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Zr–LREE rich minerals in residual peraluminous granulites, another factor in the origin of low Zr–LREE granitic melts?

Villaseca González, Carlos and Orejana García, David and Paterson, Bruce A. (2007) Zr–LREE rich minerals in residual peraluminous granulites, another factor in the origin of low Zr–LREE granitic melts? Lithos (Oslo. Print) , 96 . pp. 375-386. ISSN 0024-4937

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Abstract

There is a significant enrichment in some trace elements in the major residual minerals of peraluminous granulite xenoliths from
the lower crust. Those trace elements are released from the breakdown of accessory phases at high-T granulite-facies conditions
(N850 °C). Around 10–35% of Zr is hosted in granulite rutile and garnet, whereas, the entire LREE–Eu budget is controlled by
feldspar. The Zr- and REE-compatible behaviour of the major granulite phases, combined with the scarcity of accessory phases,
which are mostly included in major granulite minerals, leads to a disequilibrium in accessory dissolution in the peraluminous
partial melts. Thus the melt extracts less Zr and LREE and, consequently, generates the false impression of having lower-T when
applying current accessory phase dissolution models.

Item Type:Article
Uncontrolled Keywords:Granite petrogenesis; Zr-undersaturation; Residual minerals; Granulites
Subjects:Sciences > Geology > Petrology
ID Code:12337
Deposited On:02 Mar 2011 12:57
Last Modified:02 Mar 2011 13:00

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