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The methods have now been published in the AGU Journal G-Cubed (February 2012). 2) New analytical methods developed at the Arizona Laser Chron Center To overcome these limitations we have identified two new well-characterized matrix-matched apatite standards to correct for elemental fractionation and directly measure Hg to allow for common Pb correction without the assumption of concordance. Furthermore, attempts to apply in situ SHRIMP and laser ablation (LA) ICPMS U-Pb techniques on apatite have been hindered by the lack of well-characterized matrix-matched standards to correct for elemental fractionation, as well as by the difficulty in accurately and precisely measuring Pb to provide a robust common lead correction that does not rely on an assumption of concordance.

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Also in agreement are a set of 24 (U–Th–Sm)/He ages recently determined directly on the apatite, which have a mean of 31.02±1.01 Ma 1σ, with a standard error (S.

The distinctive Durango apatite is widely distributed as a reference material for mineralogy, geochemistry and thermochronology.

The apatite occurs within the Cerro de Mercado open-pit iron mine, located in the northern portion of Durango City, Mexico.

The apatite LREE patterns reflect two types of magmas that contributed to this layered magma series.

Apatite from a hybrid allanite-bearing diorite from the Goryczkowa Unit was dated at 340 ± 4 Ma with apatite LREE depletion reflecting the role of allanite and titanite during apatite crystallization.

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