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| 太原西山七里沟晚古生代腕足动物群落及其古环境意义 | |
| 引用本文： | 高金汉,王训练,冯国良,张海军,刘旭东.太原西山七里沟晚古生代腕足动物群落及其古环境意义[J].地质通报,2005,24(6):528-535. |
| 作者姓名： | 高金汉 王训练 冯国良 张海军 刘旭东 |
| 作者单位： | 1. 中国地质大学地球科学与资源学院,北京,100083 2. 中国石油天然气勘探开发公司,北京,100035 3. 中国科学院青藏高原研究所,北京,100085 4. 中国地震局地壳应力研究所,北京,100085 |
| 基金项目： | 国家自然科学基金项目(编号:40472065)，中国石油天然气股份有限公司“十五”重点研究项目资助的成果。 |
| 摘 要： | 太原西山七里沟晚古生代剖面含有丰富的腕足动物化石，共可识别出13个底栖生物群落。个体生态、行为习性、群落结构和岩性、岩相组合特征的研究表明，这些群落的生态位介于BA1-BA3之间。控制腕足动物群落分布和相互取代的最主要因素是相对海平面变化。由于海平面升、降变化的速度、幅度和持续时间的不同，群落之间的这种相互更替既有突变的，也有渐变的，既可以发生在不同的旋回之间，也可以发生在同一个海水进、退旋回内。根据这些底栖生物群落生态位所显示的水深变化和剖面相序结构，该剖面本溪期至山西期共经历了11次海水进、退旋回，其中以庙沟期海侵规模最大，最大估水深10-20m，毛儿沟下灰岩与庙沟灰岩均为这一旋回的产物。 |
| 关 键 词： | 腕足动物 海平面变化 太原西山 七里沟剖面 石炭纪—二叠纪 |
| 文章编号： | 1671-2552(2005)06-0528-08 |
| 修稿时间： | 2005年1月19日 |
Late Paleozoic brachiopod communities in the Qiligou section of the Western Mountains, Taiyuan, Shanxi, China, and their paleoenvironmental significance |
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| GAO Jinhan,WANG Xunlian,FENG Guoliang,ZHANG Haijun,LIU Xudong. School of Earth Sciences and Resources,China University of Geosciences,Beijing,Chin,. China Petroleum and Natural Gas Exploration and Development Company,Beijing,China. Institute of Tibetan Plateau Research,Chinese Academy of Science,Beijing,Chin,. Institute of Crustal Dynamics,China Seismological Bureau,Beijing,China.Late Paleozoic brachiopod communities in the Qiligou section of the Western Mountains, Taiyuan, Shanxi, China, and their paleoenvironmental significance[J].Geologcal Bulletin OF China,2005,24(6):528-535. | |
| Authors: | GAO Jinhan WANG Xunlian FENG Guoliang ZHANG Haijun LIU Xudong School of Earth Sciences and Resources China University of Geosciences Beijing Chin China Petroleum and Natural Gas Exploration and Development Company Beijing China Institute of Tibetan Plateau Research Chinese Academy of Science Beijing Chin Institute of Crustal Dynamics China Seismological Bureau Beijing China |
| Institution: | GAO Jinhan,WANG Xunlian,FENG Guoliang,ZHANG Haijun,LIU Xudong. School of Earth Sciences and Resources,China University of Geosciences,Beijing,Chin,. China Petroleum and Natural Gas Exploration and Development Company,Beijing,China. Institute of Tibetan Plateau Research,Chinese Academy of Science,Beijing,Chin,. Institute of Crustal Dynamics,China Seismological Bureau,Beijing,China |
| Abstract: | Abundant Late Paleozoic brachiopod fossils are contained in the Qiligou section of the Western Mountains, Taiyuan, Shanxi, and 13 benthic communities have been recognized. According to a detailed study of the autoecology, ethology and community structure, combined with an analysis of the lithology and sedimentary facies, the ecological positions of these communities are located between BA1 and BA3. The main controlling factor of the distribution and mutual replacement of the brachiopod communities is relative sea-level change. Because of differences in velocity, amplitude and duration of sea-level changes, the mutual replacement of two adjacent benthic communities may be not only sudden but also gradual and can occur between two different sedimentary cycles or in the same cycle of marine transgression and regression. The water-depth changes indicated by the ecological positions of these benthic communities and analysis of the facies sequence structure of the section suggest that 11 marine transgression and regression cycles occurred from the Benxian to Shanxian stages, of which the Miaogouan stage witnessed the maximum sea transgression with an estimated maximum sea depth of 10-20 m. The lower Maoergou limestone and Miaogou limestone are both the product of this sedimentary cycle. |
| Keywords: | brachiopod relative sea-level change Western Mountains Taiyuan Qiligou section Late Paleozoic |
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