|本期目录/Table of Contents|

[1]赖绍聪,赵少伟.川西北塔公石英闪长岩地球化学特征和岩石成因[J].地球科学与环境学报,2015,37(03):1-13.
　LAI Shao-cong,ZHAO Shao-wei.Geochemistry and Petrogenesis of Quartz Diorite in Tagong Area of Northwest Sichuan[J].Journal of Earth Sciences and Environment,2015,37(03):1-13.
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第37卷
期数:
2015年第03期
页码:
1-13
栏目:
基础地质与矿产地质
出版日期:
2015-05-15

文章信息/Info

Title:
Geochemistry and Petrogenesis of Quartz Diorite in Tagong Area of Northwest Sichuan
文章编号:
1672-6561(2015)03-0001-13
作者:
赖绍聪; 赵少伟
1. 西北大学 大陆动力学国家重点实验室，陕西 西安 710069； 2. 西北大学 地质学系，陕西 西安 710069
Author(s):
LAI Shao-cong;  ZHAO Shao-wei
1. State Key Laboratory of Continental Dynamics, Northwest University, Xi’an 710069, Shaanxi, China; 2. Department of Geology, Northwest University, Xi’an 710069, Shaanxi, China
关键词:
石英闪长岩; 早白垩世; 地球化学; 岩石成因; 花岗岩; 下地壳局部熔融; 松潘—甘孜造山带; 川西北
Keywords:
quartz diorite;  Early Cretaceous;  geochemistry;  petrogenesis;  granite;  partial melting of lower crust;  Songpan-Ganzi orogenic belt;  Northwest Sichuan
分类号:
P588.12
DOI:
-
文献标志码:
A
摘要:
川西北塔公地区位于青藏高原东部，属于松潘—甘孜造山带的东南部边缘。塔公石英闪长岩侵位于晚三叠世地层中，岩体的K-Ar同位素年龄为134～136 Ma，形成于早白垩世。岩石SiO2质量分数为61.37%～62.25%，铝饱和指数为0.93～0.95，全碱质量分数为5.46%～5.77%，里特曼指数为1.62～1.74，样品属于亚碱性准铝质高钾钙碱系列石英闪长岩。岩石Mg#值较高，总体具有高Sr含量、低Nd含量的同位素地球化学特征。N（87Sr）/N（86Sr）值为0.712 589～0.713 009，初始N（87Sr）/N（86Sr）值为0.709 503～0.709 878，N（143Nd）/N（144Nd）值为0.512 135～0.512 196，εNd(t)值均为负（-8.6～-7.5），Nd模式年龄为1.33～1.41 Ga，Hf模式年龄为1.13～1.37 Ga。该岩体是早白垩世期间，川西北地区陆缘-陆内造山环境下由松潘—甘孜造山带古老的下地壳镁铁质物质局部熔融形成的晚碰撞-碰撞后非分异Ⅰ型花岗岩类。
Abstract:
Tagong area of Northwest Sichuan is located in the east of Qinghai-Tibet Plateau, and belongs to the southeast margin of Songpan-Ganzi orogenic belt. The quartz diorites in Tagong area form in Early Cretaceous with K-Ar isotopic ages of 134-136 Ma, and emplace into Late Triassic strata. Mass fractions of SiO2 are 61.37%-62.25%, A/CNK values are 0.93-0.95, mass fractions of total alkali are 5.46%-5.77%, Rittmann indexes are 1.62-1.74, so that the samples belong to subalkaline metaperaluminous high-K calc-alkaline series quartz diorites. The rocks have relative high Mg# values with the isotopic geochemical characteristics of high contents of Sr and low contents of Nd. N(87Sr)/N(86Sr) is 0.712 589-0.713 009 with the initial N(87Sr)/N(86Sr) of 0.709 503-0.709 878, N(143Nd)/N(144Nd) is 0.512 135-0.512 196 with negative εNd(t) of -8.6--7.5; Nd and Hf model ages are 1.33-1.41 Ga and 1.13-1.37 Ga, respectively. The quartz diorites belong to undifferentiation Ⅰ-type granitoids with late- to post-collision caused by partial melting of ancient lower crust mafic materials at the continental margin-intercontinental orogenic setting in Northwest Sichuan.

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备注/Memo

备注/Memo:
收稿日期:2015-01-13
基金项目:国家自然科学基金项目(41372067);国家自然科学基金重大研究计划项目(41190072);国家自然科学基金创新研究群体项目(41421002);教育部创新团队发展计划项目(IRT1281)
作者简介:赖绍聪(1963-),男,四川安岳人,教授,博士研究生导师,理学博士,E-mail:shaocong@nwu.edu.cn。
更新日期/Last Update: 2015-05-27