南沙微板块边界的动力学演化
On dynamic process and boundary faults’ kinematic characteristics of Nansha microplate
-
摘要: 南沙微板块的四周为性质不同的超壳边界断裂所围限,北为长龙-黄岩扩张断裂带,南为八仙-巴兰-约克-库约推复断裂带,西为万安-纳土纳走滑拉张断裂带,东为马尼拉-班乃走滑挤压断裂带,它们共同以南沙软流圈顶面为拆离面.该微板块在新生代的动力学过程可分为四个阶段:K2-E21,南沙微板块沿北部的康泰-双子-雄南断裂带伸展,裂离华南-印支陆缘,古南海向南俯冲,西布增生楔形成;E22-E31,西南次海盆沿长龙扩张脊断裂带扩张,西布增生楔碰撞造山;E32-N11,中央次海盆沿黄岩扩张脊断裂带扩张,米里增生楔形成,北巴拉望南缘“A”型俯冲;N12至现在,南部边界断裂大规模向北逆冲推复造山,南海扩张停止.
-
关键词:
- 南沙微板块 /
- 边界断裂 /
- 层滑-倾滑-走滑断裂系统 /
- 动力学过程 /
- 岩石圈根拆沉
Abstract: The features and present positions of the boundary faults of Nansha microplate and its dynamic process during Cenozoic are discussed.According to the view point of "interlayer-glide-dip-slip-strike-slip 4-dimensional associated fault systematic motion of laye-rblock tectonics",it is proposed that the microplate is enclosed by differe transcrustal faults and can be regarded as a typical Cenozoic microplate.Facts show that the northern boundary the micr oplate moves to the present location of Chang long-Huangy an seamount chain (spreading ridge fault zone) from Kangtai-Shuangzi-Xiongnan transcrustal normal dip-slip fault zone,Baxian-Baram-Yoca-Cuyo trascrustal reversed-slip thrust fault zone as the southern boundary,Wan'an-Natuna transcrustal strike-slip pullapatransfer zone as the western boundary and Manila-Panay transcrustal strike-slip compressional transfer zone as theastern boundary.These boundary fault zones take the same top layer of Nansha asthenosphere as their shared dtachmental layer.In the light of the viewpo int of multivariant dynamic force origin,the Cenozoic dynamic process the microplate can be divided into four stages.(1) K2-E21,the delamination of lower lithosphere of South Chin continental margin resulted in the microplateps dispersing away from the margin of SE China-Indochina continen paleo-South China Sea(SCS) southward subducting under Sunda craton in the SW section of the southern bounda and under the oceanic crust of eastern Calimantan-Sulawesi Sea in the SE section of the southern boundary respetively,and the formation of Sibuaccretion wedge.(2) E22-E31,eastward hydraulic-pressure-transfe-rtype creepo the mantle flew under Tibet plateau lithosphere,eastward strike-slip extrusion of East A sian lithosphere and equtorward longitudinal inertia for cecaused by the incr ease of the earthps rotation rate,all of these forces initiated thopening of SW subbasin of the SCS,Sibu accretion wedge's collision with Kuching zone and the formation of C gayan-Kalumpang-Tungku-Sulu volcanic arc.(3) E32-N11,the central subbasin of the SCS opened,Miriaccrtion wedge formed.Mean while,Sulawesi Sea northwards subducted under Sulu arccaused by northward driftin and compression of Australian plate,Sulu Sea opened in Cagayan-Suluarc.And the southern margin of N or Palawan continental block subducted under Cagayan volcanic ridge,like the A-type subjection.(4) N12 to present the collision of the Australian-derived Banggai-Sula block with the northernarm of Sulawesi caused the southe boundary fault zone of the microplate thrusting and orogenic movementon a large-scale.And the spreading of the SCS stopped. -
