Cenozoic Structural Evolution and Tectono-Stratigraphic Framework of the Northern Gulf Coast Continental Margin

1995 ◽  
pp. 109-151 ◽  
Keyword(s):  
Continental Margin ◽  
Gulf Coast ◽  
Structural Evolution ◽  
Stratigraphic Framework ◽  
Northern Gulf Coast

scholarly journals Evaluating the segmented post-rift stratigraphic architecture of the Guyanas continental margin

2021 ◽  
pp. petgeo2020-099
Author(s):  
Max Casson ◽  
Jason Jeremiah ◽  
Gérôme Calvès ◽  
Frédéric de Ville de Goyet ◽  
Kyle Reuber ◽  
...  
Keyword(s):  
Continental Margin ◽  
Carbonate Platform ◽  
Organic Geochemistry ◽  
Regional Scale ◽  
Structural Evolution ◽  
Equatorial Atlantic ◽  
Content Type ◽  
Stratigraphic Framework ◽  
Sedimentary Architecture ◽  
Supplementary Material

Segmentation of the Guyanas continental margin of South America is inherited from the dual-phase Mesozoic rifting history controlling the first-order post-rift sedimentary architecture. The margin is divided into two segments by a transform marginal plateau (TMP), the Demerara Rise, into the Central and Equatorial Atlantic domains. This paper investigates the heterogeneities in the post-rift sedimentary systems at a mega-regional scale (>1000 km). Re-sampling seven key exploration wells and scientific boreholes provides new data (189 analysed samples) that have been used to build a high-resolution stratigraphic framework using multiple biostratigraphic techniques integrated with organic geochemistry to refine the timing of 10 key stratigraphic surfaces and three megasequences. The results have been used to calibrate the interpretation of a margin-scale two-dimensional seismic reflection dataset and build megasequence isochore maps, structural restorations and gross depositional environment maps at key time intervals of the margin evolution.Our findings revise the dating of the basal succession drilled by the A2-1 well, indicating that the oldest post-rift sequence penetrated along the margin is late Tithonian age (previously Callovian). Early Central Atlantic carbonate platform sediments passively infilled subcircular-shaped basement topography controlled by underlying basement structure of thinned continental crust. Barremian-Aptian rifting in the Equatorial Atlantic folding and thrusting the Demerara Rise resulting in major uplift, gravitational margin collapse, transpressional structures, and peneplanation of up to 1 km of sediment capped by the regional angular base Albian unconformity. Equatorial Atlantic rifting led to margin segmentation and the formation of the TMP, where two major unconformities developed during the intra Late Albian and base Cenomanian. These two unconformities are time synchronous with oceanic crust accretion offshore French Guiana and in the Demerara-Guinea transform, respectively. A marine connection between the Central and Equatorial Atlantic is demonstrated by middle Late Albian times, coinciding with deposition of the organic-rich source rock of the Canje Formation) (average TOC 4.21 %). The succession is variably truncated by the middle Campanian unconformity. Refining the stratigraphic framework within the context of the structural evolution and segmentation of the Guyanas margin impacts the understanding of key petroleum system elements.Supplementary material:https://doi.org/10.6084/m9.figshare.c.5280490

Birds of Summer Solstice: World-Renewal Rituality on the Northern Gulf Coast of Florida

2019 ◽  
Vol 30 (2) ◽  
pp. 275-293 ◽  
Author(s):  
Joshua M. Goodwin ◽  
Kenneth E. Sassaman ◽  
Meggan E. Blessing ◽  
David W. Steadman
Keyword(s):  
North America ◽  
Gulf Coast ◽  
Fish Bone ◽  
Eastern North America ◽  
Summer Solstice ◽  
First Millennium ◽  
Northern Gulf Coast

Prevalent as bird imagery is in the ritual traditions of eastern North America, the bony remains of birds are relatively sparse in archaeological deposits and when present are typically viewed as subsistence remains. A first-millennium ad civic-ceremonial centre on the northern Gulf Coast of Florida contains large pits with bird bones amid abundant fish bone and other taxa. The avian remains are dominated by elements of juvenile white ibises, birds that were taken from offshore rookeries at the time of summer solstices. The pits into which they were deposited were emplaced on a relict dune with solstice orientations. The timing and siting of solstice feasts at this particular centre invites discussion of world-renewal rituality and the significance of birds in not only the timing of these events but also possibly as agents of balance and rejuvenation.

