On the age of the sedimentary cover of the Kurile Basin, Sea of Okhotsk

被引：0
作者：
V. G. Prokudin
机构：
[1] Russian Academy of Sciences,Il’ichev Pacific Institute of Oceanology, Far East Branch
来源：
Russian Journal of Pacific Geology | 2015年 / 9卷
关键词：
seismic data; velocity model; sedimentary cover; Sea of Okhotsk;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A velocity model of the upper Earth’s crust of the Kurile Basin, Sea of Okhotsk, is constructed using experimental seismic data. Four layers are distinguished in the sedimentary cover with the maximum thickness of 3000 m. The lower layer, up to 1100 m thick with layer velocity of 3.2–3.5 km/s, is observed only in the abyssal part of the basin. This layer pinches out near the foot of the basin slopes, is never exposed on the sea floor, and is not available for dredging. The cross-section of sedimentary cover contains seismic boundaries—markers, which mark the regional sedimentation gaps in the Middle Eocene, Late Oligocene, and Late Miocene. It is shown that an extensive sedimentary basin existed within the Kurile Basin as early as the Late Mesozoic. The sediments were accumulated in an environment of synsedimentary subsidence on the continental margin, where a paleobasin with almost present-day boundaries was formed by the end of the Oligocene.
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页码：215 / 226
页数：11
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