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Your search keyword '"Corkery, M. Timothy"' showing total 4 results
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4 results on '"Corkery, M. Timothy"'

1. Structural evolution of the Cross Lake greenstone belt in the northwestern Superior Province, Manitoba: implications for relationship between vertical and horizontal tectonism (1,2)

Author

Parmenter, Andrew C., Lin, Shoufa, and Corkery, M. Timothy

Subjects
Canada -- Natural resources, Greenstone belts -- Origin -- Research, Tectonics (Geology) -- Research, Earth sciences, Origin, Research, Natural resources
Abstract

Abstract: Evidence for both vertical and horizontal movement is well preserved in the Cross Lake greenstone belt in the northwestern Superior Province. The vertical movement components are concentrated in high-strain [...]

Published
2006

2. Discovery of pre-3.5 Ga exotic crust at the northwestern Superior Province margin, Manitoba

Author

Bohm, Christian O., Heaman, Larry M., Creaser, Robert A., and Corkery, M. Timothy

Subjects
Canada -- Natural history, Geology, Structural -- Canada, Earth -- Crust, Earth sciences
Abstract

New U-Pb geochronological and Sm-Nd isotopic results across the northwestern margin of the Superior Province in Manitoba, Canada, require a major reinterpretation of the nature, structure, and location of the Superior--Trans-Hudson boundary in the area. A significant finding of this study is that an area northwest of Assean Lake, previously interpreted to be dominantly Early Proterozoic, contains ancient crust. Detrital zircon U-Pb results from two metagraywacke samples in this ancient crustal segment reveal [is greater than or equal to] 3.75 Ga source material, consistent with crustal residence Nd model ages ([T.sub.CR]) of 3.85 and 3.76 Ga, and the U-Pb zircon age for one tonalite gneiss sample is ca. 3.54 Ga ([T.sub.CR] of 3.63 Ga). This newly discovered pre-3.5 Ga crust provides the first evidence for the possible preservation of some very old rocks (pre-3.8 Ga) in this region, older than any known Superior Province crust. Keywords: Superior Province, ancient crust, Early Archean, Manitoba, U-Pb zircon, Sm-Nd.

Published
2000

4. Rapid Modal Analysis of an Amphibolite by Calibrated X-Ray Diffraction Patterns

Author

Corkery, M. Timothy, Schwarcz, Henry P., and None

Subjects
amphibolite, modal, minerals, X-ray, diffraction, calibration
Abstract

A coarse grained amphibolite from the metamorphosed rim of the Whitestone Anorthosite was prepared in several ways for the purpose of determining the modal abundance of the constituent minerals by calibrated X-ray diffraction. A simple two component amphibolite consisting of plagioclase and amphibole was chosen and five major methods of mounting the specimens for X-ray diffraction were employed. It was hoped that a method could be found which would produce randomly oriented, homogeneous samples. A series of such samples each of a different component ratio would then provide a calibration curve from which the mode of a whole rock specimen could be estimated. The calibrated X-ray charts were produced on Philips scanning X-ray diffractometers. The inconsistencies in the results indicate that better technical procedures are required. Thesis Bachelor of Science (BSc)

Published
1972

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