气候变化领域集成服务门户(CCPortal): Late Quaternary evolution and stratigraphic framework influence on coastal systems along the north-central Gulf of Mexico; USA

CCPortal

DOI	10.1016/j.quascirev.2019.105910
	Late Quaternary evolution and stratigraphic framework influence on coastal systems along the north-central Gulf of Mexico; USA
	Hollis R.J.; Wallace D.J.; Miner M.D.; Gal N.S.; Dike C.; Flocks J.G.
发表日期	2019
ISSN	0277-3791
卷号	223
英文摘要	Coastal systems in the Gulf of Mexico are threatened by reduced sediment supply, storm impacts and relative sea-level rise (RSLR). The geologic record provides insight into geomorphic evolution thresholds to these forcing mechanisms to help predict future barrier evolution in response to climate change. This study synthesizes ∼2100 km of geophysical data, 700 + sediment cores, and 62 radiocarbon dates to regionally map two lowstand sequence boundaries, multiple ravinement surfaces and fourteen depositional facies demonstrating stratigraphic and antecedent topographic influences on coastal evolution. The Mississippi-Alabama (MSAL) barriers are anchored by a marine isotope stage (MIS) 5e section of Dauphin Island coupled with an MIS 2 surface gradient change. Sand for the modern MSAL barriers were largely sourced through Holocene transgressive ravinement of relict valley fill deposits, providing up to 300 × 106 m3 of sand. Mud-filled MIS 2 tributaries correspond to areas of repeated storm breaching or tidal inlets. A Holocene geomorphic evolutionary model was created for Petit Bois and Dauphin Islands, highlighting RSLR rates, changes in sediment supply and the antecedent geologic framework. As the MIS 2 surface was flooded, tidal/wave scour supplied sand to migrating marine shoals. These transgressing shoals converted drowned paleovalleys to estuaries ∼9ka BP. Islands formed in their modern positions ∼6ka BP, when sediment supply was high and RSLR rates were 2 mm/yr. Between ∼4ka-1750 CE, islands prograded from reduced RSLR rates of 1-0.4 mm/yr and sufficient sand supply from alongshore/inner shelf sources. Currently, the islands experience 3.74 mm/yr of RSLR and reduced sediment supply, resulting in barrier degradation. © 2019 Elsevier Ltd
英文关键词	Coastal geology; Dauphin Island; Geomorphology; Geomorphology; Geophysical; Holocene; Inner shelf; MIS 2; Petit Bois Island; Sequence stratigraphy
语种	英语
scopus关键词	Climate change; Deposition; Geomorphology; Glacial geology; Landforms; Sand; Scour; Sea level; Sediments; Storms; Coastal geology; Dauphin Island; Geophysical; Holocenes; Inner shelf; Petit Bois Island; Sequence stratigraphy; Stratigraphy; coastal evolution; coastal zone; geomorphology; Holocene; marine isotope stage; Quaternary; sea level change; sediment transport; sequence stratigraphy; valley fill; Alabama; Atlantic Ocean; Dauphin Island; Gulf of Mexico; Petit Bois Pass; United States
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151723
作者单位	School of Ocean Science and Engineering, University of Southern Mississippi, Stennis Space CenterMS 39529, United States; The Water Institute of the Gulf, New Orleans, LA 70122, United States; U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL 33701, United States
推荐引用方式 GB/T 7714	Hollis R.J.,Wallace D.J.,Miner M.D.,et al. Late Quaternary evolution and stratigraphic framework influence on coastal systems along the north-central Gulf of Mexico; USA[J],2019,223.
APA	Hollis R.J.,Wallace D.J.,Miner M.D.,Gal N.S.,Dike C.,&Flocks J.G..(2019).Late Quaternary evolution and stratigraphic framework influence on coastal systems along the north-central Gulf of Mexico; USA.Quaternary Science Reviews,223.
MLA	Hollis R.J.,et al."Late Quaternary evolution and stratigraphic framework influence on coastal systems along the north-central Gulf of Mexico; USA".Quaternary Science Reviews 223(2019).