【摘要】：本文以吉林永吉地區(qū)鎂鐵—超鎂鐵巖為研究對(duì)象,依據(jù)鋯石LA-ICP-MS U-Pb定年,確定其形成時(shí)代;通過(guò)對(duì)鎂鐵—超鎂鐵巖的主、微量元素特征研究,探討其巖漿源區(qū)及形成時(shí)的構(gòu)造背景。鋯石CL圖像顯示,本文樣品中的鋯石多數(shù)呈半自形,少部分為斷柱狀,內(nèi)部結(jié)構(gòu)清晰,巖漿振蕩生長(zhǎng)環(huán)帶發(fā)育,絕大多數(shù)鋯石Th/U比大于0.1,暗示為巖漿成因鋯石。結(jié)合巖石鏡下特征和鋯石LA-ICP-MS U-Pb定年結(jié)果分析表明,頭道溝變閃長(zhǎng)巖的形成年齡為474.4±2.9Ma,小城子變輝綠巖的形成年齡為469.4士5.4 Ma,頭道溝和黑石咀地區(qū)超鎂鐵雜巖的形成時(shí)代可能為中奧陶世,表明本文研究區(qū)鎂鐵—超鎂鐵巖的形成時(shí)代為早—中奧陶世,表明吉林中部地區(qū)存在早—中奧陶世巖漿事件。.本文變質(zhì)火成巖具有相對(duì)富集大離子親石元素,如Rb、Th、U、K、Pb等,虧損Nb、Ta、Ti等高場(chǎng)強(qiáng)元素,以及弱的Eu異常的地球化學(xué)特征。超鎂鐵雜巖具有相對(duì)富集大離子親石元素,如Th、U、Pb等,虧損Sr、K、P、Ti等高場(chǎng)強(qiáng)元素,以及弱的Eu異常的地球化學(xué)特征。通過(guò)對(duì)鎂鐵—超鎂鐵雜巖巖石地球化學(xué)特征分析,結(jié)合各種構(gòu)造環(huán)境和巖漿源區(qū)圖解,頭道溝變閃長(zhǎng)巖和變輝綠巖應(yīng)為俯沖板片形成的熔體交代地幔楔部分熔融的產(chǎn)物,并存在—定的地殼混染;超鎂鐵雜巖的源區(qū)可能為虧損地幔。結(jié)合構(gòu)造環(huán)境分析,鎂鐵—超鎂鐵雜巖形成于活動(dòng)大陸邊緣的弧后盆地環(huán)境。研究區(qū)早古生代處于古亞洲洋的俯沖之下,具有活動(dòng)大陸邊緣的特點(diǎn)。
[Abstract]:In this paper, the magnesite-ultramafic rocks in Yongji area, Jilin Province, are taken as the object of study, and the age of their formation is determined according to the zircon LA-ICP-MS U-Pb dating. By studying the main and trace elements characteristics of mafic-ultramafic rocks, the magmatic source area and tectonic background of the magmatic-ultramafic rocks were discussed. The CL images of zircon show that most of the zircon in this paper are semi-autogenous, a few of them are broken columns, the internal structure is clear, the magmatic oscillatory growth ring is developed, and the Th/U ratio of most zircon is greater than 0.1, suggesting magmatic zircon. Combined with petroscopic characteristics and zircon LA-ICP-MS U-Pb dating results, it is shown that the age of formation of Toutaogou metamorphic diorite is 474.4 鹵2.9 Ma, and that of Xiaochengzi diabase is 469.4 鹵5.4 Ma,. The age of the ultramafic complex in the Toutaogou and Heishizui areas may be middle Ordovician, indicating that the mafic-ultramafic complex in this study area is early-middle Ordovician, indicating that there is an early-middle Ordovician magmatic event in the central part of Jilin Province. Metamorphosed igneous rocks have relatively rich geochemical characteristics of large ion lithophile elements, such as Rb,Th,U,K,Pb et al., depleted Nb,Ta,Ti and other high field strength elements, as well as weak Eu anomalies. The ultramafic complex is characterized by relatively rich large ion lithophile elements, such as Th,U,Pb et al., depleted Sr,K,P,Ti and other high field strength elements, as well as weak Eu anomalies. Based on the analysis of the geochemical characteristics of mafic-ultramafic complex rocks, combined with the diagrams of various tectonic environments and magmatic sources, the Toutaogou metamorphic diorite and diabase should be the product of partial melting of the melt metasomatism mantle wedge formed by subduction plate. And there are-definite crustal contamination; The source region of ultramafic complex may be depleted mantle. Combined with the analysis of tectonic environment, the mafic-ultramafic complex is formed in the back arc basin environment of the active continental margin. The study area was subducted by the Paleo-Asian Ocean in the early Paleozoic and characterized by the active continental margin.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P597.3;P588.12

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