琼东南盆地地壳伸展因子计算及其伸展模式探讨
|
摘要
对伸展因子β的计算分析,可认识岩石圈的伸展变形特点。基于琼东南盆地具有"多米诺"伸展断层构造的5条反射地震剖面资料,利用"多米诺"伸展断层模式计算了上地壳伸展因子,其值分布在1.17～1.58之间;与对应位置的全地壳和岩石圈的伸展因子比较,结果显示上地壳、全地壳和岩石圈伸展因子三者之间存在差别,但不是简单的随深度增大,具体表现为盆地中北部的岩石圈伸展变形特点为岩石圈伸展因子大于全地壳大于上地壳,盆地西南部则表现为全地壳最大,岩石圈最小。通过计算,结合研究区相关研究成果,本文认为琼东南盆地岩石圈发生了随深度变化的伸展变形;不同构造位置的岩石圈伸展变形存在明显差异。
The calculation of stretching factors provides a feasible method to understand the extension and thinning of lithosphere. Based on the seismic profiles of the Qiongdongnan basin, the upper crust stretching factors are estimated by applying the domino-style fault block model, with results ranging from 1.17 to 1.58. The whole crust stretching factors and lithosphere stretching factors are also examined on the domino-style faults positions. The results demonstrate that there exists depth related difference, but not simply increase with depth, which indicates a heterogeneous lithospheric stretching. In conclusion, the depth dependent model is likely operational in the Qiongdongnan basin.
The calculation of stretching factors provides a feasible method to understand the extension and thinning of lithosphere. Based on the seismic profiles of the Qiongdongnan basin, the upper crust stretching factors are estimated by applying the domino-style fault block model, with results ranging from 1.17 to 1.58. The whole crust stretching factors and lithosphere stretching factors are also examined on the domino-style faults positions. The results demonstrate that there exists depth related difference, but not simply increase with depth, which indicates a heterogeneous lithospheric stretching. In conclusion, the depth dependent model is likely operational in the Qiongdongnan basin.
引文
李奋其.2003.中国西北部南北向伸展构造存在的新证据-酒泉早白垩世半地堑断陷成因初探.沉积与特提斯地质,23(2):35-42.
李思田,林畅松,张启明,杨士恭,吴培康.1998.南海北部大陆边缘盆地幕式裂陷的动力过程及10Ma以来的构造事件.科学通报,43(8):797-810.
林畅松,张艳梅.1997.盆地沉降史模拟分析//龚再升,李思田.南海北部大陆边缘盆地分析与油气聚集.北京:科学出版社:75-86.
龙根元,吴世敏,刘兵,郭翔燕.2010.琼东南盆地半地堑特征及其动力学探讨.大地构造与成矿学,34(1):48-54.
谢文彦,张一伟,孙珍,姜建群.2007.琼东南盆地断裂构造与成因机制.海洋地质与第四纪地质.27(1):71-78.
魏魁生,崔旱云,叶淑芬,厉大亮,刘铁树,梁建设,杨国忠,武丽,周小鹰,郝运轻.2001.琼东南盆地高精度层序地层学研究.地球科学,26(1):59-66.
吴世敏,杨恬,周蒂,丘学林,夏斌.2005.南海南北共轭边缘伸展模型探讨.高校地质学报,11(1):105-110.
张中杰,刘一峰,张素芳,范蔚茗,陈林.2010.琼东南盆地地壳伸展深度依赖性及其动力学意义.地球物理学报,53(1):57-66.
Axen G J.1988.The geometry of planar domino-style normal faults above a dipping basal detachment.Journal of Struc-tural Geology,10(4):405-411.
Clift P D and Lin H.2001.Preferential mantle lithosphere ex-tension under the South China margin.Marine and Petrole-um Geology,18(8):929–945.
Haq B U,Hardenbol J and Vail P R.1987.Chronology of fluctua-ting sea-levels since the Triassic.Science,235:1156-1167.
