TECTONIC ENVIRONMENT OF NAIJ TAL GROUP IN THE EAST KUNLUN OROGENIC BELT
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摘要: 纳赤台群是东昆仑造山带重要的岩石地层单位，对恢复早古生代地质演化历史具有重要意义，但对其形成构造环境分歧较大。在野外详细地质填图的基础上，对东昆仑造山带奥陶—志留系纳赤台群碎屑岩进行地球化学分析，以探讨东昆仑早古生代构造环境，为东昆仑早古生代构造演化研究提供地球化学证据。研究结果表明，纳赤台群形成于被动大陆边缘，而非活动大陆边缘的弧前盆地沉积，该结果与前人根据地质分析得出的结论一致。Abstract: The Naij Tal Group, an important stratigraphic unit, is of great significance to reconstruction of the geological evolution of the East Kunlun orogenic belt during the Early Paleozoic, but divergent opinions have been proposed about its tectonic environment. Based on close geological survey, a geochemical analysis has been made on the clastic rocks in the OrdovicianSilurian Naij Tal Group in East Kunlun orogenic belt, and the results demonstrate that this group was formed in passive continental margin, rather than in fore-arc basin on active continental margin. The study provides geochemical evidence for the study of early Paleozoic tectonic evolution in east Kunlun orogenic belt.
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Key words:
- lithogeochemistry /
- tectonic setting /
- Naij Tal Group /
- East Kunlun orogenic belt
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图 1 格尔木南地质构造简图及采样点位置
1-中三叠统闹仓坚沟组; 2-下三叠统洪水川组; 3-上石炭统浩特洛洼组; 4-志留—泥盆系牦牛山组; 5-奥陶—志留系纳赤台群哈拉巴依沟组; 6-奥陶—志留系纳赤台群石灰厂组碳酸盐岩段; 7-奥陶—志留系纳赤台群石灰厂组火山岩段; 8-奥陶—志留系纳赤台群水泥厂组; 9-新元古界万宝沟群碳酸盐岩组; 10-志留纪花岗闪长斑岩; 11-逆断层; 12-采样点位置
Figure 1. A map showing geology to south of Golmud and sample locations
图 3 水泥厂纳赤台群砂岩构造环境微量元素判别图(图廓据文献[14])
A-大洋岛弧; B-大陆岛弧; C-主动大陆边缘; D-被动大陆边缘
Figure 3. Discrimination for tectonic setting of Naij Tal Group based on trace element composition of sandstones at a cement factory in East Kunlun Mountains
表 1 纳赤台群砂岩氧化物含量分析结果
Table 1. The oxides contents in the sandstones of the Naij Tal Group
表 2 判别函数值
Table 2. The values of discriminated function for the sandstones in Naij Tal Group
表 3 纳赤台群砂岩微量元素含量分析结果
Table 3. Contents of trace element of sandstones in Naij Tal Group
表 4 纳赤台群砂岩微量元素与构造性质的关系[16]
Table 4. The relationship between the trace element contents and ratios for sandstone and tectonics
表 5 纳赤台群砂岩稀土元素含量及特征参数
Table 5. REE contents and major parameters of the sandstones in Naij Tal Group
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