@misc{10481/57969,
year = {2018},
month = {8},
url = {http://hdl.handle.net/10481/57969},
abstract = {Zircon of crustal origin found in mantle-derived rocks is of great interest because of the information it
may provide about crust recycling and mantle dynamics. Consideration of this requires understanding
of how mantle temperatures, notably higher than zircon crystallization temperatures, affected the
recycled zircon grains, particularly their isotopic clocks. Since Pb2+ diffuses faster than U4+ and Th+4,
it is generally believed that recycled zircon grains lose all radiogenic Pb after a few million years, thus
limiting the time range over which they can be detected. Nonetheless, this might not be the case
for zircon included in mantle minerals with low Pb2+ diffusivity and partitioning such as olivine and
orthopyroxene because these may act as zircon sealants. Annealing experiments with natural zircon
embedded in cristobalite (an effective zircon sealant) show that zircon grains do not lose Pb to their
surroundings, although they may lose some Pb to molten inclusions. Diffusion tends to homogenize the
Pb concentration in each grain changing the U-Pb and Th-Pb isotope ratios proportionally to the initial
206Pb, 207Pb and 208Pb concentration gradients (no gradient-no change) but in most cases the original
age is still recognizable. It seems, therefore, that recycled crustal zircon grains can be detected, and
even accurately dated, no matter how long they have dwelled in the mantle.},
organization = {This paper has been financed by the Spanish Grants CGL2013-40785-P and
CGL2017-84469-P.},
publisher = {Springer Nature},
title = {Experimental evidence for the preservation of U-Pb isotope ratios in mantle-recycled crustal zircon grains},
doi = {10.1038/s41598-018-30934-4},
author = {Bea Barredo, Fernando and González Montero, María Del Pilar and Molina Palma, José Francisco},
}