| 鲁西陆表海盆地高分辨率层序划分与海侵过程成煤特点 |
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| 引用本文： | 李增学,魏久传,韩美莲.鲁西陆表海盆地高分辨率层序划分与海侵过程成煤特点[J].沉积学报,2000,18(3):362-368. |
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| 作者姓名： | 李增学 魏久传 韩美莲 |
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| 作者单位： | 山东科技大学地球信息科学与工程学院 山东泰安 271019 |
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| 基金项目： | 国家自然科学基金;49872057; |
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| 摘 要： | 晚石炭世至早二叠世华北陆表海盆地的高频海平面变化,是盆地充填和聚煤作用的主要控制因素,因而形成了旋回结构十分清楚的含煤层序。本文运用高分辨率层序地层学的思路、分析技术,研究了鲁西陆表海盆地含煤地层的高分辨率层序地层学特征,识别和划分了中长期和中、短期基准面旋回。研究表明,突发性的海侵事件对陆表海盆地聚煤作用具有重要影响,海侵过程成煤为鲁西煤聚积的显著特点。
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| 关 键 词： | 高分辨率层序 海侵过程成煤 基准面旋回 鲁西 |
| 文章编号： | 1000-0550(2000)03-0362-07 |
| 收稿时间： | 1999-01-07 |
| 修稿时间： | 1999年1月7日 |
The Division of High- resolution Sequences and the Transgressive CoalFormation in the Epicontinental Basin of the Western Shandong Province |
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| LI Zeng-xue,WEI Jiu-chuan,HAN Mei-lian.The Division of High- resolution Sequences and the Transgressive CoalFormation in the Epicontinental Basin of the Western Shandong Province[J].Acta Sedimentologica Sinica,2000,18(3):362-368. |
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| Authors: | LI Zeng-xue WEI Jiu-chuan HAN Mei-lian |
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| Institution: | Shandong Uniuersity of Science and Technology,Tai'an Shandong 271019 |
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| Abstract: | The high - frequency sea level changes in the North China epicontinental basin from the Late Carboniferous toEarly Permian are the main factors controlling the basin - filling and coal accumulation. The coal - bearing succes-sion, therefore, has distinct cycles. The sea level changes in the North China epicontinental basin were compositesea level changes. The long - term sea level changes are superposed by shorter - term cycles, the mid - term andshort - term sea level changes. There were short - term retrogressive events in the process of long term transgres-sive period, and multiple short periodic transgressive events superposed on the long - term transgressive period.Study shows that the base- level cycles in the North China epicontinental basin may be substitute by the relativesea level cycles, because the high - frequency sea level changes in the basin are the integrative results of the sea lev-d changes, the tectonic subsidence, the climate changes and the sediment supply. The later three factors, the tec-tonics, the climate and the sediment supply were relatively stable. The sea level changes, thus, become the domi-nant factor.
Using the thought and methodology of high - resolution sequence stratigraphy, the authors investigate thecharacteristics of the high- resolution sequence stratigraphy of the coal measures in the Western Shandong, identi-fy and divide the mid - long term and mid - short term base - level cycles. Three long - term base - level changeslead to the formation of three third order sequences. The mid- term base- level cycles are approximately corre-sponded to the systems tracts. Large - scale marine flooding events were caused by the mid - term base - level rise.
Because of the hysteresis of the deposition, the thick- bedded limestones were deposited in the period of maximumbase - level rises, which occurred three times in the history of the epicontinental basin, representing the depositionsof three times of maximum base- level rises. The outstanding feature of the paralic succession is the alternative oc-currences of the marine and terrestrial depositions, forming multiple cycles. That the marine layers directly super-posed on the coalbeds is another feature of the deposition in the epicontinental basin. Eighteen short - term base-level cycles may be recognized in the epicontinental succession of the Western Shandong. Most of cycles are asym-metric, seperated by episodic transgressive event surfaces, peatification event surfaces and large scope of scouringsurfaces. The short - term base- level cycles are of high frequency.
The identification and correlation of short - term base - level cycles help to the division of high - resolution se-quence. The study of the epicontinental paralic base - level cycles in the Western Shandong indicates that the eigh-teen short - term base - level cycles are corresponded to eighteen fifth - order sequences (corresponding to theparasequences). The episodic transgressive events have great effect on the coal accumulation in the epicontinentalbasin; coal formation in the transgressive process is the outstanding feature of the coal formation in the Western
Shandong coalfields. The transgressive coalbeds in the long - term base - level cycles develop in the transgressivesystems tracts, while the transgressive coalbeds in the short - term base- level cycles occur in the high stand sys-tems tracts. |
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| Keywords: | high-resolution sequence stratigraphy coal formation in the transgressive process base-level cycle Western Shandong Province |
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