Evaluation of sedimentary processes of plant particles by gravity flow using biomarkers in plant fragment-concentrated sediments of a turbiditic sequence in the Miocene Kawabata Formation distributed along the Higashiyama-gawa River, Yubari, Hokkaido, Japan
Evaluation of sedimentary processes of plant particles by gravity flow using biomarkers in plant fragment-concentrated sediments of a turbiditic sequence in the Miocene Kawabata Formation distributed along the Higashiyama-gawa River, Yubari, Hokkaido, Japan
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利用分布在日本北海道夕张市东山川的中新世川端组浊积层序植物碎片浓缩沉积物中的生物标志物通过重力流评估植物颗粒的沉积过程
DOI：
10.20612/rog.30.1_9
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Gentaro Kawakami
中科院分区：
文献类型：
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作者：
S. Furota;K. Sawada;Gentaro Kawakami
在日本北海道中部夕张东山川沿着分布的中新统川端组深海浊流沉积层序中发现了一组独特的植物碎屑密集砂岩。通过对沉积物中植物碎屑的显微观察和陆生高等植物生物标志物的分析，研究了重力流沉积过程中植物颗粒的沉积学和水动力学行为。生物标志物组合物，如姥鲛烷/植烷和常规甾烷的比例表明，在砂岩层的陆地有机质，特别是木质碎片的贡献很大。陆源高等植物萜类化合物（五环三萜、脱A三萜和二萜）的相对丰度在砂岩层的各个部分都很高，而长链正构烷烃的浓度仅在最上部显著较高。此外，叶角质层碎片主要存在于最上部。这些结果表明，植物叶片主要沉积在砂岩层的最上部。因此，可以认为沉积的植物碎片类型（组织）的变化是由重力流中各种水动力行为引起的。
Distinctive plant fragment-concentrated sandstones are found in a turbiditic sequence deposited under deep sea environment in the Miocene Kawabata Formation distributed along the Higashiyama-gawa River, Yubari, central Hokkaido, Japan. We observed microscopically the plant fragments and analyzed terrestrial higher plant biomarkers in the sediments to evaluate sedimentological and hydrodynamic behaviors of plant particles by gravity flow depositional processes. Biomarker compositions such as pristane / phytane and regular sterane ratios indicate a large contribution of terrestrial organic matter, especially woody fragments, in the sandstone layer. The relative abundances of terrestrial higher plant terpenoids (pentacyclic triterpenoids, des-A-triterpenoids and diterpenoids) are high in all parts of the sandstone layer, while long-chain n-alkane concentrations are remarkably higher only at the uppermost part. Also, leaf cuticle fragments are mainly found in the uppermost part. These results suggest that plant leaves are mainly deposited in the uppermost part of the sandstone layer. Thus, it is concluded that the variations in plant fragment types (tissues) deposited are thought to be resulted from various hydrodynamic behavior in gravity flow.
日本中部新泻平原全新世河口异重流的发生条件及其有机质沉积意义
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
Yoshida;M.;Yoshiuchi;Y.;Hoyanagi;K
通讯作者：
K