滨岸—浅海混合沉积对海平面与气候变化的响应——以塔里木盆地巴麦地区石炭系为例
发布时间：2019-06-04 14:59
【摘要】：陆源碎屑—碳酸盐混积作用发生的环境特征尚不明确,导致对混积岩分布规律认识不足。以塔里木盆地巴麦地区石炭系为例,通过薄片观察、矿物组成分析、主微量元素分析,对沉积环境和古环境特征参数进行了研究。研究区混积岩发育在障壁滨岸、碳酸盐岩局限台地和开阔台地。利用与混积强度相关性极好的Ti、Rb、K和Al的含量,将混积岩定量划分为4级。利用Na/Ca比值、Na含量分析了古盐度特征,Mn/Fe比值和Sr含量分析了古水深,用V/(V+Ni)比值反映了氧化还原条件,并利用Ti/Al,Mg/Sr反映了古气候特征。研究结果表明II级以上混积均发生在湿润气候下,而干旱气候无明显混积,并且混合沉积大部分发生在海平面下降阶段。碳酸盐岩开阔台地的混积强度仅达I级,障壁滨岸和碳酸盐岩局限台地的混积强度较高,发育III级和IV级高度混积岩。不同沉积环境的混合沉积均对古气候变化与相对海平面变化具有良好的响应,是详细的古环境变化记录。
[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.
【作者单位】： 成都理工大学能源学院;油气藏地质及开发工程国家重点实验室(成都理工大学);杜伦大学地球科学系;
【基金】：国家自然科学基金项目(41402096)~~
【分类号】：P731.23;P736.21
[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.
【作者单位】： 成都理工大学能源学院;油气藏地质及开发工程国家重点实验室(成都理工大学);杜伦大学地球科学系;
【基金】：国家自然科学基金项目(41402096)~~
【分类号】：P731.23;P736.21
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