Isostatic Gravity Map of Eastern Caribbean Region: ABSTRACT

AAPG Bulletin ◽  
1969 ◽  
Vol 53 ◽  
Author(s):  
Sam A. Bush, Patricia A. Bush
Keyword(s):  
Caribbean Region ◽  
Isostatic Gravity ◽  
Eastern Caribbean ◽  
Gravity Map

Isostatic gravity map of the Las Vegas 30 x 60 minute quadrangle, California and Nevada

1999 ◽  
Author(s):  
V.E. Langenheim ◽  
R.I. Morin ◽  
J.G. Davidson ◽  
K.M. Schmidt ◽  
H.R. Blank
Keyword(s):  
Las Vegas ◽  
Isostatic Gravity ◽  
Gravity Map

Assessing the geodynamics of strongly arcuate subduction zones in the eastern Caribbean subduction setting

2020 ◽  
Author(s):  
Menno Fraters ◽  
Wim Spakman ◽  
Cedric Thieulot ◽  
Douwe Van Hinsbergen
Keyword(s):  
Stress Field ◽  
Subduction Zones ◽  
Focal Mechanisms ◽  
North American Plate ◽  
Plate Motion ◽  
Caribbean Region ◽  
The North ◽  
Eastern Caribbean ◽  
Subduction Setting ◽  
Subduction System

<p>The eastern Caribbean Lesser-Antilles subduction system is a strongly arcuate subduction system. We have investigated the dynamics of this system through numerical modelling, demonstrating the developed capabilities and computational feasibility for assessing the 3D complexity and geodynamics of natural subductionsystems and applied this to the eastern Caribbean region. We show the geodynamic feasibility of westward directed trench-parallel slab transport through the mantle, i.e. slab dragging, on the northern segment of the slab, while the eastern segment of the slab is subducting by a mantle-stationary trench. The resistance of the mantle against slab dragging by the North American plate motion, as well as the deformation associated with the arcuate geometry of the slab, creates a complex 3D stress field in the slab that deviates strongly from the classical view of slab-dip aligned orientation of slab stress. More generally this means that the process of slab dragging may reveal itself in the focal mechanisms of intermediate and deep earthquakes. The characteristics of the arcuate subduction such as slab dragging and a complex 3D stress field as studied in the Caribbean region can be more generically applied to other arcuate subduction systems as well, such as the Izu-Bonin-Marianas or the Aleutians-Alaskasystems, where anomalous focal mechanisms of slabs are observed.</p>

scholarly journals The role of arc migration in the development of the Lesser Antilles: A new tectonic model for the Cenozoic evolution of the eastern Caribbean

Geology ◽  
2019 ◽  
Vol 47 (9) ◽  
pp. 891-895 ◽  
Author(s):  
R.W. Allen ◽  
J.S. Collier ◽  
A.G. Stewart ◽  
T. Henstock ◽  
S. Goes ◽  
...  
Keyword(s):  
Large Scale ◽  
Lesser Antilles ◽  
Caribbean Region ◽  
Tectonic Model ◽  
Continental Arc ◽  
Show Evidence ◽  
Geochemical Variations ◽  
Eastern Caribbean ◽  
Two Phases ◽  
Subduction System

Abstract Continental arc systems often show evidence of large-scale migration both toward and away from the incoming plate. In oceanic arc systems, however, while slab roll-back and the associated processes of backarc spreading and arc migration toward the incoming plate are commonplace, arc migration away from the incoming plate is rarely observed. We present a new compilation of marine magnetic anomaly and seismic data in order to propose a new tectonic model for the eastern Caribbean region that includes arc migration in both directions. We synthesized new evidence to show two phases of backarc spreading and eastward arc migration toward the incoming Atlantic. A third and final phase of arc migration to the west subdivided the earlier backarc basin on either side of the present-day Lesser Antilles arc. This is the first example of regional multidirectional arc migration in an intra-oceanic setting, and it has implications for along-arc structural and geochemical variations. The back and forth arc migrations were probably due to the constraints imposed by the neighboring American plates on this isolated subduction system, rather than variations in subducting slab buoyancy.

scholarly journals Isostatic gravity map of the Nevada Test Site and vicinity, Nevada

1988 ◽  
Author(s):  
David A. Ponce ◽  
Reid N. Harris ◽  
Howard W. Oliver
Keyword(s):  
Test Site ◽  
Nevada Test Site ◽  
Isostatic Gravity ◽  
Gravity Map

scholarly journals Isostatic gravity map with simplified geology of the Los Angeles 30 x 60 minute quadrangle

2003 ◽  
Author(s):  
R.J. Wooley ◽  
R.F. Yerkes ◽  
V.E. Langenheim ◽  
F.C. Chuang
Keyword(s):  
Los Angeles ◽  
Isostatic Gravity ◽  
Gravity Map
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