东天山百灵山-尾亚地区花岗质岩体侵位深度及其地质意义  

Uplift and Denudation Range of Granitic Plutons in the Bailingshan-Weiya Area,Eastern Tianshan Mountains and Its Geological Significance

作　　者：吴慧芸 宫相宽 吴学谦 木热地力·买合苏提 谭俊 杨浩东 WU Huiyun;GONG Xiangkuan;WU Xueqian;MUREDILI Maihesuti;TAN Jun;YANG Haodong(Xinjiang Key Laboratory of Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt,School of Geology and Mining Engineering,Xinjiang University,Urumqi Xinjiang 830017,China)

机构地区：[1]新疆大学地质与矿业工程学院新疆中亚造山带大陆动力学与成矿预测自治区重点实验室,新疆乌鲁木齐830017

出　　处：《新疆大学学报（自然科学版中英文）》2024年第6期687-701,共15页Journal of Xinjiang University(Natural Science Edition in Chinese and English)

基　　金：国家自然科学基金“南阿尔金尤努斯萨依地区含莫桑石退变榴辉岩变质演化与莫桑石成因研究”(42302059);新疆维吾尔自治区自然科学基金“新疆木吉钙华形成机制及成因”(2022D01C660).

摘　　要：东天山的形成和演化是地学界长期关注的科学问题之一,但关于该地区晚古生代以来山体抬升剥露幅度的研究较少,制约了对东天山晚古生代以来造山过程的理解.以东天山百灵山、阿奇山、尾亚、天湖岩体为研究对象,在详细野外地质调查的基础上,进行了系统的黑云母、角闪石矿物结晶压力计算,以此确定这些岩石的侵位深度和侵位后的抬升剥露幅度.结果表明:百灵山二长花岗岩、英云闪长岩、花岗闪长岩的抬升剥露深度分别为3.2~5.0 km、2.7~3.9 km和1.9~3.3 km,阿奇山二长花岗岩和正长花岗岩的抬升剥露深度分别为4.4~5.3 km和4.5~5.7 km,尾亚二长花岗岩和花岗闪长岩的抬升剥露深度分别为4.1~6.9 km和4.5~7.0 km,天湖二长花岗岩和花岗闪长岩的抬升剥露深度分别为3.0~5.4 km和2.1~3.7 km.结合现有研究,认为东天山自晚石炭世以来抬升剥露幅度整体不大(≤5.5 km),但东段与西段存在差异性隆升现象,东段侵入体的抬升剥露幅度和平均速率差异更大.综合区域地质研究成果,认为这种差异性可能与晚古生代-早中生代期间区内塔里木板块与准噶尔-哈萨克斯坦板块的斜向碰撞有关,同时受到松潘-甘孜、羌塘和拉萨等条带状地体与东昆仑地体发生SSW-NNE向碰撞拼贴的影响.The uplift history of the eastern Tianshan Mountains has attracted much attention from geologists.However,only a few researches have been done on the uplift and denudation range of rocks since the Late Paleozoic in the region,which limits the understanding of the orogenetic process.In this study,we systematically calculate the crystallization pressure of biotite and amphibole from granitic rocks in the eastern Tianshan Mountains to determine their emplacement depth,and uplift and denudation range of these rocks.The results reveal that the uplift and denudation ranges of monzogranite,tonalite,and granodiorite from Bailingshan pluton are 3.2~5.0 km,2.7~3.9 km and 1.9~3.3 km,respectively,while those of monzogranite and syenogranite from Aqishan pluton are 4.4~5.3 km and 4.5~5.7 km,respectively.The uplift and denudation ranges of monzogranite and granodiorite from Weiya pluton are 4.1~6.9 km and 4.5~7.0 km,respectively.Whereas for Tianhu monzogranite and granodiorite,their emplacement depth are 3.0~5.4 km and 2.1~3.7 km,respectively.Combined with the existing studies,the uplift and denudation ranges of the eastern Tianshan Mountains since the Late Carboniferous are relatively small(≤5.5 km).However,a notable difference in uplift ranges and average rates between the eastern and western sections of the eastern Tianshan Mountains were observed.Concerning the comprehensive regional geological research results,this difference may be related to the oblique collision between the Tarim plate and the Junggar-Kazakhstan plate during the Late Paleozoic-Early Mesozoic,and it is also affected by the SSW-NNE collision between the Songpan-Ganzi,Qiangtang,Lhasa and the East Kunlun terranes.

关 键 词：花岗质岩石 地质压力计 侵位深度 东天山 

分 类 号：P542[天文地球—构造地质学] P574.2[天文地球—地质学]