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首页> 外文期刊>Journal of Asian earth sciences >Palaeobiogeographic implications of Late Bajocian-Late Callovian (Middle Jurassic) dinoflagellate cysts from the Central Alborz Mountains, northern Iran
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Palaeobiogeographic implications of Late Bajocian-Late Callovian (Middle Jurassic) dinoflagellate cysts from the Central Alborz Mountains, northern Iran

机译：伊朗北部中部阿尔博兹山晚巴乔期-晚卡洛夫期（中侏罗世）鞭毛虫囊肿的古生物地理意义

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摘要

The Dalichai Formation with an age of Late Bajocian-Late Callovian was sampled in Central Alborz Moun tains of northern Iran and studied for palynological, palaeobiogeographical and palynocorrelation pur poses. Palynological studies revealed diverse and well-preserved dinoflagellate cyst assemblages and lead to identification of three zones i.e., Cribroperidinium crispum (Late Bajocian), Dichadogonyaulax sell woodii (Bathonian to Early Callovian) and Ctenidodinium continuum (Early to Middle Callovian) Zones. Subzone a of the D. sellwoodii Zone (Early to Middle Bathonian) was also differentiated. This biozonation corresponds to those recognised in Northwest Europe. Furthermore, the ammonoid families recorded including Phylloceratidae, Oppeliidae, Reineckeiidae, Perisphinctidae, Haploceratidae, Parkinsoniidae and Sphaeroceratidae, which confirm the Late Bajocian to Late Callovian age, are quite similar to those of Northwest Europe and the northwestern Tethys. The close similarities of the dinoflagellate cyst assem blages and ammonite fauna of northern Iran with those of Northwest Europe and the northwestern Tethys during the Middle Jurassic indicate direct but episodic marine connection and faunal exchange between the two areas.
机译：在伊朗北部中部Alborz山地带取样的Dalichai组具有晚Bajocian-Late Callovian年龄，并进行了孢粉学，古生物地理学和古相关性研究。孢粉学研究表明，保留了各种各样且保存良好的鞭毛藻囊肿，并鉴定了三个区域，即Cribroperidinium crispum（Late Bajocian），Dichadogonyaulax出售woodii（从巴东语到早期Callovian）和Ctenidodinium连续体（从早到中Callovian）区域。 D. sellwoodii区的子分区a（早至中巴东期）也有所区分。该生物分区对应于在西北欧公认的那些分区。此外，记录下来的铵盐科包括圆柏科，Op科，雷奈科，Perisphinctidae，Haploceratidae，Parkinsoniidae和Sphaeroceratidae，它们证实了巴霍期晚期至卡洛维期晚期，与西北欧洲和特提斯西北部非常相似。中侏罗纪期间，伊朗北部的鞭毛虫囊肿碎片和炸药动物群与西北欧洲和特提斯西北部的动物群有密切相似之处，表明这两个地区之间存在直接但偶然的海洋联系和动物群交换。

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