摘要
通过多年野外观察、分析测试,结合覆盖全区的1∶250000区域地质调查资料及其他前人研究成果,选择昆仑造山带晚古生代洋盆发育的典型时期石炭纪,对其地层、岩相特征、构造古地理以及构造演化进行了研究。研究表明:昆仑造山带石炭纪总体处于伸展裂陷的大地构造背景,昆北为活动边缘裂谷,大部分区域为滨浅海相沉积,局部为半深海及火山盆地相沉积;昆中大部分地区为洋岛或水下隆起,洋岛主要为剥蚀区,水下隆起部分主要为滨浅海相沉积,局部地区为碳酸盐岩台地;康西瓦—木孜塔格—阿尼玛卿一线为有限洋盆(昆南洋),昆南大部及昆中部分地区为深海—半深海相沉积,昆南部分地区为滨浅海相沉积;总体表现为两堑夹一垒、洋岛遍布、南深北浅的多岛小洋盆的构造古地理格局。
Through analyzing previous data, 1 ： 250 000 regional geologic survey, this paper studies the carboniferous lithofacies character and tectono-paleogeography. The results indicate that： in Carboniferous period, Kunlun orogenic belt was in an extension setting, and the north Kunlun was an active margin rift with littoral-neritic sediments of sail-blue water and. volcanic basin; the Central Kunlun was an ocean island and underwater uplift, the oceanic islands were denudation areas, whereas the underwater uplifts were mainly littoralneritic sediments with the scattering outcrops of carbonate platform sediments; Kangxiwa-Muztagh-Animaqing small ocean basin and the South Kunlun ocean had blue-water to half-blue water sediments and littoral-neritic sediments in some areas; In general, the Kunlun orogenic belt displayed a graben-horst structure with rich ocean islands and being deeper in South than North in Carboniferous period.
出处
《地球科学与环境学报》
CAS
2008年第3期221-233,共13页
Journal of Earth Sciences and Environment
基金
中国地质调查局重点项目(1212010310101
1212010610102)
关键词
昆仑造山带
石炭纪
岩相特征
构造古地理
多岛洋盆
构造演化
Kunlun orogenic belt
Carboniferous period
lithofacies character
tectono-paleogeography
multi- island ocean basin
tectonic evolution
