本文選題：塔東群 + 巖漿鋯石��； 參考：《地球科學(xué)》2017年04期

【摘要】：吉林省塔東群以含大型磁鐵礦床而著稱,塔東鐵礦是吉黑成礦省內(nèi)最大的火山噴流沉積-變質(zhì)改造型鐵礦.由于塔東群地質(zhì)特征復(fù)雜,多種地質(zhì)作用復(fù)合疊加,使其形成時(shí)代歸屬一直存在爭(zhēng)議.通過(guò)LA-ICP-MS鋯石定年,確定了吉林省塔東群黑云斜長(zhǎng)片麻巖和磁鐵透輝斜長(zhǎng)變粒巖中鋯石年代.黑云斜長(zhǎng)片麻巖中鋯石呈長(zhǎng)柱狀,Th/U值為0.17~0.65,206Pb/238U加權(quán)平均年齡為517.6±2.7Ma,代表了其原巖火山巖形成的年齡.磁鐵透輝斜長(zhǎng)變粒巖中共有兩組鋯石年齡,其中一組短柱狀,Th/U值介于0.78~1.00,加權(quán)平均年齡為249.8±4.0Ma,代表后期熱事件年齡;另一組鋯石半自形短柱狀晶形,異常高的U、Th,Th最高含量可達(dá)17 422μg/g,~(206)Pb/~(238)U加權(quán)平均年齡為518.3±3.8Ma,表示熱液活動(dòng)年齡,顯示該區(qū)518.3Ma左右經(jīng)歷了一次熱液作用,可能與該區(qū)的巖漿作用以及塔東鐵礦的成礦有關(guān).據(jù)此,塔東群內(nèi)塔東鐵礦可能存在一期早寒武世(±520Ma)的成礦作用.
[Abstract]:The Tadong Group of Jilin Province is famous for its large magnetite deposits. Tadong Iron Mine is the largest volcanic jet deposition-metamorphic iron ore deposit in Jihei metallogenic province. Due to the complex geological characteristics of the Tadong Group and the complex superposition of various geological processes, the origin of the Tadong Group has always been controversial. Based on the LA-ICP-MS zircon dating, the zircon ages of the Black-Yun plagioclase gneiss and the magnetite permeable feldspar granulite in the Tadong Group, Jilin Province, were determined. The weighted mean age of zircon in the biocline gneiss is 517.6 鹵2.7 Ma, which represents the age of volcanic formation of its original rocks. The U / U value of zircon is 0.170.65206Pb / 238U, and the average weighted age is 517.6 鹵2.7Ma. There are two groups of zircon ages in magnetite perpendicular amphiphilic granulites, one of which is short columnar Th / U value between 0.78 and 1.00, the weighted average age is 249.8 鹵4.0 Ma, which represents the later thermal event age, and the other group of zircon semiautomorphic short columnar crystals. The maximum Th content of the abnormal high UH is 17 422 渭 g / g ~ (206) Pb / 238 U weighted mean age is 518.3 鹵3.8 Ma. it indicates that the hydrothermal activity age in this area is about 518.3 Ma, which may be related to magmatism and mineralization of Tadong Iron Mine. Based on this, it is suggested that the first stage of early Cambrian (鹵520 Ma) mineralization may exist in the Neitadong Iron Mine of the Tadong Group.
【作者單位】： 吉林大學(xué)地球科學(xué)學(xué)院;哈爾濱師范大學(xué)地理科學(xué)學(xué)院;桂林理工大學(xué)地球科學(xué)學(xué)院;
【基金】：中國(guó)地質(zhì)調(diào)查局項(xiàng)目(No.1212011120329)
【分類號(hào)】：P597.3;P618.31

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