西北地质2013，Vol.46Issue(1)：103-109,7.
青藏高原那日尼亚地区新近纪查保玛组火山岩岩石地球化学特征
Volcanic Rock Geochemistry of Neogene Check Baoma Formation in Nariniya Area,Qinghai-Tibetan Plateau
摘要
Abstract
Nariniya Pb-Zn deposits is located mainly in the Neogene volcanic rock, with obvious metallogenic layer control type. Zhabaoma group volcanic rock is one of the main ore-bearing horizons. The geochemical characteristics of the Nariniya group volcanic rocks were researched in this work. The result shows that the volcanic rock is a set of calcium alkaline- alkaline series of acidic rock assemblages with a rich alkali high potassium content. Rare earth distribution pattern is different, the light and heavy rare earth element distilled obviously. Seu is between 0. 73 and 0. 97, and there is no obvious negative europium anomaly. Trace element distribution mode is approximately consistent, for the original mantle, big ion lithophile elements (K, Ba, Rb, Sr) and Th, U etc lively incompatible elements are enriched and Zr, Ti, Ta, P high field strength elements are relatively less. Rb/Sr is 0. 07-0. 27, Rb/Sr ratio is 0. 07-0. 27, which shows the crust-mantle mixing characteristics. The rock may be from EM Ⅱ type enrichment mantlegold bearing mica mantle peridotite of partial melting, crystallization after the separation of the magma chamber rich potassium magma along the tectonic weak part in invasion, and crustal material produce mixed form mixed magma in the earth's crust shallow in place. Trace elements have high lead and zinc background value, for providing main ore-forming material sources. In the R1, R2 structure discrimination diagrams, sample mainly fall into the impact after the stretch and after collision environment. In the Rl, R2 structure discrimination diagrams, sample mainly fall into the impact after the stretch and after collision environment grams, sample mainly fall into the impact after the stretch and after collision environment.关键词
查保玛组火山岩/地球化学/那日尼亚/青藏高原Key words
Zhabaoma group volcanic rocks/ geochemical/ Nariniya/ Qinghai-Tibet plateau分类
天文与地球科学引用本文复制引用
湛守智,宋忠宝,陈海福,李连松,贾宗勇..青藏高原那日尼亚地区新近纪查保玛组火山岩岩石地球化学特征[J].西北地质,2013,46(1):103-109,7.基金项目
地质大调查"青海省岩浆岩的时空分布与成矿作用研究"项目(科[2011]02-46-02) （科[2011]02-46-02）
