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首页> 美国卫生研究院文献>Elsevier Sponsored Documents >The Haselgebirge evaporitic mélange in central Northern Calcareous Alps (Austria): Part of the Permian to Lower Triassic rift of the Meliata ocean?
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The Haselgebirge evaporitic mélange in central Northern Calcareous Alps (Austria): Part of the Permian to Lower Triassic rift of the Meliata ocean?

机译：位于北部钙质阿尔卑斯山中部（奥地利）的Haselgebirge蒸发混杂岩：属于Meliata海洋的二叠纪至下三叠纪裂谷吗？

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For the reconstruction of Alpine tectonics of the Eastern Alps, the evaporitic Permian to Lower Triassic Haselgebirge Formation plays a key role in (1) the origin of Haselgebirge bearing nappes, (2) the inclusion of magmatic and metamorphic rocks revealing tectonic processes not preserved in other units, and (3) the debated mode of emplacement of the nappes, namely gravity-driven or tectonic. Within the Moosegg quarry of the central Northern Calcareous Alps gypsum/anhydrite bodies are tectonically mixed with lenses of sedimentary rocks and decimeter- to meter-sized tectonic clasts of plutonic and subvolcanic rocks and rare metamorphics. We examined various types of (1) widespread biotite–diorite, meta-syenite, (2) meta-dolerite and rare ultramafic rocks (serpentinite, pyroxenite) as well as (3) rare metamorphic banded meta-psammitic schists and meta-doleritic blueschists. The apparent 40Ar/39Ar biotite ages from three biotite–diorite, meta-dolerite and meta-doleritic blueschist samples with variable composition and fabrics range from 248 to 270 Ma (e.g., 251.2 ± 1.1 Ma) indicating a Permian age of cooling after magma crystallisation or metamorphism. The chemical composition of biotite–diorite and meta-syenite indicates an alkaline trend interpreted to represent a rift-related magmatic suite. These, as well as Permian to Jurassic sedimentary rocks, were incorporated during Cretaceous nappe emplacement forming the sulphatic Haselgebirge mélange. The scattered 40Ar/39Ar white mica ages of a meta-doleritic blueschist (of N-MORB origin) and banded meta-psammitic schist are ca. 349 and 378 Ma, respectively, proving the Variscan age of pressure-dominated metamorphism. These ages are similar to detrital white mica ages reported from the underlying Rossfeld Formations, indicating a close source–sink relationship. According to our new data, the Haselgebirge bearing nappe was transported over the Lower Cretaceous Rossfeld Formations, which include many clasts derived from the Haselgebirge Formation and its exotic blocks deposited in front of the incoming nappe comprising the Haselgebirge Formation.
机译：为了重建东阿尔卑斯山的高山构造，从二叠纪到下三叠纪哈塞尔盖比格组的蒸发二叠系在以下方面起着关键作用：（1）哈塞尔盖比格推覆的成因，（2）岩浆和变质岩的包裹揭示了未保留的构造过程其他单位，以及（3）讨论的尿布安置方式，即重力驱动或构造。在北部钙质阿尔卑斯山中部的穆斯格采石场内，石膏/硬石膏体与沉积岩晶状体，分度至米级的构造岩屑和浅火山岩和次火山岩以及稀有的变质岩混合在一起。我们研究了各种类型的（1）广泛的黑云母－闪闪岩，变质正长岩，（2）变质榴辉岩和稀有超镁铁质岩石（蛇纹石，辉石岩），以及（3）稀有的变质带状变质叠片岩和变质成岩的蓝变岩。 。三种黑云母，闪长岩，变质榴辉岩和变质变质蓝岩样品的明显 40 Ar / 39 Ar黑云母年龄，其组成和结构从248-270Ma不等（例如251.2±1.1 Ma），表示岩浆结晶或变质后的二叠纪冷却年龄。黑云母－闪长岩和偏亚硒酸盐的化学成分表明碱性趋势被解释为代表与裂谷有关的岩浆组合。这些以及二叠纪至侏罗纪的沉积岩，在白垩纪推覆作用期间形成了硫酸化的哈塞尔盖比奇混杂岩。大约（-N-MORB起源）的变质早熟蓝粉岩和带状的超叠片岩的散布的 40 Ar / 39 Ar白云母。 349和378 Ma分别证明了压力主导的变质作用的瓦里斯坎时代。这些年龄与潜在的罗斯菲尔德组所报道的碎屑白云母年龄相似，表明其源库关系密切。根据我们的新数据，含哈斯尔盖比格岩浆被输送到下白垩纪的罗斯菲尔德地层上，其中包括来自哈斯尔盖比尔格岩层的许多碎屑及其沉积在包括哈斯尔盖比尔格岩层的进入的纳普前的奇异岩块。

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