Coarse-grained, clastic sandstone complex at the K/T boundary around the Gulf of Mexico: Deposition by tsunami waves induced by the Chicxulub impact?

1996 ◽  
Author(s):  
J. Smit ◽  
T. B. Roep ◽  
W. Alvarez ◽  
A. Montanari ◽  
P. Claeys ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Coarse Grained ◽  
Tsunami Waves ◽  
Chicxulub Impact

scholarly journals Geochemistry, geochronology and petrogenesis of Maya Block granitoids and dykes from the Chicxulub Impact Crater, Gulf of México: Implications for the assembly of Pangea

2020 ◽  
Vol 82 ◽  
pp. 128-150 ◽  
Author(s):  
Jiawei Zhao ◽  
Long Xiao ◽  
Sean P.S. Gulick ◽  
Joanna V. Morgan ◽  
David Kring ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Impact Crater ◽  
Chicxulub Impact Crater ◽  
Chicxulub Impact

scholarly journals The palaeogeographical background of Late Devonian storm events in the western part of the Holy Cross Mountains (Poland)

Geologos ◽  
2013 ◽  
Vol 19 (4) ◽  
pp. 257-272 ◽  
Author(s):  
Aleksandra Vierek
Keyword(s):  
Coarse Grained ◽  
Late Devonian ◽  
Storm Events ◽  
Diagnostic Features ◽  
Shallow Marine ◽  
Tsunami Waves ◽  
Holy Cross Mountains ◽  
Depositional Systems ◽  
Tsunami Energy ◽  
Carbonate Deposits

Abstract Late Devonian coarse-grained carbonate deposits in the Holy Cross Mountains were studied for possible storm depositional systems and catastrophic tsunami events, as it must be assumed that the investigated area was strongly affected by tropical hurricanes generated in the open ocean North of Gondwana. This assumption appears consistent with diagnostic features of carbonate tempestites at several places in the Holy Cross Mountains. Sedimentary structures and textures that indicate so are, among other evidence, erosional bases with sole marks, graded units, intra- and bioclasts, different laminations and burrowing at the tops of tempestite layers. It has been suggested before that a tsunami occurred during the Late Devonian, but the Laurussian shelf had an extensional regime at the time, which excludes intensive seismic activity. The shelf environment also excluded the generation of tsunami waves because the depth was too shallow. Additionally, the Holy Cross Mountains region was surrounded in the Devonian by shallow-marine and stable elevated areas: the Nida Platform, the Opatkowice Platform and the Cracow Platform to the South, and the elevated Lublin-Lviv area to the NE. Thus, tsunami energy should have been absorbed by these regions if tsunamites would have occurred.

scholarly journals Lake or Estuary? Sedimentary and Benthic Foraminiferal Characterization of a Gulf of Mexico Coastal Dune Lake

2020 ◽  
Vol 31 ◽  
pp. SC46-SC52
Author(s):  
Kaylyn C. Bellais ◽  
Samuel T. Barber ◽  
Donald A. Beebe ◽  
Murlene W. Clark
Keyword(s):  
Gulf Of Mexico ◽  
Gulf Coast ◽  
Scientific Data ◽  
Depositional Environments ◽  
Coastal Dune ◽  
Coarse Grained ◽  
Mobile Bay ◽  
Fine Grained ◽  
Dune Lakes ◽  
Intermittent Connection

Coastal dune lakes are shallow estuaries located within dune environments that share a permanent or intermittent connection with the sea. Because coastal dune lakes are found in few locations worldwide (e.g. Australia, New Zealand, Florida, etc.) they represent unique environments worthy of protection. However; there is a distinct lack of scientific data related to the function and ecology of coastal dune lakes, especially in the Gulf of Mexico. Therefore, the purpose of this study was to characterize the sedimentology and foraminifera of a representative coastal dune lake in Walton County, FL (i.e. Eastern Lake) and determine whether it shares geologic similarities with nearby estuaries. Ten Ekman sediment grab samples were collected along a transect spanning the length of Eastern Lake. The samples were processed to determine sedimentary properties and foraminiferal assemblages. Results from the sedimentary and foraminiferal analyses reveal 3 distinct depositional environments including: (1) a coarse grained, moderately well sorted, organic poor, sandy beach facies with both agglutinated and calcareous foraminifera, (2) a fine grained, very poorly sorted, organic rich central mud basin facies with mostly calcareous foraminifera, and (3) a coarse grained, poorly sorted, organic rich sandy marsh delta facies dominated by agglutinated foraminifera. These environments and foraminiferal patterns are also found in much larger nearby estuaries including Choctawhatchee Bay, Pensacola Bay, and Mobile Bay. Our results therefore suggest that coastal dune lakes may serve as down-scaled micro-estuaries and are functionally related to larger estuaries of the Gulf Coast despite their size.

