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Greenland Ice Core: Geophysics, Geochemistry, and the Environment Volume 33 by K. C. Jezek; E. A. Roeloffs; L. L. Greischar is a Earth and Planetary Sciences article available to read on EtoBox.

What is Greenland Ice Core: Geophysics, Geochemistry, and the Environment Volume 33 about?

A geophysical survey of subglacial geology was carried out upstream of the Dye 3 borehole in order to characterize bedrock morphology and near-surface crustal structure in an area believed to be close to the boundary between the Archaean craton and the Nagssugtoqidian mobile belt. The survey consisted of radar determinations of bedrock elevation and gravity measurements to be used in estimating near-surface densities. Free-air anomalies are strongly positive (about + 80 regal) and are about 50 mgal higher than the 1 ø x 1 ø mean free-air anomalies determined by satellite measurements. Results of our gravity surveys west of Dye 3, as well as along the EGIG line, suggest the positive anomalies are indicative of an eastward increasing trend in gravity across southern Greenland, perhaps due to regional structure in the crust and mantle rather than to glacial isostasy. The complex bedrock topography in the Dye 3 area was mapped using radar operated from the surface. The effect of bedrock topography on the free-air gravity was modeled in three dimensions using a program based on the method of Talwani and Ewing. The uniform density model of bottom structure that gives the best fit to the

Who reads Greenland Ice Core: Geophysics, Geochemistry, and the Environment Volume 33?

Author

K. C. Jezek; E. A. Roeloffs; L. L. Greischar

Publisher

American Geophysical Union

Published

1985

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)