基性岩的岩浆混合作用：来自华南三个中生代辉长岩的矿物学证据

The Chebu gabbro of southern Jiangxi, Youxindi gabbro of western Fujian and Shangfang gabbro of southeastern Fujian, which are belonged to the Mesozoic magmatism activity, are chacterized by the obvious magma mixing.The tectonic setting of the three gabbro complex are gradually change from the continent extension to the active continent margin along a temporal migration rule from west to early,from inland to coast and from early to late. Based on the petrographic and mineralogic observation and systemic trace-elements and isotopic analyse of minerals (e.g. zircon，baddeleyite,apatite, pyroxene,plagioclase etc.), we aim to discriminate the nature and source of two or more magma mixing member and examine the trait and form of basaltic magma mixing in the different tectonic setting,and then study the influence of magma mixing on the basaltic magma member.As the special temporal relation of three gabbro complex in the Nanling magmatism belt, the contrastive study of their mantle sources and magma mixing characteristic will be of great benefit to provide the constrains concering the Mesozoic geodynamic setting of South China.

赣南车步辉长岩、闽西南油心地辉长岩和闽东南漳州上房辉长岩这三个岩体是华南中生代岩浆岩，具有岩浆混合作用的明显特征。三个岩体从西向东、从内陆到沿海分布，形成的构造背景也从陆内伸展演变为活动大陆边缘环境。本申请基于对赣南车步辉长岩、闽西南油心地辉长岩和闽东南漳州上房辉长岩三个岩体岩相学和矿物学观察，通过造岩石矿物和副矿物（如斜长石、辉石、磷灰石、锆石、斜锆石等）微区元素及同位素地球化学的系统测试分析，判别发生混合作用的两个或多个岩浆端元的性质与源区特征、分析在不同构造背景中基性岩浆混合作用的表现和特征，进而研究岩浆混合作用对基性岩石成因的影响。鉴于这三个基性岩体在华南中生代岩浆岩的特殊时空关系，通过混合端元性质及地幔源区的对比研究，将有助于为华南中生代一级动力学背景研究提供制约。

赣南车步辉长岩、闽西南油心地辉长岩和闽东南漳州上房辉长岩这三个岩体是华南中生代岩浆岩，具有岩浆混合作用的明显特征。三个岩体从西向东、从内陆到沿海分布，形成的构造背景也从陆内伸展演变为活动大陆边缘环境。基于对赣南车步辉长岩、闽西南油心地辉长岩和闽东南漳州上房辉长岩三个岩体岩相学和矿物学观察，通过造岩矿物和副矿物――斜长石、辉石等微区元素的系统测试分析，判别发生混合作用的两个或多个岩浆端元的性质与源区特征、分析在不同构造背景中基性岩浆混合作用的表现和特征，为华南中生代一级动力学背景研究提供制约。