北淮阳中生代adakite岩石地球化学特征及成因讨论

被引:36
作者
潘国强
陆现彩
于航波
机构
[1] 南京大学地球科学系
[2] 南京大学地球科学系 南京
[3] 南京
关键词
adakite; 中生代; 北淮阳;
D O I
暂无
中图分类号
P588.1 [岩浆岩(火成岩)];
学科分类号
070901 ;
摘要
大别山造山带后缘的北淮阳带发育大面积的中生代岩浆岩。其中,晚侏罗世至早白垩世早期(15~130Ma)的岩体具有与adakite类似的地球化学特征,SiO2>56%,高铝(SiO2>70%时,Al2O3>15%)、高锶(Sr>400μg/g)、钠质(Na2O3.34%~4.75%,Na2O/K2O>1)、低Y和Yb(Y≤18μg/g),Sr/Y>20~40,La/Yb>20,Eu无明显异常,Sr正异常。Adakite岩石类型为(石英)闪长岩、二长闪长岩-花岗闪长岩-二长花岗岩-花岗岩。矿物成分以更长石、微斜长石或正长石、镁质黑云母、石英为主,副矿物为磁铁矿+榍石十锆石+磷灰石组合,岩石含富云质和闪长质包体,属Ⅰ型花岗岩类。而早白垩世晚期<130Ma的岩体,属A型花岗岩,为非adakites花岗岩类。北淮阳adakites的形成可能与底侵到下地壳的玄武质岩石部分熔融有关,部分熔融比例在10%~>20%,并且在岩浆演化中有AFC过程。
引用
收藏
页码:541 / 550
页数:10
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