夏戡原,黄慈流南沙海区地质地球物理综合分析与油气资源南沙群岛及其邻近海区地质地球物理与油气资源[M].北京:科学出版社,1996 252 孙岩,施泽进,舒良树,等.层滑-倾滑断裂构造与油气地质研究[M].南京:南京大学出版社,1991 1～181 刘海龄,吴世敏,阎贫断裂研究最新进展与南海断裂研究展望[J].南海研究与开发,1998,(1):35～42 LIU Hai-ling, SUN Yan, GUO Ling-zhi, et al. On the boundary faults' kinematic characteristics and dynamic process of Nansha ultra-crust layer-block[J]. Acta Geologica Sinica, 1999, 73(4):452～463. 刘海龄,杨树康,周蒂,等.南沙北部伸展构造的基本特征及其动力学意义[J].高校地质学报,1998,4(1):64～72 姚伯初,曾维军,HAYESDE,等.中美合作调研南海地质专报[R]武汉:中国地质大学出版社,1994.1～204 TAYLOR B, HAYES D E. Origin and history of the South China Sea basin. Hayes D E, ed. The Tectonic and Geologic Evolution of Southeast Asian Seas and Islands, Part 2[J]. Geophys Monogr Ser, 1983, 27:23～56. 刘海龄南沙西部海域伸-缩型右旋走滑双重构造系统及其动力学过程[J].海洋地质与第四纪地质,1999,19(3):11～17. 刘光鼎.中国海区及邻域地质地球物理特征[M].北京:科学出版社,1992.1～424. RANGIN C, HUCHON P, PICHON X Le, et al. Cenozoic deformation of central and South Vietnam[J]. Tectonophyics,1995, 251:179～196. HUTCHISON Charles S. Geological evolution of Southeast Asia[M]. Oxford:Clarendon Press, 1989. 354. HUTCHISON Charles S. The Eocene unconformity on Southeast and East Sundaland [J]. Geol Soc Malaysia Bulletin,1992, 32:69～88. HARTONO H M S. Summary of tectonic development of Kalimantan and adjacent areas[J]. Energy, 1985, 10(3/4):341～352. 吴进民.南海西南部人字形走滑断裂体系和曾母盆地的旋转构造[A].南海地质研究(9)[M].武汉:中国地质大学出版社,1997.54～66. 彭学超,陈玲.南沙海域万安盆地地质构造持征[J].海洋地质与第四纪地质,1995,15(2):35～48 PUBELLIER M, QUEBRAL R, RANGIN C, et al. The Mindanao collision zone:a soft collision event within a continuous Neogene strike-slip setting[J]. J of SE Asian Eath Sci Sp Iss, 1991, 6(314):239～248. MOORE G F, SILVER E A. Collision processes in the northern Molucca Sea[A]. Hayes D E, ed. The Tectonic and Geologic Evolution of Southeast Asian Seas and Islands, Geophysical Monograph, 27[C]. Washington, D C, 1983. 360～372. 郭令智,施央申,马瑞士.西太平洋中、新生代活动大陆边缘和岛弧构造的形成及演化[J].地质学报,1983,(1):11～21. ZHOU Di, RU Ke, CHEN Han-zong. Kinematics of Cenozoic extension on the South China Sea continental margin and its implications for the tectonic evolution of the region[J]. Tectonophysics, 1995, 4598C:117. 刘海龄,杨树康,刘昭蜀,等.中、新生代华南陆缘离散地块的基本特征及演化过程[J].热带海洋,1991,10(3):37～43. 刘海龄南沙超壳层块边界断裂的运动学与动力学特征[J].热带海洋,1999,18(4):8～16 李建国,周永胜,宋瑞卿,等.岩石圈塑性流动网络与多层构造变形的物理模拟[J].地震地质,1997,19(3):248～～258 李扬鉴,张星亮,陈延成.大陆层控构造导论[M].北京:地质出版社,1996.1～164 RANGIN C. Southeast Asian Marginal Basins (South China, Sulu and Celebes Seas):new data and interpretations[A]. Jin Xiang-long, ed. Marine Geology and Geophysics of the South China Sea[M]. Beijing:China Ocean Press, 1990.38～51. RICHARDSON A. Lithosphere structure and dynamics of the Banda arc collision zone, Eastern Indonesia[J]. Geol Soc Malaysia Bull, 1993, 33:105～118. JACOBSON G. Gunung Kinabalu, Sabah, Malaysia. Geol Suru Malaysia Rept[R], No. 8. 1970. 1～111. -
点击查看大图
计量
- 文章访问数: 975
- HTML全文浏览量: 1
- PDF下载量: 1266
- 被引次数: 0
下载:
