| 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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| 关键词:petrology isotope chronology Jinfosi pluton Qilian Mts. |
| 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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| Petrology and Isotope Chronology of the Jinfosi Pluton,Qilian Mts. ,Gansu |
| 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.). |
| ZHANG De-quan,SUN Gui-ying,XU Hong-lin.1995.Petrology and Isotope Chronology of the Jinfosi Pluton,Qilian Mts. ,Gansu[J].Acta Geoscientica Sinica,16(4):375-385. |
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