Middle Miocene to Pleistocene Diatom Biostratigraphy of the Northwest Pacific at Sites 1150 and 1151
Middle Miocene to Pleistocene Diatom Biostratigraphy of the Northwest Pacific at Sites 1150 and 1151
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DOI：
10.2973/odp.proc.sr.186.106.2003
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发表时间：
2003-10
期刊：
影响因子：
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通讯作者：
T. Maruyama;M. Shiono
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文献类型：
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作者：
T. Maruyama;M. Shiono
本文对日本东北部海域大洋钻探第186航次的两个站位的晚第三纪硅藻生物地层进行了研究。ODP第186航次的一个独特之处是在沿着日本海沟的深海阶地安装了两个永久性钻孔地球物理观测站。弧前的新近纪沉降历史记录于1150和1151号站点，第四纪至中新世中期（16 Ma）沉积物代表了一个几乎连续的地层序列，包括大量的火山灰记录，尤其是在过去的9百万年。在大多数样品中发现的硅藻丰度可变，在整个序列中保存良好。组合的特点是一致的年龄诊断种Denticulopsis和Neodenticula发现在高地表水生产力的地区，典型的中高纬度地区。新近纪北太平洋硅藻分带基本上很好地划分了中新世至第四纪层序，但中新世晚期至上新世早期Thalassiosira oestrupii亚带不适用。中新世和上新世晚期至更新世硅藻基准面已被证明在北太平洋具有很大的地层效用，在受岩心采集器样本间距限制的分辨率水平内，这些基准面似乎几乎是等距的。根据Thalassiosira trifulta组内的进化变化，对先前描述的被确定为中新世/上新世界线上有用的物种进行了分类和地层学研究。1 Maruyama，T.，和Shiono，M.，2003.西北太平洋1150和1151站中中新世至更新世硅藻生物地层学。在Suyehiro，K.，印第安纳州萨克斯市阿克顿，G. D.，和Oda，M.（编），Proc. ODP，Sci.结果，186，1-38 [在线]。可从万维网获取：2山形大学地球与环境科学系，1-4-12 Kojirakawa，Yamagata 990-8560，Japan。maruyama@sci.kj.yamagata-u.ac.jp日本札幌北区N10 W8北海道大学生物科学部，邮编060-0810。首次收到日期：2001年12月18日接受日期：2002年8月22日网上公布日期：2003年4月23日Ms 186 SR-106 T。丸山和M.盐野硅藻生物地层2海链藻属的生物地层学重要类型已用扫描电子显微照片加以说明。
Late Neogene biostratigraphy of diatoms has been investigated from two sites occupied during Ocean Drilling Program (ODP) Leg 186 off the coast of northeast Japan. A unique aspect of ODP Leg 186 was the installation of two permanent borehole geophysical observatories at the deep-sea terrace along the Japan Trench. The Neogene subsidence history of the forearc was documented from both Sites 1150 and 1151, and Quaternary to middle Miocene (16 Ma) sediments represent a nearly continuous stratigraphic sequence including numerous ash records, especially during the past 9 m.y. Diatoms are found in most samples in variable abundance and in a moderately well preserved state throughout the sequence. The assemblages are characterized consistently by age-diagnostic species of Denticulopsis and Neodenticula found in regions of high surface water productivity typical of middle to high latitudes. The Neogene North Pacific diatom zonation divides the Miocene to Quaternary sequences fundamentally well, except that the latest Miocene through early Pliocene Thalassiosira oestrupii Subzone is not applicable. Miocene and late Pliocene through Pleistocene diatom datum levels that have been proven to be of great stratigraphic utility in the North Pacific Ocean appear to be nearly isochronous within the level of resolution constrained by core catcher sample spacing. The taxonomy and stratigraphy of previously described species determined to be useful across the Miocene/Pliocene boundary have been investigated on the basis of the evolutionary changes within the Thalassiosira trifulta group. 1Maruyama, T., and Shiono, M., 2003. Middle Miocene to Pleistocene diatom biostratigraphy of the Northwest Pacific at Sites 1150 and 1151. In Suyehiro, K., Sacks, I.S., Acton, G.D., and Oda, M. (Eds.), Proc. ODP, Sci. Results, 186, 1–38 [Online]. Available from World Wide Web: . [Cited YYYY-MM-DD] 2Department of Earth and Environmental Sciences, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560, Japan. maruyama@sci.kj.yamagata-u.ac.jp 3Division of Biological Sciences, Hokkaido University, N10 W8 Kita-ku, Sapporo 060-0810, Japan. Initial receipt: 18 December 2001 Acceptance: 22 August 2002 Web publication: 23 April 2003 Ms 186SR-106 T. MARUYAMA AND M. SHIONO DIATOM BIOSTRATIGRAPHY 2 The biostratigraphically important forms belonging to the genus Thalassiosira have been illustrated with scanning electron micrographs.