| 右江盆地二叠纪生物礁层序地层学研究 |
| |
| 引用本文： | 覃建雄,曾允孚.右江盆地二叠纪生物礁层序地层学研究[J].地质科学,1999,34(4):506-517. |
| |
| 作者姓名： | 覃建雄 曾允孚 |
| |
| 作者单位： | 成都理工大学沉积研究所, 成都610059 |
| |
| 摘 要： | 通过右江盆地二叠纪生物礁层序地层研究表明,在海平面升降旋回的各个时期,均有生物礁的发育,并呈现各自特征的层序内部构型及成因格架。低水位礁仅发育于台盆背景,以加积丘礁或点礁为特色,常与混屑浊积岩、硅灰岩、硅泥岩共生;陆棚边缘礁发育于台盆和斜坡背景,与低水位期的相比,礁体较大,数量较多,因为该期相对稳定的底质和水动力条件对生物礁的萌生更具诱导作用;海侵期表现为伴随海平面向陆超覆而形成的向陆年轻化的海侵型台盆礁、斜坡礁、台缘礁、台内礁组合,具加积-退积型堆积序列,礁顶发育硬底、生物挠动面、海底熔蚀面、淹没面、水下中止面等,礁盖包括硅岩、火山碎屑浊积岩、放射虫岩、骨针岩、深水遗迹相、生物密集层、浮游相灰岩、含锰磷酸盐灰泥岩等,生长方式主要是追补式和中止式,以宝塔礁、链状礁、点礁为主;高水位礁以进积礁、加积礁和混积礁组合为特征,广泛发育于台内、台缘、斜坡、台盆等环境,具向上变浅序列,礁顶发育暴露面、岩溶面、冲刷侵蚀面、钙化壳、白云岩帽等,礁盖主要有残积相、潮坪相、浊积相、丘滩相等,规模大、分布广,以堤礁、环礁、马蹄形礁为主。
|
| 关 键 词： | 生物礁 层序格架 二叠纪 右江盆地 |
| 收稿时间： | 1997-08-25 |
| 修稿时间： | 1997-08-25; |
SEQUENCE STRATIGRAPHY OF PERMIAN REEFS, YOU JIANG BASIN,SOUTHWEST CHINA |
| |
| Qin Jianxiong,Zeng Yunfu,Cheng Hongde,Tian Jiangchun.SEQUENCE STRATIGRAPHY OF PERMIAN REEFS, YOU JIANG BASIN,SOUTHWEST CHINA[J].Chinese Journal of Geology,1999,34(4):506-517. |
| |
| Authors: | Qin Jianxiong Zeng Yunfu Cheng Hongde Tian Jiangchun |
| |
| Institution: | Institute of Sedimentology, Chengdu University of Technology, Chengdu 610059 |
| |
| Abstract: | An exhaustive study and related sequence stratigraphic model for Permian reef in the Youjiand Basin has been established in this paper.This model suggests that reef develops at every stage during sea level cycle and possesses all kinds of sequence internal architecture and genetic framework.LST reef characterized by ag gradational bioherm or patch reef,is generally associated with mixed clastic turbidite,siliceous limestone and mudstone.SMT reef,larger in size and relatively much in amount compared to LST reef,develops within inter-platform basin and slope because of better hydrodynamic environment during SMT;During transgression interplatform basin bioberm-reef complex continuously or discontinuously retrogrades towards ba sin margin and slope and then internal platform,and finally brings about fransgr assive bioherm-reef compler overlapping from basin to platform,including interpl atform-basin reef,slope reef,platform-edge reef and internal platform reefwith reefal top characterized by hardground,biodisturbation surface,submarine welded surface,flooding surface and give-up surface etc.Reef cap includes siliceous rock,pyroclastic turbidite,radiomite,deep trace facies,biocondensed bed,plankton-facies limestone etc.HST reef characterized by a great quantity of offlappinga ggradation-progradation-compoundreef association,including barrier reef,table reef,horeseshoe reef,atoll,and bioberm reef with various vertical and lateral zonation.Reefal top includes subaerial surface,paleocarstic surface,erosion surface,caliche and dolostone cap etc.Reefal cap mainly includes eluvial facies,tidalfacies,turbidites and bioberm-beach facies etc. |
| |
| Keywords: | Reefs Sequencestratigraphic framework Permian The Youjang Basin |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《地质科学》浏览原始摘要信息 |
| 点击此处可从《地质科学》下载免费的PDF全文 |
|
