Internal Sm-Nd and Rb-Sr mineral isochron ages range between 53 and 151 Ma.
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The discussion, which will be videotaped, will take place in the Department of Psychology in UNT's Terrill Hall, 1611 W. After the discussion, the partners will complete online questionnaires, with this part of the study taking approximately two hours.
One month and three months after the visit to UNT, the couples will receive additional questionnaires via e-mail to complete and send back to the research team.
Later thermal overprint, fluid activity, and retrogression during exhumation of the eclogites involved (re-)crystallization of amphibole and garnet, thus leading in part to geochronologically poorly interpretable isochrons, without strict time significance.
The last (eo-Alpine) thermal climax, involving static (re-)crystallization of garnet, staurolite and kyanite within the eclogite host rocks, is defined by concordant Sm-Nd and Rb-Sr isochrons on garnet, white mica, and staurolite at around 90 ± 3 Ma.
Whereas the 93 Ma figure may be regarded as a lower age limit for the eclogite event, an upper age limit of ca.
150 Ma may also be inferred for this metamorphism on the basis of these results.
These rocks are encased in polymetamorphic gneisses and micaschists that yield t Pb diagram all samples plot very close to the MORB field.
Most analyses of the major mineral components, garnet, clinopyroxene, zoisite/epidote, phengite, amphibole and rutile, show disequilibrium in all three isotopic systems.
This age is interpreted to date primary magmatic crystallization, thus setting also an uppermost time limit for eclogite metamorphism in the study area.