scholarly journals Magmatic underplating beneath the Rajmahal Traps: Gravity signature and derived 3-D configuration

2004 ◽  
Vol 113 (4) ◽  
pp. 759-769 ◽  
Author(s):  
A. P. Singh ◽  
Niraj Kumar ◽  
Bijendra Singh
Keyword(s):  
Magmatic Underplating ◽  
Rajmahal Traps

Comment and Reply on "Origin of the Rajmahal Traps and the 85°E Ridge: Preliminary reconstructions of the trace of the Crozet hotspot"

Geology ◽  
1992 ◽  
Vol 20 (10) ◽  
pp. 957 ◽  
Author(s):  
R. W. Kent ◽  
M. Storey ◽  
A. D. Saunders ◽  
N. C. Ghose ◽  
P. D. Kempton ◽  
...  
Keyword(s):  
Rajmahal Traps

Crustal velocity structure from SAREX, the Southern Alberta Refraction Experiment

2002 ◽  
Vol 39 (3) ◽  
pp. 351-373 ◽  
Author(s):  
Ron M Clowes ◽  
Michael JA Burianyk ◽  
Andrew R Gorman ◽  
Ernest R Kanasewich
Keyword(s):  
Velocity Structure ◽  
Data Interpretation ◽  
Crustal Thickening ◽  
Tectonic Zone ◽  
Crustal Layer ◽  
Crustal Velocity ◽  
Crustal Velocity Structure ◽  
Southern Alberta ◽  
Magmatic Underplating ◽  
Lower Crustal

Lithoprobe's Southern Alberta Refraction Experiment, SAREX, extends 800 km from east-central Alberta to central Montana. It was designed to investigate crustal velocity structure of the Archean domains underlying the Western Canada Sedimentary Basin. From north to south, SAREX crosses the Loverna domain of the Hearne Province, the Vulcan structure, the Medicine Hat block (previously considered part of the Hearne Province), the Great Falls tectonic zone, and the northern Wyoming Province. Ten shot points along the profile in Canada were recorded on 521 seismographs deployed at 1 km intervals. To extend the line, an additional 140 seismographs were deployed at intervals of 1.25–2.50 km in Montana. Data interpretation used an iterative application of damped least-squares inversion of traveltime picks and forward modeling. Results show different velocity structures for the major blocks (Loverna, Medicine Hat, and Wyoming), indicating that each is distinct. Wavy undulations in the velocity structure of the Loverna block may be associated with internal crustal deformation. The most prominent feature of the model is a thick (10–25 km) lower crustal layer with high velocities (7.5–7.9 km/s) underlying the Medicine Hat and Wyoming blocks. Based on data from lower crustal xenoliths in the region, this layer is interpreted to be the result of Paleoproterozoic magmatic underplating. Crustal thickness varies from 40 km in the north to almost 60 km in the south, where the high-velocity layer is thickest. Uppermost mantle velocities range from 8.05 to 8.2 km/s, with the higher values below the thicker crust. Results from SAREX and other recent studies are synthesized to develop a schematic representation of Archean to Paleoproterozoic tectonic development for the region encompassing the profile. Tectonic processes associated with this development include collisions of continental blocks, subduction, crustal thickening, and magmatic underplating.

scholarly journals Palaeomagnetism of the Rajmahal Traps of India: Implication to the Reversal in the Cretaceous Normal Superchron.

1996 ◽  
Vol 48 (7) ◽  
pp. 993-1000 ◽  
Author(s):  
G. V. S. POORNACHANDRA Rao ◽  
J. MALLIKHARJUNA Rao
Keyword(s):  
Rajmahal Traps

GLIMPCE Seismic reflection evidence of deep-crustal and upper-mantle intrusions and magmatic underplating associated with the Midcontinent Rift system of North America

1990 ◽  
Vol 173 (1-4) ◽  
pp. 595-615 ◽  
Author(s):  
J.C. Behrendt ◽  
D.R. Hutchinson ◽  
M. Lee ◽  
C.R. Thornber ◽  
A. Tréhu ◽  
...  
Keyword(s):  
North America ◽  
Upper Mantle ◽  
Seismic Reflection ◽  
Rift System ◽  
Midcontinent Rift ◽  
Magmatic Underplating ◽  
Midcontinent Rift System

An Early Cretaceous age for the Rajmahal traps, Panagarh area, West Bengal: palynological evidence

2002 ◽  
Vol 23 (6) ◽  
pp. 789-805 ◽  
Author(s):  
Vijaya ◽  
T.K. Bhattacharji
Keyword(s):  
Early Cretaceous ◽  
West Bengal ◽  
Rajmahal Traps

Deep seismic reflection data of EDGE U.S. mid-Atlantic continental-margin experiment: Implications for Appalachian sutures and Mesozoic rifting and magmatic underplating

Geology ◽  
1993 ◽  
Vol 21 (6) ◽  
pp. 563 ◽  
Author(s):  
Robert E. Sheridan ◽  
Douglas L. Musser ◽  
Lynn Glover, III ◽  
Manik Talwani ◽  
John I. Ewing ◽  
...  
Keyword(s):  
Continental Margin ◽  
Seismic Reflection ◽  
Seismic Reflection Data ◽  
Deep Seismic Reflection ◽  
Reflection Data ◽  
Magmatic Underplating

scholarly journals Palaeomagnetism of the-Upper Gondwana-Rajmahal traps, Northeast India

1971 ◽  
Vol 12 (6) ◽  
pp. 449-467 ◽  
Author(s):  
C.T. Klootwijk
Keyword(s):  
Northeast India ◽  
Rajmahal Traps
Sign in / Sign up

Export Citation Format

Share Document