Caledonian nappe correlation and orogenic history in Scandinavia north of lat 67°N
Caledonian nappe correlation and orogenic history in Scandinavia north of lat 67°N
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北纬67°以北斯堪的纳维亚半岛的加里东推覆对比与造山历史
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发表时间：
1978
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通讯作者：
R. Binns
中科院分区：
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作者：
R. Binns
首次尝试对斯堪的纳维亚半岛北部加里东期推覆体进行综合对比。在挪威特罗姆斯的一部分，构造序列比其他地方更完整，其穿过推覆体的地质构成了与东北和西南对比的主要基础。从北纬67°向北划分出7个推覆或推覆杂岩(编号1-7，自下而上)，并与斯堪的纳维亚中部推覆构造进行了可能的对比。强调了地层和构造对比标准。推覆体中含有奥陶纪-志留纪的岩体，与至少部分经历了前志留纪加里东变形和变质的较老岩体交错；还涉及前寒武纪单元，其中一些似乎至少部分未受加里东变形和变质作用的影响。这种交错作用主要与推覆构造有关。大多数推覆体至少向东或东南平移了200至400公里。4~7推覆体的大部分独立运动发生在志留世中、晚志留世变质峰期及之后不久。推覆体3的主要平移发生在晚造山事件。推覆体1和2明显位于推覆体3之前，在奥陶纪之后。
A comprehensive correlation of the Caledonian nappe pile in northern Scandinavia is attempted for the first rime. The geology of a traverse through the nappes in a part of Troms, Norway, where the structural succession is more complete than elsewhere, forms the main basis for correlations to the northeast and southwest. Seven nappes or nappe complexes (designated 1 through 7, from bottom to top) are distinguished regionally from lat 67°N northward, and probable correlations to central Scandinavian nappes are mentioned. Stratigraphic and structural correlation criteria are emphasized. The nappe pile is shown to contain rock bodies of Ordovician-Silurian age interleaved with older ones that have at least partly undergone pre-Silurian Caledonian deformation and metamorphism; Precambrian units, some of which appear to be at least partially unaffected by Caledonian deformation and metamorphism, are also involved. The interleaving is mainly attributed to nappe tectonics. Most nappes were translated at least 200 to 400 km toward the east or southeast. Most independent movement of nappes 4 through 7 took place synmetamorphically during and shortly after the Middle to Late Silurian metamorphic peak. Major translation of nappe 3 occurred as a lateorogenic event. Nappes 1 and 2 were apparently emplaced before nappe 3, after Ordovician time.