郯庐断裂带晚第三纪以来的浅部挤压活动与深部过程
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摘要
郯庐断裂带晚第三纪以来持续遭受着挤压 ,使前期大规模的断陷盆地抬升、消亡 ,近代还是中国东部最大的地震活动带。断裂带所遭受的近WE向的挤压 ,是西太平洋弧后扩张和印度板块向北碰撞中的构造挤出作用产生的区域动力。断裂带在新生代挤压活动中切入上地幔 ,出现了地幔剪切、地幔交代、部分熔融等深部过程 ,最终形成了挤压背景下的陆内断裂带大规模的玄武岩喷发
Thrusting time of the Tan Lu fault zone has been a controversial issue for long. Recently, many lines of evidence has proved that wide spread compression initiated on the fault zone between Eogene and Neogene, which has given rise to the uplift and consumption of many previous large faulted basins. Since Neogene period the fault zone has continued to suffer from compression, which resulted in many times of thrusting on the fault. The fault zone is currently the largest seismically active belt in eastern China. The compressive activities on the fault zone were dominated by thrusting with small amount of right lateral displacement sometimes and were often associated with the development of NW striking left lateral wrench faults. Margins of basins on the fault zone were intensely involved in the thrusting which caused the formation of shuttered zone and folds. Measurements of paleostress and present stress fields show that the fault zone has suffered nearly E W compression since Neogene due to the back arc spreading of the west Pacific Ocean and tectonic extrusion produced by the northward collision of the Indian Plate. Basalt eruption extensively occurred along the fault zone in Cenozoic, indicating that the fault zone cuts deeply into the upper mantle. Lithological character of the Cenozoic basalts demonstrates that the cutting depth of the fault increased from Paleogene to Quaternary gradually. Geoscience transects reveal obvious intensification of asthenoshperic upwelling beneath the Tan Lu fault zone, which demonstrates that the fault zone cut through the entire lithosphere. Deformed mantle derived xenoliths, such as mylonitic peridotite xenolith, in the basalts reflect that mantle shearing appeared in mantle involved by the fault. Metasomatic minerals in the xenoliths as well as geochemical features of the basalts and xenoliths all suggest that the involved mantle experienced extensive metasomatism. The mantle shearing and metasomatism are related closely and help each other. They also help partial melting in the involved mantle. Under these backgrounds, large scale partial melting appeared in the upper mantle involved by the fault zone. At last, large scale basalt eruption took place along the intracontinental fault zone under the compressive setting. Therefore, integrate active processes of the fault zone since Neogene consist of the thrusting, basin inversion and basalt eruption near the surface as well as the upper mantle shearing, metasomatism and partial melting at deeps.
引文
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