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Filter Total Items: 1749
A mechanism for decoupling within the oceanic lithosphere revealed in the Troodos ophiolite A mechanism for decoupling within the oceanic lithosphere revealed in the Troodos ophiolite
Contrasting kinematic histories recorded in the sheeted dykes and underlying plutonic rocks of the Troodos ophiolite provide a new perspective on the mechanical evolution of oceanic spreading centres. The kinematic framework of the decoupling zone that partitions deformation between the sheeted dykes and plutonics contrasts with low-angle detachment models for slow-spreading ridges based...
Authors
Susan M. Agar, Kim D. Klitgord
Stratigraphy and paleoenvironments of the Shell 410-1 well, Georges Bank Basin, US North Atlantic outer continental shelf Stratigraphy and paleoenvironments of the Shell 410-1 well, Georges Bank Basin, US North Atlantic outer continental shelf
The Shell 410-1 well is the most downdip (seaward) hydrocarbon exploratory well in the Georges Bank Basin. It was drilled to a total depth of 4745 m RKB, and penetrated a section composed of Middle Jurassic to Quaternary sedimentary rocks. The lithostratigraphy of the section is described. The strata penetrated by the Shell 410-1 well are more marine than rocks at the updip (landward)...
Authors
L. J. Poppe, C. W. Poag, B.A. Swift
The impacts of mobile fishing gear on low topography benthic habitats in the Gulf of Maine (Northwest Atlantic): A preliminary report The impacts of mobile fishing gear on low topography benthic habitats in the Gulf of Maine (Northwest Atlantic): A preliminary report
No abstract available.
Authors
Peter J. Auster, Richard J. Malatesta, Richard W. Langton, Les Watling, Andrew N. Shepard, Ivar G. Babb
Decadal and annual changes in biogenic opal and carbonate fluxes to the deep Sargasso Sea Decadal and annual changes in biogenic opal and carbonate fluxes to the deep Sargasso Sea
Analyses of samples from a 14-year series of sediment-trap deployments in the deep Sargasso Sea reveal a significant trend in the ratio of the sinking fluxes of biogenic calcium carbonate and silica. Although there are pronounced seasonal cycles for both flux components, the overall opal/CaCO3 ratio changed by 50% from 1978 to 1991 (largely due to a decrease of opal flux), while total...
Authors
W.G. Deuser, T.D. Jickells, Judith A. Commeau
Silver and other tracers of sewage particles in coastal and deep sea sediments off the east coast, USA Silver and other tracers of sewage particles in coastal and deep sea sediments off the east coast, USA
No abstract available.
Authors
Michael H. Bothner, Marilyn R. Buchholtz ten Brink, G.E. Ravizza
Glacial removal of late Cenozoic subglacially emplaced volcanic edifices by the West Antarctic ice sheet Glacial removal of late Cenozoic subglacially emplaced volcanic edifices by the West Antarctic ice sheet
Local maxima of the horizontal gradient of pseudogravity from closely spaced aeromagnetic surveys over the Ross Sea, northwestern Ross Ice Shelf, and the West Antarctic ice sheet, reveal a linear magnetic rift fabric and numerous subcircular, high-amplitude anomalies. Geophysical data indicate two or three youthful volcanic edifices at widely separated areas beneath the sea and ice cover...
Authors
John C. Behrendt, D. D. Blankenship, D. Damaske, A. K. Cooper
Silurian tectonic history of Penobscot Bay region, Maine Silurian tectonic history of Penobscot Bay region, Maine
Early Paleozoic amalgamation of composite terranes was contemporaneous at widely separated regions that were later accreted to either ancestral North America or to Gondwana as those two continents approached each other. Peri-Gondwanan terranes formed from Late Cambrian and Early Ordovician rocks were amalgamated in the Late Ordovician and Early Silurian to form the Salinic orogenic belt...
Authors
D. B. Stewart, J. D. Unger, D. R. Hutchinson
Beach erosion and coastal development at Rincón, Puerto Rico Beach erosion and coastal development at Rincón, Puerto Rico
No abstract available.
Authors
E. Robert Thieler, Rafael W. Rodriguez, Milton Carlo
Continental climate response to orbital forcing from biogenic silica records in Lake Baikal Continental climate response to orbital forcing from biogenic silica records in Lake Baikal
CHANGES in insolation caused by periodic changes in the Earth's orbital parameters provide the primary forcing for global ice ages1-6. But it is not clear to what extent the climates in continental interiors are controlled directly by regional variations in insolation and to what extent they are driven instead by the highly nonlinear response of the oceans and ice sheets. Here we...
Authors
Steven M. Colman, J.A. Peck, E.B. Karabanov, Susan J. Carter, J.P. Bradbury, J.W. King, D. F. Williams
Rift flank segmentation, basin initiation and propagation: a neotectonic example from Lake Baikal Rift flank segmentation, basin initiation and propagation: a neotectonic example from Lake Baikal
New surficial data (field, Landsat TM and topography) define morpho-tectonic domains and rift flank segmentation in the Ol'khon region of the Central Baikal rift. Deformation, drainage and depositional patterns indicate a change in the locus of active extension that may relate to a recent (
Authors
Susan M. Agar, Kim D. Klitgord
Glacial processes affecting the stratigraphy of the Antarctic Continental Shelf: Results from modeling Glacial processes affecting the stratigraphy of the Antarctic Continental Shelf: Results from modeling
No abstract available.
Authors
Uri S. ten Brink, Christopher Schneider
A synthesis of post-glacial diatom records from Lake Baikal A synthesis of post-glacial diatom records from Lake Baikal
The biostratigraphy of fossil diatoms contributes important chronologic, paleolimnologic, and paleoclimatic information from Lake Baikal in southeastern Siberia. Diatoms are the dominant and best preserved microfossils in the sediments, and distinctive assemblages and species provide inter-core correlations throughout the basin at millennial to centennial scales, in both high and low...
Authors
J. Platt Bradbury, E. Bezrukova, G. Chernyaeva, S.M. Colman, G. Khursevich, J.W. King, Ye. V. Likoshway