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首页> 外文期刊>地質調查研究報告 >北海道十勝沖前弧海盆東縁を流下する釧路海底谷上流域の 「しhかい6500」による潜航調査
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北海道十勝沖前弧海盆東縁を流下する釧路海底谷上流域の 「しhかい6500」による潜航調査

机译：“Shiki 6500”在Kushiro Marine Base地区“Shiki 6500”调查，沿着北海道Tokachi Oki Ark地区债券

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摘要

Dive survey by the submersible "Shinkai 6500" was conducted at a middle part of upper reaches (thalweg: water depth of 1814 m) of the Kushiro Submarine Canyon, off Tokachi, Hokkaido. The canyon indents the outer shelf along a generally straight, deeply entrenched course of 233 km in length upon the forearc basin and slope of the Kuril Trench in the Northwest Pacific. The canyon side-wall at the dive point is stepped as three outcropped escarpment and two terrace. The first escarpment is at the water depth of 1795-1770 m and is composed of alternating beds of very fine sandstone and siltstone. The second and the last escarpments are at the water depth of 1580-1550 m and 1415-1370 m, respectively. The last escarpment represents minor step-shaped outcrop. These are composed of massive siltstone. Most rock samples are semiconsolidated and composed of diatom frustules and fine-grained terrigenous elastics. The diatom and radiolarian ages suggest that the strata in the first, the second and the last outcrops were deposited in the early Late Pliocene, the late Late Pliocene, the Early Pleistocene periods, respectively.
机译：潜水潜水“Shinkai 6500”的潜水调查是在上游（Thalweg：1814米的水深）的kushiro潜艇峡谷的中间部分进行，Off Tokachi，Hokkaido。峡谷沿着一般直的，深深地根深蒂固的地架，在西北太平洋西北地区的前臂盆地和Kuril沟槽的坡度上长时间地施加233公里。潜水点的峡谷侧壁被踩到三个外悬垂性和两个露台。第一个悬崖处于水深1795-1770米，由非常细小的砂岩和硅铁晶的交替床组成。第二个和最后一个悬崖分别处于580-1550 m和1415-1370米的水深。最后一个悬崖代表着次要的阶梯状露头。这些由大量硅铁晶组成。大多数岩石样品都是半透明的，并由硅藻蛋白酶和细粒粒的植物弹性组成。硅藻和放射性症年龄表明，第一，第二和最后一个露头的地层分别沉积在早期的全茂，后期晚期全新世，早期百强期。

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