本文選題：Sn成礦作用　切入點(diǎn)：LA-ICP-MS鋯石U-Pb年齡　出處：《大地構(gòu)造與成礦學(xué)》2017年05期 　論文類型：期刊論文

【摘要】：浙西地區(qū)地處下?lián)P子陸塊東南緣,區(qū)內(nèi)中生代巖漿侵入活動(dòng)強(qiáng)烈,與成礦作用關(guān)系密切。與錫成礦作用有關(guān)的雙溪口花崗巖鋯石LA-ICP-MS U-Pb定年結(jié)果顯示,成巖年齡為130.4±1.1 Ma。巖石具有富SiO_2,高Ga、Zr、Nb和Y,貧Al_2O_3、Sr、Ba、Ti和P,Eu強(qiáng)烈負(fù)異常(δ_(Eu)=0.08~0.42)的地球化學(xué)特征,Zr飽和溫度為848~887℃,屬鋁質(zhì)A型花崗巖。鋯石Hf同位素ε_(tái)(Hf)(t)變化范圍集中在-4.66~-2.50之間,二階段模式年齡t_(DM2)變化于1192~1311 Ma之間,暗示其源區(qū)物質(zhì)主要來自中元古代地殼。結(jié)合區(qū)域地質(zhì)礦產(chǎn)資料綜合分析,認(rèn)為浙西地區(qū)與錫相關(guān)的成礦事件發(fā)生于132~127 Ma之間,受控于早白堊世伸展環(huán)境下殼幔巖漿的相互混合作用。
[Abstract]:The western Zhejiang area is located in the southeastern margin of the Lower Yangtze block. The Mesozoic magma intrusive activity in the area is strong and closely related to mineralization. The zircon LA-ICP-MS U-Pb dating results of the Shuangxikou granites related to tin mineralization show that, The diagenetic age is 130.4 鹵1.1 Ma. The geochemical characteristics of the rocks with SiO2rich, high GaO2ZrNb and Yand Al2O-poor Al2O-3Sr-Ba-ba-Ti and P-EU strong negative anomalies (未 ~ (+ +) EU ~ (+) 0.08 ~ (0.42)) indicate that the Zr saturation temperature is 848 ~ 887 鈩，

本文編號(hào)：1578621