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Resolving presalt sediment source terrains and dispersal pathways for the northern Gulf of Mexico Basin

Bruce C. Frederick, Mike D. Blum, Chris M. Lowery and John W. Snedden
Resolving presalt sediment source terrains and dispersal pathways for the northern Gulf of Mexico Basin (in Mesozoic of the Gulf rim and beyond; new progress in science and exploration of the Gulf of Mexico Basin, Christopher M. Lowery, John W. Snedden and Norman C. Rosen)
Papers presented at the Gulf Coast Section, Society of Economic Paleontologists and Mineralogists Foundation Annual Bob F. Perkins Research Conference (December 2016) 35: 233-251

Abstract

As part of a larger intercollegiate effort to reconstruct late Triassic, presalt sediment provenance and routing environments for the Gulf of Mexico sedimentary basin, an integrated geochronologic approach leveraging more traditional biostratigraphic, sedimentologic, and sequence stratigraphic provenance constraints from geologic cores, cuttings, and geophysical well logs was initiated. This paper presents the initial results of this ongoing study and details detrital zircon U-Pb extraction methodologies while Inductively Coupled Plasma Mass Spectrometry analyses are pending. Eagle Mills Formation sandstone samples were collected from well core and cuttings, at five sub-crop locations extending from Texas to South Carolina to the West Florida shelf, in preparation for U-Pb detrital zircon provenance analysis. Prior to separation of detrital zircon grains, a sedimentologic-stratigraphic analysis was conducted including detailed core description, well log evaluation, and thin-section petrography assessment. These findings confirm a hypothesis that late Triassic Eagle Mills siliciclastics were derived from the erosion of an active horst-graben rift block topography with associated igneous intrusives. Specifically, preliminary results reveal pervasive very fine-grained mottled gray to red bed sandstone lithology confirming synrift continental alluvium having little or no marine component, and probable deposition in a warm, humid environment but with increasing aridity. Classic fluvial facies features are highlighted including depositional cross strata typifying dynamic braided to meandering channel belts and alluvial floodplain deposits. Less common siltstone and shale lithologies were likely deposited amidst lower energy subfacies including potential shallow lakes, marshes, and/or ephemeral ponds. Bioturbated trace fossils were only rarely preserved, and there was no evidence of marine or eolian facies incursion. Igneous magmatism was prevalent in most subsurface Eagle Mills Formation samples including intrusive diabase, basalt flows, and volcanic ash.


ISSN: 1544-2462
Serial Title: Papers presented at the Gulf Coast Section, Society of Economic Paleontologists and Mineralogists Foundation Annual Bob F. Perkins Research Conference
Serial Volume: 35
Title: Resolving presalt sediment source terrains and dispersal pathways for the northern Gulf of Mexico Basin
Title: Mesozoic of the Gulf rim and beyond; new progress in science and exploration of the Gulf of Mexico Basin
Author(s): Frederick, Bruce C.Blum, Mike D.Lowery, Chris M.Snedden, John W.
Author(s): Lowery, Christopher M.
Author(s): Snedden, John W.
Author(s): Rosen, Norman C.
Affiliation: University of Kansas, Department of Geology, Lawrence, KS, United States
Affiliation: University of Texas at Austin, Institute for Geophysics, Austin, TX, United States
Pages: 233-251
Published: 20161201
Text Language: English
Publisher: Society of Economic Paleontologists, Gulf Coast Section (GCSSEPM) Foundation, Houston, TX, United States
ISBN: 978-1-944966-10-2
Meeting name: 2016 GCSSEPM Perkins-Rosen research conference
Meeting location: Houston, TX, USA, United States
Meeting date: 20161207Dec. 7-9, 2016
References: 40
Accession Number: 2020-013121
Categories: Sedimentary petrologyEconomic geology, geology of energy sources
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 1 table, sketch maps
N28°00'00" - N30°00'00", W90°00'00" - W86°00'00"
Secondary Affiliation: University of Texas at Austin, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute.
Update Code: 202009
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