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首页> 外文期刊>Journal of Asian earth sciences >Stratigraphic review of Eocene to Oligocene successions along the eastern Japan Sea: Implication for early opening of the Japan Sea
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Stratigraphic review of Eocene to Oligocene successions along the eastern Japan Sea: Implication for early opening of the Japan Sea

机译：日本东海始新世至渐新世演替的地层学研究：对日本海提早开放的启示

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摘要

Stratigraphic review of the on-land successions exposed on the back-arc side of Japan and Sakhalin, combined with supplemental radiometric dating, reveals the existence of Late Eocene or Oligocene marine sediments along the eastern coast of the Japan Sea. This finding implies that the origin of the Japan Sea dates back to the Oligocene or earlier time, much older than ever supposed. The host Eocene to Oligocene subaerial to shallow-water successions distribute immediate west of the volcanic front of that time and contain volcanic rocks, the chemistry of which is characteristic of continental rift or volcanic arc. They are associated with parallel dike swarms or normal faults, and could be infillings of an incipient back-arc rift. Collective evidence suggests that the rift was rapidly subsided and spread during the following Early to Middle Miocene time. However, a back-arc-wide unconformity was produced during a short period from the latest Oligocene to the earliest Miocene and was succeeded by extensive bimodal volcanism with rapid migration of the volcanic front to the fore-arc side. These short-term events could have been induced by upwelling or inflow of hot asthenosphere beneath the arc-rift system, followed by rapid subsidence and spreading of the Japan Sea.
机译：对日本和萨哈林岛后弧侧陆上演替的地层学研究，加上补充的辐射测年，揭示了日本海东海岸晚始新世或渐新世的海洋沉积物的存在。这一发现暗示日本海的起源可以追溯到渐新世或更早的时间，比以前想象的要古老得多。始新世至渐新世，陆上至浅水演替分布在当时火山前沿以西，并包含火山岩，其化学性质是大陆裂谷或火山弧的特征。它们与平行的堤防群或正常的断层有关，并且可能是初期弧后裂谷的填充物。集体证据表明，在随后的中新世早期至中期，裂谷迅速平息并扩散。然而，从最新的渐新世到最早的中新世在短时期内就产生了弧后范围的不整合面，随后又由于广泛的双峰火山作用而使火山前沿迅速向前弧面迁移。这些短期事件可能是由于弧形裂谷系统之下的热流软流圈上升或流入，然后是日本海的快速沉降和扩散所引起的。

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