锆石U-Pb年代学和地球化学对浙皖马鞍山高分异岩体成因的约束

被引:17
作者
张建芳
汪隆武
陈津华
朱朝晖
刘健
章明圆
机构
[1] 浙江省地质调查院
关键词
锆石U-Pb; 地球化学; 岩石成因; 马鞍山岩体; 浙皖相邻区.;
D O I
暂无
中图分类号
P597.3 []; P581 [岩石成因];
学科分类号
070902 ; 070901 ;
摘要
为了解由早期(伟晶、巨晶)斑状二长花岗岩、中期(细粒)花岗岩和晚期花岗(斑)岩脉组成的马鞍山杂岩体的成因,采用SHRIMP和LA-ICP-MS锆石U-Pb法厘定其侵入时代,年龄显示伟晶斑状二长花岗岩为132.2±1.6Ma,巨晶斑状二长花岗岩为127.7±1.2Ma,细粒花岗岩为128.3±1.1Ma,花岗斑岩脉为127.4±1.8Ma.岩石地球化学研究结果表明岩体从早到晚具有从钾玄岩系列向高钾钙碱系列演变特征,分异演化程度逐渐变高;斑状二长花岗岩具有高REE含量,轻重稀土分异较为明显,具较强负铕异常和弱右倾的配分曲线特征,富集K、Th、U、Rb等元素,弱亏损Ba、Sr、P、Nb、Ta、Ti等元素;细粒花岗岩及花岗(斑)岩脉具有较低REE含量,轻重稀土分异不明显,具强负铕异常和"V"型配分曲线特征,富集K、Th、U、Rb等元素,强亏损Ba、Sr、P、Nb、Ti等元素.马鞍山岩体为浙西北-皖南地区早白垩世俯冲造山后陆内拉张作用环境下下地壳部分熔融的同源岩浆侵位结晶分异作用形成的产物,具有高分异I型花岗岩的特征.
引用
收藏
页码:98 / 114
页数:17
相关论文
共 56 条
[11]  
Adakitic rocks from slab melt-modified mantle sources in the continental collision zone of southern Tibet[J] . Yongfeng Gao,Zhusen Yang,M. Santosh,Zengqian Hou,Ruihua Wei,Shihong Tian.LITHOS . 2010 (3)
[12]  
Geochemical and zircon U–Pb and Hf isotopic study of the Baijuhuajian metaluminous A-type granite: Extension at 125–100 Ma and its tectonic significance for South China[J] . Jean Wong,Min Sun,Guangfu Xing,Xian-hua Li,Guochun Zhao,Kenny Wong,Chao Yuan,Xiaoping Xia,Longming Li,Fuyuan Wu.LITHOS . 2009 (3)
[13]  
Late Mesozoic magmatism from the Daye region, eastern China: U–Pb ages, petrogenesis, and geodynamic implications[J] . Jian-Wei Li,Xin-Fu Zhao,Mei-Fu Zhou,Chang-Qian Ma,Zorano Sérgio Souza,Paulo Vasconcelos.Contributions to Mineralogy and Petrology . 2009 (3)
[14]  
Early cretaceous subduction-related adakite-like rocks of the Gangdese Belt, southern Tibet: Products of slab melting and subsequent melt–peridotite interaction?[J] . Di-Cheng Zhu,Zhi-Dan Zhao,Gui-Tang Pan,Hao-Yang Lee,Zhi-Qiang Kang,Zhong-Li Liao,Li-Quan Wang,Guang-Ming Li,Guo-Chen Dong,Bo Liu.Journal of Asian Earth Sciences . 2008 (3)
[15]  
Post-collisional adakites in south Tibet: Products of partial melting of subduction-modified lower crust[J] . Zhengfu Guo,Marjorie Wilson,Jiaqi Liu.LITHOS . 2006 (1)
[16]  
U–Pb zircon, geochemical and Sr–Nd–Hf isotopic constraints on age and origin of Jurassic I- and A-type granites from central Guangdong, SE China: A major igneous event in response to foundering of a subducted flat-slab?[J] . Xian-Hua Li,Zheng-Xiang Li,Wu-Xian Li,Ying Liu,Chao Yuan,Gangjian Wei,Changshi Qi.LITHOS . 2006 (1)
[17]  
Adakites without slab melting: High pressure differentiation of island arc magma, Mindanao, the Philippines[J] . Colin G. Macpherson,Scott T. Dreher,Matthew F. Thirlwall.Earth and Planetary Science Letters . 2006 (3)
[18]  
Origin of adakitic intrusives generated during mid-Miocene east–west extension in southern Tibet[J] . Z.-Q Hou,Y.-F Gao,X.-M Qu,Z.-Y Rui,X.-X Mo.Earth and Planetary Science Letters . 2004 (1)
[19]  
The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U–Pb zircon geochronology[J] . Simon E. Jackson,Norman J. Pearson,William L. Griffin,Elena A. Belousova.Chemical Geology . 2004 (1)
[20]  
Jurassic Gabbro-Granite-Syenite Suites from Southern Jiangxi Province, SE China: Age, Origin, and Tectonic Significance[J] . Xian-Hua Li,Zhigang Chen,Dunyi Liu,Wu-Xian Li.International Geology Review . 2003 (10)