The role of the proto-Alpine Cenerian Orogen in the Avalonian- Cadomian belt

IF 1.7 4区地球科学 Q2 Earth and Planetary Sciences

Austrian Journal of Earth Sciences Pub Date : 2023-01-01 DOI:10.17738/ajes.2023.0005

F. Finger, G. Riegler

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Abstract

Abstract The proto-Alpine Cenerian orogen (Ediacaran-Ordovician) and the Cadomian orogen (Ediacaran-Cambrian), remnants of which are exposed in the central European Variscides, should be defined as two distinct and spatially separated coastal orogens within the Avalonian-Cadomian belt. The Cadomian orogen originally lay in front of the Sahara metacraton. It underwent a change from an active to a passive margin setting during the Cambrian. The Cenerian orogen, represented by intra-Alpine rocks, was located farther east near the Arabian Nubian Shield, from where it inherited a characteristic Tonian/Stenian detrital zircon signal. Subduction persisted in the Cenerian Orogen until the Ordovician. The Cadomian orogen was akin to Andean type whereas the Cenerian orogen was more akin to Alaskan type. This paper explores why the two orogens have such different characteristics and tectonic evolutions despite their probable proximity in the Avalonian-Cadomian belt. One explanation could be that they were at nearly right-angles to each other due to a strong concave bending of the northern Gondwana margin ahead of the Arabian-Nubian Shield.

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原始阿尔卑斯-Cenerian造山带在阿瓦隆-卡多米亚带中的作用

摘要原始阿尔卑斯-Cenerian造山带（埃迪卡拉-奥陶纪）和卡多米亚造山带（埃迪卡拉纪-寒武纪），其残余暴露于中欧变西期，应被定义为阿瓦隆-卡多米亚带内两个不同且空间分离的海岸造山带。Cadomian造山带最初位于撒哈拉元卡顿的前方。在寒武纪，它经历了从主动边缘环境到被动边缘环境的转变。以阿尔卑斯山脉内部岩石为代表的Cenerian造山带位于更远的东部，靠近阿拉伯-努比亚地盾，从那里继承了特征性的托尼安/斯坦尼亚碎屑锆石信号。俯冲作用一直持续到奥陶纪。Cadomian造山带类似于安第斯类型，而Cenerian造山带更类似于阿拉斯加类型。本文探讨了为什么这两个造山带尽管可能位于阿瓦隆-卡多米安带，但具有如此不同的特征和构造演化。一种解释可能是，由于阿拉伯-努比亚地盾之前冈瓦纳大陆北部边缘的强烈凹入弯曲，它们几乎成直角。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Austrian Journal of Earth Sciences Earth and Planetary Sciences-Paleontology

CiteScore

3.10

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： AUSTRIAN JOURNAL OF EARTH SCIENCES is the official journal of the Austrian Geological, Mineralogical and Palaeontological Societies, hosted by a country that is famous for its spectacular mountains that are the birthplace for many geological and mineralogical concepts in modern Earth science. AUSTRIAN JOURNAL OF EARTH SCIENCE focuses on all aspects relevant to the geosciences of the Alps, Bohemian Massif and surrounding areas. Contributions on other regions are welcome if they embed their findings into a conceptual framework that relates the contribution to Alpine-type orogens and Alpine regions in general, and are thus relevant to an international audience. Contributions are subject to peer review and editorial control according to SCI guidelines to ensure that the required standard of scientific excellence is maintained.