ADVANCES IN LOWER AND MIDDLE TRIASSIC STRATIGRAPHIC RESEARCH IN EAST OF EASTERN KUNLUN OROGENIC BELT
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摘要: 东昆仑造山带东段下中三叠统包括下三叠统洪水川群和中三叠统闹仓坚沟组.根据实体化石和遗迹化石的研究, 结合区域上的岩性对比, 将洪水川群划分为3个岩性单元, 即底部砂砾岩段、中部灰岩夹砂岩段和上部砂板岩段, 属于下三叠统印度阶和奥伦尼克阶.闹仓坚沟组包括闹一段砂砾岩和闹二段砂板岩, 从中三叠统早安尼锡期延续到中安尼锡期.砂岩的常量元素分析结果表明, 大部分砂岩为杂砂岩, 属于复理石盆地的浊积岩范畴; 砂岩稀土元素的特征值接近于活动大陆边缘和大陆岛弧元素的参数值.Abstract: The Lower and Middle Triassic strata, east of Eastern Kunlun orogenic belt, contains the Lower Triassic Hongshuichuan Group and the Middle Triassic Naocangjiangou Formation. The studies of body and trace fossils, as well as those of the regional lithology correlation, show that the Lower Triassic Hongshuichuan Group included in the Lower Triassic Indian stage and Olenekian stage, are divided into three lithological units: the sandstone and conglomerate unit at the bottom, the limestone with sandstone unit in the middle, and the sandstone and slate unit at the top. The Naocangjiangou Formation ranging from the early Middle Traissic to Middle Anisian includes two members: the sandstone and conglomerate member at the bottom and the sandstone and slate member at the top. The analysis of constant elements in the sandstone indicates that the majority of sandstones are composed of greywacke, belonging to the turbidite in a flysch basin. The eigenvalues of the rare-earth elements in the sandstone are close to the parameters of the rare-earth elements located in the active continental margin and in the continental arc.
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图 1 东昆仑造山带南北向构造模式剖面
1.三叠系巴颜喀拉群; 2.二叠系—三叠系布青山群; 3.上二叠统格曲组砂砾岩段推覆体; 4.上二叠统格曲组灰岩段推覆体; 5.上二叠统格曲组—下三叠统东昆南前陆盆地沉积; 6.中下二叠统树维门科组推覆体; 7.印支期闪长岩; 8.加里东期花岗闪长岩; 9.前印支期活动基底; 10.前寒武纪变质基底; 11.巴颜喀拉浊积盆地基底; 12.逆冲断层
Fig. 1. Northsouth tectonic model section of the Eastern Kunlun orogenic belt
图 2 下中三叠统砂岩的lg[w (SiO2)/w (Al2O3) ]与lg[ w (Na2O)/w (K2O) ]关系
Fig. 2. Projective plot of lg[w (SiO2)/w (Al2O3) ]-lg[ w (Na2O)/w (K2O) ] of Lower and Middle Triassic sandstones
表 1 东昆仑造山带东段下中三叠统地层序列
Table 1. Lower and Middle Triassic stratigraphic sequence of the Eastern Kunlun orogenic blet
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