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Filter Total Items: 1749
Patterns of late Cenozoic volcanic and tectonic activity in the West Antarctic rift system revealed by aeromagnetic surveys Patterns of late Cenozoic volcanic and tectonic activity in the West Antarctic rift system revealed by aeromagnetic surveys
Aeromagnetic surveys, spaced ≤5 km, over widely separated areas of the largely ice- and sea-covered West Antarctic rift system, reveal similar patterns of 100- to 1700-nT, shallow-source magnetic anomalies interpreted as evidence of extensive late Cenozoic volcanism. We use the aeromagnetic data to extend the volcanic rift interpretation over West Antarctica starting with anomalies over...
Authors
John C. Behrendt, R. Saltus, D. Damaske, A. McCafferty, C. A. Finn, D. Blankenship, R.E. Bell
Osmium isotopes and silver as tracers of anthropogenic metals in sediments from Massachusetts and Cape Cod bays Osmium isotopes and silver as tracers of anthropogenic metals in sediments from Massachusetts and Cape Cod bays
High concentrations of osmium (Os) and silver (Ag) and low 187Os/186Os ratios in Boston sewage make these elements sensitive tracers of the influence of sewage on marine sediments in Massachusetts and Cape Cod bays. Pristine marine sediments have Ag concentrations more than 200 times lower than sewage sludge, Os concentrations 10-40 times lower, and 187Os/186Os ratios six times higher...
Authors
G.E. Ravizza, Michael H. Bothner
A review of the tectonic problems of the strike-slip northern boundary of the Caribbean Plate and examination by GLORIA A review of the tectonic problems of the strike-slip northern boundary of the Caribbean Plate and examination by GLORIA
No abstract available.
Authors
William P. Dillon, N. Terence Edgar, Kathryn M. Scanlon, Dwight F. Coleman
Analysis of the mobility of far reaching debris flows on the Mississippi Fan, Gulf of Mexico Analysis of the mobility of far reaching debris flows on the Mississippi Fan, Gulf of Mexico
No abstract available.
Authors
J. Locat, H. J. Lee, H.C. Nelson, W. C. Schwab, D.C. Twichell
Silt heavy-mineral distributions off the Southeastern United States Silt heavy-mineral distributions off the Southeastern United States
Until recently heavy-mineral studies of marine sediments were largely restricted to sand fractions. New techniques permitting analysis of decalcified silt fractions have been applied to sediments off the southeastern United States. Our data, which confirm predictions from the basic relationship among grain size, specific gravity, and equivalent hydraulic transport behavior, show that
Authors
L. J. Poppe, J.A. Commeau
High-resolution seismic-reflection surveys of Lake Baikal, Siberia, 1990-1992 High-resolution seismic-reflection surveys of Lake Baikal, Siberia, 1990-1992
No abstract available.
Authors
Steven M. Colman, D. S. Foster, Josephine Hatton
Uranium-series disequilibrium, sedimentation, diatom frustules, and paleoclimate change in Lake Baikal Uranium-series disequilibrium, sedimentation, diatom frustules, and paleoclimate change in Lake Baikal
The large volume of water, approximately one-fifth of the total surface fresh water on the planet, contained in Lake Baikal in southeastern Siberia is distinguished by having a relatively high concentration of uranium (ca. 2 nM), and, together with the surface sediments, an unusually high234U238U alpha activity ratio of 1.95. About 80% of the input of uranium to the lake, with a234U238U...
Authors
D.N. Edgington, J. A. Robbins, Steven M. Colman, K.A. Orlandini, M.-P. Gustin
Sediment mass-flow processes on a depositional lobe, outer Mississippi Fan Sediment mass-flow processes on a depositional lobe, outer Mississippi Fan
SeaMARC 1A sidescan-sonar imagery and cores from the distal reaches of a depositional lobe on the Mississippi Fan show that channelized mass flow was the dominant mechanism for transport of silt and sand during the formation of this part of the fan. Sediments in these flows were rapidly deposited once outside of their confining channels. The mass flows most likely originated from slope...
Authors
W. C. Schwab, H.J. Lee, D.C. Twichell, J. Locat, C.H. Nelson, W.G. McArthur, Neil H. Kenyon
Sedimentary processes in a tectonically active region: Puerto Rico north insular slope Sedimentary processes in a tectonically active region: Puerto Rico north insular slope
No abstract available.
Authors
Kathryn M. Scanlon, Douglas G. Masson
Morphology of carbonate escarpments as an indicator of erosional processes Morphology of carbonate escarpments as an indicator of erosional processes
No abstract available.
Authors
David C. Twichell, William P. Dillon, Charles K. Paull, Neil H. Kenyon
Open-ocean boundary conditions from interior data: Local and remote forcing of Massachusetts Bay Open-ocean boundary conditions from interior data: Local and remote forcing of Massachusetts Bay
Massachusetts and Cape Cod Bays form a semienclosed coastal basin that opens onto the much larger Gulf of Maine. Subtidal circulation in the bay is driven by local winds and remotely driven flows from the gulf. The local-wind forced flow is estimated with a regional shallow water model driven by wind measurements. The model uses a gravity wave radiation condition along the open-ocean...
Authors
P.S. Bogden, P. Malanotte-Rizzoli, R. Signell
Amplitude blanking in seismic profiles from Lake Baikal Amplitude blanking in seismic profiles from Lake Baikal
Imaging of the deepest sedimentary section in Lake Baikal using multichannel seismic profiling was hampered by amplitude blanking that is regionally extensive, is associated with water depths greater than about 900 m and occurs at sub-bottom depths of 1-2 km in association with the first water-bottom multiple. Application of a powerful multiple suppression technique improved the quality...
Authors
Myung W. Lee, Warren F. Agena, D. R. Hutchinson