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首页> 外文会议>International Symposium on the Jurassic Boundary Events and the Annual Symposium of the International Geoscience Program IGCP 506: Marine and Non-Marine Jurassic; 20051101-04; Nanjing(CN) >New data on isotopic composition of Jurassic-Early Cretaceous cephalopods
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New data on isotopic composition of Jurassic-Early Cretaceous cephalopods

机译：侏罗纪-早白垩世头足类动物同位素组成的新数据

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摘要

The aim of this paper is to reconstruct the Jurassic-Early Cretaceous climatic conditions using new isotopic data. Paleob-otanical data indicate that a cooling occurred gradually just after Late Triassic, and a temperature minimum was reached in the Pliensbachi-an. This was followed by a climatic optimum in the early Toarcian, cooling in the late Toarcian and a second climatic optimum in the Ox-fordian. Published isotopic thermometry data and our new results on isotopic composition of some Jurassic invertebrate shells from the Russian Platform, Poland, Germany and England generally confirm this pattern, and also indicate a third climatic optimum in the Middle Callovian. Middle-Late Mesozoic adult belemnites apparently lived during their spawning phase, in shallow waters similar to extant Nautilus . However, at least juvenile belemnoids, unlike ammonoids, engaged in significant short-term vertical migrations in the water column, reaching colder waters of the upper bathyal zone.
机译：本文的目的是利用新的同位素数据重建侏罗纪-早白垩世的气候条件。 Paleob-植物学数据表明，在三叠纪晚期之后才逐渐出现冷却，并且在Pliensbachi-an中达到了最低温度。其次是早Toarcian的气候最佳，Toarcian末期的冷却和牛津福德的第二个气候最佳。来自俄罗斯平台，波兰，德国和英国的已公布的同位素测温数据和我们对某些侏罗纪无脊椎动物壳的同位素组成的新结果总体上证实了这种模式，并且也表明了中卡洛夫期的第三次气候最佳。中晚期的中生代成年贝类动物显然在产卵期生活在浅水区，类似于现存的鹦鹉螺。但是，与氨类化合物不同，至少少年类贝类动物在水柱中会发生短期的短期垂直迁移，并到达上海区的较冷水域。

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