SmNd and LuHf geochronology - PowerPoint PPT Presentation

※ Download: Lu-hf garnet dating

That's all free as well! The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. Permission is hereby granted to the author s of this abstract to reproduce and distribute it freely, for noncommercial purposes.

Contractional and transpressional deformation occurred throughout much of the North American Cordillera at this time, from southeastern Alaska to the Baja Peninsula in Mexico. Earth and Planetary Science Letters. Light blue particles represent volatile elements, which will not condensate during early Earth formation.

SmNd and LuHf geochronology - PowerPoint PPT Presentation - In order to place our samples in a regional tectonic context we compare our results to patterns of regional deformation, metamorphism and plutonism throughout the North American Cordillera in the time period between 110 and 85 Ma. Positive value would be found in the residue solid after melt extraction, as the liquid would be enriched in Hf.

Dating subduction metamorphism along prograde and retrograde paths in order to constrain such processes, however, has proved to be extremely difficult. In addition, the closure temperature for Lu—Hf in garnet and lawsonite should be sufficiently high that an age will date mineral crystallization and therefore the timing of subduction zone metamorphism. The relative stability and timing of garnet and lawsonite formation will be controlled by the bulk composition, peak metamorphic conditions and shape of the P— T path experienced by a particular sample. In the Franciscan Complex, the ages of garnet—epidote amphibolite, garnet—epidote blueschist, garnet—lawsonite blueschist and lawsonite blueschist range from c. Lower temperature lawsonite blueschist at Ward Creek, however, failed to provide a geologically significant date and likely reflects isotopic disequilibrium at low temperatures. The apparent temperature—time history from Franciscan Complex Lu—Hf ages most likely reflects samples derived from various portions of the subduction zone or that were subducted and metamorphosed at different times in the thermal evolution of the subduction zone. In the Sivrihisar Massif, lawsonite eclogite and garnet—lawsonite blueschist record distinctly different ages of 91. Hinsbergen, Marco Maffione, Alexis Plunder, Nuretdin Kaymakcı, Morgan Ganerød, Bart W. Hendriks, Fernando Corfu, Derya Gürer, Giovanni I. Gelder, Kalijn Peters, Peter J. Vissers, Tectonic evolution and paleogeography of the Kırşehir Block and the Central Anatolian Ophiolites, Turkey , Tectonics , 35 , 4 , 983-1014 , 2016.

Hafnium
Left-lateral transpression dominated the Canadian Cordillera, whereas, right-lateral transpression affected areas south of the Idaho—Salmon River suture zone, including the Sierra Nevada batholith. The technique of isotope dilution is often necessary for precise determination of concentrations. For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. A linear relationship would be obtained. In understanding metamorphic rocks, Lu—Hf can still provide information of origin. Plot of Lu concentration v.