阿尔金红柳沟—拉配泉混杂岩带中—新生代隆升-剥露的裂变径迹证据  

Fission track evidence of Mesozoic-Cenozoic uplifting-denudating in Hongliugou-Lapeiquan melange belt,the north margin of Altyn Orogen

作　　者：郭怀军 王虎[1] 贾伟航 全守村[1] GUO Huaijun;WANG Hu;JIA Weihang;QUAN Shoucun(Xi′an Center of China Geological Survey, Xi′an 710054, China;Gansu Coal Geology Survey Institute, Lanzhou 743099, China)

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710054 [2]甘肃煤炭地质勘查院,甘肃兰州743099

出　　处：《西北大学学报（自然科学版）》2022年第4期710-724,共15页Journal of Northwest University（Natural Science Edition）

基　　金：中国地质调查局项目(DD20160005,DD20211398)。

摘　　要：以阿尔金红柳沟—拉配泉混杂岩带中段阿克达坂至喀腊大湾一带的各类岩石为研究对象,通过锆石、磷灰石裂变径迹测年和热史模拟揭示阿尔金红柳沟—拉配泉混杂岩带中生代以来的隆升演化史。分析结果表明,阿尔金红柳沟—拉配泉混杂岩带中生代以来至少经历了5次构造隆升事件:222~186 Ma(晚三叠世到早侏罗世)、144~13 Ma(早白垩世早期)、103~82 Ma(早白垩世晚期到晚白垩世)、45~27 Ma(始新世到渐新世)和22~7 Ma(中新世)。热史模拟结果显示,阿尔金北缘新生代以来隆升具有一定的整体性和区域差异性:新生代初期,阿尔金北缘整体隆升较为缓慢;始新世到渐新世,具有西快东慢的隆升特点;中新世以来,阿尔金山地区发生了一次剧烈的区域隆升事件,该隆升事件在阿尔金红柳沟—拉配泉混杂岩带呈现出起始时间东早西晚的趋势。To take the rock from Akdaban to Kalada Bay,middle of the Hongliugou-Lapeiquan melange belt,at north margin of Altyn as the research object,to investigate the uplift evolution history of the EW mountain since Mesozoic,through zircon and apatite fission track low-temperature thermochronology and thermal history models.The results show that the Hongliugou-Lapeiquan melange belt at the north margin of Altyn experienced at least five tectonic uplift events since Mesozoic:222~186 Ma(late Triassic to early Jurassic),144~130 Ma(early stage of early Cretaceous),103~82 Ma(late stage of early Cretaceous to late Cretaceous),45~27 Ma(Eocene to Oligocene)and 22~7 Ma(Miocene).The thermal history modeled from apatite fission track shows that the uplift of the north margin of Altyn since Cenozoic has certain integrity and regional difference:At the early stage of Cenozoic,the integral uplift of the north margin of Altyn is slow;from Eocene to Oligocene,the uplift is fast at west to and slow at east;Since Miocene the Altyn area experiences a strong regional uplift event,which shows uplift trend of the mountain at the north margin of Altyn is early earlier at in the east to and later at in the west uplift trend of the Hongliugou-Lapeiquan melange belt at the north margin of Altyn.

关 键 词：裂变径迹 中一新生代 隆升剥蚀 热演化史 阿尔金北缘 

分 类 号：P542.2[天文地球—构造地质学] P597[天文地球—地质学]