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[1]赖绍聪,秦江锋.勉略缝合带三岔子辉绿岩墙锆石U-Pb年龄及Hf同位素组成——古特提斯洋壳俯冲的年代学证据[J].地球科学与环境学报,2010,32(01):27-33.
　LAI Shao-cong,QIN Jiang-feng.Zircon U-Pb Dating and Hf Isotopic Composition of the Diabase Dike Swarm from Sanchazi Area, Mianlue Suture——Chronology Evidence for the Paleo-Tethys Oceanic Crust Subduction[J].Journal of Earth Sciences and Environment,2010,32(01):27-33.
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勉略缝合带三岔子辉绿岩墙锆石U-Pb年龄及Hf同位素组成——古特提斯洋壳俯冲的年代学证据(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第32卷
期数:
2010年第01期
页码:
27-33
栏目:
基础地质与矿产地质
出版日期:
2010-03-15

文章信息/Info

Title:
Zircon U-Pb Dating and Hf Isotopic Composition of the Diabase Dike Swarm from Sanchazi Area, Mianlue Suture——Chronology Evidence for the Paleo-Tethys Oceanic Crust Subduction
文章编号:
1672-6561(2010)01-0027-07
作者:
赖绍聪1; 2; 秦江锋1; 2
(1.西北大学 大陆动力学国家重点实验室,陕西 西安 710069; 2.西北大学 地质学系,陕西 西安 710069)
Author(s):
LAI Shao-cong1; 2;  QIN Jiang-feng1; 2
(1.State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, Shaanxi, China; 2.Department of Geology, Northwest University, Xi'an 710069, Shaanxi, China)
关键词:
锆石; U-Pb定年; Hf同位素; 勉略洋; 岛弧; 三岔子
Keywords:
Zircon;  U-Pb dating;  Hf isotopic;  Mianlue ancient ocean basin;  island-arc;  Sanchazi
分类号:
P588.1
DOI:
-
文献标志码:
A
摘要:
为了弄清楚勉略构造带中三岔子岛弧火山岩的形成时代及源区特征,对南秦岭勉略缝合带三岔子岛弧蛇绿混杂岩中的辉绿岩墙样品进行了锆石U-Pb年代学、锆石Hf同位素组成及微量元素组成研究。结果表明,三岔子辉绿岩中的锆石主要包括2个年龄区间:有8颗锆石记录古生代年龄信息,其n(206Pb)/n(238U)年龄为264～487Ma,w(Th)/w(U)为0.4～0.8,其中有6颗锆石的N(176Hf)/N(177Hf)初始值为0.281934～0.282292,对应的ε<sub>Hf(t)值为-9.4～-16.4,为典型的壳源岩浆锆石,另外2个测点(BQG-014,BQG-021)的N(176Hf)/N(177Hf)为0.282722～0.282798,对应的ε<sub>Hf(t)值为4.5～6.3,为典型的幔源岩浆锆石;有15颗锆石记录了元古代—太古代的年龄信息,N(207Pb)/N(206Pb)年龄主要为1713～2559Ma,N(176Hf)/N(177Hf)初始值为0.281288～0.282263,对应的ε<sub>Hf(t)值为-1.3～8.7,绝大部分锆石的ε<sub>Hf(t)值大于2,显示出幔源岩浆锆石的特征。根据锆石Hf同位素组成,BQG-014和BQG-021样品为典型的幔源岩浆锆石,因此,其形成年龄(264～295Ma)应代表了勉略洋消减过程中一次重要的大陆弧岩浆作用时间。
Abstract:
In order to make it clear that the formation age and source region of Sanchazi island arc volcanic rocks from the Mianlue suture, Ziron U-Pb dating, Hf isotopic composition and trace element concentration on the Diabase dike swarm collected from island-arc ophiolitic mélange in Mianlue suture, south Qinling are studied. The result indicates two time periods of the zircon U-Pb ages. There are eight zirons recording the Paleozoic U-Pb ages, six of them are typical crust originated magmatic, n(206Pb)/n(238U)=264～487 Ma, w(Th)/w(U)=0.4～0.8, N(176Hf)/N(177Hf)=0.281 934～0.282 292, ε<sub>Hf(t)=-9.4～-16.4, the other two Zirons in two test points(BQG-014, BQG-021)are typical mantle originated magmatic, N(176Hf)/N(177Hf)=0.282 722～0.282 798, ε<sub>Hf(t)=4.5～6.3. There are fifteen zirons recording the Proterozoic-Archean U-Pb ages, Zircon shows distinct geochemical characteristics of mantle magmatic origination, N(207Pb)/N(206Pb)=1 713～2 559 Ma, N(176Hf)/N(177Hf)=0.281 288～0.282 263, ε<sub>Hf(t)=-1.3～8.7, and most exhibit ε<sub>Hf(t)>2. According to the zircon Hf isotopic composition, Ziron in two test points(BQG-014, BQG-021)is typical mantle originated magmatic; therefore, their forming age(264～295 Ma)indicates an important active continental margin magmatism during the Mianlue ancient ocean crust subduction process.

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备注/Memo

备注/Memo:
收稿日期:2009-06-30
基金项目: 高等学校博士点基金项目(20040697003)
作者简介: 赫 英(1944-),男,吉林长春人,教授,从事矿床和地球化学研究。E-mail:heying@nwu.edu.cn; he69ying@126.com
更新日期/Last Update: 2010-03-20