Temporal and Hf isotope geochemical evolution of southern Finnish Lapland from 2.77 Ga to 1.76 Ga

IF 1.3 4区 地球科学 Q2 GEOLOGY
L. Lauri, T. Andersen, J. Räsänen, H. Juopperi
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引用次数: 21

Abstract

The southern Finnish Lapland area in the central part of the Fennoscandian shield is a geologically complex zone comprising several Archean blocks and Paleoproterozoic supracrustal belts all of which are intruded by voluminous Paleoproterozoic granites (the central Lapland granitoid complex, CLGC). New in-situ single crystal zircon U–Pb age determinations coupled with Lu–Hf isotope data from the same zircons were acquired from five granitoid rocks and one amphibolitic rock sample from the southern Lapland area. The samples represent at least four distinct magmatic events (at ca. 2.77 Ga, 2.12 Ga, 1.81 Ga, and 1.76 Ga). The 2.77 Ga and the 1.81-1.76 Ga events have initial Hf isotope signatures implying that local Archean rocks represent the source for the younger granites. The 2.12 Ga event has a slightly more juvenile Hf isotope composition suggesting either that the source for the 2.12 Ga granites represents a different Archean block or that the source is composed of mixed Archean and Paleoproterozoic components. The Neoarchean source for the Paleoproterozoic granites may be traced through the CLGC all the way to the Jokkmokk area in Sweden and possibly to the Lofoten area in Norway.
芬兰南部拉普兰2.77 ~ 1.76 Ga时间和Hf同位素地球化学演化
芬兰南部拉普兰地区位于芬诺斯坎迪亚盾中部,是一个由多个太古宙地块和古元古代上地壳带组成的复杂地质带,这些地块均被大量古元古代花岗岩侵入(中央拉普兰花岗岩杂岩,CLGC)。对拉普兰南部地区5个花岗质岩石和1个角闪岩样品进行了原位单晶锆石U-Pb年龄测定,并结合相同锆石的Lu-Hf同位素数据进行了测定。这些样品代表了至少四个不同的岩浆事件(约2.77 Ga, 2.12 Ga, 1.81 Ga和1.76 Ga)。2.77 Ga和1.81 ~ 1.76 Ga事件具有初始Hf同位素特征,表明当地太古宙岩石代表了较年轻花岗岩的来源。2.12 Ga事件的Hf同位素组成略偏年轻,表明2.12 Ga花岗岩的来源可能代表不同的太古宙地块,或者是太古宙和古元古代的混合成分。古元古代花岗岩的新太古代源区可以通过CLGC一直追溯到瑞典的Jokkmokk地区,也可能追溯到挪威的Lofoten地区。
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来源期刊
CiteScore
1.30
自引率
0.00%
发文量
5
审稿时长
>12 weeks
期刊介绍: Bulletin of the Geological Society of Finland (BGSF) publishes research articles and short communications in all branches of geosciences. Contributions from outside Finland are welcome, provided that they contain material relevant to Finnish geology or are of general interest.
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