Developed models of palaeogeographical environments based on Mid- Proterozoic sedimentary facies indicators of the Changcheng System (Great Wall System) of the Ming Tombs District，Beijing
Song Tianrui
Institute of Geology，Chinese Academy of Geological sciences Beijing 10037
Abstract This briefly introduces Palaeogeogaphical models and their facies indicators of Proterozoic Strata of the Ming Tombs District， Bejing， as well as some related sedimentary problems ， such as the isotopic geo-age of the Mid-Proterozoic Changzhougou Formation Archean Fuping Group by single zircon and SHRIMP method， the Chuanglinggou and Gaoyuzhuang Formations by Pb-Pb method; the world oldest iron cosmic spherules， the origin of double crested wave ripples on dolomite bed surface as a result of intraclastic grains; herringbone cross stratification in silicified dolomite composed by silicified pellets; the algal filaments and event message-bearing rocks in the Dahongyu Formation; volcanic activities and earthquake water escape in the Chuanglinggou Formation; the discovery of dubiofossils in the Changzhougou and Gaoyuzhuang Formations; the discovery of authigenic monazite and regrowth zenotime in Changzhougou and Chuanglinggou Formations as well as the solar nebula material carbonaceous chondrite discovered for the first time from the Dahongyu Formation.
. Developed models of palaeogeographical environments based on Mid- Proterozoic sedimentary facies indicators of the Changcheng System (Great Wall System) of the Ming Tombs District，Beijing[J]. JOPC, 2007, 9(5): 461-472.
