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首页> 外文期刊>Contributions to Mineralogy and Petrology >Late-orogenic Sveconorwegian massif anorthosite in the Jotun Nappe Complex, SW Norway, and causes of repeated AMCG magmatism along the Baltoscandian margin
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Late-orogenic Sveconorwegian massif anorthosite in the Jotun Nappe Complex, SW Norway, and causes of repeated AMCG magmatism along the Baltoscandian margin

机译：挪威西南部佐敦纳皮综合体的晚造山史前陆地块斜长岩原位，以及沿巴尔托斯卡纳边缘反复发生AMCG岩浆作用的原因

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摘要

The age and tectonometamorphic history of massif anorthosite in the Jotun Nappe Complex, SW Norway, were investigated by zircon and titanite U–Pb ID-TIMS. The anorthosite contains sparse zircons showing complex U–Pb systematics reflecting events dated at 965 ± 4 and 913 ± 2 Ma, and a pronounced Caledonian metamorphic overprint. The oldest age is interpreted as the protolith age of the massif anorthosite. We propose that the Jotun anorthosite is related to 970–960 Ma magmatism in the Western Gneiss Region and coeval, orogen-perpendicular extension. Conversely, a 930 Ma high-grade metamorphic event in the Jotun Nappe Complex and the related Lindås Nappe is likely related to formation of the autochthonous ca. 930 Ma Rogaland anorthosite complex. We suggest that the two late- to post-orogenic AMCG events reflect two instances of lithospheric foundering below the orogen separated by ca. 20–30 my. The 913 ± 2 Ma metamorphic episode appears to date a heating event restricted to the outermost edge of the Western Gneiss Region. Leucosome formation in high-grade gneisses geographically close to the Jotun anorthosite is dated at 892 ± 4 Ma and suggested to reflect CO2-rich (?) fluid flux along shear zones.
机译：通过锆石和钛矿U-Pb ID-TIMS研究了挪威西南部佐敦纳普复杂的块状钙硅钙铁矿的年龄和构造变质史。钙长石含有稀疏的锆石，显示出复杂的U–Pb系统学，反映了日期为965±4和913±2 Ma的事件，以及明显的古苏格兰变质叠印。最老的年龄被解释为块状钙硅钙石的原生质体年龄。我们认为，佐敦正斜岩与西部片麻岩地区的970-960 Ma岩浆作用和同年龄，造山带垂直延伸有关。相反，佐敦纳皮复杂的930 Ma高变质事件和相关的林道纳皮很可能与自生ca的形成有关。 930 Ma Rogaland钙硅钙石复合体。我们建议这两个造山晚期到造山后的AMCG事件反映了造山带下方由ca分隔开的两个岩石圈形成事件。 20-30我的913±2 Ma变质事件似乎是迄今为止仅限于西部片麻岩地区最边缘的加热事件。在地理上接近佐敦钙铁矿的高级片麻岩中，白质体形成的时间为892±4 Ma，并建议反映沿剪切带的富含CO 2 的流体通量。

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