Metamorphic zircon formation at the transition from gabbro to eclogite in Trollheimen–Surnadalen, Norwegian Caledonides

2014 ◽  
Vol 390 (1) ◽  
pp. 403-424 ◽  
Author(s):  
Victoria Beckman ◽  
Charlotte Möller ◽  
Ulf Söderlund ◽  
Fernando Corfu ◽  
Jan Pallon ◽  
...  
Keyword(s):  
Metamorphic Zircon ◽  
Zircon Formation ◽  
Norwegian Caledonides

Oxygen isotopes, REE and U–Pb behaviour during metamorphic zircon formation

2006 ◽  
Vol 70 (18) ◽  
pp. A394
Author(s):  
L. Martin ◽  
S. Duchêne ◽  
E. Deloule ◽  
O. Vanderhaeghe
Keyword(s):  
Oxygen Isotopes ◽  
Metamorphic Zircon ◽  
Zircon Formation

Zr budgets for metamorphic reactions, and the formation of zircon from garnet breakdown

2001 ◽  
Vol 65 (6) ◽  
pp. 749-758 ◽  
Author(s):  
H. Degeling ◽  
S. Eggins ◽  
D. J. Ellis
Keyword(s):  
High Resolution ◽  
Nucleation And Growth ◽  
Metamorphic Rocks ◽  
High Grade ◽  
Metamorphic Zircon ◽  
Temperature Conditions ◽  
Zircon Growth ◽  
Insight Into ◽  
Cordierite Structure ◽  
Zircon Formation

AbstractThe construction of zirconium (Zr) budgets for metamorphic reactions in high-grade rocks provides new insight into zircon growth during metamorphism. In this study we target reactions involving garnet, as they enable zircon growth to be related to known pressure and temperature conditions. Two reactions involving the breakdown of Zr-bearing garnet from Rogaland, SW Norway have been investigated in detail, showing contrasting behaviour of Zr, with zircon formation being subject to the solubility of Zr in product phases. In the decompression reaction garnet + sillimanite + quartz → cordierite, Zr released during garnet breakdown cannot be incorporated into the cordierite structure, resulting in zircon nucleation and growth. In contrast, for the reaction garnet + biotite + sillimanite + quartz → osumilite + orthopyroxene + spinel + magnetite, no new zircon growth takes place, despite the garnet involved containing more than double the Zr concentration of the former reaction. In the latter case, all the Zr released by garnet breakdown can be detected in the product phases osumilite and orthopyroxene, thereby preventing growth of new metamorphic zircon. This study highlights the potential for high resolution geochronology in metamorphic rocks by relating zircon growth to specific metamorphic reactions.

Prograde metamorphic zircon formation in gabbroic rocks: The tale of microtextures

2018 ◽  
Vol 36 (9) ◽  
pp. 1221-1236 ◽  
Author(s):  
Victoria Beckman ◽  
Charlotte Möller
Keyword(s):  
Metamorphic Zircon ◽  
Zircon Formation

The Pikwitonei Granulite Domain, Manitoba: a giant Neoarchean high-grade terrane in the northwest Superior ProvinceThis article is one of a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh.N. Machado, T.E. Krogh, and W. Weber are deceased.

2011 ◽  
Vol 48 (2) ◽  
pp. 205-245 ◽  
Author(s):  
L. M. Heaman ◽  
Ch. O. Böhm ◽  
N. Machado ◽  
T. E. Krogh ◽  
W. Weber ◽  
...  
Keyword(s):  
Granulite Facies ◽  
Superior Province ◽  
High Grade ◽  
Metamorphic Zircon ◽  
Special Issue ◽  
Metamorphic History ◽  
Zircon Growth ◽  
The World ◽  
Northwestern Margin ◽  
History Of

The Pikwitonei Granulite Domain located at the northwestern margin of the Superior Province is one of the largest Neoarchean high-grade terranes in the world, with well-preserved granulite metamorphic assemblages preserved in a variety of lithologies, including enderbite, opdalite, charnockite, and mafic granulite. U–Pb geochronology has been attempted to unravel the protolith ages and metamorphic history of numerous lithologies at three main localities; Natawahunan Lake, Sipiwesk Lake, and Cauchon Lake. The U–Pb age results indicate that some of the layered enderbite gneisses are Mesoarchean (3.4–3.0 Ga) and the more massive enderbites are Neoarchean. The high-grade metamorphic history of the Pikwitonei Granulite Domain is complex and multistage with at least four episodes of metamorphic zircon growth identified: (1) 2716.1 ± 3.8 Ma, (2) 2694.6 ± 0.6 Ma, (3) 2679.6 ± 0.9 Ma, and (4) 2642.5 ± 0.9 Ma. Metamorphic zircon growth during episodes 2 and 3 are interpreted to be regional in extent, corresponding to M1 amphibolite- and M2 granulite-facies events, respectively, consistent with previous field observations. The youngest metamorphic episode at 2642.5 Ma is only recognized at southern Cauchon Lake, where it coincides with granite melt production and possible development of a major northeast-trending deformation zone. The timing and multistage metamorphic history recorded in the Pikwitonei Granulite Domain is similar to most Superior Province high-grade terranes and marks a fundamental break in Archean crustal evolution worldwide at the termination of prolific global Neoarchean greenstone belt formation.

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