Integrated stratigraphy of a continental Pliensbachian–Toarcian Boundary (Lower Jurassic) section at Taskomirsay, Leontiev Graben, southwest Kazakhstan
Integrated stratigraphy of a continental Pliensbachian–Toarcian Boundary (Lower Jurassic) section at Taskomirsay, Leontiev Graben, southwest Kazakhstan
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DOI：
10.1144/sp427.15
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发表时间：
2016-11
期刊：
影响因子：
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通讯作者：
J. Schnyder;D. Pons;J. Yans;R. Tramoy;Saya Abdulanova
中科院分区：
文献类型：
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作者：
J. Schnyder;D. Pons;J. Yans;R. Tramoy;Saya Abdulanova
摘要在早侏罗世，与大的碳循环扰动有关的主要古气候变化发生在普连斯巴克奇-托阿尔西界线。虽然关于这段时间间隔的详细海洋古气候记录及其对海洋生物群的影响已经被很好地记录下来，但对大陆领域的了解要少得多。目前的研究记录了新的孢粉学和高分辨率碳同位素数据，这些数据来自中亚哈萨克斯坦塔斯克米尔塞大陆下侏罗统段的大量有机质。这两个数据集都允许识别普连斯巴赫和托尔西亚之间的过渡带。此外，孢子和花粉的分布表明，从普连斯巴契到托尔西亚有变暖的趋势，很可能与植物群组合从西伯利亚向中欧古植物区系转移有关，正如早侏罗世中亚其他地区所记录的那样。因此，塔斯科米尔赛剖面是古气候研究的主要兴趣所在，因为它是世界上为数不多的记录了普连斯巴克奇-托阿尔西亚古气候变化的准确年代的大陆剖面之一。补充材料：哈萨克斯坦卡拉陶格拉本Taskomirsay部分的δ13Corg数据表，可在以下网站获得
Abstract During the Early Jurassic, major palaeoclimatic changes, associated with large carbon-cycle perturbations, occurred at the Pliensbachian–Toarcian boundary. Although the detailed marine palaeoclimatic record of this time interval and its impact on the marine biota is well recorded, much less is known about the continental realm. The current study documents new palynological and high-resolution carbon isotope data measured on bulk organic matter from the continental Lower Jurassic section of Taskomirsay in Kazakhstan, Central Asia. Both datasets allow a transition zone between the Pliensbachian and Toarcian to be identified. In addition, the spore and pollen distribution suggests a warming trend from the Pliensbachian to the Toarcian, most probably associated with a shift in floristic associations from the Siberian to the Sino-European palaeofloristic provinces, as recorded elsewhere in Central Asia during the Early Jurassic. The Taskomirsay section is thus of primary interest for palaeoclimatic studies as it is one of the very few well-dated continental section worldwide that records the Pliensbachian–Toarcian palaeoclimatic changes. Supplementary material: Table of δ13Corg data, Taskomirsay section, Karatau Graben, Kazakhstan is available at https://doi.org/10.6084/m9.figshare.c.3495645