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DOI	10.1130/B31796.1
	Evidence of tectonism based on differential uplift of the Falmouth Formation of Jamaica
	Skrivanek A.; Dutton A.; Stemann T.; Vyverberg K.; Mitrovica J.X.
发表日期	2018
ISSN	167606
起始页码	707
结束页码	720
卷号	130 期号:2021-05-06
英文摘要	The relative influence of ice-age sea-level change and tectonic displacement on the present elevation of Last Interglacial reefs exposed within the Falmouth Formation along the coastlines of Jamaica has been debated, casting doubt on the degree to which these outcrops can be used with other records to infer ancient ice volumes. To assess the potential for postdepositional tectonic displacement, we surveyed maximum elevations of fossil reef outcrops of the Falmouth Formation at nine sites along the northern and southern coastlines of Jamaica, and we found that its peak elevation varies by up to 8 m among study sites. Based on our analysis of reef facies and paleowater depth at each site, we conclude that the difference in elevations between outcrops cannot be explained by natural variation in reef topography or glacial isostatic adjustment, implying that postdepositional tectonic displacement has occurred. To estimate differences in the magnitude of vertical tectonic movement between sites, we reconstructed peak relative sea-level (RSL) position during the Last Interglacial sea-level highstand by combining survey measurements with paleowater depth interpretations derived from an analysis of the uppermost exposed reef facies. To estimate rates of postdepositional vertical tectonic displacement, we then compared our reconstructed RSL positions with predictions of RSL based on glacial isostatic modeling, including the fingerprint of meltwater signals. Estimated rates of vertical displacement decline from east to west along the north coast from > 100 mm/1000 yr (k.y.) at Oracabessa to ~1 mm/k.y. at Rio Bueno Harbor. In the south, subsidence is inferred, with estimates ranging from ~-27 to -14 mm/k.y. The eastwest gradient in uplift across the north coast is consistent with the proximity of the eastern sites to the inverted Wagwater belt and seismically active Blue Mountain restraining bend, and it indicates differential tectonic displacement of the Falmouth Formation since its deposition. © 2017 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/185025
作者单位	Department of Geological Sciences, University of Florida, Gainesville, FL 32611, United States; Department of Geography and Geology, The University of the West Indies, Mona, Kingston 7, Jamaica; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, United States
推荐引用方式 GB/T 7714	Skrivanek A.,Dutton A.,Stemann T.,et al. Evidence of tectonism based on differential uplift of the Falmouth Formation of Jamaica[J],2018,130(2021-05-06).
APA	Skrivanek A.,Dutton A.,Stemann T.,Vyverberg K.,&Mitrovica J.X..(2018).Evidence of tectonism based on differential uplift of the Falmouth Formation of Jamaica.Bulletin of the Geological Society of America,130(2021-05-06).
MLA	Skrivanek A.,et al."Evidence of tectonism based on differential uplift of the Falmouth Formation of Jamaica".Bulletin of the Geological Society of America 130.2021-05-06(2018).