean through the Yucatan Strait and exits to the Atlantic Ocean through the Straits of Florida. It is part of a series of currents that carry warm, salty water to the far North Atlantic, where it cools and sinks, and becomes a critical part of global ocean circulation. The Loop Current is also important for Gulf of Mexico climate, as it sometimes spins off warm eddies which drift west, disrupting fisheries and providing a warm water fuel source for hurricanes. Because of its role in global and regional climate, it is important to understand how the Loop Current will respond to ongoing climate change, and an essential part of that effort is seeing how it has responded to past climate changes. Here, we report the results of a seismic survey of sediment drifts on the eastern Campeche Bank which we believe records the initiation and history of the Loop Current. A lack of sediment cores in this area makes it hard to put age constraints on our observations, so we evaluate several plausible hypotheses about when the Loop Current first formed and what that means for the current's future. High resolution multichannel seismic data reveal the evolution of contourite drifts associated with the Loop Current Contourite deposition began in the Cenozoic, and overlies Cenozoic and Cretaceous pelagic sediments with little evidence of bottom currents Comparison of seismic facies with those present at nearby DSDP Site 95 suggest the Loop Current began in the early Oligocene
英文关键词	loop current; Gulf of Mexico; seismic stratigraphy; contourite drift; paleoceanography; tipping points
语种	英语
WOS研究方向	Geology ; Oceanography ; Paleontology
WOS类目	Geosciences, Multidisciplinary ; Oceanography ; Paleontology
WOS记录号	WOS:001178104500001
来源期刊	PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306756
作者单位	University of Texas System; University of Texas Austin; Universidad Nacional Autonoma de Mexico
推荐引用方式 GB/T 7714	Lowery, Christopher M.,Cruz, Ligia Perez,Fucugauchi, Jaime Urrutia,et al. Seismic Stratigraphy of Contourite Drift Deposits Associated With the Loop Current on the Eastern Campeche Bank, Gulf of Mexico[J],2024,39(3).
APA	Lowery, Christopher M.,Cruz, Ligia Perez,Fucugauchi, Jaime Urrutia,Wei, Jingxuan,Austin Jr, James A.,&Standring, Patricia.(2024).Seismic Stratigraphy of Contourite Drift Deposits Associated With the Loop Current on the Eastern Campeche Bank, Gulf of Mexico.PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,39(3).
MLA	Lowery, Christopher M.,et al."Seismic Stratigraphy of Contourite Drift Deposits Associated With the Loop Current on the Eastern Campeche Bank, Gulf of Mexico".PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY 39.3(2024).