论海南岛地区志留系  

ON THE SILURIAN STRATA OF THE HAINAN ISLAND AREA,CHINA

作　　者：曾庆銮[1] 李志宏[1] 谢才富[1] 傅太安[1] 张淼[1] 

机构地区：[1]国土资源部宜昌地质矿产研究所,湖北宜昌443003

出　　处：《地层学杂志》2003年第4期267-275,共9页Journal of Stratigraphy

基　　金：海南岛 1/ 2 5万<乐东县幅>(E49C0 0 2 0 0 1);<陵水县幅>(E49C0 0 2 0 0 2 )区域地质调查项目;中国地质调查局地层古生物研究中心资助

摘　　要：海南岛志留系以往被划分为上、中、下三个统。志留系之上是南好组 ,其层位以往被确定为下石炭统岩关阶 ,并认为它与其下的上志留统足赛岭组呈不整合接触。最近在南好组选层型剖面发现早志留世特里奇期晚期(L ate Telychian)的 Xinanospirifer腕足动物群和三叶虫 L atiproetus cf.latilimbatus (Grabau) ,重新论证了以往被确认为中志留统靠亲山组所产的腕足类、三叶虫和珊瑚化石其实都是特里奇期早至中期的分子。现在以无可争辩的事实证明了久归于下石炭统岩关阶南好组 ,以及其下的、以往被确定为上志留统足赛岭组、中志留统靠亲山组等所谓两个构造层的地层都应改归于下志留统 (L landovery Series)。北区下志留统仅有鲁丹期中期至爱隆期早期的黑色碳质页岩相和泥页岩相沉积 ,未发现任何大化石。南区下志留统发育较全 ,为细至中粗粒碎屑岩相夹碳酸盐岩相沉积 ,产丰富介壳相各门类化石 ;当时该区所生存的动物群与扬子区早志留世的关系非常密切 ,并在早志留世末期与扬子区大部分地区一样上升为陆 ,表明海南岛地区在当时属于扬子地台区范畴。The lectostratotype section of the Nanhao Formation (the Upper Member of the Zusailing Formation in this paper) contains extremely abundant fossil brachiopods: Xinanospirifer flabellum Rong, Xu et Yang, X. cf. sanduensis (Jiang), Plectatrypa? sp., Cyrtiidae gen. et sp. indet., and a few trilobites: Latiproetus (Astroproetus) cf. latilimbatus (Grabau) in the Nanhao area, Baoting County, Hainan Province, South China. Among them, Xinanospirifer is characteristic of the Salopinella-Xinanospirifer Assemblage Zone of the Late Telychian of the Late Llandoverian in the Yangtze Region, China. It is gene- rally equivalent to the upper part of the graptolite griestoniensis Biozone to the graptolite spiralis-grandis Biozone; trilobite Latiproetus (Astroproetus) latilimbatus (Grabau) is also a significant element of the Coronocephalus Assemblage Zone of the Upper Member of the Xiushan Formation of the Telychian Stage in the Yangtze Region, China, an indisputable fact indicating that the Nanhao Formation of the lectostratotype belongs to the Late Telychian of the Llandoverian, rather than the Yanguanian of Early Carboniferous in age. It is generally equivalent to the upper parts of the graptolite griestoniensis Biozone to the graptolite spiralis-grandis Biozone.The Kaoqingshan Formation contains exceedingly abundant fossils, chiefly, corals Syringopora cf. qianbeiensis, S . cf. yiwaensis, S . cf. nanshanensis, S. fascioulalis, Heliolites sp., Heliolitella sp., H. longgaoensis, Squameolites densus, Plasmopora sp.; brachiopods Atrypa sp., Striispirifer sp., S . cf. hsiehi, Eospirifer sp., E. sinensis ?, Sowerbyella ? sp., Schizophoria ? sp.; trilobites Coronocephalus sp., C. rex, Encrinuridae gen. et sp. indet., gastropod Hormotoma sp. etc., most of which were commonly assigned to the Middle Silurian (Wenlockian) in age in the past. But new differences reveal that there exist many Early Telychian corals, brachiopods and trilobites, an indisputable fact that the Kaoqingshan Formation belongs to Early Telychian, rather than Middl

关 键 词：海南岛 志留世 生物化石 地层 构造带 

分 类 号：P534.43[天文地球—古生物学与地层学]