本文選題：石英巖 + 碎屑鋯石��； 參考：《巖石學(xué)報》2017年09期

【摘要】：基底古老地層的研究可以為探索地球早期陸殼形成與演化歷史提供重要支持,膠東地區(qū)是華北克拉通變質(zhì)基底重要的出露區(qū)之一,在膠北地體的西緣有一套高成熟度的古老石英巖-山陽村石英巖,前人將其劃歸古元古代粉子山群的小宋組,但缺乏明確的年代學(xué)限定。本文對山陽村石英巖的碎屑鋯石進行U-Pb年代學(xué)和Hf同位素分析,獲得年齡譜的最大峰值為2501±16Ma,且是最小峰值年齡。與古元古的粉子山群和中元古的芝罘群的碎屑鋯石年齡譜均不同。綜合年齡譜特征、野外產(chǎn)狀以及巖石組合,本文認(rèn)為山陽村石英巖是新太古代的巖石建造,建議為其單獨建立新太古代巖石地層單位。結(jié)合本次研究及前人工作本文認(rèn)為應(yīng)將原粉子山群小宋組劃到太古代歸屬膠東巖群。山陽村石英巖中,~2.5Ga鋯石Hf同位素εHf(t)0且從下方靠近虧損地幔演化線并在~2.7Ga地殼演化線附近分布,顯示其原巖來自~2.7Ga新生地殼的重熔;ca.2.7~3.0Ga的鋯石Hf同位素εHf(t)0且在~3.1Ga地殼演化線附近,意味著其母巖的源區(qū)為~3.1Ga的新生地殼,且在ca.2.7~3.0Ga發(fā)生了持續(xù)的地殼再熔融;3.0Ga碎屑鋯石的Hf同位素εHf(t)0,源區(qū)巖石形成于更古老陸殼物質(zhì)的再循環(huán)。已知的膠北地塊3.0Ga鋯石的Hf同位素特征暗示華北克拉通在4.1Ga前就存在地殼,而且在~4.1Ga發(fā)生了重熔。
[Abstract]:The study of the ancient basement strata can provide important support for the exploration of the formation and evolution history of the early continental crust. The Jiaodong area is one of the important outcrop areas of the North China Craton metamorphic basement. In the western margin of Jiaobei terrane, there is a set of ancient quartzite with high maturity-Shanyangcun quartzite, which was classified as Xiaosong formation of Gu Yuan ancient fangzishan group, but lack of definite chronological limitation. U-Pb geochronology and HF isotopic analysis have been performed on the detrital zircons from the quartz quartzite in Shanyangcun. The maximum peak value of the age spectrum is 2501 鹵16 Ma and the minimum peak age is obtained. The zircon age spectra of the clastic zircon are different from those of the Gu Yuan group and the Middle Proterozoic Zhifu group. Based on the characteristics of age spectrum, field occurrence and rock assemblage, it is considered that the quartz rock in Shanyangcun is a NeoArchean rock formation, and it is suggested that the NeoArchean lithostratigraphic unit be established alone. Combined with this study and previous work, it is considered that the Xiaosong formation of the Yuanfanzishan Group should be assigned to the Jiaodong Rock Group in Archean. The zircon HF isotope 蔚 Hft0 of 2.5 Ga zircon from Shanyangcun quartzite and its distribution near the depleted mantle evolution line and near the 2.7Ga crustal evolution line indicate that the source rocks originated from the remelted ca.2.7 ~ 3.0Ga zircon HF isotope 蔚 Hft0 and near the 3.1Ga crustal evolution line. It means that the source area of the source rock is the new crust of 3.1Ga, and the continuous crustal remelting occurs in the ca.2.7 ~ 3.0Ga, and the HF isotope 蔚 Hfft0 of the zircon of the 3.0Ga clastic zircon occurs. The source rocks are formed in the recirculation of the older continental crust material. The known HF isotopic characteristics of 3.0 Ga zircon from the Jiaobei block suggest that the North China Craton existed before 4.1 Ga and remelted at 4.1 Ga.
【作者單位】： 中國地質(zhì)調(diào)查局天津地質(zhì)調(diào)查中心(天津地質(zhì)礦產(chǎn)研究所);西北大學(xué)大陸動力學(xué)國家重點實驗室;
【基金】：國家自然科學(xué)青年基金項目(41602200) 國家重點研發(fā)計劃項目(2016YFC0600107-6) 中國地質(zhì)調(diào)查局地質(zhì)調(diào)查項目(121201006000150009、12120114034201) 大陸構(gòu)造與動力學(xué)國家重點實驗室開放基金(K201510)聯(lián)合資助
【分類號】：P588.341;P597

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