摘要
塔里木盆地西南缘,新疆和田地区喀拉喀什河上游乌鲁瓦提水库库区一带新发现数条煌斑岩脉。煌斑岩脉侵位于长城纪赛拉加兹塔格岩群绢云石英片岩中,总体呈近东西向展布,主要为云斜煌岩,具典型的煌斑结构,斑晶大部分为黑云母,地球化学特征显示其具有钠质煌斑岩特征。稀土元素分配模式呈LREE/HREE富集的右倾型配分形式(LREE/HREE=4.15~6.45),基本不存在δCe异常和δEu异常,总体富集大离子亲石元素(LILE),相对亏损高场强元素(HFSE),显示了深俯冲作用引起的富集岩石圈地幔的源区特征。乌鲁瓦提煌斑岩的发现证明了该地区煌斑岩分布的集群性和类型的多样性,该地区可能仍有更具规模、更具找矿潜力的煌斑岩或者是钾镁煌斑岩有待寻找,这应当引起足够的重视。
Lamprophyre dykes were newly discovered in Ulurawati reservoir of the Hotan area,Xinjiang,the upstream of Karakash River which is located in the southwestern margin of Tarim Basin.The Lamprophyre dykes intruded into the Changchengian period Sailajiazitage group sericite schist rocks.The nearly E-W dykes are mainly composed of kersantites,which have features of high Na.The lamprophyres have typical lamprophyre texture and the phenocrysts are mainly biotites.REE distribution patterns are of the right-oblique type and the anomalies of δCe and δEu are not obvious.All samples are characterized by the enrichment of LILEs and depletion of HFSE,showing the source rock characteristics of rich lithospheric mantle controlled by the deep subduction.The discovery of Ulurawati lamprophyre suggests that the distribution of lamprophyres is gathered and the types are diversity in this area.Enough attention should be drew to that more size and more prospecting potential lamprophyres or kallites are yet to be found in this area.
作者
晁文迪
陈帅
宋志程
姜安定
CHAO Wen-di;CHEN Shuai;SONG Zhi-cheng;JIANG An-ding(Norhtwest Geological Exploration Institute of China Metallurgical Geology Bureau,Xi'an,Shaanxi 710119)
出处
《地质与勘探》
CAS
CSCD
北大核心
2018年第S01期1442-1450,共9页
Geology and Exploration
基金
中国地质调查局塔里木盆地西南缘锰多金属矿产地质调查项目(编号:DD20160003)资助。
