|本期目录/Table of Contents|

[1]李永军,杨高学,庞振甲,等.天水渭北地区变质花岗岩类 岩石学特征及其地质时代[J].地球科学与环境学报,2007,29(01):6-10.
　LI Yong-jun,YANG Gao-xue,PANG Zhen-jia,et al.Petrologic Feature of Meta-Granitioids and Their Geological Ages in Weibei Area,Tianshui,Gansu Province[J].Journal of Earth Sciences and Environment,2007,29(01):6-10.
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第29卷
期数:
2007年第01期
页码:
6-10
栏目:
出版日期:
2007-03-15

文章信息/Info

Title:
Petrologic Feature of Meta-Granitioids and Their Geological Ages in Weibei Area,Tianshui,Gansu Province
作者:
李永军; 杨高学; 庞振甲; 刘静
长安大学地球科学与国土资源学院,陕西西安710054
Author(s):
LI Yong-jun; YANG Gao-xue; PANG Zhen-jia; LIU Jing
School of Earth Sciences and Resources Management, Chang’ an University, Xi’an 710054, Shaanxi, China
关键词:
变质花岗岩; 岩石学特征; 地质时代; 渭北地区; 天水; 甘肃省
Keywords:
meta-granitoid;  petrology;  geological age;  Weibei area;  Tianshui;  Gansu Province
分类号:
P581
DOI:
-
文献标志码:
A
摘要:
天水渭北地区地处祁连与北秦岭造山带结合部位。通过详细的岩石学特征、接触关系、形变及变质特征 研究证实,尽管岩体有较强烈的变质和变形作用,但岩体内保留有清晰的原生岩浆组构,岩体与围岩有清楚的侵 入关系,因而从变质地层中识别和解体出来众多的变质花岗岩类。主要成岩期及代表性岩类有:晚元古代为片 麻状正长花岗岩—二长花岗岩—花岗闪长岩,同位素年龄为953.4～1450Ma;震旦纪为片理化石英二长岩—石 英闪长岩,同位素年龄为547Ma。识别和解体出的这些变质花岗岩类,为进一步研究祁连和北秦岭两大构造单 元的岩浆事件和构造演化提供了十分重要的信息。
Abstract:
Weibei area is located in the joint of the Qilian and North Qinling orogenic belts. From detailed studies on the petrology,contact relation, deformation, metamorphism and so on,it is confirmed that although the granitoids had been strongly metamorphosed and deformed, they still contain clear primary fabrics. There are clear intrusive contact relations between the granitoids and their country rocks. So the meta-granitoids can be recognized and separated from the metamorphic sequences. They are grouped as the Mesoproterozoic- Neoproterozoic gneissoid granite-monzogranite-granodiorite, with their isotope ages of 953.4 Ma to 1 450 Ma, and the Sinian schistostose quartz monzogranite diorite. This offers important information for the study of magmatic event and tectonic environment in the area.

参考文献/References:

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[6] 李 永军,李注苍,丁 仨平,等. 西秦 岭温泉花岗岩体 的岩石学 特征及岩浆混合标志[J] . 长安大学学报 :地 球科学版,2003, 25(3):7-11.
[7] 李 永军,赵仁夫,李 注苍,等. 岩浆 混合花岗岩微量 元素成因 图解尝试[J] . 地球科学与球境学报,2004,26(3):7-12.
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[11] 李 永军,栾新东,付 国民,等. 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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备注/Memo

备注/Memo:
收稿日期:2006-05-20 基金项目:中国地质调查局地质调查项目(20001300010171) 作者简介:李永军(1961-),男,甘肃天水人,教授,博士,从事构造地质学、区域地质调查研究。E-mail:yongjunl@chd.edu.Cn
更新日期/Last Update: 1900-01-01