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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Phanerozoic, pre-Cretaceous thermotectonic events in southern Sweden revealed by fission track thermochronology
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Phanerozoic, pre-Cretaceous thermotectonic events in southern Sweden revealed by fission track thermochronology

机译：裂变径迹热年代学揭示了瑞典南部的生代，白垩纪前热构造事件

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摘要

In shelf areas surrounding southern Sweden, offshore settings contain evidence of repeated subsidence and uplift during the Phanerozoic. Earlier published fission track (FT) studies in adjacent areas suggest extensive exhumation since the Late Paleozoic. The aim of this study is to reveal pre-Cretaceous thermotectonic events that affected the south-central part of the Fennoscandian Shield. Twenty-four apatite samples from the Precambrian basement in southern Sweden were analyzed by the FT dating method. The samples were collected at the present-day crustal surface, which more or less coincides with a sub-Cambrian paleosurface. Apatite FT ages range between ～150 and ～315 Ma, and the mean track lengths range between ～12.3 and ～13.6 μm. Together, the FT results confirm that all samples from southern Sweden were totally annealed, i.e. heated above at least 100 ℃, during the Phanerozoic. Furthermore, three areas with different trends among the FT results have been discerned. FT ages younger than 200 Ma are characteristic for samples from the southeast. A large discrepancy among the FT results is recorded in the northwest. In between, a belt with 230-280 Ma ages is distinguished. A tentative reconstruction of the pre-Cretaceous thermotectonic history in the southern Fennoscandian Shield suggests that Caledonian foreland basin deposits were responsible for the Palaeozoic heating event that affected southern Sweden. Tectonic vertical movements in the basement were probably triggered by the load, resulting in a depth differentiation in the basin. Cooling of southern Sweden took place during the Carboniferous-Middle Triassic due to uplift and exhumation of the southwestern part of the shield. Subsequent Jurassic exhumation is recorded in southeastern and parts of northwestern south Sweden.
机译：在瑞典南部周围的陆架地区，近海环境包含了古生代反复沉陷和隆升的证据。早先在邻近地区发表的裂变径迹（FT）研究表明，自古近代以来广泛的掘尸活动。这项研究的目的是揭示影响白垩纪前盾构南中部的白垩纪前热构造事件。通过FT测年方法分析了瑞典南部前寒武纪地下室的二十四个磷灰石样品。样品是在现今的地壳表面收集的，该表面或多或少与一个寒武纪古表面相吻合。磷灰石的FT年龄在〜150至〜315 Ma之间，平均磁道长度在〜12.3至〜13.6μm之间。 FT结果共同证实，在生代时代，所有来自瑞典南部的样品均已完全退火，即加热到至少100℃以上。此外，我们发现了金融时报结果中三个趋势不同的领域。 FT年龄小于200 Ma是东南部样品的特征。 FT结果之间的差异很大，记录在西北。在这两者之间，有一个230-280 Ma年龄的带。 Fennoscandian Shield南部南部白垩纪前热构造历史的初步重建表明，加里东前陆盆地沉积物是影响瑞典南部的古生代加热事件的原因。地下构造的垂直运动可能是由载荷触发的，导致盆地的深度差异。由于盾构西南部的隆起和发掘，石炭纪-中三叠纪发生了瑞典南部的降温。随后在瑞典的东南部和西北部的西北部分地区记录了侏罗纪的掘尸活动。

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