| 祁连山金佛寺岩体的岩石学和同位素年代学研究 |
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| 引用本文：张德全,孙桂英,徐洪林.1995.祁连山金佛寺岩体的岩石学和同位素年代学研究[J].地球学报,16(4):375-385. |
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| 基金项目:“格尔木－额济纳旗地学断面多学科综合调查研究”项目 |
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| 中文摘要:金佛寺岩体位于北祁连山区山前断裂南侧，属加里东晚期侵入体。由金佛寺花岗闪长岩－石英二长岩、大草滩二长花岗岩及干巴口二云母花岗岩３个侵入阶段的岩体组成。前两阶段岩体的全岩Ｒｂ－Ｓｒ等时线年龄分别为４１９．８７±０．４Ｍａ和４０３．７±０．０８Ｍａ。表明其侵位时代为志留纪中晚期。岩体定位以后经历了３次抬升和两次沉降。 |
| 中文关键词:岩石学和同位素年代学 金佛寺岩体 祁连山 |
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| Petrology and Isotope Chronology of the Jinfosi Pluton,Qilian Mts. ,Gansu |
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| Abstract:The Jinfosi pluton is located to the Southcast of Jiuquan(39°12′ 39°24′N, 98°30′ 99°12′E).Three intrusive stages have been recognized :the early stage (Jinfosi granodiorite-quartz mon-zonite(GQM );the middle stage of Dacaotan monzonitic granite(MG and the late stage of Gan-baou muscovite-biotite granite( MBG).The whole- rock Rb-Sr isochron age GQM is 419.87±0.4Ma and that of MG is 403.77±0.08Ma. The emplacement age is late silurian rather thanlate Devonian. The Jinfosi pluton’s ΣREE is (96.51-120.16) × 10￣6,δEu 0.67 0.77,εSr(t)+45. 8 ,and εNdt) 16.3. Its magma was derived by partial melting of the middle lower crust at adepth ranging from 30km to 36km. Since its formation ,the pluton has experienced three upliftevents(D,T,and N-Q)and two subsidence events(C and Cr.). |
| keywords:petrology isotope chronology Jinfosi pluton Qilian Mts. |
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