2020 hurricane impact assessment for the northern Gulf of Mexico: Hurricane Sally and Hurricane Zeta

Shore & Beach ◽  
2021 ◽  
pp. 56-64
Author(s):  
S. McGill ◽  
C. Sylvester ◽  
L. Dunkin ◽  
E. Eisemann ◽  
J. Wozencraft
Keyword(s):  
Change Detection ◽  
Gulf Coast ◽  
Regional Scale ◽  
Shoreline Change ◽  
Airborne Lidar ◽  
Digital Elevation ◽  
The Status ◽  
Northern Gulf Coast ◽  
Elevation Model ◽  
Beach Volume

Regional-scale shoreline and beach volume changes are quantified using the Joint Airborne Lidar Bathymetry Technical Center of Expertise’s digital elevation model products in a change detection framework following the passage of the two landfalling hurricanes, Hurricanes Sally and Zeta, along the northern Gulf Coast in late fall 2020. Results derived from this work include elevation change raster products and a standard set of beach volume and shoreline change metrics. The rapid turn-around and delivery of data products to include volume and shoreline change assessments provide valuable information about the status of the coastline and identification of areas of significant erosion or other impacts, such as breaching near Perdido Key, FL, from Hurricane Sally’s impact. These advanced change detection products help inform sediment budget development and support decisions related to regional sediment management and coastal storm risk management.

Mitigating Impacts of Natural Hazards on Fishery Ecosystems

2008 ◽  
Keyword(s):  
Natural Hazards ◽  
Large Scale ◽  
Gulf Coast ◽  
Commercial Fishing ◽  
Single Beam ◽  
Coastal Bays ◽  
Fishing Vessels ◽  
Northern Gulf Coast ◽  
Hurricanes Katrina And Rita ◽  
Survey Planning

<em>Abstract</em>.—Hurricanes Katrina and Rita critically impacted the northern Gulf Coast. Shrimping and other commercial fishing industries saw large scale destruction of vessels and shore based facilities in addition to a deposition of large amounts of debris on fishing grounds from Alabama to Louisiana. In 2006, the National Oceanic and Atmospheric Administration’s (NOAA’s) Office of Coast Survey and Office of Response and Restoration started the implementation of a large scale hazards survey program to map the coastal waters of Louisiana, Mississippi, and Alabama. The first phase of the effort involved surveying more than 600 square nautical miles of coastal bays and nearshore waters with sidescan and single beam acoustic sonar. Survey findings are posted each week on a NOAA public Web site displaying the location of each hazard and debris found. The survey work is also updating the NOAA navigation charts for coastal areas that are used heavily by fishing vessels, the navigation industry, and recreational boaters. Survey planning and implementation is conducted cooperatively with the marine fisheries agencies of Alabama, Mississippi, and Louisiana.

The Hawasina Nappes: stratigraphy, palaeogeography and structural evolution of a fragment of the south-Tethyan passive continental margin

1990 ◽  
Vol 49 (1) ◽  
pp. 213-223 ◽  
Author(s):  
F. Bechennec ◽  
J. Le Metour ◽  
D. Rabu ◽  
Ch. Bourdillon-de-Grissac ◽  
P. de Wever ◽  
...  
Keyword(s):  
Continental Margin ◽  
Structural Evolution ◽  
Passive Continental Margin ◽  
The South

Multiphase Structural Evolution of a Continental Margin During Obduction Orogeny: Insights From the Jebel Akhdar Dome, Oman Mountains

Tectonics ◽  
2018 ◽  
Vol 37 (3) ◽  
pp. 888-913 ◽  
Author(s):  
A. Grobe ◽  
S. Virgo ◽  
C. von Hagke ◽  
J. L. Urai ◽  
R. Littke
Keyword(s):  
Continental Margin ◽  
Structural Evolution ◽  
Oman Mountains
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