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|a Quantifying Holocene lithospheric subsidence rates underneath the Mississippi Delta |h [electronic resource]. |
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|a Earth and Planetary Sciences Letters. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a The pattern of Holocene relative sea-level (RSL) change on the US Gulf Coast has been a long-standing subject
of debate, featuring opposing scenarios of continuous submergence versus one or more Holocene RSL
highstands. The significance of this debate is that the relative role of eustasy, glacial isostatic adjustment
(GIA), and lithospheric flexural subsidence associated with Mississippi Delta sediment loading remains unresolved.
Here we present a new RSL record from the Louisiana Chenier Plain, >100 km west of the Mississippi
Delta margin, based on AMS 14C dated marsh basal peat. This enables us to provide – for the first time –
constraints on Holocene lithospheric subsidence rates underneath one of the world's major deltas. Our
new record conclusively shows that no middle Holocene RSL highstands occurred on the central US Gulf
Coast. Rather, it exhibits a pattern of progressive RSL rise comparable to that from the Mississippi Delta, suggesting
that long-wavelength GIA is a dominant deformational process driving lithospheric subsidence in the
entire region by means of forebulge collapse. Nevertheless, a 0.15±0.07 mm/yr differential rate of
subsidence between the Chenier Plain and key portions of the Mississippi Delta (including the New Orleans
metropolitan area) exists. This shows that while the sediment loading effect is real, it is about an order of
magnitude smaller than recent studies have postulated. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a Mississippi delta (Miss.:Region). |
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|a Torbjorn E. Tornqvist. |
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|t Quantifying Holocene lithospheric subsidence rates underneath the Mississippi Delta |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15060906/00001 |y Click here for full text |
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|3 Host material |u http://www.sciencedirect.com/science/article/pii/S0012821X12001112 |y Quantifying Holocene lithospheric subsidence rates underneath the Mississippi Delta |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/09/06/00001/Yu et al_2012_Quantifying Holocene lithospheric subsidence rates underneath the Mississippithm.jpg |
