富集性和亏损性A型花岗岩(以华北燕山和新疆乌伦古河地区岩石为例)

华北燕山地区和新疆乌伦古河地区发育有过碱性A型花岗岩类。前者出现于板内，富Nb、低εNb而高εSr；后者形成于造山晚期，贫Nb、高εNd而低εSr。总结了它们的地质学、岩石学、主要和痕量元素地球化学资料，报道了Rb-Sr和 Sm-Nd同位素分析结果；以此为基础探讨了这类岩石的物质来源及其亚类划分问题；提出两类岩石分别来源于富集性储库与亏损性储库的看法。

A-Type Granites with the Character of Enrichment and Loss with Particular Reference to Both Suites of the Yanshan,North China and Wulunguhe,Northwest China

Two suites of A-type granites with the character of alkaline-oversaturation are discovered in both of the Yanshan region, East China and the Wulunguhe region, the Xinjiang Uygur autonomous region. The Yanshan's A-type suite occurs in sitting of within-plate in tectonic, with character of Poor Nb, low εNd(T) and high εSr(T), the Wulunguhe's one are distributed over a late-organic sitting, being poor Nb, high εNd(T) and low εSr(T). Geology, petrology and data of major-trace-elements for the granites are summed, analysis results of Sm-Nd and Rb-Sr isotope are reported, derived-materials and subdivision for them are discussed in the paper. Two kinds of sources of derived-material, that one is enriched but another is lost, are implicated by these data for the A-type granites of both regions of the Yanshan and the Wulunguhe.