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Sm nd dating garnet

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Official websites use. Share sensitive information only on official, secure websites. Author s C. Dewolf, Cynthia J. Zeissler , A.
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Rare-Earth Clocks, Sm-Nd and Lu-Hf Dating Models: Radioactive Dating, Part 5

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Lutetium–hafnium dating - Wikipedia

In many cases, detrital minerals in sediments represent the only preserved record of long since eroded mountains and continental fragments. However, the available detrital mineral geochronologic archive has important limitations including, importantly, the ability for these minerals to directly constrain tectonic i. This project pioneers the use of detrital garnet Samarium-Neodymium Sm-Nd geochronology as a brand new window into Earth? Garnets grow in response to prograde metamorphism and record the formative portions of mountain building events typically related to continental collision that can be completely missed in the currently dateable detrital mineral archive. Furthermore, by analyzing the well-understood chemistry of a garnet grain, it is possible to place its age into a specific pressure-temperature range and tectonic context wherein it grew e.
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Lutetium–hafnium dating

In a nearby amphibolite, garnets with a two-stage growth history consist of inclusion-rich cores surrounded by discontinuous, inclusion-free overgrowths. These observations confirm the resilience of garnet to diffusive exchange of trace elements during polymetamorphism at amphibolite facies conditions. Our geochronologic results show that metamorphism of arc-derived rocks in western Idaho was episodic and significantly older than in arc rocks along the eastern margin of the Wrangellian Superterrane in British Columbia and Alaska.
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Integrated petrologic and Sm-Nd isotopic studies in garnet amphibolites along the Salmon River suture zone, western Idaho, delineate two periods of amphibolite grade metamorphism separated by at least 16 million years. In a nearby amphibolite, garnets with a two-stage growth history consist of inclusion-rich cores surrounded by discontinuous, inclusion-free overgrowths. Temporal constraints for core and overgrowth development were derived from Sm-Nd garnet — whole rock pairs in which the garnet fractions consist of varying proportions of inclusion-free to inclusion-bearing fragments. These observations confirm the resilience of garnet to diffusive exchange of trace elements during polymetamorphism at amphibolite facies conditions.

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