Rare-earth patterns in zircons from the Manaslu granite and Tibetan Slab migmatites (Himalaya) : insights in the origin and evolution of a crustally-derived granite magma

The Composition of Zircon and Igneous and Metamorphic Petrogenesis

“…Perhaps more important is the further assumption one must make when using D element values, which is that equilibrium trace-element partitioning governs the abundance of trace-elements in zircon. It is suspected however, that disequilibrium partitioning is normal for zircon (Watson and Liang 1995, Barbey et al 1995, Watson 1996b. Moreover, the partitioning of REE, Y and P into zircon appears to be limited not so much by melt composition or cation diffusion, but by intracrystalline strain imposed by cation substitution .…”

“…Hoskin (1998) reported Ce abundances in zircon from MARID xenoliths from South Africa, range 3 to 160 ppm, which almost span the range of Ce abundances reported for all other zircon occurrences (e.g., Hinton and Upton 1991, Barbey et al 1995, Guo et al 1996, Poller et al 2001, Ballard et al 2002, de la Rosa et al 2002, Sano et al 2002. Most analyses of igneous zircon report Ce abundances less than about 50 ppm.…”

“…Inter-grain order-of-magnitude variation of U and Th has long been observed during isotopic analysis of zircon populations (e.g., Black et al 1986, Chen and) and large variations are also typically observed for the REE and Y. For example, plagiogranite zircon from eastern Australia has Y abundances ranging from 399 to 3506 ppm (Hoskin and Ireland 2000) and Himalayan granitic leucosome zircon (sample MB301L) has Yb values ranging from 409 to 2215 ppm (Barbey et al 1995). Poller et al (2001) measured Y abundances in granitoid zircon (sample 1053 excluding cores) ranging from 500 to 4534 ppm and also reported near order-ofmagnitude variation of REE and Y within an oscillatory zoned region of a single crystal (crystal 1032-8; analysis 1: ΣREE 328 ppm, Y 442 ppm; analysis 2: ΣREE 2830 ppm, Y 3420 ppm).…”

“…The abundance of Zr in meteorites ranges <4 ppm (chondrites) to 70 ppm (eucrites) and zircon has only been reported for a few occurrences. Ireland and Wlotzka (1992) were first to report in situ analyzed REE abundances and patterns of zircon from two meteorites, the Vaca Muerta mesosiderite Meyer 1991, Snyder et al 1993); (c) kimberlite and carbonatite zircon (Hoskin and Ireland 2000); (d) zircon from Blind Gabbro, Australia, and Mawson igneous charnockite, Antarctica (Hoskin and Ireland 2000); (e) ophiolite and plagiogranite zircon (Hoskin and Ireland 2000); (f) zircon from two zones, diorite and aplite, of the Boggy Plain Zoned Pluton, BPZP ; (g) Torihama dacite pumice, Japan (Sano et al 2002); (h) zircon from sample NL102 of the Manaslu granite, Tibet (Barbey et al 1995); (i and j) zircon from the Chuquicamata West porphyry and Los Picos diorite, Chile (Ballard et al 2002); (k) zircon from corundum-bearing syenitic xenoliths, Elie Ness and Ilmen syentie (Hinton and Upton 1991); (l) Hadean zircon (4.0-4.15 Ga) from Jack Hills metaconglomerate W74, Australia . All data are replotted from the original source and normalized to the chondrite values of McDonough and Sun (1995).…”

Petrogenesis of Ordovician Magmatism in the Pyrenees (Albera and Canigó Massifs) Determined on the Basis of Zircon Minor and Trace Element Composition

“…In recent years, a large number of compositional studies of zircon have been undertaken to define reliable chemical discriminants and link zircon composition with its host rock (e.g., Murali et al 1983;Heaman et al 1990;Hinton and Upton 1991;Ireland and Wlotzka 1992;Barbey et al 1995;Belousova et al 1998;Hoskin 1998). Such discriminants could be especially useful in detrital zircon Manuscript received March 29, 2010;accepted April 27, 2011. * Author for correspondence; e-mail: castigar@geo.ucm.es.…”