南盘江盆地中三叠统复理石韵律的马尔科夫链特征及其地质意义  

Markov Chain Simulation on the Rhythmic Sequences of Middle Triassic Flysch in Nanpanjing Basin,SW China

作　　者：张成凤[1] 吕洪波[1] 夏邦栋[2] 方中[2] 

机构地区：[1]中国石油大学地球科学系,山东青岛266555 [2]南京大学地球科学系,南京210093

出　　处：《地质论评》2011年第5期632-640,共9页Geological Review

摘　　要：本文利用南盘江盆地中三叠统复理石韵律的野外测量数据,从马尔柯夫链原理出发,对其进行了频数转移矩阵、概率转移矩阵、极限概率矩阵和环流矩阵等沉积旋回最优分解综合分析。分析过程中发现并命名了循环链和二级循环链,并对循环链进行了特殊处理。通过分析模拟获得的状态循环模式图,建立了不同地点实测段的代表性韵律结构模式并绘制了韵律结构剖面示意图。最后结合野外观测的沉积构造等相标志分析对比了不同地点的韵律结构和沉积环境的关系,确认了边阳、兰木等地典型的滨岸潮汐带环境和田林利周与丰厚等地以浊流为主的强事件沉积特征,认为南盘江盆地在中三叠世符合残余盆地这一大地构造背景。The authors of this paper processed the rhythmic sequence data of the Middle Triassic Flysch attained in the field in the Nanpanjiang Basin,southwest of China.The Markov chain simulation method is mainly used to create transition probability matrices,limit probability matrices and circulation matrices.The authors found and named the cyclic chain and the secondary cyclic chain and gave a solution for these cyclic chains.Based on the simulation,20 cycle models with sketch profile diagrams of rock type units for the flysch rhythmic sequences are given,being correlated respectively to the outcrop sections of flysch strata measured in the Nanpanjiang area.The authors analyzed the relationship between the rhythmic models derived from the simulation and the sedimentary environments in different locations of the Nanpanjiang Basin during the Middle Triassic.The rhythmic models show that north parts（e.g.Bianyang and Lanmu） of the basin belonged to littoral areas with tidal facies while the southern parts（such as Tianlin and Xilin） were the basin axis with strong event deposits of turbidities.All the facies distribution model shows that Nanpanjiang Basin was a remnant basin during the Middle Triassic.

关 键 词：南盘江盆地 中三叠统 复理石韵律 马尔科夫链模拟 二级循环链 沉积环境 

分 类 号：P512.2[天文地球—地质学]