Journal
GEOLOGY
Volume 36, Issue 9, Pages 675-678Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G24728A.1
Keywords
Mississippi delta; incised valley; isostatic uplift and subsidence; Holocene sea-level change
Categories
Funding
- National Science Foundation
Ask authors/readers for more resources
During the last glacial period, when sea level was low, meltwater discharge drove incision of the lower Mississippi valley,with valley filling and delta construction during Holocene sea-level rise. Isostatic modeling shows that sediment volumes removed and replaced were sufficient to induce uplift of >9 m along valley margins followed by subsidence of the same magnitude, with effects dissipating only over distances of >100-150 km along the Gulf of Mexico coast. Recognition of cyclical uplift and subsidence refutes recent interpretations of delta stability, and suggests that late Holocene relative sea-level curves from the delta region are instead a record of subsidence of the pre-Holocene depocenter. More broadly, incised valley cutting and filling is a common fluvial response to glacio-eustasy, and cyclical uplift and subsidence should be common to large alluviall-deltaic systems elsewhere.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available