The Strona-Ceneri Zone is located south of the Insubric line, where Alpine overprint is mainly brittle and of low grade or even absent. Apart from the unmetamorphic Permo-Carboniferous sediments and intrusiva the Strona-Ceneri Zone is an Ordovician gneiss complex composed of paragneisses, migmatites, peraluminous orthogneisses and banded amphibolites associated with meta-gabbros and meta-ultramafics. Despite of the individual characters of the other Ordovician gneiss terranes north of the Insubric line, most prominently the Aar Massif, the Gotthard, Silvretta and Ötztal nappes, they show analogous lithological formations and pre-Mesozoic structures indicating similar genetic processes. A revision of geological maps and new field observations in these gneiss terranes indicate characteristic spatial relationships of banded amphibolite formations with migmatites and orthogneisses. The contrasting chemistries of the peraluminous rocks (para- and orthogneisses) and the basaltic amphibolites with a lack of intermediate lithologies in between can be explained by the setting of peraluminous arc magmatism within a subduction–accretion complex. In this model the amphibolites represent primary basalts which ponded at the base of the subduction–accretion complex and delivered the heat for the production of peraluminous melts. Volume estimations indicate a “zone of intermingling” composed of immiscible basalts and peraluminous melts with a total thickness of several kilometers. In this “zone of intermingling” the protoliths of the banded amphibolite formations were generated. Steep strike-slip faults, which are important structures for the syn-magmatic cratonization of subduction–accretion complexes, provide pathways for the emplacement of magmas, migmatites and intermingled materials. This results in the formation of steeply oriented sheets of orthogneisses, deformed migmatites and banded amphibolite formations, respectively. Finally, the paper lists many other peri-Gondwanan regions with an early Paleozoic peraluminous arc magmatism, indicating a similar setting on a global scale.

中文翻译：

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阿尔卑斯山带状两栖生物：与早期古生代过铝土岩浆作用有关的新解释

Strona-Ceneri区位于Insubric线以南，那里的高山叠印主要是脆性的，低品位甚至没有。除变质的石炭纪和石炭纪沉积物外，Strona-Ceneri区是奥陶纪的片麻岩复合物，由Paragneisses，Migmatite，高铝质的片状片麻岩和带状的两性辉石组成，并伴有变长辉闪石和超超音波岩。尽管在Insubric线以北的其他奥陶纪片麻岩地层具有个别特征，最突出的是Aar地块，Gotthard，Silvretta和Ötztal推覆，但它们显示出相似的岩性形成和中生代结构，表明相似的成因过程。在这些片麻岩地带中的地质图的修订和新的野外观察表明，带状的两栖辉石岩层与蒙脱石和正片麻岩的特征性空间关系。高铝弧岩岩浆作用在俯冲-增生复合物中的设置可以解释，这是由于高铝弧岩岩浆作用的设置解释了高铝质岩石（准和正长片麻岩）和玄武质角闪石之间缺乏中间岩性的对比化学。在该模型中，闪石代表初级玄武岩，它沉积在俯冲-吸积复合物的底部，并传递热量来生产高铝质熔体。体积估算显示出一个“混杂区域”，该区域由不混溶的玄武岩和铝质熔体组成，总厚度为几公里。在该“混杂区域”中，生成了带状两性辉石岩层的原石。陡峭的走滑断层是俯冲－增生复合物的岩浆克拉通化的重要结构，它为岩浆，辉锰矿和混杂材料的定位提供了途径。这导致分别形成陡峭片状片麻岩片，变形的辉马岩和带状的角闪石岩层。最后，该论文列出了许多早古生代铝辉弧岩浆作用的冈多瓦尼周边地区，这表明在全球范围内存在类似的环境。蒙脱石和混合材料。这导致分别形成陡峭片状片麻岩片，变形的辉马岩和带状的角闪石岩层。最后，本文列出了古生代早古铝土弧弧岩浆作用的许多其他冈多瓦南地区，表明在全球范围内存在类似的环境。蒙脱石和混合材料。这导致分别形成陡峭片状片麻岩片，变形的辉马岩和带状的角闪石岩层。最后，该论文列出了许多早古生代铝辉弧岩浆作用的冈多瓦尼周边地区，这表明在全球范围内存在类似的环境。