How can a youthful mountain survive in a foreland setting?–Constraining the uplift threshold rate by numerical simulation  

年轻山地如何能在前陆盆地形成和保存?

作　　者：Haopeng Geng Shun Cai Honghua Lü Baotian Pan 耿豪鹏;蔡顺;吕红华;潘保田(Key Laboratory of Western China’s Environmental Systems(Ministry of Education),College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China;College of Urban and Environmental Sciences,Yancheng Teachers University,Yancheng 224002,China;Key Laboratory of Geographic Information Science of Ministry of Education,School of Geographic Sciences,East China Normal University,Shanghai 200241,China)

机构地区：[1]Key Laboratory of Western China’s Environmental Systems(Ministry of Education),College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China [2]College of Urban and Environmental Sciences,Yancheng Teachers University,Yancheng 224002,China [3]Key Laboratory of Geographic Information Science of Ministry of Education,School of Geographic Sciences,East China Normal University,Shanghai 200241,China

出　　处：《Science Bulletin》2022年第12期1233-1235,M0003,共4页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(41730637,41971001,and 42071005)。

摘　　要：Active orogenic belts provide natural laboratories for investigating the mechanisms of tectonic deformation and landscape evolution.Along their foreland basins,the relatively continuous sedimentary archives and varied geomorphic units have documented the history of the tectonic uplift of the adjacent orogenic belts.Geological records(e.g.,low-temperature thermochronology and sedimentology)can reveal the history of mountain building on a timescale of tens of millions of years.In contrast,geomorphic evidence generally documents the history of much younger landforms.天山北麓逆断裂-背斜构造的生长变形多始于新近纪,但背斜地形可能在晚第四纪才最终显现.这种老构造与年轻地形的不匹配现象在活动造山带的前陆盆地十分普遍.可能的一种解释是:早期的基岩抬升不足以抵消山前河流的扫荡与侵蚀.晚第四纪背斜强烈隆升俨然已突破背斜地形保存的临界抬升速率,但囿于地貌证据与年代学约束的不足,传统方法很难直接获得这一临界速率.本文运用数值模拟、地形比对的方法,约束了背斜地形开始强烈隆升的时间,最终推断天山北麓导致形成背斜地形的临界抬升速率可能介于1~1.6 mm/a.

关 键 词：前陆盆地 背斜构造 晚第四纪 抬升速率 天山北麓 逆断裂 造山带 新近纪 

分 类 号：P542[天文地球—构造地质学]