Time-dependence of the stress shadowing effect and its realtion to the structure of the lower crust

Article Abstract:

Earthquakes generate stress shadows that are time-dependent and can trigger future quakes. These stress shadows delay the occurrence of strong aftershocks as time-dependent post-seismic activities generally transfer from one subparallel strike-slip fault to another. Mantle rheologies affect the degree of post-seismic perturbation. Equally affected by mantle rheologies is tectonic stress, which may decrease after decades following a great earthquake.

Research, Seismic prospecting, Seismic surveying, Earthquake prediction

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Hydrothermal alteration of oxygen isotope ratios phenocrysts, Kidd Creek mine, Ontario: magmatic values preserved zircons

Article Abstract:

An illustration of the differential oxygen isotope exchange during hydrothermal alternation was presented by Elizabeth King and her colleagues who examined oxygen isotope data of zircon and quartz phenocrysts from a sulfide deposit. The data and materials were taken from Kidd Creek volcanic-hosted massive sulfide deposit. The illustration seemed limited to understand magmatic exchanges which occur during hydrothermal alterations.

Analysis, Oxygen, Oxygen isotopes, Magmatism, Zircon, Porphyry, Rhyolite

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18O/16O homogenization of the middle crust during anatexis: the Thor-Odin metamorphic core complex, British Columbia: comment and reply

Article Abstract:

A proposed model for the homogenization of oxygen isotopes in the Thor-Odin metamorphic core complex in British Columbia is questioned on the basis that the model failed to include other investigations documenting hydrothermal fluid flow in the complex. The mineralization in the area proposed by the investigators is also raised as a point of contention. The reply of the proponents of the model is presented.

Natural history, Composition, British Columbia, Rocks, Metamorphic, Metamorphic rocks

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