【摘要】：西藏拿若銅(金)礦床是多龍礦集區(qū)重要礦床之一,礦體邊部存在一巖漿作用的隱爆角礫巖筒。隱爆角礫巖中存在兩種巖漿巖:一種是早期花崗閃長(zhǎng)斑巖;一種是引起隱爆作用的巖漿熱液形成的膠結(jié)物。此次工作以?xún)煞N巖漿巖為對(duì)象,研究其鋯石的Hf同位素特征�；◢忛W長(zhǎng)斑巖的鋯石~(176)Hf/~(177)Hf值介于0.282789~0.282905之間,176Lu/177Hf值介于0.000406~0.001042之間,ε_(tái)(Hf)~(t)值介于3.17~7.24之間,二階模式年齡(tDM2)為713~978Ma。膠結(jié)物鋯石的~(176)Hf/~(177)Hf介于0.282777~0.282858之間,~(176)Lu/~(177)Hf值介于0.000441~0.001572之間,ε_(tái)(Hf)~(t)值為2.69~5.54,二階模式年齡(tDM2)為823~1005M。兩期巖體的ε_(tái)(Hf)~(t)值都是較小的正值,都具有年輕二階模式年齡。拿若隱爆角礫巖中鋯石Hf同位素特征顯示,兩期巖漿均具有殼�；煸吹奶卣�。拿若礦床的形成受控于特提斯洋殼俯沖作用。
[Abstract]:The Nauro copper (gold) deposit in Tibet is one of the important deposits in the Dulong ore concentration area and there is a magmatic cryptoexplosive breccia tube at the edge of the orebody. There are two types of magmatic rocks in crypto-explosive breccia: one is the early granodiorite and the other is the cementation formed by magmatic hydrothermal solution which caused the cryptoexplosion. The HF isotopic characteristics of zircon from two magmatic rocks were studied. The zircon ~ (176) HF ~ (177H) HF value of granodiorite is between 0.282789 and 0.282905, the 蔚 _ (HF) ~ (t) value is between 3.17 and 7.24, and the second order model age (tDM2) is 713 ~ 978 Ma.The zircon ~ (176) HF value of the granodiorite is between 0.282789 and 0.282905, and the 蔚 _ (HF) ~ (t) value is between 0.000406 and 0.001042, and the second order model age (tDM2) is 713978 Ma. The ~ (176) HF ~ (177H) HF of zircon is between 0.282777 and 0.2858 ~ (176) LuP ~ (177) HF, 蔚 _ (HF) ~ (t) is between 0.000441 and 0.001572, 蔚 _ (HF) ~ (t) is 2.69 ~ 5.54, and the second order model age (tDM2) is 823 ~ 1005M. The 蔚 _ (HF) ~ (t) values of the two-stage rock mass are both small positive values and both have a younger second-order model age. The isotopic characteristics of zircon HF in Nahuo cryptoexplosive breccia show that both magma have the characteristics of crust-mantle mixing. The formation of the Naolo deposit is controlled by the Tethys oceanic crust subduction.
【作者單位】： 成都理工大學(xué)地球科學(xué)學(xué)院;中國(guó)地質(zhì)科學(xué)院礦產(chǎn)資源研究所;
【基金】：國(guó)家自然科學(xué)青年基金(41402178) 中國(guó)地質(zhì)科學(xué)院基本科研業(yè)務(wù)費(fèi)(YYWF201608) 國(guó)土資源部公益性行業(yè)科研專(zhuān)項(xiàng)項(xiàng)目(201511017;201511022-02) 青藏專(zhuān)項(xiàng)地質(zhì)調(diào)查項(xiàng)目(12120114050401) 中國(guó)地質(zhì)調(diào)查局項(xiàng)目(DD20160026) 中鋁資源西藏金龍礦業(yè)股份有限公司項(xiàng)目(XZJL-2013-JS03)聯(lián)合資助
【分類(lèi)號(hào)】：P618.41;P618.51;P588.1

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