A Crustal Structure Study of the Northern Margin of the Gulf of Mexico
Author: Harold Gurrola
Publisher:
Published: 1987
Total Pages: 146
ISBN-13:
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Author: Harold Gurrola
Publisher:
Published: 1987
Total Pages: 146
ISBN-13:
DOWNLOAD EBOOKAuthor: Mancheol Suh
Publisher:
Published: 1989
Total Pages: 347
ISBN-13:
DOWNLOAD EBOOKAuthor: Eray Kocel
Publisher:
Published: 2012
Total Pages:
ISBN-13:
DOWNLOAD EBOOKThe end members of passive continental margins are characterized as non-volcanic or volcanic depending on the nature of the transition zone. Differences between these two types are usually reflected by the differences of the physical properties of the Ocean-Continent Transition (OCT). Gravity, magnetic, and seismic data used to investigate the crustal structure of a portion of the northern Gulf of Mexico. Six 800-km long, crustal cross sections have been constructed across the study area with 70 km spacing. Two-dimensional crustal models, comprising 7 layers have been developed to simulate the observed Free-air gravity anomalies. The density of each layer has been kept constant and the geometry of the individual layers modified to obtain a good match to the gravity data. Where possible the gravity models have been constrained by available seismic and magnetic data. Interpretations for the boundaries between different crustal types are delineated by modeling. The magnetic anomalies were used to define the extent of the transitional crust and interpreted as the effects of subaerial flood basalts. For this study OCT was defined as the region where the crustal thickness is greater than 9 km and less than 25 km. The average width of the OCT in the models is 250 km which is greater than that found in previous studies at other volcanic margins. To satisfy concerns that some magnetic anomalies may be due to sea-floor spreading, an alternative model with a narrower transition was constructed which matched the data equally well. In order to reconstruct the pre-extension position of Yucatan the stretched continental crust and transitional zone (restored back to 32 km thickness) across the northern margin, 15° of rotation about a pole south of Florida and 9° further rotation for southern Gulf of Mexico is required. Results from previous studies suggest that the Yucatan Block underwent an additional 20° of rotation due to sea-floor spreading along the restoration arc (total amount of 44° counterclockwise rotation). The results of this thesis supports some previous studies that concluded: (1) the nature of the margin can be classified as being volcanic passive margin and (2) plate reconstructions require counterclockwise rotation for the opening of Gulf of Mexico.
Author: Wade H. Shafer
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 411
ISBN-13: 1461305993
DOWNLOAD EBOOKMasters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 32 (thesis year 1987) a total of 12,483 theses titles from 22 Canadian and 176 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 32 reports theses submitted in 1987, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Author: Wayne Suyenaga
Publisher:
Published: 1989
Total Pages:
ISBN-13:
DOWNLOAD EBOOKAuthor: George Randy Keller
Publisher:
Published: 1980
Total Pages: 125
ISBN-13:
DOWNLOAD EBOOKAuthor: Emeka D. Nwafor
Publisher:
Published: 2013
Total Pages: 60
ISBN-13:
DOWNLOAD EBOOKThe Gulf of Mexico initiated in the Late Triassic as South America and Africa separated from North America during the break up of Pangea. Previous studies indicate three models for the opening of the GOM. These include counter clockwise rotation of the Yucatan Block, rotation of the Yucatan Block about the same pole of rotation as those describing seafloor spreading in the central North Atlantic, and clockwise rotation of the Yucatan Block. There is much debate about the margin type and the crustal structure of the Eastern Gulf of Mexico (EGOM), especially below the depth of 6 km where crustal structure is poorly imaged on seismic reflection data. Two 2.5-D forward gravity and magnetic models across the margin are presented. These are constrained by basement picks from sparse seismic reflection and refraction data, spectral analysis of gravity data to determine the depth to source, magnetic susceptibility derived from results from other margins, the empirical relationship between P-wave velocity and density, and crustal scale isostatic modeling. The models, combined with a kinematic reconstruction of the GOM, show that: 1) it is a rifted margin; 2) the point where the Moho deepens downward from ~17 km to ~32 km is approximately 50 km outboard of the topographic shelf edge; 3) the carbonate bank retreated by several kilometers from its original termination due to the action of contourite currents; 4) extension and subsidence was accommodated with little shallow brittle faulting; 5) oceanic lithosphere is possibly outboard of the EGOM continental slope.
Author: John W. Snedden
Publisher: Cambridge University Press
Published: 2019-11-21
Total Pages: 343
ISBN-13: 110841902X
DOWNLOAD EBOOKA comprehensive and richly illustrated overview of the Gulf of Mexico Basin, including its reservoirs, source rocks, tectonics and evolution.
Author: I. Davison
Publisher: Geological Society of London
Published: 2021-03-25
Total Pages: 560
ISBN-13: 1786204940
DOWNLOAD EBOOKThis volume brings together 17 comprehensive, data-rich analyses to provide an updated perspective on the Mexican Gulf of Mexico, Florida and northern Caribbean. The papers span a broad range of scales and disciplines from plate tectonic evolution to sub-basin scale analysis. Papers are broadly categorised into three themes: 1) geological evolution of the basins of the southern Gulf of Mexico in Mexico, Bahamas and Florida and their hydrocarbon potential; 2) evolution of the region’s Late Cretaceous to Neogene orogens and subsequent denudation history; and 3) geological evolution of the basins and crustal elements of the northern Caribbean. This book and its extensive data sets are essential for all academic and exploration geoscientists working in this area. Two large wall maps are included as fold-outs.