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科学通报  2015 

大别山早白垩世花岗岩类斜长石成分:分离结晶对全岩Sr-CaO关系的影响

DOI: 10.1360/csb2015-60-2-198, PP. 198-205

Keywords: 埃达克岩,加厚下地壳,斜长石成分,分离结晶,Sr-CaO关系

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Abstract:

从高Sr/Y中酸性岩石中识别加厚下地壳熔体是利用其示踪地壳深部过程的重要前提之一.大别造山带早白垩世花岗岩类的研究表明加厚下地壳熔体应具有比普通花岗岩类更高Sr/CaO,在Sr-CaO图解上形成独特的高Sr演化趋势,可作为判别性指标之一.斜长石分离结晶在岩浆演化过程中普遍存在,可显著改变熔体的Sr和CaO含量,但是否会影响熔体的Sr/CaO尚不明确.本文测定了大别造山带早白垩世埃达克质和普通花岗岩类中斜长石的成分,并通过交换分配系数对斜长石分离结晶如何影响熔体的Sr/CaO进行了讨论.结果表明大量斜长石分离结晶也不会显著改变花岗质熔体的Sr/CaO,Sr-CaO相关趋势的斜率主要由其初始岩浆组成决定.熔体高Sr/CaO指示源区贫斜长石.因而,高斜率的Sr-CaO相关趋势可作为判断加厚下地壳熔体的重要标志.

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