中国遗迹学研究十年进展

近十年来,中国遗迹学的研究取得许多新进展和新认识,重要成果概述如下:(1)在显生宙海相和过渡相沉积中新识别出84个遗迹属和211个遗迹种,新建28种遗迹组合及26种遗迹组构;在中生代和新生代陆相冲积扇、河流与湖泊沉积中识别出44个遗迹属和107个遗迹种,新建22种遗迹组合及10种遗迹组构;(2)论述了寒武纪底质革命对早...

Research progress of Chinese ichnology in recent ten years

Many new advances and understandings have been made in the study of Chinese ichnology in recent ten years,and key results are outlined below: (1)84 ichnogenera and 211 ichnospecies have been identified and 28 types of ichnoassemblages and 26 types of ichnofabrics have been established in the Phanerozoic marine and transitional deposits;44 ichnogenera and 107 ichnospecies have been identified and 22 types of ichnoassemblages and 10 kinds of ichnofabrics have been established in the Mesozoic and Cenozoic terrestrial(alluvial fan,fluvial and lacustrine)deposits;(2)The impact of the Cambrian Substrate Revolution on the evolution of early benthic organisms and ecological effects was discussed;(3)The response relationship of 3 kinds of palaeo-oxygenation(aerobic,dysaerobic and anaerobic)facies to ichnofossils and their deposition backgrounds was proposed;(4)Many carbonate micro-shapes(single mineral and aggregates)related to microbes were found in limestones of the Lower Permian Taiyuan Formation of the northern China,and six kinds of carbonate micro-shapes were distinguished by observing Zoophycos burrow fillings,which are spheroid-like,rhabditiform,areatus,net-like,vase-like and cerebrum-like. Meanwhile,it was described that many complex and delicate biogenetic structures formed by a series of life activities of trace-makers with symbiotic micro-organisms;(5)The sedimentary setting evolution of a complex ichnofossil Zoophycos was revealed,i.e.,the bathymetrical shift of Zoophycos from the littoral-neritic to bathyal-abyssal environments synchronized with the tiering shift from shallow to deep;(6)It was suggested that the composition and distribution characteristics of ichnofossils in a sedimentary sequence of storm and turbidity currents in the littoral-neritic and lacustrine environments and nearby P-Tr boundary,and the ecological system evolution law of ichnofossils and their trac-makers before and after the P-Tr event was demonstrated,which provides a reliable ichnologic information for the ecosystem recovery process after the P/Tr great extinction;(7)A large amount of theropod,sauropod and ornithopod dinosaur tracks were found in the Jurassic and Cretaceous of many places in the eastern,northern and western China;(8)Many types of microbially induced sedimentary structures were distinguished in the clastic deposits of the Mesoproterozoic and Upper Permian-Lower Triassic in the North China Platform;(9)The bioturbation and ichnofabrics in clastic and carbonate rock reservoirs and their impact on reservoir physical properties were analyzed in detail,a three-dimensional geological model of bioturbation changes was established,and the manifestation and research methods of bioturbation type reservoirs were put forward. These results have greatly promoted the development and progress of ichnological field including ichnotaxon,ichnofacies,ichnofabrics,geomicrobiology and application in the event deposits and reservoir geology in China.