The outcrop it was taken from is part of a screen of supracrustal rocks intruded by the1. For further background information, see an abstract of Read et al.
The probe data overall are consistent with the isotopic age, but with considerable variability see the data spreadsheet, and the grain maps and images for details. The probe data files have been organized into a spreadsheet modeled on the spreadsheet that Mike supplied that computes the ages. Several improvements have been made:.
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There are clearly age domains within the monazites analyzed from the Rincon Range that when averaged agree reasonably well with the isotopically derived age for these samples. Alternatively, this may imply that the inferred 1.
Monazite geochronology - Wikipedia
The oldest point analysis of Ma sample ARRA-grain 1, point 7 may be due to surface irregularity, a domain boundary, or some other analysis error. This may also be the case for the youngest age of Ma same grain, point 22, very near the outer edge.
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Both the oldest and youngest points appear to be outliers and should probably be ignored in any case. The best hope for finding older monazites in Proterozoic rocks from this and other ranges is likely to be within the cores of M1 garnets and other porphyroblasts.
This will undoubtably be a very fruitful avenue of research for years to come. All of the participants at the workshop very much appreciate the time and energy that Mike Jercinovic put into it.edutoursport.com/libraries/2020-08-07/3050.php
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We look forward to utilizing and improving this exciting new technique! We are a research and service division of: No non-radiogenic lead in monazite or at least very little If you can precisely measure U, Th, and Pb in ppm , you can solve this equation iteratively for lead to obtain an age Map thin section with the microprobe Ce, Fe, Y to find all monazite crystals Map monazite grains Th, Y, U to see chemical domains Measure major elements for matrix corrections Spot analyses Measure: Data analysis download a Kb Excel file The probe data files have been organized into a spreadsheet modeled on the spreadsheet that Mike supplied that computes the ages.
Several improvements have been made: The Homestake shear zone constitutes a classic example of ductile shear-zone reactivation and the development of persistent tectonic zones in the continental lithosphere. Sign In or Create an Account. Close mobile search navigation Article navigation.
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Research Article August 01, Electron-microprobe monazite dating of ca. Origin and early evolution of a persistent intracontinental tectonic zone Colin A. Geology 29 8: Abstract The Homestake shear zone, one of the principal Precambrian structures within the Colorado mineral belt, has a history of tectonism that extends from the Proterozoic to the Tertiary.
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