Now showing items 21-30 of 307
Asperity distributions and large earthquake occurrence in subduction zones
(Elsevier, 1992-09-30)
Ruff, L.J., 1992. Asperity distributions and large earthquake occurrence in subduction zones. In: T. Mikumo, K. Aki, M. Ohnaka, L.J. Ruff and P.K.P. Spudich (Editors), Earthquake Source Physics and Earthquake Precursors. ...
Sr/Mg ratios of modern marine calcite: Empirical indicators of ocean chemistry and precipitation rate
(Elsevier, 1992-05)
Holocene biotic and abiotic marine calcite have a similar range of Mg contents (0 to 22 and 4 to 21 mol% MgCO3, respectively), yet biotic calcite has Sr2+ concentrations that are consistently 1250 ppm higher than those of ...
Effect of the Cretaceous Serra Geral igneous event on the temperatures and heat flow of the ParanÁ Basin, southern Brazil
(Blackwell Publishing Ltd, 1995-06)
We investigate the effects of the cooling of intrusive and extrusive igneous bodies on the temperature history and surface heat flow of the ParanÁ Basin. The Serra Geral igneous event (130–135 Ma) covered most of this basin ...
The Neoproterozoic (1000-540 Ma) glacial intervals: No more snowball earth?
(Elsevier, 1994-05)
The Neoproterozoic interval (1000-540 Ma) contains ample evidence for a series of glacial intervals. These include the 750-700 Ma Sturtian glaciation, the 625-580 Ma Marinoan-Vendian glaciation and the 600-550 Ma Sinian ...
Genesis and solvus relations of submicroscopically intergrown paragonite and phengite in a blueschist from northern California
(Springer-Verlag, 1991-01)
Electron microbeam techniques have been used to examine submicroscopically intergrown paragonite, phengite and chlorite from the South Fork Mountain Schist of the Franciscan Terrane of northern California, which was subjected ...
Origin and chemical evolution of formation waters from Silurian-Devonian strata in the Illinois basin, USA
(Elsevier, 1991-01)
A suite of formation-water samples from Silurian-Devonian reservoirs in the Illinois basin has been analyzed for major, minor and trace element concentrations and for H, O and Sr isotopic compositions in order to interpret ...
Gold deposition by sulfidation of ferrous Fe in the lacustrine sediments of the Pueblo Viejo district (Dominican Republic): The effect of Fe-C-S diagenesis on later hydrothermal mineralization in a Maar-Diatreme complex
(Elsevier, 1992-09-10)
The Pueblo Viejo district, located in the Cordillera Central of the Dominican Republic, contains large Au-Ag deposits associated with acid-sulfate alteration within spilites, conglomerates and carbonaceous sedimentary rocks ...
Lakes of the Huron basin: their record of runoff from the laurentide ice sheet
(Elsevier, 1994)
The 189,000 km2 Huron basin is central in the catchment area of the present Laurentian Great Lakes that now drain via the St. Lawrence River to the North Atlantic Ocean. During deglaciation from 21-7.5 ka BP, and owing to ...
Strontium isotope geochemistry of late cretaceous granodiorites, Jamaica and Haiti, greater Antilles
(Elsevier, 1979)
Initial 87Sr/86Sr ratios have been determined for a representative suite of Upper Cretaceous granodiorites and associated rocks from the Above Rocks composite stock in central Jamaica and the Terre-Neuve pluton in northwestern ...