| 内蒙占珠斯楞海尔罕地区中、晚泥盆世地层及四射珊瑚群的古地理意义 |
| |
| 引用本文： | 王训练
,王鸿祯.内蒙占珠斯楞海尔罕地区中、晚泥盆世地层及四射珊瑚群的古地理意义[J].现代地质,1987(Z1). |
| |
| 作者姓名： | 王训练 王鸿祯 |
| |
| 摘 要： | 前人(张研等,1983)曾将珠斯愣海尔罕地区的泥岔系分为4个组:珠斯楞组、依克乌苏组、卧驼山组和西屏山组,分别属于埃姆斯期、艾菲尔期、吉维特期和弗拉斯期。本文描述了该区中、上泥盆统4个剖面,将其划分为4个沉积旋网,每个旋回构成一组,自下而上依次为依克乌苏组、卧驼山组、下西屏山组和上西屏山组。根据四射珊瑚组合和其它共生化石,把依克乌苏组上部到下西屏山组下部归入吉维持期,下西屏山组上部相上西屏山组的时代为弗拉斯期,木区缺乏法门期的沉积。 关于珠斯楞海尔罕地区所在的北方槽区泥盆纪的生物地理区系特征尚无统一认识。作者根据四射珊瑚动物群的地方性分子含量,Otsuka相似性系数和构造古地理,将中同泥岔纪的珊瑚分为3个大区:北方大区、北特提斯大区和南特提斯大区。这种划分方案也非常适用于吉维特期和弗拉斯期。 吉维持期到弗拉斯期,巴丹吉林区和扬子区珊瑚群的关系最为密切,与北天山——准噶尔区和内蒙古——兴安区共同的属很少。因此,广大的北方槽区属于两个不同的生物大区,北方大区和北特提斯大区,二者的界线是居延海——林西地壳对接带。这种认识与王鸿祯(1981)所划分的中国大地构造单元一致。
|
THE MIDDLE AND LATE DEVONIAN STRATA AND THE RUGOSE CORAL PALAEOBIOGEOGRAPHICAL SIGNIFICANCE OF ZHUSILENG HAIERHAN AREA,NEIMONGOL |
| |
| Abstract: | The Devonian System of Zhusileng Haierhan area, Ejina Qi, Neimongol was divided into four formations by Zhang et al (1983) , Zhusileng Formation, Yikewusu Formation, Wotuoshan Formation and Xipingshan Formation, belonging to Emsian, Eifelian, Givetian and Frasnian respectively. In thispaper four Middle and Upper Devonian sections are studied, and are divided into four sedimentation cycles, each making up one formation. They are from below upwards, Yikewusu Formation, Wotuoshan Formation, Lower Xiping-shan Formation and Upper Xipingshan Formation. On the basis of rugose coral assemblages and other associated fossils, the upper part of Yikewusu Formation and the lower part of Lower Xipingshan Formation are considered to be Givetian, while the upper part of Lower Xipingshan Formation and Upper Xipingshan Formation to be Frasnian in age. Famenian is absent in the area.
There is no agreement among palaeontologists on the Devonian biogeographi-cal provincialization in the geosynclinal region of northern China, which includes Zhusileng Haierhan area. Hou et al. (1979) proposed that in the Devonian Period the geosynclinal region of northern China was an independent biogeogra-phical realm, and had no direct relation to the Old world Realm and Appalachian Realm. C. Y. Wang (1983) considered that the geosynclinal region is only a province of the Old World Realm. H. C. Wang et al. (1983) and Z. P. Wang(l935) recognized three biogeographical realms of Devonian rugose corals within China, Boreal Realm, Tethyan Realm and Australo?Pacific Realm, the Tianshan, Neimongol Province which includes Zhusileng Haierhan belonging to Tethyan Realm. On the basis of endemism percentage and Otsuka similarity coefficients of rugose coral faunas and of tec tono - palae-ogeography, three biogeographical realms, Boreal, North Tethyan and South Tethyan, may be recognized within China in the Devonian. This applies very well in Givetian to Frasnian. The Boreal Realm includes North Tianshan -Junggar Province and Neimongol - Hingan Province, while North Tethyan Realm includes the Yangtze Province, South Tianshan Province and Badain Jaran Province, the latter represented by Zhusileng Haierhan area.The South Tethyan Rea^n includes only Baoshan-Shidian Province within China.
In Givetian and Frasnian the Badain Jaran Province appears to bear a closest relation with the Yangtze Province, and has only a few common genera with North Tianshan - Junggar Province and Neimongol-Hingan Province. Thus the extensive geosynclinal region of northern China belonged to two different biogeographical realms, Boreal and North Tethyan, the boundary being the Juyanhai - Linxi crustal consumption zone which represents the consummed open sea. This is consistent with the geotectonic subdivision of China as proposed by H. C.Wang(l981). |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
|
