globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.03.027
论文题名:
Palaeoecological effects of back-arc spreading on Miocene benthic communities, SW Japan Arc
作者: Nara M.; Aikou K.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 453
起始页码: 80
结束页码: 92
语种: 英语
英文关键词: Active tectonics ; Backarc spreading ; Ichnofabrics ; Japan ; Less bioturbated sediment ; Palaeoecology
英文摘要: During the early to middle Miocene, rapid development of backarc basins, now known as the Sea of Japan, occurred in the NE margin of the Asian Continent. Then the entire SW Japan Arc (the arc) was rotated clockwise very rapidly. Such an event was associated with the opening of another backarc basin located to the south of the arc. Immediately after this opening, the very young, hot oceanic plate began to subduct underneath the arc. This subduction caused rapid uplifting and enhanced the denudation of the arc, in the post-early Miocene. The lower to middle Miocene Misaki Group is a 3,000 m-thick siliciclastic forearc basin fill, consisting of wave-dominated shallow-marine and overlying braid-plain deposits. Its defining features are the low ichnodiversity and paucity of ichnofabrics. For instance, up to 96% of the total thickness of the measured offshore deposits are non- or very slightly-bioturbated, despite the other “normal” offshore deposits are generally highly bioturbated. Although the less bioturbated sediments were previously considered as anoxic deposits, anoxic water was unlikely to develop within the highly open wave-dominated shallow-marine settings. The highly active tectonics associated with the spreading of the two backarc basins and the forced subduction most likely caused sediment mass-production in the hinterland, as evidenced by the sedimentological features of the coeval Kuma Group, and over-sedimentation (highly frequent and rapid sedimentation) that was taken place across the entire Misaki Basin. This over-sedimentation, supported by a series of evidence, such as the pervasive soft-sediment deformation across the group, estimated rate of net aggradation (more than 136 to 230 cm/kyr), etc., most likely induced the colonisation of depauperated fauna, and diluted their ichnofabrics, across the entire basin. The extremely active tectono-sedimentation played an important role in the development of the basin-wide anomalous benthic ecosystems and ichnofabrics during the early to middle Miocene. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68416
Appears in Collections:过去全球变化的重建

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作者单位: Department of Natural Sciences, Kochi UniversityKochi, Japan; Yamaguchi Branch, Token Geotec, Co., Ltd., 6-2-39 Ouchi-yada-kita, Yamaguchi, Japan

Recommended Citation:
Nara M.,Aikou K.. Palaeoecological effects of back-arc spreading on Miocene benthic communities, SW Japan Arc[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,453
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