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首页> 外文期刊>Tectonics >Thermochronology and Exhumation History of the Northeastern Fennoscandian Shield Since 1.9 Ga: Evidence From ~(40)Ar/~(39)Ar and Apatite Fission Track Data From the Kola Peninsula
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Thermochronology and Exhumation History of the Northeastern Fennoscandian Shield Since 1.9 Ga: Evidence From ~(40)Ar/~(39)Ar and Apatite Fission Track Data From the Kola Peninsula

机译：1.9 Ga以来东北芬诺斯坎迪斯盾的热年代学和发掘历史：来自〜（40）Ar /〜（39）Ar的证据和可乐半岛的磷灰石裂变径迹数据

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摘要

Results from thermochronological studies have multiple applications to various problems in tectonics and landform evolution. However, up to now a lack of thermochronological data from the northeastern Fennoscandian Shield has complicated the interpretation of tectonothermal evolution of the region. Here, we use both new and previously published multimineral Ar-40/Ar-39 data (amphibole, mica, and feldspar) on the various Precambrian magmatic and metamorphic complexes to reconstruct the thermal history of NE Fennoscandia within the Kola Peninsula area in the interval 1900-360 Ma. Using the apatite fission track method as well as a numerical model of the heating-cooling process of northeastern Fennoscandia's upper crust, we have reconstructed its thermal evolution for the interval 360-0 Ma. According to our model, since Lapland-Kola orogenesis (1930-1905 Ma) northeastern Fennoscandia experienced a quasi-monotonous cooling with the average rate of 0.15 degrees C/Myr, which is equal to an exhumation rate of 1-2 m/Myr. New apatite fission track data and time-temperature modeling reveal a hidden endogenous thermal event in the NE Fennoscandia that took place between 360 and 300 Ma. This we attribute to an elevated geothermal gradient due to Baltica's drift over the African large low shear-wave velocity province in the lowest mantle and/or thermal blanketing by insulating Devonian-Carboniferous sedimentary/volcanic cover. Our model is further supported by evidence of Late Devonian-Carboniferous rifting in the East and South-Western Barents Basin, as well as various 360-300 Ma magmatic events within SW Fennoscandia and the Baltic countries.
机译：热年代学研究的结果对构造学和地貌演化的各种问题有多种应用。但是，到目前为止，东北部的芬诺斯堪的纳海盾缺乏热年代学数据，这使该地区构造热演化的解释变得复杂。在这里，我们使用新的和先前发布的多矿物Ar-40 / Ar-39数据（闪石，云母和长石）在前寒武纪的岩浆和变质复合体上重建了科拉半岛区域内NE芬诺斯坎迪亚的热史。 1900-360马。利用磷灰石裂变径迹方法以及东北Fennoscandia上地壳加热-冷却过程的数值模型，我们重建了其在360-0 Ma区间的热演化。根据我们的模型，自拉普兰-科拉造山运动（1930-1905 Ma）以来，芬诺斯堪的亚东北部经历了准单调冷却，平均速率为0.15摄氏度/米尔，这等于1-2 m /米尔的掘尸速率。新的磷灰石裂变径迹数据和时间-温度模型揭示了NE Fennoscandia中隐藏的内生热事件，发生在360至300 Ma之间。这归因于波罗的海在最低的地幔中在非洲大的低剪切波速度省上的漂移和/或通过隔热泥盆纪-石炭纪沉积/火山覆盖而进行的热覆盖，导致地热梯度升高。东部和西南部巴伦支盆地晚泥盆世-石炭纪裂谷的证据，以及西南部芬诺斯坎迪亚和波罗的海国家发生的各种360-300 Ma岩浆事件，进一步证明了我们的模型。

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  • 来源
    《Tectonics》 |2019年第8期|2317-2337|共21页
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    Lomonosov Moscow State Univ Geol Fac Moscow Russia|Russian Acad Sci Inst Phys Earth Moscow Russia;

    Univ Arizona Dept Geosci Tucson AZ 85721 USA;

    Russian Acad Sci Inst Precambrian Geol & Geochronol St Petersburg Russia|St Petersburg State Univ Inst Earth Sci St Petersburg Russia;

    Univ Tubingen Dept Geosci Tubingen Germany;

    Russian Acad Sci Siberian Branch Sobolev Inst Geol & Mineral Novosibirsk Russia|Novosibirsk State Univ Dept Geol & Geophys Novosibirsk Russia;

    Russian Acad Sci Inst Geol Ore Deposits Petrog Mineral & Geochem Moscow Russia;

    Russian Acad Sci Karelian Res Ctr Inst Geol Petrozavodsk Russia;

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  • 关键词

    Fennoscandia; Kola Peninsula; Ar; Ar dating; apatite fission track; thermal history; tectonics;

    机译：芬诺斯堪的亚;科拉半岛;Ar;Ar约会;磷灰石裂变径迹热历史;构造学;

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