摘要
东昆仑中段是昆仑山地区基础研究的热点,区内地质构造复杂、地层类型多样。对构造混杂岩地层必须坚持活动论思想,采取以反序方法,有助于正确进行构造古地理的恢复。对成层有序的浅变质砂岩、板岩必须摒弃传统做法,即按一个岩系的自然成因单元结构进行。通过对东昆仑中段构造构混杂岩的万保沟岩群研究,获得了洋岛地层序列的新认识,识别了东昆仑中三叠世希里可特组的存在。对巴颜喀拉山群作了许多新研究,对中新世地层取得了重大发现,提出了青藏高原隆升的具体时间和一系列特点。
The middle Eastern Kunlun is a popular area with a great attraction in basic geologic researches of the Kunlun orogenic belt. In view of complicated geological structures and various stratigraphic types of the area, in the study on tectonic melanges the idea of activation of tectonic movements and reversed order method should be adopted, being helpful to correct palaeotectonic and palaeogeographic reconstructions. Particularly, in the study of stratified ordered epimetamorphic sandstones and slates from the orogenic belt, the stratigraphic division according to structures of natural genetic units of a rock series must be used, whereas the stratigraphic division according to the traditional simple method of sand/mud ratios should be dismissed. By the reserach on the Wanbaogou Group tectonic melanges of the middle Eastern Kunlun, a new understanding of oceanic island stratigraphic sequence has been obtained, and existence of the Middle Triassic turbidite fan graywackes has been recognized. Basing on lots of new researches on the Bayankala mountains, a major discovery of Miocene strata has been gained, and the specific time and characteristics of uplifting of the Qinghai-Tibet Plateau have been proposed.
出处
《资源调查与环境》
2009年第4期243-254,共12页
Resources Survey & Environment
基金
中国地质调查局1:25万小冻泉幅
库塞湖幅调查项目(200313000005)资助
关键词
造山带构造混杂岩
成层有序地层
青藏高原隆升
东昆仑中段
tectonic melanges of orogenic best
stratified ordered layer
uplifting of the Qinghai-Tibet Plateau
middle Eastern Kunlun
