skip to main content

Title: Parameters of peat formation in the Mississippi Delta

The Mississippi Delta consists of six major Holocene deltaic complexes, that each had a life-span of about 1500 years. Emphasis of this study is on autochthonous peats of Barataria Basin, a large-scale interdistributary basin, between levees of the LaFourche and St. Bernard/Plaquemine deltas. Organic-rich beds occur in three phases, each representing an accumulating period that was interrupted by subsidence and the influx of detrital clastics from renewed nearby fluvio-deltaic sedimentation. In central Barataria Basin, peat beds are laterally discontinuous, contrasting with more continuous ones in the upper Basin. This difference reflects greater subsidence and overbank flooding in the central Basin, compared to the upper Basin. In the upper Basin, accumulation rates balanced with subsidence, whereas in the central Basin, fault-induced subsidence rates were higher, creating a flood-prone depression. Quantities of organic-rich material and true peat, as well as quantities of peat and organic-poor material are inversely related. The latter correlation indicates either one of two possible settings: (1) more peat accumulated on top of organic-poor material, because organic-poor beds provided a base for plant growth and a supply of nutrients; (2) organic-poor material accumulated preferentially on top of peat because peat-accumulating areas eventually form flood-prone topographic lows. Relatively low meanmore » organic matter content of peats in the Mississippi Delta is influenced by botanical parent material and short-term detrital clastic influx. Thickness and lateral continuity are restricted by subsidence and accretion rates, marine inundation and long-term effects of detrital clastic influx.« less
Authors:
Publication Date:
OSTI Identifier:
7152725
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Publisher:
Louisiana State Univ. and Agricultural and Mechanical College,Baton Rouge, LA
Research Org:
Louisiana State Univ., Baton Rouge (USA)
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; CARBONACEOUS MATERIALS; ORIGIN; PEAT; WETLANDS; GEOLOGIC HISTORY; STRATIGRAPHY; ALLUVIAL DEPOSITS; GEOLOGIC FAULTS; SEDIMENTARY BASINS; THICKNESS; AQUATIC ECOSYSTEMS; DIMENSIONS; ECOSYSTEMS; ENERGY SOURCES; FOSSIL FUELS; FUELS; GEOLOGIC DEPOSITS; GEOLOGIC FRACTURES; GEOLOGIC STRUCTURES; GEOLOGY; MATERIALS; ORGANIC MATTER 011000* -- Coal, Lignite, & Peat-- Reserves, Geology, & Exploration