Depositional processes of plant fragment-concentrated sandstones in turbiditic sequences recorded by plant biomarkers (Miocene Kawabata Formation, Japan)

Depositional processes of plant fragment-concentrated sandstones in turbiditic sequences recorded by plant biomarkers (Miocene Kawabata Formation, Japan)
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植物生物标志物记录的浊积层序中植物碎片集中砂岩的沉积过程(日本中新世川端组)

DOI:
10.1016/j.coal.2020.103643
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发表时间:
2021
影响因子:
5.6
通讯作者:
Kawakami Gentaro
Kawakami Gentaro
中科院分区:
工程技术2区
文献类型:
--
作者:
Furota Satoshi;Sawada Ken;Kawakami Gentaro

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在沉积于前渊盆地的中新世川端组(日本北海道中部夕张)浊流层序中,偶尔会发现独特的植物碎片(PF)密集砂岩层。通过沉积学和有机地球化学分析,研究了盆地中富含PFs的砂岩层的运移和沉积过程。根据沉积构造,将PF富集砂岩层划分为上、下两个PF富集层。下层包含混乱分散的PF,上层的特征是PF纹层。下层中分散的PF可能是通过快速沉积过程沉积的,例如悬浮颗粒的冻结或快速沉降。大量的PF沉积证实了生物标志物数据,如甾烷分布和姥鲛烷/植烷比值。正构烷烃和二萜类化合物在PF富集的砂岩层中的组成与其它砂泥岩层中的不同。这些结果表明,陆源颗粒来源于特定的陆生高等植物,有效地搬运和沉积,导致形成的PF集中的砂岩床。在层序中观察到的独特的沉积结构可以归因于大洪水流量,并且大量的PFs可能直接从上游河流输送,然后通过密度流(如相对集中的超密度流)到达深海盆地。
Occasionally, distinctive plant fragment (PF)-concentrated sandstone beds are found in the turbiditic sequence of the Miocene Kawabata Formation (Yubari, central Hokkaido, Japan) deposited in a foredeep basin. Sedimentological and organic geochemical analyses were carried out on the PF-concentrated sandstone bed to investigate the transport and depositional processes of the abundant PFs in the basin. The PF-concentrated sandstone bed was subdivided into lower and upper PF-concentrated layers based on their sedimentary structures. The lower layer contains chaotically dispersed PFs, and the upper layer is characterized by PF laminae. The dispersed PFs in the lower layer were likely deposited by rapid depositional processes such as freezing or rapid fall-out of suspended particles. The huge amount of PF deposition was confirmed by biomarker data such as sterane distributions and pristane/phytane ratios. The compositions ofn-alkanes and diterpenoids in the PF-concentrated sandstone bed are distinct from those in the other sandstone and mudstone beds. These results imply that the terrigenous particles originated from specific terrestrial higher plants that were effectively transported and deposited, resulting in formation of the PF-concentrated sandstone bed. The distinctive sedimentary structures observed in the sequences could be attributed to a large flood discharge and the huge volume of PFs might have been transported directly from an upper reach of river and then reached the deep-sea basin by density flows, such as relatively concentrated hyperpycnal flows.
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发表时间: 2013
期刊: --
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