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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02期

页码:

214-224

栏目:

基础地质与矿产地质

出版日期:

2017-03-15

文章信息/Info

Title:

Petrogeochemical Methods for Quantitative Estimation of the Crustal Thickness of Orogenic Belt: Overview and Case Studies

文章编号:

1672-6561(2017)02-0214-11

作者:

官文慧; 汪洋

中国地质大学(北京) 地球科学与资源学院，北京 100083

Author(s):

GUAN Wen-hui;  WANG Yang

School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

关键词:

地壳厚度; 地球化学; 岩浆弧; 造山带; 冈底斯弧; 义敦岛弧; 福建; 辽宁

Keywords:

crustal thickness;  geochemistry;  magmatic arc;  orogenic belt;  Gangdese arc;  Yidun island arc;  Fujian;  Liaoning

分类号:

P595

DOI:

-

文献标志码:

A

摘要:

应用岩石地球化学数据定量、半定量估算岩浆弧地壳厚度的方法包括：钙碱性岩套K₂O含量、w(Sr)/w(Y)值、w(La)_N/w(Yb)_N值，玄武质岩石Na₂O含量、CaO含量、w(Ce)/w(Y)值等。目前提出的定量公式对厚度在20~45 km范围内的俯冲造山带地壳厚度反演结果可靠性较高。中酸性岩w(Dy)/w(Yb)值可以指示造山带是否存在加厚的地壳。应用岩石地球化学数据定量、半定量反演造山带地壳厚度的公式要求：明确其适用条件与应用范围；有足够数量的样本；进行数据筛选并且剔除离群值。藏南冈底斯弧的实例研究表明，w(La)_N/w(Yb)_N值能够估算碰撞造山带古地壳厚度，印度板块与亚洲大陆碰撞引起的地壳显著增厚导致冈底斯地体中酸性岩浆岩w(Sr)/w(Y)值、w(La)_N/w(Yb)_N值在40 Ma以来明显跃升。三江地区三叠纪义敦岛弧地壳厚度为60 km；福建长乐—南澳构造带早白垩世时期岩浆弧的地壳厚度为42 km；辽西地区中侏罗世—早白垩世时期火山岩地壳厚度为50~65 km。

Abstract:

The petrogeochemical data, which include K₂O content, w(Sr)/w(Y) and w(La)N/w(Yb)N of calc-alkaline suite, and Na₂O and CaO contents and w(Ce)/w(Y) of basaltic rocks, can be used to quantitatively or semi-quantitatively estimate the crustal thickness of magmatic arc. The quantitative formulas are reliable to calculate the crustal thickness (20-45 km) of subduction orogenic belt. w(Dy)/w(Yb) of intermediate-acidic rocks can constrain the thick crust with more than 50 km. The proper application for quantitatively or semi-quantitatively estimating the crustal thickness of orogenic belt requires that obeying the conditions and scopes of the method, gathering a dataset for analysis as large as possible, and doing data screen and outlier elimination. For the case of Gangdese in the southern Tibet, it concludes that w(La)_N/w(Yb)_N can be used to estimate the thickness of crustal thickness in the post-collisional environment. The remarkable jump of w(Sr)/w(Y) and w(La)_N/w(Yb)_N of intermediate magmatic rocks in Gangdese terrane since 40 Ma is due to the crust thickening caused by the collision between India plate and Asia continent. The crustal thickness of Triassic Yidun island arc in Sanjiang area is 60 km; that of Early Cretaceous magmatic arc in Changle-Nan’ao tectonic zone of Fujian is 42 km; that of Middle Jurassic-Early Cretaceous volcanic rocks in the western Liaoning is 50-65 km.

参考文献/References:

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备注/Memo

备注/Memo:

收稿日期:2016-12-15
基金项目:中国地质调查局地质调查项目(D1606-1);中央高校基本科研业务费专项资金项目(2652013021)
作者简介:官文慧(1993-),男,江西赣州人,工学硕士研究生,E-mail:whguan@cugb.edu.cn。
通讯作者:汪 洋(1969-),男,浙江杭州人,教授,理学博士,E-mail:allen_thalassa@sina.com。

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更新日期/Last Update: 2017-03-31