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首页> 外文期刊>Gondwana research: international geoscience journal >First paleomagnetic data for the New Siberian Islands: Implications for Arctic paleogeography
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First paleomagnetic data for the New Siberian Islands: Implications for Arctic paleogeography

机译：新的西伯利亚群岛的第一个古磁性数据：对北极古地理的影响

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In this paper we present new paleomagnetic and paleontological data from the Ordovician and Silurian carbonate rocks of Kotelny Island (the Anjou Archipelago), and from the Ordovician turbidities of Bennett Island (the De Long Archipelago). It is assumed that both archipelagos belong to the NSI (New Siberian Islands) terrane a key tectonic element in the Arctic region. Ages of the studied rocks have been established by paleontological data and lithological correlations. Our new data on conodonts combined with those from previous studies of Ordovician and Silurian fauna indicate a biogeographic similarity between the shelves of the Siberian paleocontinent and the NSI in the Early Paleozoic. Three new paleomagnetic poles for the NSI (48.9 degrees N, 13.8 degrees E, A(95) = 18.1 degrees for 475 Ma; 45.5 degrees N, 31.9 degrees E, A(95) = 11.0 degrees for 465 Ma, and 33.7 degrees N, 55.7 degrees E, A(95) = 11.0 for 435 Ma) fall between the south-eastern part of Central Europe and the Zagros Mountains. The similarity of paleomagnetic directions from Kotelny and Bennet islands confirms that both the Anjou and De Long archipelagos belong to the same terrane. Calculated paleolatitudes indicate that in Ordovician-Silurian times this terrane has been located between 30 and 45, possibly in the northern hemisphere. Based on this observation, we suggest a linkage between the NSI and the Kolyma-Omolon superterrane. Comparison of apparent polar wander paths (APWPs) of the NSI, Siberia and other cratons/terranes suggests that the NSI drifted independently. We demonstrate that the structural line between Svyatoy Nos Peninsula and Great Lyakhovsky Island is the continuation of the Kolyma Loop suture on the Arctic shelf, and expect that the continuation of the South Anyui suture is to be found east of the NSI. (C) 2015 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
机译：在本文中，我们呈现来自奥陶涅迪岛（Anjou Archipelago）的奥陶涅师和硅灰岩岩石的新古磁性和古生物学数据，以及贝内特岛（De Long Archipelago）的奥陶艺术船线。假设两个群岛都属于NSI（新西伯利亚群岛）地区北极地区的关键构造元素。已经通过古生物数据和岩性相关建立了学习的岩石。我们关于康塞登的新数据与奥莫利亚和艾尔氏岛的先前研究的数据相结合，表明了西伯利亚古地区的架子与早期古生代的NSI之间的生物地理相似性。对于475 mA，NSI的三个新的旧古磁极（48.9度N，13.8°E，A（95）= 18.1度; 45.5度N，31.9 e，a（95）= 11.0度，465 mA，33.7度，55.7摄氏度，A（95）= 11.0，435 mA）落在中欧欧洲和ZAGROS山脉的东部。从科特尼和班洁净群岛的古磁道的相似性证实，Anjou和de longipelagos都属于同一台地区。计算的古色宝化表明，在奥莫瓦伊 - 艾瑞亚时代，这台地区的次数在30到45岁之间，可能在北半球。基于该观察，我们建议NSI与Kolyma-Omolon SuperTrane之间的联系。 NSI，西伯利亚和其他Cratons / Terranes的表观极性漫游路径（APWP）的比较表明，NSI独立漂流。我们证明Svyatoy Nos Peninsula和Great Lyakhovsky Island之间的结构线是北极架上的Kolyma Loop Suture的延续，并期望南部的南部缝合的延续将在NSI以东找到。 （c）2015年巩固巩膜研究协会。 elsevier b.v出版。保留所有权利。

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