|本期目录/Table of Contents|

[1]赖绍聪,朱韧之.四川泸定地区新元古代火山岩地球化学特征及其大陆动力学意义[J].地球科学与环境学报,2017,39(04):459-475.
　LAI Shao-cong,ZHU Ren-zhi.Geochemical Characteristics and Its Continental Dynamic Implication of Neoproterozoic Volcanic Rocks in Luding Area of Sichuan, China[J].Journal of Earth Sciences and Environment,2017,39(04):459-475.
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四川泸定地区新元古代火山岩地球化学特征及其大陆动力学意义(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第39卷
期数:
2017年第04期
页码:
459-475
栏目:
基础地质与矿产地质
出版日期:
2017-07-15

文章信息/Info

Title:
Geochemical Characteristics and Its Continental Dynamic Implication of Neoproterozoic Volcanic Rocks in Luding Area of Sichuan, China
文章编号:
1672-6561(2017)04-0459-17
作者:
赖绍聪; 朱韧之
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;  ZHU Ren-zhi
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:
火山岩; 地球化学; 大陆动力学; 新元古代; Rodinia超大陆; 扬子地块; 四川
Keywords:
volcanic rock;  geochemistry;  continental dynamics;  Neoproterozoic;  Rodinia supercontinent;  Yangtze Block;  Sichuan
分类号:
P588.1
DOI:
-
文献标志码:
A
摘要:
四川泸定地区火山岩属于扬子地块西缘岩浆岩带，是“康滇地轴”北段的重要组成部分，出露在现今龙门山断裂带与鲜水河断裂带的交汇部位。该火山岩形成年龄为(772.4±5.5)Ma，属于新元古代火山岩。岩石SiO2质量分数介于59.18％～72.44％，为一套典型的岩浆弧成因亚碱性高钾钙碱系列安山岩-英安岩-流纹岩组合。岩石微量及稀土元素具典型的岛弧火山岩特征，Nb和Ta强烈亏损，w(Nb)/w(Th)值为0.72～1.77，w(La)/w(Nb)值为3.12～7.36，w(Ta)/w(Yb)值为0.13～0.29，w(Th)/w(Yb)值为1.06～5.21，明显不同于大陆裂谷型火山岩组合以及与地幔柱相关的火山岩组合。岩石N(87Sr)/N(86Sr)值为0.737 169～0.743 441，N(143Nd)/N(144Nd)值为0.512 091～0.512 549，N(206Pb)/N(204Pb)值为18.670 1～18.882 3，N(207Pb)/N(204Pb) 值为15.663 3～15.677 4，N(208Pb)/N(204Pb) 值为38.717 2～39.177 4，εNd(t)值为-2.76～6.00，这充分表明在新元古代时期本区的构造背景为岛弧系统。由俯冲作用导致的地幔物质上涌，引起大陆边缘弧地壳熔融，形成了泸定地区这套陆缘弧中酸性火山岩组合。
Abstract:
Neoproterozoic volcanic rocks in Luding area of Sichuan, China, belong to the western margin of Yangtze Block, and are the important part of the northern “Xikang-Yunnan axis”. They are exposed in the convergent region between Longmenshan and Xianshuihe fault zones. The results show that the formation age of the volcanic rocks is (772.4±5.5)Ma, belonging to Neoproterozoic; mass fraction of SiO2 is 59.18%-72.44%, and the rock is a set of andesite-dacite-rhyolite of typical high-K calc-alkaline series with magmatic arc generation; the trace and rare earth elements have geochemical characteristics of typical islandarc volcanic rock; Nb and Ta are obviously depleted, and w(Nb)/w(Th), w(La)/w(Nb), w(Ta)/w(Yb) and w(Th)/w(Yb) are 0.72-1.77, 3.12-7.36, 0.13-0.29 and 1.06-5.21, respectively, so that the volcanic rocks are obviously different from the volcanic associations of continental rift-related and mantle plume; N(87Sr)/N(86Sr), N(143Nd)/N(144Nd), N(206Pb)/N(204Pb), N(207Pb)/N(204Pb) and N(208Pb)/N(204Pb) are 0.737 169-0.743 441, 0.512 091-0.512 549, 18.670 1-18.882 3, 15.663 3-15.677 4 and 38.717 2-39.177 4, respectively, and εNd(t) is -2.76-6.00; the tectonic setting in Neoproterozoic is island arc system. The Sr-Nd-Pb isotopic compositions suggest that the original magma should be derived from juvenile reservoir of a subduction zone. The upwelling of mantle material derived by subduction causes the crustal melting of continental marginal arc, and forms the continental marginal arc intermediate-acid volcanic rock association.

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备注/Memo

备注/Memo:
收稿日期:2017-05-11
基金项目:国家自然科学基金项目(41372067);国家自然科学基金创新研究群体项目(41421002)
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: 2017-07-28