安徽铜陵地区燕山期侵入岩的成因及其对深部动力学过程的制约

被引:202
作者
王强
许继峰
赵振华
熊小林
包志伟
机构
[1] 中国科学院广州地球化学研究所,中国科学院广州地球化学研究所,中国科学院广州地球化学研究所,中国科学院广州地球化学研究所,中国科学院广州地球化学研究所广州,,广州,,广州,,广州,,广州,
基金
国家攀登计划;
关键词
岩浆混合; adakite; 底侵作用; 拆沉作用; 橄榄玄粗岩; 铜陵;
D O I
暂无
中图分类号
P588.12 [侵入岩、深成岩];
学科分类号
070901 [矿物学、岩石学、矿床学];
摘要
铜陵地区燕山期侵入岩的岩石学、元素和同位素地球化学研究表明:(i)研究区SiO≤55%的侵入岩主要为橄榄玄粗质系列岩石,来自富集地幔的玄武质岩浆在上升过程中与下地壳物质发生低程度混染,混染后的岩浆进一步发生分离结晶作用形成了这些岩石;(ii)SiO2>55%的侵入岩主要为高钾钙碱性系列岩石,与埃达克岩(adakite)有许多类似地球化学特征,如富钠,高Al2O3,Sr,Sr/Y与La/Yb比值,大部分样品的Y<18×10-6,Yb<1.9×10-6,但与埃达克岩也有不同之处,如同位素组成((εNd(t)=-9.16~-16.55,(87Sr/86Sr)i=0.7068~0.7105以及相当一部分样品的Y>18×10-6,Yb>1.90×10-6。铜陵地区SiO2>55%的侵入岩很可能由幔源岩浆与玄武质下地壳熔融形成的埃达克质(adakite-like)岩浆混合形成。来自地幔的橄榄玄粗质岩浆底侵可能为下地壳熔融提供了热量。
引用
收藏
页码:323 / 334
页数:12
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