赣东北中元古界铁沙街组石英角斑岩和流纹岩锆石SHRIMP U-Pb年龄、Hf同位素及地球化学特征

被引：14

作者：

张恒

李廷栋

高林志

耿树方

丁孝忠

刘燕学

寇彩化

机构：

[1] 中国地质科学院地质研究所

来源：

地质论评 | 2015年 / 61卷 / 01期

关键词：

中元古界铁沙街组; 石英角斑岩; 流纹岩; SHRIMP锆石U-Pb年龄; 锆石Hf同位素; 元素地球化学; 华夏陆块; 赣东北;

D O I：

10.16509/j.georeview.2015.01.012

中图分类号：

P597 [同位素地质学与地质年代学]; P588.1 [岩浆岩（火成岩）];

学科分类号：

070902 ; 070901 ;

摘要：

本文首次测得江西弋阳中元古界铁沙街组石英角斑岩SHRIMP锆石U-Pb年龄为1154±5 Ma。测定发现铁沙街组石英角斑岩和流纹岩高SiO2（73.53%81.11%）,低CaO（0.06%0.11%）、Na2O（0.05%2.77%）,K2O为2.16%6.43%和Al2O3为11.06%13.96%;在Zr/TiO2—Nh/Y微量元素分类图解上绝大多数样品落于碱性流纹岩区域;在SiO2—FeO/MgO图解中绝大多数样品位于钙碱性岩石系列区域;稀土总量（ΣREE）为182.48×10-6818.82×10-6,轻稀土较富集,铕明显负异常（δEu=0.20O.45）;在原始地幔标准化图解中,表现出亏损大离子亲石元素（Ba、Sr、Ti、P）和富集高场强元素（Nb、Ta、La、Ce、Zr、Hf、Sm）。铁沙街组石英角斑岩和流纹岩的锆石的εHf（t）值分别为-6.1～5.3和-2.3～4.8,两阶段Hf模式年龄分别为1653～2380 Ma和1675～2132 Ma。锆石Hf同位素特征显示铁沙街组石英角斑岩、流纹岩的成因主要为岩石圈拆沉,深部地幔物质上涌,并由此造成的古元古代晚期下地壳物质的部分熔融。综上认为,铁沙街组石英角斑岩和流纹岩形成于中元古界后造山阶段的板内环境,可能与华夏陆块板内裂谷减薄开裂阶段的地幔物质上涌有关。

引用

页码：65 / 78

页数：14

共 48 条

[11]

The Neoproterozoic–Early Paleozoic tectonic evolution of the South China Block: An overview[J] . Jacques Charvet.Journal of Asian Earth Sciences . 2013

[12]

Amalgamation between the Yangtze and Cathaysia Blocks in South China: Constraints from SHRIMP U–Pb zircon ages, geochemistry and Nd–Hf isotopes of the Shuangxiwu volcanic rocks[J] . Xian-Hua Li,Wu-Xian Li,Zheng-Xiang Li,Ching-Hua Lo,Jian Wang,Mei-Fang Ye,Yue-Heng Yang.Precambrian Research . 2009 (1)

[13]

Geochronology and Hf isotopes of zircon from volcanic rocks of the Shuangqiaoshan Group, South China: Implications for the Neoproterozoic tectonic evolution of the eastern Jiangnan orogen[J] . Xiao-Lei Wang,Guochun Zhao,Jin-Cheng Zhou,Yongsheng Liu,Jian Hu.Gondwana Research . 2008 (3)

[14]

Detrital zircon geochronology of Precambrian basement sequences in the Jiangnan orogen: Dating the assembly of the Yangtze and Cathaysia Blocks[J] . Xiao-Lei Wang,Jin-Cheng Zhou,W.L. Griffin,Ru-Cheng Wang,Jian-Sheng Qiu,S.Y. O’Reilly,Xisheng Xu,Xiao-Ming Liu,Gui-Lin Zhang.Precambrian Research . 2007 (1)

[15]

850–790 Ma bimodal volcanic and intrusive rocks in northern Zhejiang, South China: A major episode of continental rift magmatism during the breakup of Rodinia[J] . Xian-Hua Li,Wu-Xian Li,Zheng-Xiang Li,Ying Liu.LITHOS . 2007 (1)

[16]

Age and origin of middle Neoproterozoic mafic magmatism in southern Yangtze Block and relevance to the break-up of Rodinia[J] . Jibin Zhou,Xian-Hua Li,Wenchun Ge,Zheng-Xiang Li.Gondwana Research . 2006 (1)

[17] USA [J].

不详 .

INTERNATIONAL JOURNAL OF HEALTH CARE QUALITY ASSURANCE, 2006, 19 (01)

[18] Trace element and isotopic composition of GJ-red zircon standard by laser ablation [J].

Elhlou, S. ;

Belousova, E. ;

Griffin, W. L. ;

Pearson, N. J. ;

O'Reilly, S. Y. .

GEOCHIMICA ET COSMOCHIMICA ACTA, 2006, 70 (18) :A158-A158

[19]

Neoproterozoic bimodal magmatism in the Cathaysia Block of South China and its tectonic significance[J] . Wu-Xian Li,Xian-Hua Li,Zheng-Xiang Li.Precambrian Research . 2004 (1)

[20]

The application of SHRIMP to Phanerozoic geochronology;a critical appraisal of four zircon standards[J] . Lance P Black,Sandra L Kamo,Ian S Williams,Roland Mundil,Donald W Davis,Russell J Korsch,Chris Foudoulis.Chemical Geology . 2003 (1)

← 1 2 3 4 5 →