Crustal Structure And Evolution Beneath The Colorado Plateau And The Southern Basin And Range Province
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Author | : Lamuail Bashir |
Publisher | : |
Total Pages | : 262 |
Release | : 2011 |
Genre | : Earth (Planet) |
ISBN | : |
"Stacking of about 15,500 P-to-S receiver functions recorded at 72 USArray and other broadband seismic stations placed on the Colorado Plateau and the SBRP in Arizona revealed systematic spatial variations in crustal Vp/Vs, crustal thickness and amplitude of P-to-S converted phases. Our results reveal that the BRP is characterized by a thin crust (28.2 ± 0.5 km), a mean Vp/Vs of 1.761 ± 0.014 and a mean amplitude (R) of P - to - S converted wave (relative to that of the direct P wave) of 0.181 ± 0.014 that are similar to a typical continental crust, consistent with the model that the thin crust was the consequence of lithospheric stretching during the Cenozoic. The CP is characterized by the thickest crust (42.3 ± 0.8 km), largest Vp/Vs (1.825 ± 0.009) and smallest R (0.105 ± 0.007) values in the study area. The Colorado Plateau in the study area has the thickest crust and its southern part revealed two layers crustal structure having 12 km thickness of the lower layer. Crust beneath the southern Basin and Range Province is less mafic but thinner than normal continental. The simplest model for the observation is that the Colorado Plateau crust is underlain by a mafic layer which increases both the thickness and Vp/Vs, and decreases the amplitudes of the converted phases by reducing the velocity contrast between the crust and mantle. The results are in general agreement with previous studies (e.g. Frassetto et al., 2006; Gilbert et al., 2007). We hypothesize that the lower crustal layer, which has an anomalously large density as revealed by gravity modeling and high velocities in seismic refraction lines, contributed to the long-term stability and pre-uplift low elevation of the Colorado Plateau in the study area"--Abstract, leaf iv.
Author | : Harlow Grosvenor Farmer |
Publisher | : |
Total Pages | : 140 |
Release | : 1986 |
Genre | : Faults (Geology) |
ISBN | : |
Author | : K.H. Olsen |
Publisher | : Elsevier |
Total Pages | : 511 |
Release | : 1995-11-24 |
Genre | : Science |
ISBN | : 0080529836 |
This multi-author book has been prepared by an international group of geoscientists that have been active in rift research since the late 1960s. In 1984, an informal, grass-roots study group was initiated to compare individual research results and to explore in greater depth the apparent differences and similarities in the interpretations from various rift systems. The group became known as the CREST working group, an acronym of Continental Rifts: Evolution, Structure and Tectonics, which not surprisingly became the title of this book.Continental Rifts: Evolution, Structure, Tectonics presents an overview of the present state of understanding and knowledge of the processes of continental rifting from a multidisciplinary, lithospheric scale perspective. The chapters have been structured on each rift system in approximately the same synoptic sequence, so as to facilitate comparisons of rifts by the reader. The book complements its predecessors by presenting a more unified picture. It succeeds in presenting the status of a representative majority of the continental rift systems that have been at the forefront of recent research. For students and experienced researchers alike, this book will be of significant value in assessing the current state of knowledge and in serving as a framework for future research.
Author | : Bashir Ahmed Durrani |
Publisher | : |
Total Pages | : 240 |
Release | : 1993 |
Genre | : Earth (Planet) |
ISBN | : |
Author | : George Herbert Davis |
Publisher | : Geological Society of America |
Total Pages | : 170 |
Release | : 1999-01-01 |
Genre | : Science |
ISBN | : 9780813723426 |
Author | : Suzanne Mahlburg Kay |
Publisher | : Geological Society of America |
Total Pages | : 292 |
Release | : 2009 |
Genre | : Science |
ISBN | : 0813712041 |
"The American Cordilleras form a continuous orogen that extends for 12,500 km along the eastern flank of the Pacific Ocean from Arctic to Antarctic latitudes as an integral part of the circum-Pacific orogenic belt. Following two summary chapters on the overall anatomy and evolution of North and South American segments of the orogenic system, this volume includes ten seminal chapters dealing with salient aspects of the key geodynamic processes that have accompanied Cordilleran geotectonic evolution: forearc terrane accretion, arc magmatism, shallow subduction, and backarc intracontinental deformation. The papers in this volume were selected from those presented at the 2006 Backbone of the Americas Meeting, which was sponsored jointly by multiple North and South American geological societies in Mendoza, Argentina."--pub. desc.
Author | : Donald L. Baars |
Publisher | : UNM Press |
Total Pages | : 284 |
Release | : 2000 |
Genre | : Nature |
ISBN | : 9780826323019 |
Written with the general reader in mind, this is the updated edition of the classic on the geology of the red rock and canyon country of the Fours Corners region of Utah, Colorado, Arizona, and New Mexico.
Author | : Geological Survey (U.S.) |
Publisher | : |
Total Pages | : 746 |
Release | : 1991 |
Genre | : Geology |
ISBN | : |
Author | : G. Randy Keller |
Publisher | : Geological Society of America |
Total Pages | : 312 |
Release | : 1994-01-01 |
Genre | : Science |
ISBN | : 0813722918 |
Author | : Jeffrey M. Schneider |
Publisher | : |
Total Pages | : 340 |
Release | : 1997 |
Genre | : Earth (Planet) |
ISBN | : |