scholarly journals Insight of in-situ porosity and compressibility of the GC 955 Gulf of Mexico hydrate reservoir

2020 ◽  
Vol 205 ◽  
pp. 11005
Author(s):  
Yi Fang ◽  
Peter B. Flemings ◽  
Hugh Daigle ◽  
Steve C. Phillips ◽  
John T. Germaine
Keyword(s):  
Gulf Of Mexico ◽  
Effective Stress ◽  
Small Difference ◽  
Coarse Grained ◽  
Compression Index ◽  
Hydrate Reservoir ◽  
Sandy Silt ◽  
High Saturation

We characterize the in-situ porosity and compressibility of a coarse-grained hydrate reservoir in Green Canyon Block 955 in the deepwater Gulf of Mexico by performing experiments both on a hydrate-bearing sandy silt pressure core and on the same reservoir material after reconstituting. Uniaxial consolidation experiments demonstrate a small difference in porosity between a reconstituted sandy silt sample (Sh = 0, n = ~ 0.38) and a hydrate-bearing sandy silt (Sh = 83%, n = 0.39-0.40) at in-situ effective stress (3.8 MPa). Both measured porosities generally agree with the in-situ porosity (~0.38 to 0.39) of the reservoir formation that was best-estimated from both LWD and calibrated PCATS densities. The compression index of pressure core at 3.8 MPa is ~ 0.05 to 0.1, slightly stiffer than reconstituted sandy silts (Cc = 0.11). This difference in porosity and compression behaviors between hydrate pressure cores and reconstituted material implies that (1) analysis of reconstituted sediments from hydrate-bearing pressure cores provides a simple and intuitive approach to understand some petrophysical components of the hydrate reservoir; and (2) the high-saturation hydrate in the pores of sediments makes the hydrate reservoir slightly less compressible, suggesting a non-contact-cementing hydrate morphology in the pressure core.

Palynology from ground zero of the Chicxulub impact, southern Gulf of Mexico

Palynology ◽  
2020 ◽  
pp. 1-17
Author(s):  
Vann Smith ◽  
Sophie Warny ◽  
Johan Vellekoop ◽  
Vivi Vajda ◽  
Gilles Escarguel ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Ground Zero ◽  
Southern Gulf Of Mexico ◽  
Chicxulub Impact

Delineation of post-KPg carbonate slope deposits as a sedimentary record of the Paleogene linkage of De Soto Canyon and Suwannee Strait, northern Gulf of Mexico

2016 ◽  
Vol 4 (1) ◽  
pp. SC51-SC61 ◽  
Author(s):  
Keelan F. Umbarger ◽  
John W. Snedden
Keyword(s):  
Gulf Of Mexico ◽  
Drainage System ◽  
Mississippi Canyon ◽  
Long Duration ◽  
History Of ◽  
Carbonate Slope ◽  
Post Impact ◽  
Florida Platform ◽  
Chicxulub Impact ◽  
The Impact

Seismicity generated from the Chicxulub impact has been postulated as the cause for the dramatic alteration of basin margin morphology and catastrophic movement of sediments in the Gulf of Mexico (GOM). Immediately following the impact, the formation of the Cretaceous-Paleogene boundary deposit (KPBD) was widespread and caused considerable erosion as portions of the Florida Escarpment collapsed, inducing sediment failure on the northern Florida Platform and formation of the ancestral De Soto Canyon. Overlying the more prominent KPBD existed a distinct, younger, post-Cretaceous/Paleogene carbonate slope deposit (CSD) confined within the De Soto Canyon bathymetric feature. Presence of this discrete unit provided insight into the post-impact history of De Soto Canyon and its long-duration connection to the Suwannee Strait, which linked the GOM with the Atlantic Ocean for almost 40 ma. We have postulated that the bathymetric low of the De Soto Canyon acted as a conduit for west to east sediment movement from nearby carbonate-dominated shorelines into the canyon in episodic sediment transport events from the Danian to the earliest Miocene. Closure of the Suwannee Strait, due to sediment infilling, terminated deposition of the De Soto Canyon CSD. This was followed by major siliciclastic influx as the paleo-Tennessee drainage system began to enter the Mississippi Canyon area.

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