摘要
在藏北高原玛尔盖茶卡幅1：25万区调过程中，对新疆云雾岭花岗岩进行了地质、地球化学综合研究，结果表明，该岩体具高SiO2，富碱的特征，岩石组合为二长花岗岩和巨斑状二长花岗岩，岩相间为涌动型侵入接触关系．岩石为高钾钙碱性系列，A／CNK≤1，为次铝质花岗岩．稀土含量较高，属于轻稀土富集型，δEu值在0．19—0．34之间，Eu亏损明显．微量元素中以K、Rb、Th富集为显著特点．通过对该岩体单矿物锆石U-Pb法年龄测定，其形成时代为早侏罗世（201．8—203．4Ma），为I-S过渡型，形成于同碰撞构造环境.
The North Tibet Plateau 1：250,000 regional survey of the Maergaicaka sheet covers the geology and geochemistry of the period granite in the Yunwuride Xinjiang plateau. Results of a systematic study indicate the granite is high-SiO2 and alkali-rich with a monzonitic granite and porphyry monzonitic granite composition and gushing intrusive contact relationships. The rock series is K-high calc-alkaline with A/CNK≤1, a subaluminous granite with higher REE content, rich LREE, anomalous Eu （δ Eu=0.19-0.34） and high contents of Rb, K and Th. Single-zircon U-Pb dating suggests the granite-porphyry is early Jurassic.,The granite belongs to I-S-type and was generated in a syn-collisional environment.
出处
《新疆地质》
CAS
CSCD
2006年第3期223-228,共6页
Xinjiang Geology
基金
西藏1:25万玛尔盖茶卡幅(I45C001002)区域地质调查项目资助
关键词
藏北高原
云雾岭
花岗岩
地球化学
成因类型
North Tibet Plateau
Yunwuride period
monzonitic granite
porphyry monzonitic granite
geochemistry
genesis type
