摘要
针对东昆仑及相邻地区研究较薄弱的中生代-新生代早期时段的构造过程提供了系列新的热年代学资料．不同热年代学方法综合揭示了东昆仑及相邻地区在中生代-新生代早期至少存在3次明显的热事件记录．第一次大约启动于200Ma的晚三叠世晚期，并可能一直延续到早中侏罗世之交，是一次具有广泛影响并奠定造山带区域构造格架的构造热事件．区域动力背景可能和南部羌塘地块与昆仑地块的碰撞、松潘-甘孜-巴颜喀拉浊积盆地闭合相关．第二次发生在大约130-150Ma的早白垩世，并可能延续到早白垩世末，主要表现为系列区域性NWW—SEE向的挤压性断裂活动，可对应于白垩纪时期拉萨地块沿班公湖-怒江缝合带与欧亚大陆的增生拼贴事件．第三次为大约56-45Ma的古新世，表现为一期伸展抬升．热年代学记录与零星保存的地质记录具有良好的匹配性，并对构造过程提供了更确切的时间限定．
This paper displays some new thermochronological data on the tectonic processes of the East Kunlun and its adjacent areas in Mesozoic-Early Cenozoic, which were less investigated before. Three thermal events are revealed by different thermochronological methods. The first thermal event, which was a regional tectonic thermal event and established regional tectonic framework, started-up at about 200Ma and lasted to the interim of the early-middle Jurassic. Its dynamics can be related to the closure of the Songpan-Ganzi-Bayan Har Triassic turbilite basin and the collision between the Qiangtang block and the Kumlun block. The second thermal event, mainly shows a series of NWW-SEE regional faults activity, occurred at about 130-150 Ma and lasted to about 100 Ma, the end of Early Cretaceous. The dynamics of this thermal event can be correspond to the collision between the Lhasa block and the Eurasia plate alone the Bangong-Nujiang suture zone. The last one happened at about 56-45 Ma, showing a extension-coursed uplift. The thermochronological records match well to the geological records which fragmentaryrily presented in the study area and provide a more certain constraint to the tectonic processes.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2007年第5期605-614,680,共11页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金项目(Nos40672137
40372104)
中国地质调查局项目"青藏高原新生代地质作用过程与第四纪环境演变综合研究"(No1212010610103)
中国地质调查局项目"青海1:5万库赛湖幅(I46C001002)
中国地质调查局项目不冻泉幅(I46C001003)区域地质调查(No200313000005)"
中国地质调查局项目"青海1:5万阿拉克湖幅(I46C001001)区域地质调查(No19991300004021)"
中国地质调查局项目"青海1:5万冬给错纳湖幅区域地质调查"(NoI46C001002)
