摘要
首次对青海南部曲麻莱-治多地区巴颜喀拉山群上部(上三叠统)遗迹化石进行了系统采集,共采获遗迹化石33属54种。据遗迹化石的形态、习性、水深等环境成因特征,可划分为两类组合:一类以Cosmorhaphe,Helminthopsis,Helminthoida,Megagrapton,Paleodictyon等为主,产生于浊流事件前;另一类以Chondrites,Neo-nereites,Palaeophycus,Phycosiphon,Planolites,Zoophycos等为主,产生于浊流事件后,两者均为半深海-深海Nereites遗迹相的典型代表,反映晚三叠世研究区应为浊流沉积发育的复理石相沉积。
Trace fossils from the upper pant of the Bayanharshan Group （Upper Triassic） in Qumarleb-Zhidoi area, Southern Qinghai Province, have been systematically gathered for the first time, they comprise 54 ichnospecies in 33 ichnogenera. The main ichnogenera include Arthrophycus, Asterichnus, Chondrites, Circulichnis, Cosrnorhaphe, Didyrnaulichnus, Helminthoida, Helminthopsis, Megagrapton, Neonereites, Nereites, Palaeophycus, Palaeodictyon, Pelecypodichnus, Phycodes, Phycosiphon, Planolites, Xiangquanheichnus, Zoophycos and so on. According to the morphology,ethnology and water depth, the studied trace fossils include two ichno-assemblages, one formed before turbidity flows, such as Cosmorhaphe, Helminthopsis, Helminthoida, Megagrapton, Palaeodictyon etc. , and the other emplaced after the turbidity event, such as Chondrites, Neonereites, Palaeophycus, Phycosiphon, Planolites,Zoophycos, etc. Both of these assemblages are typical representatives of the bathyal-abyssal Nereites ichnofacies, which therefore would indicate that the Late Triassic pant of the Bayanharshan Group of the studied area was formed in a flysch facies with abundant turbidity currents.
出处
《古生物学报》
CAS
CSCD
北大核心
2007年第1期122-134,共13页
Acta Palaeontologica Sinica
基金
中国地质调查局基础地质调查项目(No.200313000006)
国家自然科学基金项目(No.40372004)资助
