濱岸—淺海混合沉積對海平面與氣候變化的響應——以塔里木盆地巴麥地區(qū)石炭系為例
[Abstract]:The environmental characteristics of terrestrial clastic carbonate mixing are not clear, which leads to insufficient understanding of the distribution law of mixed rocks. Taking the carbonitic system in Bamai area of Tarim Basin as an example, the characteristic parameters of sedimentary environment and paleoenvironment were studied by means of thin slice observation, mineral composition analysis and main trace element analysis. The mixed rocks in the study area are developed on the barrier bank, and the carbonate rocks are confined to the platform and the open platform. The mixed rocks are divided into 4 grades quantitatively by using the contents of Ti,Rb,K and Al, which are well correlated with the mixing strength. The paleosalinity characteristics, Mn/Fe ratio and Sr content were analyzed by using Na/Ca ratio and Na content. The redox conditions were reflected by V / (V Ni) ratio, and the paleoclimate characteristics were reflected by Ti/Al,Mg/Sr. The results show that the mixing above II grade occurs in humid climate, but there is no obvious mixing in arid climate, and most of the mixed deposition occurs in the stage of sea level decline. The mixing strength of carbonate open platform is only grade I, and the mixing strength of barrier shore and carbonate limited platform is high, and III and IV grade highly mixed rocks are developed. The mixed deposition in different sedimentary environments has a good response to paleoclimate change and relative sea level change, and is a detailed record of paleoenvironmental change.
【作者單位】: 成都理工大學能源學院;油氣藏地質及開發(fā)工程國家重點實驗室(成都理工大學);杜倫大學地球科學系;
【基金】:國家自然科學基金項目(41402096)~~
【分類號】:P731.23;P736.21
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