本文選題：年波組火山巖 + 地球化學(xué)��； 參考：《地質(zhì)論評》2017年04期

【摘要】：西藏措勤縣赤馬地區(qū)年波組火山巖大地構(gòu)造位置位于隆格爾—工布江達(dá)復(fù)合島弧帶,巖石w(SiO_2)=72.46%~81.4%;w(Al_2O_3)=11.39%~12.72%;Alk(K_2O+Na_2O)=3.33%~8.5%;w(K_2O)/w(Na_2O)=1.09~46.68;A/CNK=1.4~3.4;里特曼δ=0.27~2.15,屬過鋁質(zhì)的鉀質(zhì)、超鉀質(zhì)鈣堿性—亞堿性的中酸性火山巖。稀土總量ΣREE=118.38×10~(-6)~343.65×10~(-6);LREE/HREE=2.13~10.99;δEu=0.07~0.38,輕稀土富集,重稀土虧損,配分曲線呈右傾型,較明顯的銪負(fù)異常。富集K、Rb、LREE等大離子親石元素,而虧損Nb、P、Ti等高場強(qiáng)元素的特征,巖石顯示出島弧火山巖相似特征。鋯石U-Pb定年結(jié)果顯示,年波組火山巖成巖年齡約65~45Ma間,為古新世—始新世。年波組火山巖顯示出物質(zhì)來源主要為地殼物質(zhì)重熔和地幔物質(zhì)同化混染,由老到新,地殼物質(zhì)貢獻(xiàn)增強(qiáng)。
[Abstract]:The tectonic position of the volcanic rocks of the Nimbo formation in Chima area, Toqin County, Tibet is located in the Longgie-Gongbujiangda complex island arc belt, rock w (SiO2) 72.4646and 81.4 + 81.4. (Al2O3). It is 11.3939, and has 12.72Alk (K2O Na2O) 3.338.5w / w (Na2O) / w (Na2O), 1.0946.68A / CNK = 1.43.4; the Richter 未 0.272.15 belongs to the over-aluminous potassium, super-potassium calc-alkaline-subalkaline intermediate acid volcanic rocks. The total amount of REE is 118.38 脳 10 ~ (-6) O ~ (343.65) 脳 10 ~ (-6) ~ (-6) LREE / HREE ~ (2 +) 2.13 ~ (13) ~ (10.99), 未 EU ~ (0.07) O _ (0.38), which is enriched in light rare earths, depleted in heavy rare earths, and the partition curve is right-tilted, with obvious negative europium anomaly. The characteristics of enrichment of large ion lithophile elements, such as K RbSe, LREE, and depletion of high field strength elements, such as NbPU Ti, show that the rocks show similar characteristics of island arc volcanic rocks. The zircon U-Pb dating results show that the diagenetic age of the volcanic rocks in the Nimbo formation is about 6545 Ma, which is from Paleocene to Eocene. The volcanic rocks of the Nianbo formation show that the material sources are mainly crustal material remelting and mantle material assimilation, and from old to new, the crustal material contribution is enhanced.
【作者單位】： 成都理工大學(xué)地球科學(xué)學(xué)院;四川省地質(zhì)礦產(chǎn)勘查開發(fā)局攀西地質(zhì)隊(duì);達(dá)州市安全生產(chǎn)監(jiān)督管理局;廣西壯族自治區(qū)遙感中心;
【基金】：中國地質(zhì)調(diào)查局地質(zhì)調(diào)查項(xiàng)目(項(xiàng)目編碼:DD20160015;1212011221067)的成果~~
【分類號(hào)】：P588.14;P597.3

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