台湾-吕宋岛双火山弧的构造意义
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摘要
扼要评介了国内外关于台湾-吕宋岛双火山弧在南海沿马尼拉海沟俯冲的动力学过程和俯冲板块深部形态等方面研究的成果;认为目前的动力学模式还不够完善,没有能够对台湾-吕宋岛双火山弧中存在的第四纪火山间断做出合理的解释,为此引入“板片窗”概念,对已经提出的动力学模式进行了修改;并统计1964~2006年发生于菲律宾地区的地震震中位置,认为存在于菲律宾群岛17°~19°N之间的深源地震稀疏带和存在于14°~15°N之间的喇叭状地震稀疏带是地震作用对于南海板片窗构造存在的反映;结合研究区域已有应力场研究资料,认为俯冲的南海亚板块中板片窗两侧俯冲倾角的差异,应该是造成俯冲带内应力分布出现分带现象的原因之一。
In this paper some brief comments were made on the research achievements of geodynamic process of the South China Sea subducted through the Manila Trench and the geometry of the subducted slab based on research results on the double island arc between Taiwan and Luzon. It is regarded by the authors that the proposed geodynamic modes are not complete, as the modes fail to make a satisfactory explanation to the gap of Quaternary volcanoes existing between Mt. Cagua and Baguio. Modification has been made on the latest proposed geodynamic mode by employing the concept of slab window. An earthquake catalog covering the period from 1964 to 2006 has been collected, and we believe that the low frequency of deep earthquake events in the area between latitude 17°N and 19°N as well as in the adjacent area between the 14°-15°N latitude of the Philippine Archipelago in the shape of horn are reflection of the existing slab-window beneath the Philippine Archipelago. Analytical results of the stress state in the slab of South China Sea plate suggest that the differences in dips of the two parts of the subducting South China Sea plate beside the deduced slab window can help to decipher the variety of the stress state in intraslab stress field of the subducting South China Sea plate.
In this paper some brief comments were made on the research achievements of geodynamic process of the South China Sea subducted through the Manila Trench and the geometry of the subducted slab based on research results on the double island arc between Taiwan and Luzon. It is regarded by the authors that the proposed geodynamic modes are not complete, as the modes fail to make a satisfactory explanation to the gap of Quaternary volcanoes existing between Mt. Cagua and Baguio. Modification has been made on the latest proposed geodynamic mode by employing the concept of slab window. An earthquake catalog covering the period from 1964 to 2006 has been collected, and we believe that the low frequency of deep earthquake events in the area between latitude 17°N and 19°N as well as in the adjacent area between the 14°-15°N latitude of the Philippine Archipelago in the shape of horn are reflection of the existing slab-window beneath the Philippine Archipelago. Analytical results of the stress state in the slab of South China Sea plate suggest that the differences in dips of the two parts of the subducting South China Sea plate beside the deduced slab window can help to decipher the variety of the stress state in intraslab stress field of the subducting South China Sea plate.
引文
丁巍伟,程晓敢,陈汉林,吴能友.2005.台湾增生楔的构造单元划分及其变形特征.热带海洋学报,24(5):54-59.
李家彪,金翔龙,阮爱国,吴世敏,吴自银,刘建华.2004.马尼拉海沟中断增生楔中的挤入构造.科学通报,49(10):1000-1008.
李三忠,郭晓玉,侯方辉,吕海青,金宠,刘保华.2004.活动大陆边缘的板片窗构造.海洋地质动态,20(11):6-18.
徐纪人,赵志新,河野芳辉,木下肇.2003.日本南海海槽地震区域应力场及其板块构造动力学特征.地球物理学报,46(4):488-494.
杨恬,吴世敏,刘海龄,周蒂.2005.南海西北部重磁场及深部构造特征.大地构造与成矿学,29(3):364-370.
朱俊江,丘学林,詹文欢,徐辉龙,孙龙涛.2005.南海东部海沟的震源机制解及其构造意义.地震学报,27(3):260-268.
Bautista B C,Bautista MP,Oike K,Wu F Tand PunongbayanR S.2001.A new insight on the geometry of subductingslabs in northern Luzon,Philippines.Tectonophysics,339:279-310.
Breitsprecher K,Thorkelson D J,Groome W G and Dostal J.2003.Geochemical confirmation of the Kula-Farallon slabwindow beneath the Pacific Northwest in Eocene time.Ge-ology,352-354.
Cadet J P,Kobayashi K,Aubouin J,Jacques B,Christine D,Jacques D,Roland V H,Laurent J,Toshihiko K,JunzoK,Kinichiro K,Serge L,Yasuo N,Guy P,Kiyoshi S,Shin T,Hidekazu T and Toshitsugu Y.1987.The JapanTrench and its juncture with the Kuril Trench:Cruise re-sults of the Kaiko project,Leg3.Earth Planet Sci Lett,83:267-284.
Dickinson W R and Snyder W S.1979.Geometry of subductedslabs related to San Andreas transform.Journal ofGeology,87:609-927.
Hamburger M W,Cardwell R K and Bryan I L.1983.Seis-motectonics of the Northern Philippine island arc.In:Hayes D E(ed).Tectonic and geologic evolution of theSoutheast Asian seas and islands.AGU Geophys MonogrSer,27:1-21.
