低温热年代学在青藏高原构造地貌发育过程研究中的应用  

Applications of Low Temperature Thermochronology in the Tectonogeomorphology Evolution of the Tibetan Plateau

作　　者：王修喜[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室、资源环境学院,甘肃兰州730000

出　　处：《地球科学进展》2017年第3期234-244,共11页Advances in Earth Science

基　　金：国家自然科学基金项目“低温热年代学重建贵德地区新生代构造地貌发育过程”(编号:41671001)资助~~

摘　　要：构造地貌学被誉为揭开高原隆升历史的钥匙,但一直受困于年代学的制约。低温热年代学的成熟和进步可为构造地貌研究提供精确的年代学支持。综述了最近几年青藏高原隆起过程研究动态,重点讨论高原构造地貌学的发展问题。建议选取构造地貌发育过程中的直接信息载体(地质地貌岩体)以及相关沉积(新生代盆地沉积物、现代河流沉积物、阶地序列),采用多矿物(磷灰石、锆石等)裂变径迹和(U-Th)/He热年代学这些优势互补方法进行综合研究。通过对这些相互区别又相互联系的信号载体进行系统的年代学分析,据此可重建高原各块体的构造地貌发育过程。提出了几种可能的构造地貌发育模式,并指出低温热年代学信号解译中应当注意的问题。The tectonogeomorphology is regarded as the key to understanding the uplift history of the Tibetan Plateau. But its research is blocked by the poor constrains of chronology. The low temperature thermochronology, the most fashions are the zircon and apatite fission-track and （U-Th）/He thermochronology （ZFT, AFT, ZHe and AHe） , has thoroughly developed recently, become a sensitive and precise tool for this kind study, and was suggested in this paper. A metasynthesis study of the multiple low temperature thermochronology was proposed, including the bedrocks of high altitude mountains, on which low-relief and layered landscapes has developed and relicted, as well as the synorogenic deposits, such as the Cenozoic sediments, river terraces and modern river deposits. Thus, mutual compensation of advantages among ZFT, AFT, ZHe and AHe could be achieved to yield a whole exhumation and evolution history of regional tectonogeomorphology during the Cenozic. Accordingly, several conceptual growth models of the tectonogeomorphology terrane can be yielded. However, issues as pointed out in this study are still exist when conducting the relevant researches, and should be carefully addressed.

关 键 词：低温热年代学 构造地貌 发育过程 青藏高原 

分 类 号：P423.3[天文地球—大气科学及气象学]