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首页> 外文期刊>Geodinamica Acta >Palaeomagnetic investigation of Cenozoic volcanic rocks bordering the North Anatolian Fault Zone, Re?adiye and Koyulhisar Districts, central-east Anatolia, Turkey
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Palaeomagnetic investigation of Cenozoic volcanic rocks bordering the North Anatolian Fault Zone, Re?adiye and Koyulhisar Districts, central-east Anatolia, Turkey

机译：与土耳其安那托利亚中部东部的Reanadiye和Koyulhisar区北安那托利亚断层带接壤的新生代火山岩的古地磁研究

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摘要

A palaeomagnetic study is reported from the lavas of Eocene, Miocene and Pliocene age cropping out immediately to the north of the North Anatolian Fault Zone (NAFZ) in the Re?adiye-Mesudiye region of central-eastern Anatolia. Rock magnetic investigations identify a high percentage of multi-domained magnetite as the dominant ferromagnet in these rocks and this probably accounts for a relatively poor response to alternating field and thermal demagnetisation. Thirty of 37 units yielded acceptable groupings of characteristic magnetisation directions. An earlier study indicated small anticlockwise crustal block rotation in this region since Upper Cretaceous times (D/I = 347/50°), and our study indicates that this was overtaken by clockwise rotation in Eocene times (D/I = 40/47°), although sample size control from the Palaeogene is poor. Results from later Miocene (D/I = 2/62°) and Pliocene (D/I = 0/53°) volcanic rocks indicate that no significant tectonic rotation has occurred in the north of the NAFZ in Neogene times. This contrasts with rotations in the weaker crust comprising the Anatolian collage south of the NAFZ, where differential and sometimes large anticlockwise rotations occurred during the latter part of the Neogene.
机译：据报道，从始新世，中新世和上新世年龄的熔岩直接生长到安纳托利亚中部中部的Readidiye-Mesudiye地区北安纳托利亚断层带（NAFZ）以北的古地磁研究。岩石磁性研究发现，在这些岩石中，高比例的多畴磁铁矿是主要的铁磁体，这可能解释了对交变磁场和热退磁的相对较差的响应。 37个单位中有30个产生了可接受的特征磁化方向分组。较早的一项研究表明，自上白垩纪（D / I = 347/50°）以来，该区域逆时针地壳旋转较小，而我们的研究表明，始新世时期（D / I = 40/47°）已被顺时针旋转所取代），尽管来自古生代的样本量控制很差。后来的中新世（D / I = 2/62°）和上新世（D / I = 0/53°）​​火山岩的结果表明，在新近纪时期，NAFZ北部没有发生明显的构造旋转。这与包括NAFZ以南的安纳托利亚拼贴的较弱地壳的旋转形成对比，后者在新近纪后期发生了微分的旋转，有时甚至出现了较大的逆时针旋转。

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