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羌塘东部治多县啊聂托确黑云母二长花岗斑岩体特征及其构造意义
Characteristics and the Tectonic Significance of Ashetuoque Monzonite Granite-Porphyfy in the Area between Suojia and Zhiduo,the East of Qiangtang
【摘要】 啊聂托确二长花岗斑岩体,岩石类型单一,其单颗粒锆石U-Pb年龄为126±3.8Ma,形成于早白垩世。低铝(A l2O3<15%),低钛,低钠,属轻稀土元素富集型,富集大离子亲石元素K,Ba,Rb,高场强元素Th,Nb,Ta,P,略显亏损,Ti,Y较强亏损。εSr(t)为107.6~80,εNd(t)为1.9~3.1。具有壳幔混合产物的特征。构造背景为火山弧花岗岩。
【Abstract】 The type of Ashetuoque monzonite granite-porphyfy is simple,and the value of single zircon U-Pb dating method is 126+3.8Ma.It is formed in early Cretaceous and it belonged to light rare earth element enrich type,lower Al(<15%),Ti,Na.It enriches large ion lithophile element K,Ba,Rb,high field strength element Th.The Nb,Ta,P have a little depletion,Ti,Y have much depletion.εSr(t) is 107.6~80,εNd(t) is 1.9~3.1.The character of monzonite granite-porphyfy is the mix product of crust and mantle.The tectonic setting is granite in volcanic arc.
【Key words】 the east of Qiangtang； Suojia； monzonite granite-porphyfy； tectonic significance；
- 【文献出处】 华南地质与矿产 ,Geology and Mineral Resources of South China , 编辑部邮箱 ,2006年03期
- 【分类号】P588.121
- 【被引频次】3
- 【下载频次】135