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| 渡口及其邻近地区地壳浅层结构的研究 | |
| 引用本文： | 尹周勋,滕吉文,熊绍柏. 渡口及其邻近地区地壳浅层结构的研究[J]. 地球物理学报,1987,30(01): 22-30, |
| 作者姓名： | 尹周勋 滕吉文 熊绍柏 |
| 作者单位： | 中国科学院地球物理研究所,北京 |
| 摘 要： | 为了研究攀枝花—西昌构造带的地壳与上地幔顶部结构,在西起丽江东至者海全长350km的测线上进行了爆炸地震探测。本文利用所取得的六条地震记录剖面的Pg波组,研究测线下方地壳浅层结构。采用层状垂直梯度和横向不均匀模型,用理论走时和射线追踪方法来拟合实测Pg走时资料。得到深度为10km范围的地壳浅层结构和速度分布。 结果表明,该区地表P波速度以渡口至华坪一带为最高,达6.00km/s。向东西两侧逐步减小,东至者海为5.20km/s,西至丽江降为3.50km/s。局部地段因构造影响速度值有些起伏。从浅层结构和速度分布可见,该区存在箐河—程海、绿汁江、安宁河和甘洛—小江等深断裂带,并向地壳深部延伸。等速度线图表明,该区上地壳中有一高速岩体存在。攀枝花钒、钛、铁矿的富集以及其他热液型矿床的分布很可能与此有关。 |
| 关 键 词： | 攀西构造带 地震测深 射线追踪 速度结构 钒钛铁矿 |
| 收稿时间： | 1985-12-15 |
| 修稿时间： | 1986-02-26 |
A STUDY ON FINE STRUCTURE IN THE UPPER CRUST OF DUKOU AND ITS ADJACENT REGIONS |
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| YIN ZHOU-XUN,TENG JI-WEN,XIONG SHAO-BAI. A STUDY ON FINE STRUCTURE IN THE UPPER CRUST OF DUKOU AND ITS ADJACENT REGIONS[J]. Chinese Journal of Geophysics (in Chinese),1987,30(01): 22-30, | |
| Authors: | YIN ZHOU-XUN TENG JI-WEN XIONG SHAO-BAI |
| Affiliation: | Institute of Geophysics,Acadcmia Sinica,Beijing |
| Abstract: | In order to study the deep crustal stru9ture in the Pan-Xi tectonic belt,a explosion seismic spunding along a profile of 350 km long in the Dukou region was conducted in 1984. The east-west profile from Zhehai to Lijiang was arranged and six seismic sections in the profile were obtained. In this paper,first seismic phases in records are analysed to study the upper crustal structure beneath Dukou in detail. In data processing we used different methods,such as theo-rerical travel time and ray tracing,for a model with lateral inhomogeneity and vertical gradient of velocity to fit the observed travel time data. Fine structures of the upper crust and velocity distributions down to 10 km deep are obtained.In 'the upper crust there exist several deep faults,which extend to the lower crust. The P wave velocity of 6.00 km/s between Dukou and Huaping is higher than those at the two ends of the profile （5.20 km/s in Zhehai and 3.5 km/s in Lijiang）. The lateral variation of velocity seems to be attributed to tectonic processes. It is noted that there is a geological body with high velocity in the region between Dukou and Huaping,which is probably related to the upward .movement and concentration of magma from the upper mentle. It can be inferred that a great deal of mineral of sefstromite deposited in the Panzihua zone have somewhat relation with the above gebdynamic processes. |
| Keywords: | Pai-Xi tectonic belt Seismic soundifig Ray tracing Velocity structure Sefstromite |
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