西藏拿若隐爆角砾岩中岩浆岩成因:来自锆石Hf同位素证据
发布时间：2018-07-13 14:05
【摘要】：西藏拿若铜(金)矿床是多龙矿集区重要矿床之一,矿体边部存在一岩浆作用的隐爆角砾岩筒。隐爆角砾岩中存在两种岩浆岩:一种是早期花岗闪长斑岩;一种是引起隐爆作用的岩浆热液形成的胶结物。此次工作以两种岩浆岩为对象,研究其锆石的Hf同位素特征。花岗闪长斑岩的锆石~(176)Hf/~(177)Hf值介于0.282789~0.282905之间,176Lu/177Hf值介于0.000406~0.001042之间,ε_(Hf)~(t)值介于3.17~7.24之间,二阶模式年龄(tDM2)为713~978Ma。胶结物锆石的~(176)Hf/~(177)Hf介于0.282777~0.282858之间,~(176)Lu/~(177)Hf值介于0.000441~0.001572之间,ε_(Hf)~(t)值为2.69~5.54,二阶模式年龄(tDM2)为823~1005M。两期岩体的ε_(Hf)~(t)值都是较小的正值,都具有年轻二阶模式年龄。拿若隐爆角砾岩中锆石Hf同位素特征显示,两期岩浆均具有壳幔混源的特征。拿若矿床的形成受控于特提斯洋壳俯冲作用。
[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.
【作者单位】： 成都理工大学地球科学学院;中国地质科学院矿产资源研究所;
【基金】：国家自然科学青年基金(41402178) 中国地质科学院基本科研业务费(YYWF201608) 国土资源部公益性行业科研专项项目(201511017;201511022-02) 青藏专项地质调查项目(12120114050401) 中国地质调查局项目(DD20160026) 中铝资源西藏金龙矿业股份有限公司项目(XZJL-2013-JS03)联合资助
【分类号】：P618.41;P618.51;P588.1
[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.
【作者单位】： 成都理工大学地球科学学院;中国地质科学院矿产资源研究所;
【基金】：国家自然科学青年基金(41402178) 中国地质科学院基本科研业务费(YYWF201608) 国土资源部公益性行业科研专项项目(201511017;201511022-02) 青藏专项地质调查项目(12120114050401) 中国地质调查局项目(DD20160026) 中铝资源西藏金龙矿业股份有限公司项目(XZJL-2013-JS03)联合资助
【分类号】：P618.41;P618.51;P588.1
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