Preliminary Investigation and Study on the Characteristics of Mud Volcanoes and the Cause of Tuosuo and Keluke Lakes in Lian Lake Area, Delingha
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摘要: 为调查和研究德令哈莲湖地区地质背景、地质演化及可鲁克湖-托素湖成因，通过对莲湖地区野外地形地貌、地质构造调查，结合石油地震勘探、钻井等资料，发现大柴旦-托素湖断裂带沿线分布有多处“泥火山”，其分布明显受到断裂带的控制；该地区石炭纪以来经历了伸展、褶皱抬升、伸展断陷、挤压坳陷、弱挤压反转、弱断陷、坳陷、强挤压反转等多个构造演化阶段，而托素湖、可鲁克湖的形成与区域的构造演化紧密相关，特别是新近系以来受喜马拉雅运动的影响，随着岩浆的侵入，在逆冲推覆构造的作用下，第三纪地层发生明显隆起，欧龙布鲁克山、埃姆尼克山等山脉大幅度抬升，莲湖被分为两部分，这是托素湖、可鲁克湖形成的最主要原因。Abstract: What mechanisms caused the formation of the Keluke-Tuosuo Lakes is still not known clearly, due to the lack of deeply and systematic studies.To understand the geological background and evolution of the Keluke-Tuosuo Lakes, the field geomorphology and geological characteristics of Lian Lake area have been analyzed through combining with the seismic data from oil exploration and drilling. Several mud volcanoes have been found in the area along Dachaidan-Tuosu Lake fault zone, which are obviously controlled by the active faults.And then, the main reasons for the formation of the Tuosu and Keluke Lakes have been discussed. Since the Carboniferous epoch, the Lian Lake area has experienced several tectonic evolution histories, such as extension, folding and uplift, rifting, compression and depression, weak reverse, weak rift-sagging, depression, and strong reverse. Thus, the formations of the Tuosuo and Keluke Lakes were tightly related to the regional tectonic evolution, especially from the impact from the Himalayas since Neogene period. As the results of the magma intrusion and over thrust, the tertiary strata were uplifted obviously.And then, the Oulongbuluke Mountain, Aimunike Mountain, and some other mountains uplifted significantly, and the Lian Lake area was divided into two parts.
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Keywords:
- Lian Lake /
- mud volcano /
- tectonic evolution /
- seismic section /
- interpretation /
- cause
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