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龟山杂岩的形成时代、构造属性及变质条件:对秦岭-桐柏造山带构造演化的指示
投稿时间:2020-02-13  修订日期:2020-04-16  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020067
摘要点击次数: 48
全文下载次数: 41
作者单位E-mail
李加好 合肥工业大学 lijiahaohappy@sina.com 
邓聚 合肥工业大学  
王晴 合肥工业大学  
杨挺宇 合肥工业大学  
任升莲 合肥工业大学  
宋传中 合肥工业大学  
谭静 合肥工业大学  
陈守文 合肥工业大学  
中文摘要:秦岭-桐柏-大别造山带是华北板块和扬子板块碰撞拼合的产物。桐柏造山带作为古生代秦岭增生造山带与中生代大别碰撞造山带之间的纽带,记录了两大板块之间从洋壳俯冲、地体增生到最终的碰撞造山过程。本文选取桐柏造山带龟山杂岩为研究对象,对其中变沉积岩、斜长角闪岩和花岗质脉体进行了岩相学、矿物学和锆石U-Pb年代学研究。结果指示变沉积岩碎屑锆石年龄峰值主要为~411Ma,次要年龄峰值为~490Ma,最年轻四颗碎屑锆石给出的加权平均年龄为352±11Ma。斜长角闪岩原岩结晶时代为498±18Ma,花岗质脉形成时代为412.8±4.4 Ma,两者中变质锆石加权平均年龄为320±10Ma,指示它们共同经历了早石炭世变质作用。变质峰期温压条件为T=571-632℃,P=0.59-0.76GPa,属于中压相系角闪岩相变质。区域年代对比分析显示,龟山杂岩变沉积岩物源来自于北侧的北秦岭地体,属于弧前沉积,沉积时代下限为早石炭世早期。结合前人研究,本文认为在古秦岭洋向北的俯冲过程中,上述沉积岩与斜长角闪岩因构造作用拼贴在一起,于320Ma发生中压角闪岩相变质作用。研究结果也指示了古秦岭洋最终闭合时间可能晚于早石炭世早期。
中文关键词:秦岭-桐柏造山带  龟山杂岩  锆石U-Pb定年  变质条件
 
The formation age, tectonic setting and metamorphic conditions of the Guishan Complex: implications for the tectonic evolution of the Qinling- Tongbai orogenic belt
Author NameAffiliationE-mail
Li Jiahao Hefei University of Technology lijiahaohappy@sina.com 
Deng Ju Hefei University of Technology  
Wang Qing Hefei University of Technology  
Yang Tingyu Hefei University of Technology  
Ren Shenglian Hefei University of Technology  
Song Chuanzhong Hefei University of Technology  
Tan Jing Hefei University of Technology  
Chen Shouwen Hefei University of Technology  
Abstract:The Qinling-Tongbai-Dabie orogenic belt was formed as a result of the collision between the North China and Yangtze plates. The Tongbai orogen is located in a key area linking the Paleozoic Qinling accretionary orogen and the Mesozoic Dabie collisional orogen. It is an ideal place to unravel the tectonic evolution from the initial oceanic subduction, terrane accretion to the final continental collision between the two plates. Petrological, mineralogical and geochronological studies of meta-sedimentary rocks, amphibolites and granitic vein from the Guishan Complex in the Tongbai orogen were carried out in this study. Meta-sedimentary rocks of the Guishan Complex have a detrital zircon age spectrum with a peak at 411 Ma and subordinate peak age of 490Ma. The youngest weighted mean age of 352 ± 11 Ma constrained the lower limit of deposition age of the Guishan Complex. U-Pb zircon analyses reveal protolith ages of 498±18Ma for amphibolites and 412.8±4.4 Ma for granitic vein. Metamorphic zircon grains from amphibolites and granitic vein yielded ages of 320±10Ma, suggesting an Early Carboniferous metamorphic event. The peak metamorphic condition of the amphibolites is 571-632℃ and 0.59-0.76GPa, which belongs to amphibolite facies of medium pressure facies series. The age spectrum of detrital zircons revealed the provenance of the meta-sedimentary rocks of the Guishan Complex were derived from the North Qinling terrane and it developed as forearc basin during the early Early Carboniferous. But it was subsequently incorporated with amphibolites into tectonic mélange by the northward subduction of the Paleo-Qinling Ocean. It also suggests that Paleo-Qinling Ocean did not close until early Early Carboniferous.
keywords:Qinling-Tongbai orogenic belt  Guishan Complex  zircon U-Pb dating  metamorphic conditions
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