白令海Navarinsky海底峡谷地震剖面解译

肖文涛; 郑玉龙; 张涛; 高金耀

doi:10.3969/j.issn.0253-4193.2014.10.007

白令海Navarinsky海底峡谷地震剖面解译

doi: 10.3969/j.issn.0253-4193.2014.10.007

国家海洋局第二海洋研究所, 浙江杭州 310012;国家海洋局海底科学重点实验室, 浙江杭州 310012

基金项目: 南北极环境综合考察与评估专项（CHINARE 2012-03-03）；中国极地科学战略研究基金（20100210）；海洋公益性行业专项经费项目（200905024-3）。

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出版历程
- 收稿日期: 2013-12-25
- 修回日期: 2014-07-25

Interpretation to the seismic profile of Navarinsky Canyon, Bering Sea

Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China

摘要

摘要: 第五次北极科学考察在北极区的白令海首次进行了高分辨率单道地震作业。Navarinsky峡谷头部测线BL11-12剖面中部识别出不对称沙波，陡的一面朝向陆架，波高约为9 m、波长约为882 m。结合站位U1345的沉积速率及站位U1344表层纵波速率推测沙波沉积可以追溯到中更新世（距今约0.258 Ma），同时近陆架的洼地逐渐填平。将地层分为3个沉积层，分析沉积物变化情况，结合0.25 Ma以来白令海海平面变化历史，推测最大海退事件对应的界面。结合沙波的地理位置及海平面变化情况，认为内波对沙波的形成起主要作用。
- Navarinsky海底峡谷 /
- 地震剖面 /
- 沙波
Abstract: High resolution single channel seismic operation was carried out in the Bering Sea during the 5th Chinese National Expedition. Asymmetric sand waves were identified on line BL11-12 seismic profile in the head of Navarinsky Canyon. The steep faces of asymmetric sand waves were on-shelf direction, the averaged wave height was 9 m and length was 882 m. There was a sedimentary depression at the end of line BL11-12 seismic profile. Combined the sedimentation rate of site U1345 and Vp of superficial sediment at site U1344, Infered that sand waves began deposit and sedimentary depression was filled since the Middle Pleistocene(about 0.258 Ma). Stratum was divided into three sediments. Analyzing changes of grain size on the profile, we can speculate the surface relating to the maximum regression combined with the change of the bering sea level. Taking every aspect into consideration, draw conclusion that sand waves formed during the low sea level in Middle Pleistocene, and internal wave played a significant role.
- Navarinsky Canyon /
- seismic profile /
- sand waves

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参考文献(22)

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