2635 Ma amphibolite facies gold mineralisation near a terrane boundary (suture?) on Storo, Nuuk region, southern West Greenland

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	2635 Ma amphibolite facies gold mineralisation near a terrane boundary (suture?) on Storo, Nuuk region, southern West Greenland
	Nutman, AP (Nutman, Allen P.); Christiansen, O (Christiansen, Ole); Friend, CRL (Friend, Clark R. L.)
刊名	PRECAMBRIAN RESEARCH
	2007
卷号	159 期号:1-2 页码:19-32
关键词	gold mineralisation archaean terrane assembly archaean storo Greenland
ISSN号	0301-9268
英文摘要	Gold on Storo (in the Nuuk region of southern West Greenland) occurs in a slice of strongly deformed, amphibolite facies, Neoarchaean quartzo-feldspathic metasedimentary rocks and amphibolites in tectonic contact with the Eoarchaean F ae ringehavn terrane and the Meso- to Neoarchaean Akia terrane. The gold is associated with either lollingite (FeAs) + arsenopyrite or pyrrhotite, which belong with the amphibolite facies silicate mineral assemblages. Zircons were U/Pb dated by SHRIMP to constrain the timing of mineralisation. The 2700-2830Ma oscillatory-zoned,high Th/U volcano-sedimentary zircon as whole grains and cores are interpreted to give the maximum depositional age of the rocks hosting the gold. A granite sheet barren of gold that cuts gold mineralised rocks gives an age of ca. 2550 Ma, which is the absolute minimum age of mineralisation. Metamorphic zircons associated with auriferous arsenopyrite (particularly close to secondary lollingite), pyrrhotite and in the coexisting amphibolite facies silicate minerals were dated in situ, in polished thin sections. These have lower average Th/U and yielded dates of ca. 2635 Ma, which is interpreted as the age of the gold-bearing mineral assemblages and hence probably the mineralisation. Supracrustal packages containing abundant quartzo-feldspathic sedimentary rocks with depositional ages of ca. 2800 Ma and metamorphosed at 2650-2600 Ma also occur as folded tectonic intercalations along the western edge of the F ae ringehavn terrane south of Storo. Moreover, in the 3080-2960 Ma Kapisilik terrane to the north and east of Storo, high-grade metamorphic events also occurred between 2650 and 2600 Ma. However, the Eoarchaean F ae ringehavn terrane to the south and east of Storo shows widespread zircon growth and recrystallisation during 2720-2700Ma regional metamorphism, but not at 2650-2600Ma. The Storo gold prospect is thus located near an important tectonic terrane boundary (cryptic suture?) between domains with different Neoarchaean metamorphic history. Storo mineralisation at ca. 2635 Ma probably occurred during deformation of this boundary shortly after it was created, and at Storo maybe was focussed in an area of low strain in a major antiform. The general tectonic frameworks for ca. 2635 Ma gold mineralisation on Storo and in the Yilgam Craton are similar. These gold provinces are compared and contrasted, and the likely reason why so much less gold occurs in the Nuuk region is discussed. (c) 2007 Elsevier B.V. All rights reserved.
学科主题	矿床地质
WOS关键词	ITSAQ GNEISS COMPLEX ; BUKSEFJORDEN REGION ; CONTINENTAL-CRUST ; ISOTOPIC EVIDENCE ; DETRITAL ZIRCONS ; YILGARN CRATON ; OROGENIC GOLD ; ARCHEAN GOLD ; AUSTRALIA ; EVOLUTION
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000250640800002
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/41535]
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 Nunaminerals AS, DK-3900 Nuuk, Greenland
推荐引用方式 GB/T 7714	Nutman, AP ,Christiansen, O ,Friend, CRL . 2635 Ma amphibolite facies gold mineralisation near a terrane boundary (suture?) on Storo, Nuuk region, southern West Greenland[J]. PRECAMBRIAN RESEARCH,2007,159(1-2):19-32.
APA	Nutman, AP ,Christiansen, O ,&Friend, CRL .(2007).2635 Ma amphibolite facies gold mineralisation near a terrane boundary (suture?) on Storo, Nuuk region, southern West Greenland.PRECAMBRIAN RESEARCH,159(1-2),19-32.
MLA	Nutman, AP ,et al."2635 Ma amphibolite facies gold mineralisation near a terrane boundary (suture?) on Storo, Nuuk region, southern West Greenland".PRECAMBRIAN RESEARCH 159.1-2(2007):19-32.