Lower shoreface seismic stratigraphy and morphology off Fire Island, New York: Evidence for lobate progradation and linear erosion

doi:10.1016/j.csr.2018.04.013

	Lower shoreface seismic stratigraphy and morphology off Fire Island, New York: Evidence for lobate progradation and linear erosion
	Liu, Shihao 1,2; Goff, John A.2
刊名	CONTINENTAL SHELF RESEARCH
	2018-07
卷号	163 页码:23-34
关键词	Holocene transgression Seismic morphology Seismic stratigraphy Barrier system Ravinement Lower shoreface
ISSN号	0278-4343
DOI	10.1016/j.csr.2018.04.013
英文摘要	Under rising sea level conditions, barrier islands are largely ephemeral features, eroded on the seaward side by the transgressing shoreline and reformed by overwash to a more landward position. Locally, however, and over shorter time scales, shorelines can either advance or retreat, even in an overall transgressive environment, and the stratigraphy and morphology of the shoreface can be significantly impacted by the evolution of shoreface-attached bedforms. Fire Island, New York, is a well-studied example of such variability, with a stable-to-accreting shoreline at the western end and a retreating shoreline on the eastern end. In this study, we seek to better understand these differences by investigating the lower-shoreface stratigraphy at both stable/accreting (Fire Island West, or FIW) and retreating (Fire Island East, or FIE) shorefaces, using ultra-high resolution chirp seismic reflection data. Within the barrier/marine sands (the seismic unit between seafloor and shoreface ravinement), we identify six seismic units (WSUs 1-6 from bottom to top) in the FIW survey and two units (ESU1 and ESU2 from bottom to top) in the FIE survey; these units constitute the modem lower shoreface wedge. The barrier shoreface in the FIW survey is dominated by discrete and spatially-confined lobes. Isopach maps indicate that the lobe shifting was an episodic process with westward-migrating depocenters. The prograding shoreface was constructed by this lobate deposition; we speculate that these are related to ebb deposition from ephemeral barrier breaches/inlets. In the FIE survey, ESU2 accounts for the majority accumulation of the barrier shoreface and it is more linear than the lobate structure observed within the FIW survey, possibly derived from eroded shoreface sediments. Portions of this unit are absent however, exposing lower Pleistocene units to the erosive forces.
WOS关键词	INNER-CONTINENTAL-SHELF ; SEA-LEVEL RISE ; MIDDLE ATLANTIC SHELF ; ESTUARINE TIDAL BAR ; CENTRAL LONG-ISLAND ; BARRIER-ISLAND ; HOLOCENE TRANSGRESSION ; GEOLOGIC FRAMEWORK ; FLUVIAL CONTROLS ; GIRONDE ESTUARY
WOS研究方向	Oceanography
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000436219700003
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/26359]
专题	自然资源部第一海洋研究所
通讯作者	Liu, Shihao
作者单位	1.State Ocean Adm, Inst Oceanog 1, Res Ctr Isl & Coastal Zone, Qingdao 266061, Peoples R China 2.Univ Texas Austin, Inst Geophys, Jackson Sch Geosci, Austin, TX 78758 USA
推荐引用方式 GB/T 7714	Liu, Shihao,Goff, John A.. Lower shoreface seismic stratigraphy and morphology off Fire Island, New York: Evidence for lobate progradation and linear erosion[J]. CONTINENTAL SHELF RESEARCH,2018,163:23-34.
APA	Liu, Shihao,&Goff, John A..(2018).Lower shoreface seismic stratigraphy and morphology off Fire Island, New York: Evidence for lobate progradation and linear erosion.CONTINENTAL SHELF RESEARCH,163,23-34.
MLA	Liu, Shihao,et al."Lower shoreface seismic stratigraphy and morphology off Fire Island, New York: Evidence for lobate progradation and linear erosion".CONTINENTAL SHELF RESEARCH 163(2018):23-34.