扬子陆核的生长和再造:锆石U-Pb年龄和Hf同位素研究

被引：48

作者：

张少兵

郑永飞

机构：

[1] 中国科学技术大学地球和空间科学学院中国科学院壳幔物质与环境重点实验室

来源：

岩石学报 | 2007年 / 02期

关键词：

扬子陆块; 前寒武纪; 大陆生长与再造; 锆石U-Pb年龄; 锆石Hf同位素;

D O I：

暂无

中图分类号：

P597 [同位素地质学与地质年代学];

学科分类号：

摘要：

对宜昌三峡附近崆岭杂岩中混合岩、片麻岩和变沉积岩以及莲沱砂岩进行了锆石U-Pb和Hf-O同位素研究,研究结果深化了我们对扬子陆核生长和再造的认识。在莲沱砂岩中发现了老达3.8Ga的碎屑锆石,说明扬子陆块可能存在这个年龄的地壳物质;其Hf同位素组成指示初生地壳生长出现在4.0Ga。崆岭杂岩中混合岩和片麻岩的U-Pb年龄表明,在3.2～3.3Ga和2.9～3.0Ga有两期重要的岩浆活动,指示扬子陆核可能于中太古代就开始形成。锆石Hf同位素研究则指示,其原岩至少从3.5Ga就开始从亏损地幔分异出来。混合岩和变沉积岩中所记录的1.9～2.0Ga变质事件,是扬子陆核再造并发生克拉通化的主要时期。而广泛分布于扬子陆块周边的新元古代岩浆活动不仅导致了许多太古宙和古元古宙地壳重熔,而且引起了初生地壳的快速再造。

引用

页码：393 / 402

页数：10

共 23 条

[1] 鄂西崆岭杂岩的组成、时代及地质演化 [J].

马大铨 ;

李志昌 ;

肖志发 .

地球学报, 1997, (03) :10-18

[2] 直接测定颗粒锆石207Pb/206Pb年龄的方法 [J].

袁海华 ;

张志兰 ;

刘炜 ;

卢秋霞 .

矿物岩石, 1991, (02) :72-79

[3]

Contrasting zircon Hf and O isotopes in the two episodes of Neoproterozoic granitoids in South China: Implications for growth and reworking of continental crust[J] . Yong-Fei Zheng,Shao-Bing Zhang,Zi-Fu Zhao,Yuan-Bao Wu,Xianhua Li,Zhengxiang Li,Fu-Yuan Wu.LITHOS . 2006 (1)

[4]

U–Pb, Hf and O isotope evidence for two episodes of fluid-assisted zircon growth in marble-hosted eclogites from the Dabie orogen[J] . Yuan-Bao Wu,Yong-Fei Zheng,Zi-Fu Zhao,Bing Gong,Xiaoming Liu,Fu-Yuan Wu.Geochimica et Cosmochimica Acta . 2006 (14)

[5]

Zircon U–Pb age and Hf isotope evidence for 3.8 Ga crustal remnant and episodic reworking of Archean crust in South China[J] . Shao-Bing Zhang,Yong-Fei Zheng,Yuan-Bao Wu,Zi-Fu Zhao,Shan Gao,Fu-Yuan Wu.Earth and Planetary Science Letters . 2006 (1)

[6]

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[7]

Zircon isotope evidence for ≥3.5＜ce:hsp sp="0.25"/＞Ga continental crust in the Yangtze craton of China[J] . Shao-Bing Zhang,Yong-Fei Zheng,Yuan-Bao Wu,Zi-Fu Zhao,Shan Gao,Fu-Yuan Wu.Precambrian Research . 2006 (1)

[8]

Reworking of juvenile crust: Element and isotope evidence from Neoproterozoic granodiorite in South China[J] . Rong-Xin Wu,Yong-Fei Zheng,Yuan-Bao Wu,Zi-Fu Zhao,Shao-Bing Zhang,Xiaoming Liu,Fu-Yuan Wu.Precambrian Research . 2006 (3)

[9]

Zircon U-Pb age and Hf-O isotope evidence for Paleoproterozoic metamorphic event in South China[J] . Shao-Bing Zhang,Yong-Fei Zheng,Yuan-Bao Wu,Zi-Fu Zhao,Shan Gao,Fu-Yuan Wu.Precambrian Research . 2006 (3)

[10]

Metamorphic effect on zircon Lu–Hf and U–Pb isotope systems in ultrahigh-pressure eclogite-facies metagranite and metabasite[J] . Yong-Fei Zheng,Yuan-Bao Wu,Zi-Fu Zhao,Shao-Bing Zhang,Ping Xu,Fu-Yuan Wu.Earth and Planetary Science Letters . 2005 (2)

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