| 鲁西晚寒武世风暴事件的沉积记录 |
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| 引用本文： | 文琼英,孟繁利.鲁西晚寒武世风暴事件的沉积记录[J].吉林大学学报(地球科学版),1992(1). |
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| 作者姓名： | 文琼英 孟繁利 |
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| 作者单位： | 长春地质学院能源系
(文琼英)，吉林省地矿局研究所(孟繁利) |
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| 摘 要： | 鲁西晚寒武世为一浅海碳酸盐台地,其沉积体层序中广泛发育风暴事件沉积。岩石类型有近积型粗颗粒风暴岩、次近积型粗颗粒风暴岩、次远积型风暴岩(风暴碎屑流沉积)及风暴浊积岩(风暴密度流沉积)。尚有风暴介壳滩及风暴再改造滩。各岩石特有的组构分别指示它们是在风暴中心涡旋、卷扬以及巨大涌浪的推挤、倾倒作用下快速停积而成。其次,则是风暴衰减后的重力流动搬运再沉积的。近积型与次近积型风暴岩最发育,表明当时鲁西主要是风暴中心控制区,所在华北地块的古纬度(北15°～30°)也证实是风暴主要作用区。粗算飓风的产生周期为1350～2640年发生一次,可与现代墨西哥湾等地类比。
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| 关 键 词： | 晚寒武世 浅海台地 鲁西 风暴岩 |
SEDIMENTARY RECORDS OF STORM EVENTS DURING LATE CAMBRIAN IN WESTERN SHANDONG PROVINCE |
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| Wen Quongying Meng Fanli.SEDIMENTARY RECORDS OF STORM EVENTS DURING LATE CAMBRIAN IN WESTERN SHANDONG PROVINCE[J].Journal of Jilin Unviersity:Earth Science Edition,1992(1). |
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| Authors: | Wen Quongying Meng Fanli |
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| Abstract: | The Late Cambrian sedimentath rock in western Shandong province represent an envirnment of a shallow oceanic carbonate platform, Storm event deposits were widely distributed in the sequence. On the basis of texture and composition study the storm deposit can be classified as follows; 1. Storm proximal coarse grain lime-store 2. Storm subproximal coarse grain limestone 3. Subdistal tempestite (Storm debris flow deposits) 4. Storm turbidite (Storm density current deposit) 5. Storm coquina bank limestone 6. Storm reworked Doldtic shoal limestone. The specific fabrics of these limestones show that they were resulted from rapid deposition in storm central vortex aided by actions of crowding and pouring of great surge waves,or secondly also resulted from redeposition of gravity flows after storm declined.In the Late Cambrian sequence, storm proximal coarse grain limestone and storm subproximal coarse grain limestone were very well developed. It shows the wistern Shandonge region was once under the central of Storm cemtral regime at that times. The Late Cambrian paleolatitude of North China Platform (10-30N)in which Shandong was included also proves that this area was the region hitted by storm. It is calculated that this kind of strong hurricant occurred once per 1350-2640 years,It is comparable with that in the present Gulf of Mexico. |
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| Keywords: | Late Cambrian Shallow oceanic carbonate platform yempestite west Shandong |
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