Crustal structure of the Texas gulf coast

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Title: Crustal structure of the Texas gulf coast
Author: Keller, G. Randy
Abstract: The coastal region of Texas is a zone of transition from oceanic structure in the Gulf of Mexico to continental structure in central Texas . Knowledge of crustal structure in this region is necessary to understand the tectonic history of the coastal region of Texas , the Ouachita system , and the Gulf of Mexico . Gravity measurements were made and combined with measurements from earlier studies to produce a gravity map of the coastal region of Texas . These data were interpreted by computer modeling , and analysis of the data suggests that the . crust thins and the sedimentary column thickens from central Texas toward the coast . The buried core of the Ouachita system has a distinct positive gravity signature , and gravity profiles suggest that the same general crustal structure exists through much of the Texas coastal region . Two tripartite arrays of vertical long -period seismographs were deployed for study of Rayleigh wave propagation in the coastal region of Texas . Analysis of Rayleigh wave group -velocity dispersion in the Rio Grande Embayment area suggests that thick Paleozoic , as well as thick Mesozoic and Cenozoic , sediments are present . 7JDsence of a typical granitic layer is also suggested . The model proposed for this area is a crust 32 km thick composed of 12 km of basaltic material and 20 km of sedimentary rocks . The second tripartite was deployed in the area of the central Texas Gulf Coast . The model proposed for this area is a crust 31 .5 km thick composed of 13 .5 km of basaltic material , 5 km of Mesozoic and Cenozoic sediments , and 9 . km of Paleozoic rocks which are in part of igneous origin . The combination of geological data , gravity data , previous seismic refraction studies , and Rayleigh wave dispersion data suggests a generalized crustal model which is valid all along the Texas Gulf Coast . The generalized model is b€ :F :t explained by interpreting the Ouachita system . as a Paleozoic -Cordilleran type mountain belt and the Texas Gulf Coast as the site of the Paleozoic subduction zone .
URI: http : / /hdl .handle .net /2346 /14211
Date: 1973-05

Citation

Crustal structure of the Texas gulf coast. Doctoral dissertation, Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /14211 .

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