Hayes D E,Nissen S S,Buhl P,Diebold J,Yao B,Zeng Wand Chen Y.1995.Through going crustal faults along thenorthern margin of the South China Sea and their role incrustal extension.Journal of Geophysical Research,100(B11):22435-22446.
Mckenzie D.1978.Some remarks on the development of sedi-mentary basins.Earth and Planetary Science Letters,40:25-32.
Schlische R W.1991.Half-graben basin filling models:Newconstraints on continental extensional basin development.Basin Research,3:123-141.
Schlüter H U,Hinz K and Block M.1996.Tectono-stratigraph-ic terranes and detachment faulting of the South China Seaand Sulu Sea.Marine Geology,130:39-51.
Su D,White N and McKenzie D.1989.Extension and subsid-ence of the Pearl River Mouth Basin,northern South ChinaSea.Basin Research,2:205-222.
Wernicke B.1985.Uniform-sense normal simple shear of thecontinental lithosphere.Can J Earth Sci,22:108-125.
Wernicke B and Burchfiel B C.1982.Modes of extensional tec-tonics.Journal of Structural Geology,4:105-115.
李思田,林畅松,张启明,杨士恭,吴培康.1998.南海北部大陆边缘盆地幕式裂陷的动力过程及10Ma以来的构造事件.科学通报,43(8):797-810.
林畅松,张艳梅.1997.盆地沉降史模拟分析//龚再升,李思田.南海北部大陆边缘盆地分析与油气聚集.北京:科学出版社:75-86.
龙根元,吴世敏,刘兵,郭翔燕.2010.琼东南盆地半地堑特征及其动力学探讨.大地构造与成矿学,34(1):48-54.
谢文彦,张一伟,孙珍,姜建群.2007.琼东南盆地断裂构造与成因机制.海洋地质与第四纪地质.27(1):71-78.
魏魁生,崔旱云,叶淑芬,厉大亮,刘铁树,梁建设,杨国忠,武丽,周小鹰,郝运轻.2001.琼东南盆地高精度层序地层学研究.地球科学,26(1):59-66.
吴世敏,杨恬,周蒂,丘学林,夏斌.2005.南海南北共轭边缘伸展模型探讨.高校地质学报,11(1):105-110.
张中杰,刘一峰,张素芳,范蔚茗,陈林.2010.琼东南盆地地壳伸展深度依赖性及其动力学意义.地球物理学报,53(1):57-66.
Axen G J.1988.The geometry of planar domino-style normal faults above a dipping basal detachment.Journal of Struc-tural Geology,10(4):405-411.
Clift P D and Lin H.2001.Preferential mantle lithosphere ex-tension under the South China margin.Marine and Petrole-um Geology,18(8):929–945.
Haq B U,Hardenbol J and Vail P R.1987.Chronology of fluctua-ting sea-levels since the Triassic.Science,235:1156-1167.
Hayes D E,Nissen S S,Buhl P,Diebold J,Yao B,Zeng Wand Chen Y.1995.Through going crustal faults along thenorthern margin of the South China Sea and their role incrustal extension.Journal of Geophysical Research,100(B11):22435-22446.
Mckenzie D.1978.Some remarks on the development of sedi-mentary basins.Earth and Planetary Science Letters,40:25-32.
Schlische R W.1991.Half-graben basin filling models:Newconstraints on continental extensional basin development.Basin Research,3:123-141.
Schlüter H U,Hinz K and Block M.1996.Tectono-stratigraph-ic terranes and detachment faulting of the South China Seaand Sulu Sea.Marine Geology,130:39-51.
Su D,White N and McKenzie D.1989.Extension and subsid-ence of the Pearl River Mouth Basin,northern South ChinaSea.Basin Research,2:205-222.
Wernicke B.1985.Uniform-sense normal simple shear of thecontinental lithosphere.Can J Earth Sci,22:108-125.
Wernicke B and Burchfiel B C.1982.Modes of extensional tec-tonics.Journal of Structural Geology,4:105-115.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心