北吕宋海槽深海滑坡沉积及其分布特征
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摘要
通过浅地层剖面和多波束地形资料的精细解释,在北吕宋海槽中部发现了一个规模约500 km2,平均厚20多米的海底滑坡沉积。通过对该滑坡体的物源及其沉积环境分析,将整个滑坡体沉积分为末端区和前缘区两个部分。从滑坡体与周围地层的叠置关系及火山弧喷发的历史来看,初步认为该海底滑坡是地震造成的。该滑坡体的发现对深化深水滑坡体的认识具有重要作用。
High-resolution bathymetry and subbottom profile data have been acquired in the northern Luzon Trough,a landslide extended on an area of 500 km2,more than 20 m thick has been found in the middle trough.According to the analysis of landslide source and its sedimentary environment,the landslide is divided into two parts: an end area and a front area.From the relationship between the landslide area and the surrounding stratum and the history of the volcano eruption,it is suggested that the submarine landslide is triggered by the earthquake.Most submarine landslides occur in the depth range of 2 000 m,while the average depth of the study area is more than 3 000 m,thus the discovery of the submarine landslide is significant in deepening the research of the deepwater landslide.
High-resolution bathymetry and subbottom profile data have been acquired in the northern Luzon Trough,a landslide extended on an area of 500 km2,more than 20 m thick has been found in the middle trough.According to the analysis of landslide source and its sedimentary environment,the landslide is divided into two parts: an end area and a front area.From the relationship between the landslide area and the surrounding stratum and the history of the volcano eruption,it is suggested that the submarine landslide is triggered by the earthquake.Most submarine landslides occur in the depth range of 2 000 m,while the average depth of the study area is more than 3 000 m,thus the discovery of the submarine landslide is significant in deepening the research of the deepwater landslide.
引文
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[15]CARUSO MJ,GAWARKIEWICZ G G,BEARDSLEY R C.Interannual variability of the Kuroshio intrusion in the South China Sea[J].J Oceanogr,2006,62:559—575.
[2]RAO Y H,SUBRAHMANYAMC,RASTOGI A,et al.Slope failures alongthe western continental margin of India:a consequence of gas-hydrate dissociation,rapid sedi mentation rate,and seismic activity[J].Geo-Mar Lett,2002,22:162—164.
[3]LASTRAS G,CANALS M,HUGHES-CLARKE J E,et al.Seafloor i magery fromthe BIG’95 debris flow,western Mediterranean[J].Geology,2002,30:871—874.
[4]HAFLIDASON H,SEJRUP HP,NYGARD A,et al.The Storegga slide:architecture,geometry and slide development[J].Marine Geol-ogy,2004,213:201—234.
[5]CHAYTORJ D,BRI NK US,SOLOW A R,et al.Size distribution of submarine landslides along the U.S.Atlantic margin[J].MarineGeology,2009,264:16—25.
[6]冯志强.南海北部地质灾害及海底工程地质条件评价[M].南京:河海大学出版社,1996.
[7]刘保华,李西双,赵月霞,等.冲绳海槽西部陆坡碎屑沉积物的搬运方式:滑坡和重力流[J].海洋与湖沼,2005,36(1):2—5.
[8]李家彪,金翔龙,阮爱国,等.马尼拉海沟增生楔中段的挤入构造[J].科学通报,2004,49(10):1006—1007.
[9]WATTS AB,BODI NEJ H,BOWI N C O.Ageophysical atlas East and Southeast Asian seas:free-air gravityfield[Q]//Geol Soc Am.Ge-ol Society America Map and Chart Series Mc-25.1978.
[10]LEWIS S D,HAYES D E.The tectonics of northward propagating subduction along East Luzon,Philippine Island[C]//HAYES D E.The Tectonic and Geologic Evolution of Southeast Asian Seas and Islands:Part 2.Geophys Monog,Ser 27.Washington D C:AGU,1983:57—78.
[11]丁巍伟,杨树锋,陈汉林,等.台湾岛以南海域新近纪的弧-陆碰撞造山作用[J].地质科学,2006,41(2):198—199.
[12]吴水根,周建平,顾春华,等.海洋浅地层剖面仪及其应用[J].海洋学研究,2007,25(2):93—95.
[13]YENJ Y,LUNDBERG N.Sedi ment compositionsin offshore southern Tai wan andtheir relations to the source rocksin modern arc-con-tinent collision zone[J].Marine Geology,2006,225:260—262.
[14]SUPPE J.Kinematics of arc-continent collision,flipping of subduction,and back-arc spreading near Tai wan[J].Mem Geol Soc China,1984.6:21—36.
[15]CARUSO MJ,GAWARKIEWICZ G G,BEARDSLEY R C.Interannual variability of the Kuroshio intrusion in the South China Sea[J].J Oceanogr,2006,62:559—575.
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