Now showing items 1-6 of 6
Imaging complex structures with semi-recursive Kirchoff migration
Attempting to image the subsurface in areas of complex geology and rapid lateral velocity variation is a challenging problem. In particular, using prestack Kirchhoff migration in conjunction with first arrival travel times ...
Geochemical evidence for island-arc origin of the Villa de Cura Blueschist Belt, Venezuela
New geochemical data from the Villa de Cura indicate that it is a subducted (and exhumed) island-arc terrane. The majority of the basalts are primitive island-arc tholeiites (44.8--51.5 wt% SiO2, 6.7--22.8 wt% MgO). REE ...
Reconstruction of eastern Pacific climate variability using multiple geochemical tracers in Cocos Island corals
Multiple isotopic and geochemical tracers were employed to unravel the complex history of recent environmental variability at Cocos Island. Downcore variations in delta18O, U/Ca, Sr/Ca, and Ba/Ca within coral skeletal ...
A sequence stratigraphic analysis of an Oligocene to Miocene carbonate platform: Beagle and northern Dampier subbasins, Australia
This sequence stratigraphic analysis examines an Oligocene to Miocene carbonate platform from the Northwest Shelf of Australia. Five Oligocene sequences, eleven Miocene sequences and one Pliocene sequence are identified ...
Tectonic and eustatic controls on the evolution of the Maldive carbonate platform
The Maldive Archipelago in the equatorial Indian Ocean is only the uppermost part of a more than 3-km thick carbonate platform. The Maldive platform contains a 50 Ma-long sedimentation record and has a relatively simple ...
Kinematics and visualization of strain in three dimensions
A new computer program for strain visualization has been written. Given an upper triangular deformation tensor, which corresponds to homogeneous deformations where no shearing occurs in the z-direction (assuming a right-handed ...