摘要
准噶尔盆地西北缘石炭纪地层主要由碎屑岩组成,沉积厚度5000—7000m,在下石炭统和中石炭统中首次发现了包括浊流在内的重力流沉积和平流岩,大量的深水相遗迹化石。说明盆地西北缘是深水沉积,而非前人普遍认为的属浅水沉积环境。
In the northwest maginal area of Zhunga'er Basin, the Carboniferous strata are mainly composed of clastic rocks. These rocks were previously thought as shallow sea sediments. The authors studied stresslly on the lower and middle Carboniferous and considered that these rocks belong to turbidite. In addition, the gravity flow and contourite sediments also existed It is the first time to discovere plenty trace fossils in these turbidites. the trace fossils existed in sand-mudstone of upper Lower-Carboniferous are: Zoophycos sp., Chondrites sp., Planolites sp, and Scalarituba sp.. The trace fossils existed in mudstone of Middle Carboniferous are: Scalarituba sp., Cosmorhaphe sp., Helminthopsis sp., Helminthoida sp., Scalarituba sp., Para-scalaritubus sp., Zoophycos sp., and Neonerenes sp. All these fossils can be classified into Eodinichnia traces. By comparison of the khnofacies with Scilachers studies (1967), (?) ichnofacies mentioned above existed in semi-pelagic to deep-sea environments. According to above analysis, we think that the sedimentary environment of the Northwest margin of the basin in Carboniferous period belong to deep-sea area other than shallow sea area.
出处
《地质科学》
CAS
CSCD
北大核心
1989年第1期9-15,共7页
Chinese Journal of Geology(Scientia Geologica Sinica)
关键词
石炭纪
浊积岩
遗迹化石
沉积相
carboniferous, turbidite, trace fossil, deep-water sedimentary environment
