Adjacent terranes with ca. 2715 and 2650 Ma high-pressure metamorphic assemblages in the Nuuk region of the North Atlantic Craton, southern West Greenland Complexities of Neoarchaean collisional orogeny

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	Adjacent terranes with ca. 2715 and 2650 Ma high-pressure metamorphic assemblages in the Nuuk region of the North Atlantic Craton, southern West Greenland Complexities of Neoarchaean collisional orogeny
	Nutman, AP (Nutman, Allen P.); Friend, CRL (Friend, Clark R. L.)
刊名	PRECAMBRIAN RESEARCH
	2007
卷号	155 期号:3-4 页码:159-203
关键词	archaean collisional orogeny P-T-t paths zircons Greenland
ISSN号	0301-9268
英文摘要	In the gneiss complex of the Nuuk region of the North Atlantic Craton in southern West Greenland, terrane juxtaposition was followed by Neoarchaean folding under amphibolite facies conditions, with widespread low-pressure recrystallisation (5 kbar and 550-700 degrees C). The complex metamorphic overprinting requires that the P-T history related to actual terrane assembly has to be extracted from very small relicts of older metamorphic assemblages combined with the U/Pb dating, petrology and geochemistry of metamorphic zircons. In the south of the region, the Feeringehavn terrane (Eoarchaean orthogneisses) is tectonically overlain by a supracrustal package of amphibolites and paragneisses (ca. 2840 Ma felsic volcano-sedimentary protoliths). This package is juxtaposed against a higher tectonic level represented by the Tre Brodre terrane (2825 Ma orthogneisses) and the Tasiusarsuaq terrane (2920-2810 Ma orthogneisses). The terranes were assembled by 2710-2720 Ma, as shown by dating of granitic sheets intruded along the terrane boundary mylonites. In the Faeringehavn terrane and in the overlying 2840 Ma supracrustal package, relict early high-pressure assemblages (12-8 kbar, 700-750 degrees C) are clinopyroxene +garnet +plagioclase +quartz +/- hornblende in mafic rocks and garnet + kyanite + rutile bearing assemblages in paragneisses. These are commonly replaced by lower pressure assemblages (7-5 kbar) such as cordierite +/- sillimanite +/- garnet in paragneisses and hornblende + plagioclase + quartz +/- garnet in mafic rocks. In situ partial melting took place during both low- and high-pressure regimes. Metamorphic zircon in the high- and low-pressure assemblages yields dates of ca. 2715 Ma, mostly with errors of <+/- 5 Ma, thereby demonstrating rapid decompression at high temperatures. Zircons in the overlying Tre Brodre and Tasiusarsuaq terranes show little response to the ca. 2715 Ma event supporting structural interpretations that they were at a higher structural level at ca. 2715 Ma. High temperature recrystallisation continued after ca. 2715 Ma, as demonstrated by intergrowth of sillimanite with 2680 Ma metamorphic zircon. The Kapisilik terrane (3050-2960 Ma orthogneisses) and another supracrustal assemblage of amphibolites and ca. 2800 Ma quartzo-feldspathic metasedimentary rocks are exposed north of the Faeringehavn terrane and within fold cores along its western margin, are bounded by folded Neoarchaean mylonites. The Kapisilik terrane and this supracrustal assemblage include high-pressure metamorphic remnants in amphibolites and metasediments (metamorphic segregations with garnet + clinopyroxene and kyanite, respectively) that formed at ca. 2650 Ma. These remnants are overprinted by high temperature, but lower pressure metamorphic events at ca. 2630, 26 10 and 25 80 Ma. Thus remnants of early metamorphism reveal mutually exclusive ca. 2715 and 2650 Ma high-pressure events in adjacent tectonically juxtaposed terranes. Repeated high-pressure metamorphism in adjacent terranes is observed in younger complex collisional orogens. (c) 2007 Elsevier B.V. All rights reserved.
学科主题	变质岩岩石学
WOS关键词	ITSAQ GNEISS COMPLEX ; GRANULITE-FACIES METAMORPHISM ; U-PB ZIRCON ; BUKSEFJORDEN REGION ; GODTHABSFJORD REGION ; CONTINENTAL-CRUST ; FISKENAESSET REGION ; AMPHIBOLITE-FACIES ; ISOTOPIC EVIDENCE ; EVOLUTION
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000247390300001
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/41532]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing SHRIMP Ctr, Beijing 100037, Peoples R China Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia Australian Natl Univ, Dept Earth & Marine Sci, Canberra, ACT 0200, Australia
推荐引用方式 GB/T 7714	Nutman, AP ,Friend, CRL . Adjacent terranes with ca. 2715 and 2650 Ma high-pressure metamorphic assemblages in the Nuuk region of the North Atlantic Craton, southern West Greenland Complexities of Neoarchaean collisional orogeny[J]. PRECAMBRIAN RESEARCH,2007,155(3-4):159-203.
APA	Nutman, AP ,&Friend, CRL .(2007).Adjacent terranes with ca. 2715 and 2650 Ma high-pressure metamorphic assemblages in the Nuuk region of the North Atlantic Craton, southern West Greenland Complexities of Neoarchaean collisional orogeny.PRECAMBRIAN RESEARCH,155(3-4),159-203.
MLA	Nutman, AP ,et al."Adjacent terranes with ca. 2715 and 2650 Ma high-pressure metamorphic assemblages in the Nuuk region of the North Atlantic Craton, southern West Greenland Complexities of Neoarchaean collisional orogeny".PRECAMBRIAN RESEARCH 155.3-4(2007):159-203.