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首页> 外文期刊>Journal of nannoplankton research: A publication of the International Nannoplankton Association >Quantitative analysis of Late Campanian calcareous nannofossils in the Gurpi section (SW Iran)
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Quantitative analysis of Late Campanian calcareous nannofossils in the Gurpi section (SW Iran)

机译：居尔皮断面（伊朗西南部）晚寒武纪钙质纳米化石的定量分析

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摘要

The Late Cretaceous was a period of long-term climatic cooling that occurred after the extreme warmth of the mid-Cretaceous greenhouse world (Jenkyns et al., 1994; Huber et al., 2002). A global cooling trend commenced during the late Campanian and continued into the Maastrichtian (Huber et al., 1995; Clarke & Jenkyns,1999). The highest provincialism in the calcareous nannofossil assemblages was recognized during this time interval (Burnett, 1998). This study focused on the paleoclimate and paleoceanography of the late Campanian by analyzing the calcareous nannofossil assemblages at the Gurpi section in the Zagros Basin. The studied interval ranges from UC15eTP to the first part of UC17. The calcareous nannofossils are well preserved, highly abundant, and diverse. The assemblages are dominated by Watznaueria barnesiae (22%), Prediscosphaera sp. (11%), Retecapsa sp. (10%), Cribrosphaerella ehrenbergii (10%), Micula swastica (9%), Micula decussata (8%), Arkhangelskiella cymbiformis (8%),Microrhabdulus decoratus (8%), and Placozygus fibuliformis (7%). The abundance of cold-water taxa (Ahmuellerella octoradiata,Gartnerago segmentatum, and Kamptnerius magnificus) is less than 0.5%. Other taxa that are considered as coolwater species, such as Tranolithus orionatus, Biscutum constans,Zeugrhabdotus spp., A. cymbiformis, M. decussata, Prediscosphaera cretacea, and Eiffellithus turriseiffelii, are present are abundant. Warm-water taxa, such as W. barnesiae, Ceratolithoides spp., Uniplanarius trifidus, and Aspidolithus spp., are also present. The number of warm-water species is higher than cool-water forms. Although cool-and warm-water species were observed together, an opposite trend was observed between them. The relative abundance of warm-water species decreased toward the top of the Campanian, while the relative abundance of cool-water species increased, which is indicative of climate cooling at this time interval.
机译：白垩纪晚期是白垩纪中期温室世界极端温暖之后发生的长期气候降温时期（Jenkyns等，1994; Huber等，2002）。全球的降温趋势始于Campanian晚期，并一直持续到Maastrichtian（Huber等，1995; Clarke＆Jenkyns，1999）。在这段时间里，人们认识到石灰质纳米化石组合中的最高省级主义（Burnett，1998）。这项研究通过分析Zagros盆地Gurpi剖面的钙质纳米化石组合，将重点放在了Campanian晚期的古气候和古海洋学上。研究的时间间隔从UC15eTP到UC17的第一部分。钙质纳米化石保存完好，高度丰富，种类繁多。该组合以Watznaueria barnesiae（22％），Prediscosphaera sp。占主导。 （11％），Retecapsa sp.。 （10％），克氏杆菌（10％），sw菜（9％），de菜（8％），猕猴桃（8％），小孔雀（8％）和腓肠杆菌（7％）。冷水类群（Ahmuellerella octoradiata，Gartnerago segmentatum和Kamptnerius magnificus）的丰度小于0.5％。存在着其他被认为是凉水物种的分类单元，例如Tra耳石,、 Biscutum constans，Zeugrhabdotus spp。，拟南芥，M. decussata，Prediscosphaera cretacea和Eiffellithus turriseiffelii。也存在温水分类群，例如W. barnesiae，Ceratolithoides spp。，Uniplanarius trifidus和Aspidolithus spp.。热水种类的数量高于冷水形式的种类。尽管同时观察到冷水和温水物种，但它们之间却观察到相反的趋势。靠近坎帕尼亚顶部的暖水物种的相对丰度下降，而冷水物种的相对丰度增加，这表明在此时间间隔气候变冷。

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