芬诺斯坎迪亚中部1.90-1.88Ga弧岩浆作用:芬兰南部深部火山岩地球化学、U-Pb年代学、Sm-Nd和Lu-Hf同位素系统

IF 1.3 4区 地球科学 Q2 GEOLOGY Geologica Acta Pub Date : 2018-01-01 DOI:10.1344/GEOLOGICAACTA2018.16.1.1
Jaakko Kara, M. Väisänen, Å. Johansson, Y. Lahaye, H. O’Brien, O. Eklund
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引用次数: 10

摘要

芬兰南部最早的斯韦芬尼期岩浆活动时间为1.90-1.88Ga。作为一个例子,Orijarvi(约1.89Ga)和Enklinge(约1.88Ga)火山中心由双峰深成岩基组成,周围是年龄和化学成分相当的火山岩。在此,我们报告了侵入和挤压样品的地球化学和Sm-Nd同位素数据,并结合两个研究区花岗闪长岩的锆石U-Pb和Lu-Hf同位素。样品范围从辉长岩到花岗岩,表明与俯冲有关的大陆边缘环境。奥里雅维花岗闪长岩的锆石年龄为1892±4Ma,而恩克林格花岗闪长岩的锆石年龄为1882±6Ma。在恩克林格花岗闪长岩中发现了几个2.25 ~ 1.95 ga的继承年龄和1.86 ~ 1.80 ga的继承年龄。两个地区基性岩的初始e - Nd值均在+1.1 ~ +2.9之间,而长英质岩的初始e - Nd值为-0.4 ~ +1.2。Orijarvi和Enklinge花岗闪长岩岩浆锆石的平均初始e Hf值分别为-1.1 (1892Ma)和0 (1882Ma),分布约为7 e-单位。Enklinge继承锆石的初始Hf值随年龄的增加在+3.5 ~ +7.6之间。Sm-Nd数据表明,基性岩来源于“轻度衰竭”的地幔源,而长英质岩则表现出较大的地壳贡献。此外,e Hf值的变化表明轻度枯竭的地幔源岩浆与地壳源岩浆之间存在少量混合。Enklinge花岗闪长岩中继承锆石的U-Pb年龄和Hf同位素表明,深部存在幼年七芬尼期“原壳”。
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1.90-1.88Ga arc magmatism of central Fennoscandia: geochemistry, U-Pb geochronology, Sm-Nd and Lu-Hf isotope systematics of plutonic-volcanic rocks from southern Finland
The earliest Svecofennian magmatism in southern Finland has been dated at 1.90-1.88Ga. As an example of this, the Orijarvi (ca. 1.89Ga) and Enklinge (ca. 1.88Ga) volcanic centres comprise bimodal plutonic batholiths surrounded by volcanic rocks of comparable ages and chemical compositions. Here, we report geochemical and Sm-Nd isotope data from intrusive and extrusive samples, combined with zircon U-Pb and Lu-Hf isotopes for granodiorites from both study areas. The samples range from gabbros to granites and indicate a subduction-related continental margin setting. The zircons from the Orijarvi granodiorite define an age of 1892±4Ma whereas the Enklinge granodiorite yields an age of 1882±6Ma. Several inherited ages of 2.25-1.95Ga as well as younger ages of 1.86-1.80Ga were found in the Enklinge granodiorite. The initial e Nd values from the mafic rocks from both locations fall in the range +1.1 to +2.9 whereas the felsic rocks exhibit initial e Nd values of -0.4 to +1.2. The magmatic zircons from the Orijarvi and Enklinge granodiorites show average initial e Hf values of -1.1 (at 1892Ma) and zero (at 1882Ma), respectively, each with a spread of about 7 e-units. The initial e Hf values for the inherited zircons from Enklinge range from +3.5 to +7.6 with increasing age. The Sm-Nd data indicate that the mafic rocks were derived from a “mildly depleted” mantle source while the felsic rocks show larger crustal contribution. Also, the variation in e Hf values indicates minor mixing between mildly depleted mantle derived magmas and crustal sources. U-Pb ages and Hf isotopes for inherited zircons in the Enklinge granodiorite suggest the presence of juvenile Svecofennian “proto-crust” at depth.
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来源期刊
Geologica Acta
Geologica Acta 地学-地质学
CiteScore
2.50
自引率
6.70%
发文量
13
审稿时长
>12 weeks
期刊介绍: - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean
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