Discovery of a Hadean xenocrystic zircon in the Cathaysia Block  

华夏板块发现冥古宙捕掳锆石

作　　者：Youyue Lu Jingya Cao Jianming Fu Lei Liu Qianhong Wu Xiaoyong Yang Shengxiong Yang Shunbo Cheng Xiaofei Qiu Ding He 卢友月;曹荆亚;付健明;刘磊;吴堑虹;杨晓勇;杨胜雄;程顺波;邱啸飞;何丁(Research Center for Petrogenesis and Mineralization of Granitoid Rocks,China Geological Survey,Wuhan 430205,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China;Department of Ocean Science,the Hong Kong University of Science&Technology,Hong Kong,China;Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education,Central South University,Changsha 410083,China;CAS Key Laboratory of Crust-Mantle Materials and Environments,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]Research Center for Petrogenesis and Mineralization of Granitoid Rocks,China Geological Survey,Wuhan 430205,China [2]Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China [3]Department of Ocean Science,the Hong Kong University of Science&Technology,Hong Kong,China [4]Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education,Central South University,Changsha 410083,China [5]CAS Key Laboratory of Crust-Mantle Materials and Environments,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China

出　　处：《Science Bulletin》2022年第23期2416-2419,M0004,共5页科学通报（英文版）

基　　金：supported by the Chinese Postdoctoral Science Foundation (2022M710876);the Natural Science Foundation of Anhui Province (2108085MD133);the China Geological Survey (DD20190154 and DD20221689);the PI Project of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (GML2020GD0802)。

摘　　要：The early history of Earth is poorly understood,due to the lack of ancient rocks formed after the formation of the newborn Earth,especiallyfor thefirst 500 million years(Hadean Eon).To our knowledge,this period is the most geodynamically vigorous in the crustal evolution history of Earth[1],and is characterized by intense collision with meteorites and the formation of a global magma ocean(~4.41 Ga;cf.review article by Ref.[2]).由于缺少冥古宙岩石的证据,对地球冥古宙地壳演化模式仍缺乏深入认识.锆石作为火成岩中常见的副矿物,由于其独特的物理化学稳定性,在研究岩石成因以及地壳演化等方面发挥着重要作用.因此,本文对华夏板块汤湖岩体中新发现的冥古宙捕掳锆石开展了一系列U-Pb年代学和Lu-Hf同位素地球化学研究.结果表明,该锆石具有明显的核幔结构,核部年龄为4102±12 Ma且具有较高的Th/U比(0.48)和ε_(Hf)(t)值(0.07),证实了该捕掳锆石属岩浆成因且形成于冥古宙.本文提出了两种假说且均可解释该锆石的成因:(1)其由4200Ma的亏损地幔派生出的岩石在4100 Ma经历再造;和(2)其由原始地幔在4100 Ma派生出.但是不管是哪种模式都指示了地球在冥古宙存在新生地壳的生长事件.

关 键 词：冥古宙 华夏板块 地壳演化 岩石成因 原始地幔 新生地壳 亏损地幔 岩浆成因 

分 类 号：P534.1[天文地球—古生物学与地层学]