东昆仑造山带二叠-三叠系遗迹化石及指相意义  

Permian Triassic Trace Fosslls in the Eastern Kunlun Orogenic Belt

作　　者：田军[1] 龚一鸣[1] 梁斌[1] 黄继春 

机构地区：[1]中国地质大学,武汉430074

出　　处：《沉积学报》1999年第3期361-366,共6页Acta Sedimentologica Sinica

基　　金：原地矿部"中国西部不同类型造山带及非史密斯地层区1 :25 万填图方法研究"课题

摘　　要：通过对东昆仑造山带二叠－ 三叠系遗迹化石的研究，识别出了滨海 Ｓｋｏｌｉｔｈｏｓ 遗迹相和深海复理石 Ｎｅｒｅｉｔｅｓ 遗迹相。在造山带地层变形、变质、变位强烈，实体化石稀少，沉积构造受到后期较强烈改造的情况下，遗迹化石的研究对于确定造山带地层的沉积环境、对比地层和研究非史密斯地层构造岩片提供了一种方法。Both the Skolithos ichnofacies and the Nereites ichnofacies have been recognized in the Permian-Triassic of the eastern Kunlun orogenic belt.In the case of the strong deformation,metamorphism and position variation in an orogenic belt,it is difficult to find the body fossils and the physical depositional structures .But the identification of the environment is very important to the study of the structures and the evolution of the orogenic belt, so we must find another efficient way .Through two years of hard works on the trace fossils in eastern Kunlun orogenic belt ,we identified Skolithos ,Palaeophycos , Gordia ,Baugouria , Thalassinoides ,Rhizocorallium and so on in the lower part of Hongshuichuan Formation and merged these trace fossils into Skolithos ichnofacies . In many flgsch slices and limestones slices , we found many deep-sea trace fossils ,such as Palaeodictyon ,Protopalaeodictyon ,Helminthoida and Chondrites, which belongs to Nereites ichnofacies . Since professor Kenneth J.Hsii made inaugyrated work in San Franciscomelange,many geologists have tried to recover the original tempoal sequences,position sequences and lithofacies sequences of the orogenic stratigraphy,But body fossils are rare in the orogenic stratigraphy,tgpical epositional structares wrer rebuilt by tectonic and metamorphosed actirities,losing their initial faces.Though two years field work in eastern orogenic belt,we found that trace fossils can determine the sedimentary environmedt of some orogenic slices the melange,bing significant to the recovering of lithofaties sequences of ovogenic stratigraphy. Furthermore,using trace fossils,we also can contrast stratigraphy in orogenic belt.We fourd an important feature in the lower part of Hong shuichuar Formation that the “skolithos” is very abundant.On the base of field investigation,we ascribe the stratum uhich have abundant “skolithos” and familiar lithology to the lower part of Hong shuichuar Formation. Studies of trace fossils can play a significant role in a sedimentar

关 键 词：造山带 遗迹化石 指相意义 二叠纪 三叠纪 

分 类 号：Q914.646[天文地球—古生物学与地层学] Q914.651[生物学—古生物学]