Hole M J,Rogers G,Saunders A D and Storey M.1991.Rela-tion between alkalic volcanism and slab-window formation.Geology,19:657-660.
Kanamori H.1977.Seismic and aseismic slip along subductionzones and their tectonic implications.Maurice Ewing Ser,1:162-174.
Karing D E.1973.Plate convergence between the RyukyuIslands.Mar Geol,114:153-168.
Lewis S D and Hayes D E.1989.Plate convergence and de-formation,North Ridge,Philippines.Tectonophysics,168:221-237.
Schnurle P,Liu C S,Liu C S,Lallemand S E and Reed D L.1998.Structural insight into the south Ryukyu margin:Effects of the subducting Gagua Ridge.Tectonophysics,288:237-250.
Seno Tand Kurita K.1978.Focal mechanisms and tectonics inTaiwan-Philippine Region.J Phys Earth,26(supple-ment):249-263.
Taylor B and Hayes D E.1983.Origin and history of the SouthChina Sea Basin.In:Hayes D E(ed).Tectonic and geo-logical evolution of Southeast Asian seas and islands,Part2.Geophys Monogr Ser27.Washington,D C:AGU,23-56.
Thorkelson D J.1996.Subduction of diverging plates and theprinciples of slab window formation.Tectonophysics,255:47-63.
Yang TF,Lee T,Chen C H,Cheng S N,Knittel U,Punong-bayan R S and Rasdas AR.1996.Adouble island arc be-tween Taiwan and Luzon:consequence of ridge subduction.Tectonophysics,258:85-101.
李家彪,金翔龙,阮爱国,吴世敏,吴自银,刘建华.2004.马尼拉海沟中断增生楔中的挤入构造.科学通报,49(10):1000-1008.
李三忠,郭晓玉,侯方辉,吕海青,金宠,刘保华.2004.活动大陆边缘的板片窗构造.海洋地质动态,20(11):6-18.
徐纪人,赵志新,河野芳辉,木下肇.2003.日本南海海槽地震区域应力场及其板块构造动力学特征.地球物理学报,46(4):488-494.
杨恬,吴世敏,刘海龄,周蒂.2005.南海西北部重磁场及深部构造特征.大地构造与成矿学,29(3):364-370.
朱俊江,丘学林,詹文欢,徐辉龙,孙龙涛.2005.南海东部海沟的震源机制解及其构造意义.地震学报,27(3):260-268.
Bautista B C,Bautista MP,Oike K,Wu F Tand PunongbayanR S.2001.A new insight on the geometry of subductingslabs in northern Luzon,Philippines.Tectonophysics,339:279-310.
Breitsprecher K,Thorkelson D J,Groome W G and Dostal J.2003.Geochemical confirmation of the Kula-Farallon slabwindow beneath the Pacific Northwest in Eocene time.Ge-ology,352-354.
Cadet J P,Kobayashi K,Aubouin J,Jacques B,Christine D,Jacques D,Roland V H,Laurent J,Toshihiko K,JunzoK,Kinichiro K,Serge L,Yasuo N,Guy P,Kiyoshi S,Shin T,Hidekazu T and Toshitsugu Y.1987.The JapanTrench and its juncture with the Kuril Trench:Cruise re-sults of the Kaiko project,Leg3.Earth Planet Sci Lett,83:267-284.
Dickinson W R and Snyder W S.1979.Geometry of subductedslabs related to San Andreas transform.Journal ofGeology,87:609-927.
Hamburger M W,Cardwell R K and Bryan I L.1983.Seis-motectonics of the Northern Philippine island arc.In:Hayes D E(ed).Tectonic and geologic evolution of theSoutheast Asian seas and islands.AGU Geophys MonogrSer,27:1-21.
Hole M J,Rogers G,Saunders A D and Storey M.1991.Rela-tion between alkalic volcanism and slab-window formation.Geology,19:657-660.
Kanamori H.1977.Seismic and aseismic slip along subductionzones and their tectonic implications.Maurice Ewing Ser,1:162-174.
Karing D E.1973.Plate convergence between the RyukyuIslands.Mar Geol,114:153-168.
Lewis S D and Hayes D E.1989.Plate convergence and de-formation,North Ridge,Philippines.Tectonophysics,168:221-237.
Schnurle P,Liu C S,Liu C S,Lallemand S E and Reed D L.1998.Structural insight into the south Ryukyu margin:Effects of the subducting Gagua Ridge.Tectonophysics,288:237-250.
Seno Tand Kurita K.1978.Focal mechanisms and tectonics inTaiwan-Philippine Region.J Phys Earth,26(supple-ment):249-263.
Taylor B and Hayes D E.1983.Origin and history of the SouthChina Sea Basin.In:Hayes D E(ed).Tectonic and geo-logical evolution of Southeast Asian seas and islands,Part2.Geophys Monogr Ser27.Washington,D C:AGU,23-56.
Thorkelson D J.1996.Subduction of diverging plates and theprinciples of slab window formation.Tectonophysics,255:47-63.
Yang TF,Lee T,Chen C H,Cheng S N,Knittel U,Punong-bayan R S and Rasdas AR.1996.Adouble island arc be-tween Taiwan and Luzon:consequence of ridge subduction.Tectonophysics,258:85-101.
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