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中文摘要：
粤北澜河变质岩主要由黑云母变粒岩和白云母绿泥片岩组成。根据主要元素、微量元素与稀土元素组成以及在各种相关判别图解上的投影，黑云母变粒岩的原岩为砂质岩，白云母绿泥片岩的原岩为泥质岩，它们主要是在被动大陆边缘的沉积环境中形成。根据黑云母变粒岩中单颗粒碎屑锆石最小U—Pb年龄为725Ma以及加里东期或早于加里东期变质的事实，原岩的沉积时间为早古生代。澜河变质岩的Sm—Nd同位素组成表明，它们的物源区为古元古代地壳，形成过程中没有年轻地壳物质加入。
英文摘要：
The Lanhe metamorphic rocks in northern Guangdong province include mainly biotite-granulitite and muscovite-chlorite-schist. Based on their main elements, trace elements and rare earth elements, the original rocks of the biotite-granulitite and muscovite-chlorite-schist were recovered to be sandstone and mudrock, respectively, which may have deposited in passive continent margin. The facts that the youngest U-Pb age （725Ma） of detritus zircons from the biotite-granulitite and that metamorphism occurred at the Caledonian or earlier than the Caledonian Period suggest that the original sedimentary rocks of metamorphic rocks may have deposited at Early paleozoic. The Sm-Nd isotope compositions of the Lanhe metamorphic rocks also indicate that the provenance for the sedimentary rocks was composed of Paleo-proterozoic crust where there was little mantle-derived juvenile crustal matter.
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