本文選題：鋯石U-Pb年齡　切入點(diǎn)：Hf同位素組成　出處：《地質(zhì)學(xué)報(bào)》2017年04期 　論文類型：期刊論文

【摘要】：鋯石LA-ICP-MS U-Pb定年結(jié)果顯示,休瓦促M(fèi)o-W-Cu礦床含礦花崗閃長巖的形成年齡為202±3.5Ma,形成于甘孜-理塘洋殼向西俯沖時(shí)期;含礦二長花崗巖的形成年齡為83.3±1.7Ma,形成于燕山晚期造山后伸展環(huán)境。Hf同位素原位分析結(jié)果顯示,花崗閃長巖中鋯石的ε_(tái)(Hf)(t)值為-2.87~4.12(平均為0.09),T_(MD1)年齡541~828Ma,T_(DM2)年齡為719~1109Ma,表明巖體形成的物質(zhì)來源除殼源物質(zhì)之外,也有幔源物質(zhì)的混入;二長花崗巖中鋯石的ε_(tái)(Hf)(t)值為-7.96~-2.75(平均為-5.54),T_(MD1)年齡為820~1019Ma,T_(DM2)年齡為1102~1391Ma,ε_(tái)(Hf)(t)0,表明巖石是由古老地殼物質(zhì)的部分熔融形成的產(chǎn)物。休瓦促兩期含礦巖體的鋯石U-Pb定年與Hf同位素原位分析顯示,區(qū)內(nèi)存在晚三疊世和晚白堊世兩期構(gòu)造-巖漿-成礦作用。晚三疊世花崗閃長巖巖漿侵入及Cu多金屬成礦作用與洋殼俯沖造山有關(guān);而晚白堊世二長花崗巖巖漿侵入及Mo多金屬成礦作用主要形成于陸-陸碰撞造山的構(gòu)造背景。研究表明,從晚三疊世洋殼俯沖造山至晚白堊世造山后伸展作用過程中都存在構(gòu)造-巖漿-成礦作用的發(fā)生,且在晚三疊世構(gòu)造-巖漿活動(dòng)的基礎(chǔ)上疊加了晚白堊世的成巖成礦作用,這為區(qū)內(nèi)復(fù)合疊加成礦作用的研究提供了例證。
[Abstract]:The results of zircon LA-ICP-MS U-Pb dating show that the age of the granodiorite in the Mo-W-Cu deposit is 202 鹵3.5 Ma, which was formed during the westward subduction of the Ganzi-Litang oceanic crust. The age of formation is 83.3 鹵1.7 Ma.It was formed in the post-orogenic extensional environment of late Yanshanian. The 蔚 _ S _ S _ H _ F _ (t) value of zircon from granodiorite is -2.87 ~ (4.12) (average is 0.09 ~ (?) T ~ (-1) D _ (1)) age is 541 ~ 828 Ma ~ (-1) T ~ (10 ~ (2)), which indicates that the material source of the formation of the granodiorite is 719 ~ 1109 Ma, which indicates that the material source of the rock formation is not only the crust source material, but also the mantle source material. The zircon 蔚 ~ (-1) value of zircon in the monzogranite is -7.96 ~ 2.75 (an average of -5.54 ~ (-5.54) T ~ (+) D _ (1)) age is 820 ~ 1019 Ma ~ (-1) D _ (2), 蔚 ~ (-1) ~ (-1) ~ (-1), indicating that the rocks were formed from the partial melting of the ancient crustal material, and the zircon U-Pb dating and HF isotope in situ analysis of the ore-bearing ore-bearing bodies in the Huwa-promoting period show that the zircon dating and HF isotopic analysis show that the zircon dating and HF isotopic dating of the ore-bearing rocks in the Xiwa stage are related to the formation of zircon dating and HF isotopic analysis. The late Triassic and late Cretaceous tectonic-magmatic mineralization occurred in the area. The late Triassic granodiorite magma intrusion and Cu polymetallic mineralization are related to oceanic crust subduction orogeny. The late Cretaceous magmatic intrusion and Mo polymetallic mineralization mainly occurred in the tectonic setting of continental-continental collision orogeny. From late Triassic ocean crust subduction orogeny to late Cretaceous post-orogenic extension, tectonic-magmatic mineralization occurred, and the late Cretaceous diagenesis was superimposed on the basis of late Triassic tectonic-magmatic activity. This provides an example for the study of complex superposition mineralization in the region.
【作者單位】： 昆明理工大學(xué);中國地質(zhì)調(diào)查局成都地質(zhì)調(diào)查中心;
【基金】：云南省科技領(lǐng)軍人才培養(yǎng)計(jì)劃項(xiàng)目(編號:2013HA001) 云南省教育廳基金項(xiàng)目(編號:2015Y066) 國家自然科學(xué)基金項(xiàng)目(編號:41502076) 中國地質(zhì)調(diào)查局項(xiàng)目(編號:12120114013701)資助的成果
【分類號】：P597.3;P618.2

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