| 中国东部燕山期和四川期岩石圈构造滑脱与岩浆起源深度 |
| |
| 引用本文： | 万天丰,王亚妹,刘俊来.中国东部燕山期和四川期岩石圈构造滑脱与岩浆起源深度[J].地学前缘,2008,15(3):1-35. |
| |
| 作者姓名： | 万天丰 王亚妹 刘俊来 |
| |
| 作者单位： | 1. 中国地质大学,地质过程与矿产资源国家重点实验室,北京,100083;中国地质大学(北京)地球科学与资源学院,北京,100083
2. 北京大学,地球与空间科学学院,北京,100871 |
| |
| 摘 要： | 较确切地研究岩石圈内部构造滑脱面在地质历史时期形成的时间和部位是当前大地构造学研究的一个重要课题。通过大量收集中国东部燕山期(205~135Ma)和四川期(135~52Ma)岩浆起源深度资料来判断岩石圈内部和底部是否存在局部的构造滑脱界面,是否发生层圈相互作用,是否发生部分的解耦现象,是一种可行的研究方法。研究表明,中国东部燕山期和四川期岩石圈板块的构造滑脱、圈层的解耦作用及相互作用主要集中在中地壳、莫霍面与区域性主干断层的交线附近,而岩石圈板块的底面却并不存在大幅度的滑移。中国东部燕山期和四川期岩浆活动比较发育的地区基本上都位于大兴安岭—山西西部—武陵山—十万大山一线以东地区,而在此线以西地区岩浆活动相当微弱。笔者认为,在侏罗—白垩纪时期,该线以西缺少岩浆活动的地区可能就是当时的大陆型岩石圈,而该线以东岩浆活动剧烈的地区可能就属于海陆过渡型岩石圈。中国东部岩石圈的转型和"变薄",不太可能是深部地幔羽、去根作用、深部地幔热物质上涌或大陆伸展作用的结果,也不太可能与太平洋板块的俯冲作用有直接联系。
|
| 关 键 词： | 岩石圈 构造滑脱 岩浆起源深度 局部解耦 过渡性岩石圈 |
| 文章编号： | 1005-2321(2008)03-0001-35 |
| 修稿时间： | 2008年2月20日 |
Detachments and magmatic source depth in lithosphere of Eastern China during Yanshanian and Sichuanian stages |
| |
| Wan Tianfeng,Wang Yamei,Liu Junlai.Detachments and magmatic source depth in lithosphere of Eastern China during Yanshanian and Sichuanian stages[J].Earth Science Frontiers,2008,15(3):1-35. |
| |
| Authors: | Wan Tianfeng Wang Yamei Liu Junlai |
| |
| Abstract: | It is an important project for present tectonics to precisely research the time and space of the detachment formation in the lithosphere in geological history.It is a feasible research method that through collecting a lot of data of magmatic source depths in Eastern China during the Yanshanian (205-135 Ma) and Sichuanian (135-52 Ma) tectonic stages to determine the local tectonic detachment, the partial decoupling and the interaction between spheres in the lithosphere or at the bottom of the lithosphere.The results showed that the tectonic detachment, the partial decoupling and the interaction between spheres were exhibited and concentrated at the intersection of the middle crust, the Moho and the regional main faults of Eastern China during Yanshanian and Sichuanian tectonic stages, however, at the bottom of the lithosphere does not exist obvious detachment or migration in those stages.The violent magmatic area of Eastern China during the Jurassic and Cretaceous mainly distributed to the east boundary of Da Hinggan Ling-western Shanxi-Wulingshan-Shiwandashan, and to the west of this boundary the magmatism was very weak.The authors propose that there was the continental type of lithosphere to the west of that boundary, and the oceanic-continental transition type of lithosphere (continental crust with oceanic lithospheric mantle) to the east of that boundary.The lithosphere transformation and thinning of Eastern China in the Jurassic probably resulted neither from the mantle plume, un-rooting, upsurge of heat mantle materials and continental rifting, nor directly from the subduction of the Pacific plate. |
| |
| Keywords: | lithosphere detachment magmatic source depth partial decoupling transition type of lithosphere |
| 本文献已被 维普 万方数据 等数据库收录！ |
|
