库车前陆冲断带西部却勒盐推覆体变形特征分析

发布时间：2018-01-28 07:28

本文关键词： 库车前陆冲断带却勒盐推覆体察尔汗盐席分段性变形特征　出处：《中国地质》2017年01期 　论文类型：期刊论文

【摘要】：库车前陆冲断带西部发育中国最好的地表盐构造,可作为盐构造研究的天然实验室。前人对本区盐构造的研究主要集中于地下,包括地下盐构造样式的识别、地下盐构造分段性研究及盐构造形成机制研究等,而对于地表盐构造的研究相对较少。文章在前人研究的基础上,通过详细的野外填图,并辅以地震解释、遥感解译等方法,对库车前陆冲断带西部却勒盐推覆体变形特征进行分析,认为却勒盐推覆体的发育受控于却勒逆冲断层,库姆格列木群盐岩随逆冲断层出露地表。盐推覆体在东西向上构造差异较大,具有明显的分段性,在推覆体的中、西部,推覆体上盘地层发育齐全,盐岩仅沿推覆体逆冲前缘出露地表,属于典型的露趾增生型盐席;而在推覆体东部的察尔汗盐席处,盐上地层被剥蚀,盐岩出露地表后在重力的驱动下向周缘流动,属于溢流增生型盐席。察尔汗盐席受地表径流和降水作用影响明显,发育大量溶洞和盐山构造,并以"脉动流"的形式向前增生。盐内能干层的变形特征是反映盐岩流动性强弱的指标,盐推覆体东部察尔汗盐席盐内能干层变形样式更复杂,盐岩的流变性更强。缺少厚层顶板的限制和受降水及地表径流的充分影响是察尔汗盐席盐岩流变性较强的原因。
[Abstract]:The west of Kuqa Foreland thrust belt developed the best surface salt structure in China, which can be used as a natural laboratory for salt structure research. Previous researches on salt structure in this area mainly focus on underground, including the identification of underground salt structure style. There are few studies on the salt structure of the ground surface. Based on the previous studies, detailed field mapping and seismic interpretation are used in this paper. By means of remote sensing interpretation and other methods, the deformation characteristics of the taule salt nappe in the west of Kuqa Foreland thrust belt are analyzed, and it is concluded that the development of the nappe is controlled by the Zeller thrust fault. The salt rocks of the Kumgarimu Group emerge from the surface with thrust faults. The salt nappe has great structural difference in the east and west, and has obvious segmental characteristics. In the middle and west of the nappe, the upper plate of the nappe is well developed. The salt rock appears only along the thrust front of the nappe and belongs to the typical accretive table. At the Chaerhan salt mat in the east of the nappe, the upper salt strata are denuded, and the salt rocks flow to the periphery driven by gravity. Chaerhan salt mat is obviously influenced by surface runoff and precipitation, and a large number of karst caves and salt mountain structures are developed. The deformation characteristics of the energy dry layer in salt are the indexes reflecting the fluidity of salt rock, and the deformation pattern of the energy dry layer in the salt sheet of Chaerhan salt sheet in the eastern part of salt nappe is more complicated. The lack of thick roof and the sufficient influence of precipitation and surface runoff are the main reasons for the strong rheology of salt rock in Chaerhan salt sheet.
【作者单位】：造山带与地壳演化重点实验室北京大学地球与空间科学学院;中国石化集团新星石油有限责任公司新能源研究院;中国石油塔里木油田公司勘探开发研究院;
【基金】：国家重点基础研究发展计划“973计划”项目(2009CB219302) 中国地质调查局项目(DD20160175-1-1)联合资助~~
【分类号】：P618.13
【正文快照】： (1.Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,School of Earth and Space Sciences,PekingUniversity,Beijing 100871,China;2.SINOPEC Star Petroleum Co.,Ltd.(Sinopec Star),New Energy Researching Institude,Beijing100083,China;

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