Palynostratigraphy and Foraminiferal Stratigraphy of the Early Miocene Qom Formation in the Northeastern Margin of the Tethyan Seaway

IF 0.7 4区地球科学 Q4 PALEONTOLOGY

Paleontological Journal Pub Date : 2023-11-30 DOI:10.1134/s0031030123070031

Afsaneh Dehbozorgi, Saeed Maleki

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Abstract

Lower Miocene strata are exposed in the northwest of Ashtian, in the Central Iran Zone. Biostratigraphy of the Qom Formation was investigated using dinoflagellate cyst and benthic foraminifera. The stratigraphic distribution of the dinocysts lead to the identification of two distinctive stratigraphically non-continuous palynozones viz., Caligodinium amiculum (late Aquitanian) and Cordosphaeridium cantharellus (early Burdigalian) zones. This biozonation is equivalent to that recognized in Northwest Europe. Moreover, the presence of such stratigraphically distinctive taxa as Borelis melo curdica, Meandropsina iranica, Elphidium sp. 14, and Miogypsina sp. enabled the identification of the two consecutive biozones: the Elphidium sp. 14—Miogypsina Assemblage Subzone and the Borelis melo group Meandropsina iranica Assemblage Zone. The late Aquitanian–Burdigalian age is collectively attributed, therefore, to the studied section. This age assignment is based on the dinocysts and foraminifer species compared with other stratigraphic sections. The close resemblance of the dinoflagellate cyst assemblages of the Qom Basin with Northwest Europe and the northwestern Tethys during the Oligocene-early Miocene indicates a marine connection and faunal exchange between the two regions.

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特提斯海道东北缘早中新世库姆组孢粉地层和有孔虫地层

摘要伊朗中部阿什田地区西北部出露下中新世地层。利用鞭毛藻囊和底栖有孔虫研究了库姆组的生物地层。根据孢囊的地层分布，鉴定出两个独特的地层不连续孢囊带，即Caligodinium amiculum(晚阿基塔尼亚期)和Cordosphaeridium cantharellus(早burdigian期)。这种生物区隔与欧洲西北部的生物区隔相同。此外，甜瓜Borelis melo curdica、Meandropsina iranica、Elphidium sp. 14和Miogypsina sp.等具有地层特征的分类群的存在，使得两个连续的生物带得以确定:Elphidium sp. 14 - Miogypsina组合亚带和甜瓜Borelis melo群Meandropsina iranica组合带。因此，阿基坦-布尔迪加时代的晚期被统称为被研究的部分。这个年龄的确定是基于与其他地层剖面比较的恐龙囊和有孔虫种类。库姆盆地在渐新世至中新世早期与欧洲西北部和特提斯西北部的鞭毛藻囊组合非常相似，表明这两个地区之间存在海洋联系和动物交换。

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来源期刊

Paleontological Journal 地学-古生物学

CiteScore

1.20

自引率

33.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Paleontological Journal (Paleontologicheskii zhurnal) is the principal Russian periodical in paleontology. The journal publishes original work on the anatomy, morphology, and taxonomy of fossil organisms, as well as their distribution, ecology, and origin. It also publishes studies on the evolution of organisms, ecosystems, and the biosphere and provides invaluable information on global biostratigraphy with an emphasis on Eastern Europe and Asia.