| 华北地台中寒武世鲕滩碳酸盐旋回沉积、古海平面变动控制及旋回年代学研究 |
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| 引用本文： | 柳永清,孟祥化,葛铭.华北地台中寒武世鲕滩碳酸盐旋回沉积、古海平面变动控制及旋回年代学研究[J].地质科学,1999,0(4):442. |
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| 作者姓名： | 柳永清 孟祥化 葛铭 |
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| 作者单位： | 中国地质科学院地质研究所!北京100037(柳永清)，中国地质大学!北京100083(孟祥化，葛铭) |
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| 摘 要： | 华北地台中寒武世鲕滩碳酸盐沉积序列中具有特征的低频(级)和高频(级-级)旋回层序叠加样式和规律。旋回层序内部的沉积构成、微相组构、成岩特点以及高频旋回的复合、叠加严格受复合海平面变动的控制。巨厚鲕滩形成于低频海平面变化的回落时期,但复合叠加于低频海平面变化中的级海平面变化更直接地控制着鲕滩建造的时空发育、进积迁移。鲕滩微相中鲕粒组构特征则主要与高频海平面变化相关。鲕滩高频海平面变化旋回层序的厚度频率分布、不同级次旋回叠加比率和样式以及大范围空间上的连续可比性规律可能说明它们受地球轨道参数周期性变动的控制。轨道旋回层序具有的特定变化时间周期和频率使得旋回地层学具有了年代学意义,可以对重要地层段、事件层及生物带高精度测年。应用旋回地层学的研究得到了中寒武世毛庄\徐庄\张夏期的界线(面)年龄,即毛庄(期)\徐庄(期)为530.50Ma、徐庄(期)\张夏(期)为526.90Ma,与前人应用生物年代地层学等方法得到的年龄值极为一致。
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| 关 键 词： | 华北 中寒武世 碳酸盐鲕滩 旋回 海平面控制 旋回年代学 |
| 修稿时间： | 1997-11-20; |
THE SEA-LEVEL CHANGE FORCING CYCLES OF OOLITIC CARBONATE AND CYCLOC-HROLOGICAL APPLICATIONS |
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| Liu Yongqing.THE SEA-LEVEL CHANGE FORCING CYCLES OF OOLITIC CARBONATE AND CYCLOC-HROLOGICAL APPLICATIONS[J].Chinese Journal of Geology,1999,0(4):442. |
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| Authors: | Liu Yongqing |
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| Institution: | 1. Geology Institute, CAGS, Beijing, 100037;2. China University of Geosciences, Beijing, 100083 |
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| Abstract: | A series of low frequency (3rd order) and high frequency (4th 6th order) cycles are stacked within the Mid Cambrian oolitic carbonate depositional succession in the North China carbonate platform. The sedimentary componments, microfacies, diagnasis of cyclic sequences and the stacked pattern of cyclic sequences are drived by the composite sea level fluctuation. Research indicated that the maximum oolitic carbonates are dominately present during the regression of low frequency sea level change, and the 4th order sea level stacked within low frequency fluctuation indeed forces the formation, distribution and migration of oolitic shoals while the microfacies of ooids is related to the high frequency sea level osicillations. The two ranks of cycle average thickness, stacked patern and ratio of various cycle orders and wide correlation across the platform suggest that they are related to Milankovitch orbital cycle.The implication of the regularly periodities of orbital cycles is used to date the duration of strata internals, event layer and bio zone et al. The chronology of Mid Cambrian stages or 3rd order cyclic sequence boundary is estimated by the cyclostratigraphy approach in the study ,i.e, Xuzhuangian/Maozhuangian=530.50 Ma, Zhangxian/Xuzhuangian= 526.90Ma, and they are well correspond to the results given by biostratigraphy zones. |
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| Keywords: | North China Mid Cambrian Oolitic carbonate Cyclic sequences Cyclostratigraphy |
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