摘要
贵州三叠纪遗迹化石丰富,有台地相的遗迹化石组合:Thalassnoides、Gyrolithes、Cerato-morph、Chondrites、Rlazocorallium.Rhabdoichnum等;台缘浅滩相的遗迹化石组合:Cylindricum gregarium、Skolithos、Thalassnoides等;斜坡相遗迹化石组合:Protopalaeodictyon、Chondrites、Huaxichnus、phycosiphon、Oldhami-a、Cochiliclaus、Cosmorhaphe、Pinnatpedus、Thalassnoides、Psilonichnus、Arenicolites、Lophoctonlum、Paleophycus等;其中Arenicolites、Thalassnoides、Psilonichnus、Chondrites遗迹化石含量较多,则为上斜坡,如很少含上述四种遗迹化石,而以Lophoctonlum、Protopaleodictyon、Cosmorhaphe、Cochilichnus、Phycosiphon为主,则为下斜坡;盆地相遗迹化石组合:Protopaleodictyon、Helminthopsis、Paleomeandron等。 贵州三叠纪遗迹化石组合与各岩相带分布一致,主要受含氧丰度、水深、水动力条件等诸多因素的控制。由遗迹化石组合分布证明贵州三叠纪岩相古地理格局从黔西北至黔南沉积相带展布为台地相—台缘浅滩相—斜坡相—盆地相。同时建立了贵州三叠纪遗迹相—遗迹化石组合模式。
Trace fossils are rich in Triassic stratigraphy, Guizhou, especially richer in Early and Middle Triassic stratigraphies. After making a systematical study of Triassic trace fossils, the writers have classified them into four trace fossil assemblages.
1. Trace fossil assemblage in carbonate platform
The trace fossils include Thalassnoides, Gyrolithes, Ceratomorph, Chondrites, Rhizacarallitan, Rhabdoich-man, Planolites, Arenicolites and Cavaulichnus.
2. Trace fosil assemblage in carbonate platform margin beach and high-energy reef band The trace fossils include Cylindricum gregarium, Skolithos and Thalassnoides.
3. Trace fossil assemblage in carbonate platform slope
The trace fossils include Protopaleodictyon, Chondrites, Huaxichnus, Phycosiphon, oldhamia, Cochilichnus, Cosmorhaphe, Pinnatpedus,Thalassnoides,Psilonichnus, Arenicolites and Paleophycus, of Which Arenicolites, Thalassnoides, Psilonichnus and Chondrites are more abundant on the upper slope, and Lophoctonlum, Protopaleodictyon, Cosmorhaphe, Cochilichnus and Phycosiphon are rich on the lower slope.
4. Trace fossil assemblage in deep water basin
The trace fossils include Protopaleodictyon, Helminthopsis and Paeeomeandron.
The distribution of the above four trace fossil assemblagese controlled by the factors of deep water and water energy, oxcygen abundance, etc.
The distribution is in accordance with that of the litho-facies zones, that is,from northwestern Guizhou to southern Guizhou, the litho-facies zones respectively belong to carbonate platform facies , carbonate platform margin beach and reef facies-carbonate platform slope facies
-deep water basin facies.
In addition, the trace fossil assemblage distribution and trace facies model of carbonate platform with ridges and slopes are established in the paper.
出处
《贵州地质》
1990年第4期382-386,共5页
Guizhou Geology
