中下扬子区二叠系露头层序地层研究

按新近国际年代地层划分方案（ICS，2000），下扬子区二叠纪地层自下向上分为3统，9阶和相对应的华南传统6阶划分。二叠系从阿瑟尔阶至长兴阶（44Ma)共划分出14个三级层序，每个三级层序平均时限约为3.14Ma，其中“紫松阶”）相当阿瑟尔＋2／3萨克马尔阶）1个（船山组中上部）、“隆林阶、（相当1／3萨克马尔阶＋阿丁斯克阶）2个（分别对应船山组上部和梁山组或镇江组）、“栖霞阶”（相当库班甘德阶＋1／3罗德阶）3个（栖霞组），“茅口阶”（相当于2／3罗德阶＋沃德阶＋卡皮丹阶）4个（孤峰组，茅口组，堰桥组，银屏组和武穴组），吴家坪阶2个（龙潭组或吴家坪组），长兴阶2个（长兴组或大隆组）；共归并为4个层序组（sequence set)。

Research on Outcrop Sequence Stratigraphy of Permian in the Middle-Lower Yangtze Region

According to the latest International Chronostratigraphic Scheme (ICS, 2000), the Permian in the middle lower Yangtze region of South China traditionally can be divided into three series and nine stages or relevant to six stages. From Assellian to Changxingian of Permian, 44 Ma in age range, the strata are composed of 14 third order sequences, 3.14 Ma in average age range of each third sequence . There is one third order sequence in Zisongian, equivalent to middle and upper Chuanshan Formation or equal to Assellian and two thirds of Sakmarian. There are two third order sequences, corresponding to Liangshan Formation or Zhenjiang Formation. And upper Chuanshan Formation, which are assigned to Longlingian, coinciding with Artinskian and one third of Sakmarian. In addition, three of them, equal to Qixia Formation, are attributed to Qixian, corresponding to Kubergandian and one third of Roadian. Five of them, comprising Kuhfeng Formation, Maokou Formation, Yanqiao Formation, Yinping Formation and Wuxue Formation, are assigned to Maokouan, equivalent to two thirds of Roadian, Wordian and Capitanian. Two of them, equal to Lungtan Formation or Wujiaping Formation, are included in Wujiapingian. Other two of them, corresponding to Changxing Formation or Talung Formation, are assigned to Changxingian. In brief, these above third order sequences can be incorporated into 4 sequence sets.