Structural complexity at and around the Triassic–Jurassic GSSP at Kuhjoch, Northern Calcareous Alps, Austria
Structural complexity at and around the Triassic–Jurassic GSSP at Kuhjoch, Northern Calcareous Alps, Austria
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奥地利北钙质阿尔卑斯山 Kuhjoch 三叠纪-侏罗纪 GSSP 及其周围的结构复杂性
DOI：
10.1007/s00531-017-1450-4
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发表时间：
2017
影响因子：
2.3
通讯作者：
Ágoston Sasvári
中科院分区：
文献类型：
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作者：
M. Palotai;J. Pálfy;Ágoston Sasvári
全球层型剖面和点（GSSP）的关键要求之一是没有构造干扰。最近在奥地利北方石灰质阿尔卑斯山的Kuhjoch确定了三叠纪-侏罗纪系统边界的GSSP。在三叠纪-侏罗纪边界GSSP现场的新的实地观察表明，翻转，紧密，几乎直立的卡温德尔向斜形成在半脆性变形条件下，证实了轴向平面叶理。不同规模的紧等斜褶皱与向北的构造搬运有关。脆性断层发生在褶皱之前和之后，并通过倾斜试验（平均层理的结构数据旋转）证实。叶理普遍存在于无能单元中，包括GSSP的Kendlbach组。逆断层（推测为褶皱前形成的正断层）横切GSSP剖面，导致Schattwald层的部分构造遗漏，因此无法测量整个Kendlbach组的完整连续地层剖面。根据这些观察结果，Kuhjoch剖面不符合GSSP关于边界水平附近没有构造扰动的具体要求。
One of the key requirements for a Global Stratotype Section and Point (GSSP) is the absence of tectonic disturbance. The GSSP for the Triassic–Jurassic system boundary was recently defined at Kuhjoch, Northern Calcareous Alps, Austria. New field observations in the area of the Triassic–Jurassic boundary GSSP site demonstrate that the overturned, tight, and almost upright Karwendel syncline was formed at semibrittle deformation conditions, confirmed by axial planar foliation. Tight to isoclinal folds at various scales were related to a tectonic transport to the north. Brittle faulting occurred before and after folding as confirmed by tilt tests (the rotation of structural data by the average bedding). Foliation is ubiquitous in the incompetent units, including the Kendlbach Formation at the GSSP. A reverse fault (inferred to be formed as a normal fault before folding) crosscuts the GSSP sections, results in the partial tectonic omission of the Schattwald Beds, and thus makes it impossible to measure a complete and continuous stratigraphic section across the whole Kendlbach Formation. Based on these observations, the Kuhjoch sections do not fulfil the specific requirement for a GSSP regarding the absence of tectonic disturbances near boundary level.