| 天水渭北地区花岗岩类的岩石地球化学特征 |
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| 引用本文： | 李永军,栾新东,付国民,李注苍.天水渭北地区花岗岩类的岩石地球化学特征[J].地质科技情报,2005,24(4):37-44. |
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| 作者姓名： | 李永军 栾新东 付国民 李注苍 |
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| 作者单位： | 1. 长安大学地球科学与国土资源学院,西安,710054
2. 新疆地质矿产勘查开发局地质九队,乌鲁木齐,830000 |
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| 基金项目： | 中国地质调查局地质调查项目 |
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| 摘 要： | 天水渭北地区地处祁连造山带与北秦岭造山带的结合部位.在渭河断裂以北出露广泛的花岗岩类属铝过饱和岩石,为钙碱性岩类.前石炭纪花岗岩类w(Al2O3)/w(Na2O K2O CaO)]值均小于1.1;石炭纪以来岩体w(Al2O3)/w(Na2O K2O CaO)]值大多大于1.1;岩体贫大离子亲石元素如Ba、Rb、Sr、Y、Ta、Be、B、Zr、Nb,低亲硫元素Ga、Cu,而高Mo、Sn、Bi、W等高温热液成矿元素和亲铁元素Sc、Cr、Ni、Co.稀土元素显示石炭纪以来岩体形成于稳定大陆环境,前石炭纪岩体的形成环境与造山作用密切相关.
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| 关 键 词： | 花岗岩 地球化学特征 渭北地区 甘肃天水 |
| 文章编号： | 1000-7849(2005)04-0037-08 |
| 收稿时间： | 2004-11-16 |
| 修稿时间： | 2004年11月16 |
Lithogeochemical Features of Granitiods from the Northern Area of Weihe River in Tianshui,Gansu Province |
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| LI Yong-jun,LUAN Xin-dong,FU Guo-min,LI Zhu-cang.Lithogeochemical Features of Granitiods from the Northern Area of Weihe River in Tianshui,Gansu Province[J].Geological Science and Technology Information,2005,24(4):37-44. |
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| Authors: | LI Yong-jun LUAN Xin-dong FU Guo-min LI Zhu-cang |
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| Abstract: | The northern area of Weihe River, located in the joint of the Qilian orogenic belt and North Qinling orogenic belt widely possesses exposed granitoids, and should belong to the aluminium supersaturation. The granitoids from Late Proterozoic to Devonian belong to calc-alkali series with the w (A12O3) / w(Na2O+K2O+CaO)3 less than 1. 1. The granitoids after Carboniferous belong to alkali series with the w(Al2O3)/w(Na2O+K2O+CaO)] exceeding 1. 1. The granite is characterized by poor in Ba,Rb,Sr,Y, Ta,Be,B,Zr,Nb,Ga,Cu,but higher hypothermal metallogenic elements such as Mo,Sn,Bi,W, and rich in siderophile elements such as Sc,Cr,Ni,Co. The REE elements show that the tectonic environment of granitoids is stable continent after Carboniferous, but closely related to the orogenesis before Carboniferous granitoids. |
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| Keywords: | granitoidl geochemistry feature northern area of Weihe River Tianshui region in Gansu Province |
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