Stratigraphic calibration of Oligocene–Miocene organic-walled dinoflagellate cysts from offshore Wilkes Land, East Antarctica, and a zonation proposal

IF 4.1 3区 地球科学 Q1 PALEONTOLOGY
P. Bijl, A. Houben, A.M.J. Bruls, J. Pross, F. Sangiorgi
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引用次数: 39

Abstract

Abstract. There is growing interest in the scientific community in reconstructing the paleoceanography of the Southern Ocean during the Oligocene–Miocene because these time intervals experienced atmospheric CO2 concentrations with relevance to our future. However, it has remained notoriously difficult to put the sedimentary archives used in these efforts into a temporal framework. This is at least partially due to the fact that the bio-events recorded in organic-walled dinoflagellate cysts (dinocysts), which often represent the only microfossil group preserved, have not yet been calibrated to the international timescale. Here we present dinocyst ranges from Oligocene–Miocene sediments drilled offshore the Wilkes Land continental margin, East Antarctica (Integrated Ocean Drilling Program (IODP) Hole U1356A). In addition, we apply statistical means to test a priori assumptions about whether the recorded taxa were deposited in situ or were reworked from older strata. Moreover, we describe two new dinocyst species, Selenopemphix brinkhuisii sp. nov. and Lejeunecysta adeliensis sp. nov., which are identified as important markers for regional stratigraphic analysis. Finally, we calibrate all identified dinocyst events to the international timescale using independent age control from calcareous nanoplankton and magnetostratigraphy from IODP Hole U1356A, and we propose a provisional dinoflagellate cyst zonation scheme for the Oligocene–Miocene of the Southern Ocean.
南极洲东部威尔克斯岛近海渐新世-中新世有机壁甲藻囊肿的地层校准和分带建议
摘要科学界对重建渐新世-中新世南大洋的古海洋学越来越感兴趣,因为这些时间间隔经历了与我们的未来相关的大气二氧化碳浓度。然而,将这些工作中使用的沉积档案纳入一个时间框架仍然是出了名的困难。这至少部分是由于在有机壁甲藻囊肿(甲藻囊肿)中记录的生物事件尚未按照国际时间尺度进行校准,甲藻囊肿通常代表唯一保存的微体化石群。在这里,我们介绍了在南极洲东部威尔克斯陆地大陆边缘近海钻探的渐新世-中新世沉积物的恐龙囊(综合海洋钻探计划(IODP)U1356A孔)。此外,我们应用统计方法来检验关于记录的分类群是原位沉积还是从较老地层重新形成的先验假设。此外,我们还描述了两个新的甲藻物种,Selenopenphix brinkhuii sp.nov.和Lejeunecysta adeliensis sp.nov..,它们被确定为区域地层分析的重要标志。最后,我们使用来自钙质纳米浮游生物的独立年龄控制和来自IODP孔U1356A的磁地层学,将所有已确定的甲藻囊肿事件校准到国际时间尺度,并提出了南大洋渐新世-中新世的临时甲藻囊肿分带方案。
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来源期刊
Journal of Micropalaeontology
Journal of Micropalaeontology 生物-古生物学
CiteScore
4.30
自引率
5.00%
发文量
7
审稿时长
>12 weeks
期刊介绍: The Journal of Micropalaeontology (JM) is an established international journal covering all aspects of microfossils and their application to both applied studies and basic research. In particular we welcome submissions relating to microfossils and their application to palaeoceanography, palaeoclimatology, palaeobiology, evolution, taxonomy, environmental change and molecular phylogeny.
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