东昆仑祁漫塔格地区华力西期花岗岩地质地球化学特征  

GEOLOGICAL AND GEOCHEMICAL CHARACTERISTICS OF VARISCAN GRANITE IN THE QIMANTAGE REGION, EASTERN KUNLUN

作　　者：李光明[1] 沈远超[1] 刘铁兵[1] 

机构地区：[1]中科院地质与地球物理研究所,北京100029

出　　处：《地质与勘探》2001年第1期73-78,共6页Geology and Exploration

基　　金："九五"国家攻关 30 5项目!(96 -915 -0 1-0 6A)资助

摘　　要：通过对祁漫塔格地区华力西期花岗岩类型、空间分布、地质地球化学特征的研究表明 ,该区花岗岩分布最广的是华力西中、晚期花岗岩。华力西中期花岗岩岩石组合为钾长花岗岩、花岗岩、二长花岗岩 ,为高钾钙碱性系列 ,稀土元素含量较低 ,属轻稀土富集型 ,铕亏损较小 ,LILE中的Cs、Rb、Ba、K等含量相对富集 ,而LILE中的Sr、HFSE中Nb、Ti和P相对亏损 ,形成于碰撞后或造山晚期 ;华力西晚期花岗岩岩石组合为钾长花岗岩、花岗闪长岩、中粗粒黑云母二长花岗岩、花岗斑岩 ,为高钾钙碱性系列 ,稀土元素含量高于华力西中期花岗岩的稀土元素含量 ,铕亏损较为明显 ,微量元素以Sr、Ti和P更为亏损为特征 。The middle and late Variscan granite distributes widely in the Qimantage region, Eastern Kunlun. The geological and geochemical characteristics of the Variscan granite have been systematically studied in this article. The results indicate that the rock association of the middle Variscan granite is moyite-granite-adamellite. The rock series has K-high calc-alkaline with low content of REE, little Eu negative anomaly, rich Cs, Rb, Ba, K of LILE and depleted Sr, Nb, Ti, P. The middle Variscan granite has been generated in the post-collision or the late orogenic stage. And our work suggests that the rock association of the late Variscan is moyite-granite-adamellite-granodiorite-granite-porphyry. The rock series is K-high calc-alkaline and its middle content of REE ,with obvious Eu negative anomaly, is more than REE content of the middle Variscan granite, characterised by more depletion of Sr, Ti, P. The late Variscan granite has been generated in the transitional environment from active continental margin to post-collision.

关 键 词：花岗岩 地球化学 成因 空间分布 断裂构造 形成时代 

分 类 号：P588.121.1[天文地球—岩石学] P59[天文地球—地质学]