关于弧后扩张机制的新看法
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摘要
为了探讨弧后扩张的内在机制 ,计算得出了一些弧后扩张背景下板舌参数及边缘海资料的特征 ,综合古地磁、地热、重力、地震等信息 ,认为弧后扩张可能与板舌舌端地质行为有关 ,具体形成机制可能是 :可能已经发生正断的板舌舌端发生熔融分异 ,低密度部分上升膨胀 ,高密度部分下沉 ,在合适条件下形成物质对流环 ,导致弧后扩张。这种模式可以更好地解释弧后扩张的可能发生过程和演化旋回 ,还为解释多岛海的形成提供了一个可能的思路
In this paper, the authors study on back-arc spreading mechanism, and have some characteristics of some plate tongue variations and back-arc basins of background of back-arc spreading. By analysising some information of paleo-magnetism, terrestrial heat, gravity, seism etc. The authors argue that back-arc spreading may be caused by tongue end of plate tongue. Differentiation by liquation takes places in tongue end, which is low temperature conductivity and may be have some form faults. Lower dense part would rise up and dilate, while high dense part would sink. Thus a convection circulation will work. Under proper conditions, it will cause back-arcspreading. This mechanism gives us a model on procession andcycle of back-arc spreading.And italso gives us a proper idea on forming ofarchipelago.
In this paper, the authors study on back-arc spreading mechanism, and have some characteristics of some plate tongue variations and back-arc basins of background of back-arc spreading. By analysising some information of paleo-magnetism, terrestrial heat, gravity, seism etc. The authors argue that back-arc spreading may be caused by tongue end of plate tongue. Differentiation by liquation takes places in tongue end, which is low temperature conductivity and may be have some form faults. Lower dense part would rise up and dilate, while high dense part would sink. Thus a convection circulation will work. Under proper conditions, it will cause back-arcspreading. This mechanism gives us a model on procession andcycle of back-arc spreading.And italso gives us a proper idea on forming ofarchipelago.
引文
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[2] SLEEPN ,TOKSOZMN .Evolutionofmarginalbasins[J].Nature,1971,233:548550.
[3] MOLNARP ,ATWATERT .Interarcspreadingandcordillerantectonicsasalternatesrelatedtotheageofsubduct edoceaniclithosphere[J].EarthPlanetScience,1978,441:330340.
[4] DICKINSONWR .PlatetectonicevolutionofNorthPacificrim[J].JPhysEarth,1978,26(Supple):119.
[7] YOKOKURAT .Onsubductiondipangles[J].Tectonophysics,1981,77:6377.
[8] 李乃胜.冲绳海槽海底热流研究[J].海洋学报,1992,14(4):8793.
[9] 周祖翼,廖宗延,金性春,等.冲绳海槽-弧后背景下大陆张裂的最高阶段[J].海洋地质与第四纪地质,2001,21(1):5155.
[10] 翟世奎,干晓群.冲绳海底热流活动玄武岩的矿物学和岩石化学特征及其地质意义[J],海洋与湖沼,1995,26(2):115123.
[11] 梁瑞才,王述功,吴金龙.冲绳海槽中段地球物理场及其新生洋壳的认识[J].海洋地质与第四纪地质,2001,21(1):5764.
[12] 林美华,李乃胜.西菲律宾海中央断裂带地貌学研究[J].海洋地质与第四纪地质,1999,19(1):3944.
[13] DAVIDHowellG .环太平洋地区构造地层地体[M].吴正文等译.北京:中国地质大学出版社,1991.
[14] 小田诚也,等编.海洋底板块构造[M].于纯仁,等译.北京:地质出版社,1986.111161.
[15] 马宗晋,杜品仁.地质力学的方法与实践(第四篇(下))·现今地壳运动问题[M].北京:地质出版社,1994.1622.
[16] 黄玉昆编译.西太平洋现代地壳运动[M].北京:科学出版社,1985.3749.
[17] TOMODAY .MapoffreeairandbouguergravityanomaliesinandaroundJapan(1/300000coloredmaps)[M].Tokyo:UnivTokyoPress,1973.
[18] JEANCS .BackarcextentionintheOkinawaTrough[J].JournalofGeophysicalResearch,1987,92(B13):10411063.
[19] 杨文达,王振宇,曾九岭.冲绳海槽轴线浅地质特征[J].海洋地质与第四纪地质,2001,21(2):16.
[20] BALLYAW ,等编.板块内部动力学[M].贺敬辉,等译.北京:地震出版社,1990.1892.
[21] BURKEKC .Aulacogensandcontinentalbreakup[J].ARevEarthPlanetSci,1977,5:371396.
[22] DENN ,HOTTAH .SeismicandreflectionevidencesupportingplatetectonicsinHokkaido[J].PapMetGeo phys,1973,24:3154.~~
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