本文選題：中生代巖漿作用　切入點(diǎn)：格架　出處：《地質(zhì)學(xué)報(bào)》2017年01期

【摘要】：山東膠東地區(qū)中生代構(gòu)造-巖漿事件和金礦成礦作用密切相關(guān),其主要構(gòu)造-巖漿事件包括:1220~200 Ma,揚(yáng)子板塊相對(duì)華北板塊的南北向碰撞形成蘇魯高壓-超高壓變質(zhì)帶及同造山花崗巖與造山后高堿正長巖,屬于典型的幔源型花崗巖系列;2 165~150 Ma,晚侏羅世時(shí)期形成與金礦有關(guān)的玲瓏(昆崳山)造山早期片麻狀二長花崗巖組合,為過鋁質(zhì)花崗巖類,屬膠東基底巖系的部分重熔產(chǎn)物。3 135~110 Ma,由殼�；旌蠋r漿結(jié)晶分異形成郭家?guī)X花崗巖和偉德山花崗閃長巖。燕山期是膠東地區(qū)巖漿活動(dòng)的鼎盛時(shí)期,表現(xiàn)為四次強(qiáng)烈的構(gòu)造-巖漿事件,代表了燕山造山事件四個(gè)構(gòu)造幕,并以擠壓與伸展相互轉(zhuǎn)化為特征。研究表明膠東地區(qū)中生代花崗巖具有繼承性和再生性特點(diǎn),采自郭家?guī)X花崗閃長巖中的SHRIMP鋯石U-Pb同位素年代學(xué)測(cè)定結(jié)果表明:鋯石由核部到邊部年齡值分別為2573~2194Ma、164.8~147.8和126.6~126.2Ma,顯示了膠東結(jié)晶基底、玲瓏花崗巖和郭家?guī)X花崗巖形成的年代學(xué)信息,揭示了它們之間復(fù)雜的繼承性和再生性,即新太古代膠東巖群、TTG巖系和古元古代荊山群、粉子山群等膠東基底巖系交代重熔形成S型玲瓏花崗巖,由殼幔混合巖漿形成的郭家?guī)X花崗巖在形成與侵位過程中重熔交代了部分玲瓏花崗巖物質(zhì)并侵位于玲瓏花崗巖中。分析認(rèn)為2573.4~2194.4 Ma是膠東結(jié)晶基底的年齡信息,164.8~147.8Ma代表了玲瓏花崗巖形成的年齡信息,126.2~126.6Ma則代表了郭家?guī)X花崗巖形成的年齡信息。這種年齡信息組合也反映了膠東地區(qū)從新太古代陸塊形成、古元古代克拉通化到三疊紀(jì)華北陸塊與揚(yáng)子陸塊碰撞至玲瓏S型花崗巖形成、郭家?guī)X殼�；旌闲突◢弾r形成演化的年代學(xué)記錄,濃縮了膠東地區(qū)中生代巖漿起源和演化的過程,進(jìn)而為詮釋膠東地區(qū)深部巖漿作用過程提供了新的資料,并對(duì)后續(xù)的相關(guān)科學(xué)研究尤其是金礦的多期成礦作用提供了佐證。
[Abstract]:Mesozoic tectonic-magmatic events are closely related to gold mineralization in Shandong Jiaodong area. The main tectonic-magmatic events include: 1220m 200 Ma.The Yangtze plate collided with the North China plate to form the Sulu high-pressure high-pressure metamorphic belt and synorogenic granite and post-orogenic high-alkali syenite. It belongs to a typical mantle-derived granitoid series of 2165U 150 Ma.The Linglong (Kunyu) orogenic early orogenic granitic granitic assemblage was formed during the late Jurassic, which is peraluminous granitic. Part of the remelting product of the Jiaodong basement rock series was 3.135 ~ (10) Ma, which formed the Guojialing granite and the Weideshan granodiorite from the crystallization differentiation of the crust and mantle mixed magma. The Yanshanian period was the peak of magmatic activity in the Jiaodong area, the Yanshanian period was the peak of magmatic activity in Jiaodong area. Four strong tectonic-magmatic events, representing the four tectonic episodes of Yanshanian orogenic event and characterized by the mutual transformation of compressions and extensions, show that the Mesozoic granites in Jiaodong area are inherited and regenerated. The SHRIMP zircon dating from the granodiorite of Guojialing shows that the ages of zircon from the core to the edge are 2573 ~ 2194 Ma ~ 164.8 ~ 147.8 and 126.6 ~ 126.2 Ma, respectively, indicating the geochronological information of the crystalline basement, Linglong granite and Guojialing granite in Jiaodong. It is revealed that the complex inheritance and regeneration between them, that is, the TTG rock series of NeoArchean Jiaodong rock group and the Jingshan Group of Paleoproterozoic, the metasomatic remelting of the strata of Jiaodong basement, such as the Fangzishan Group, formed S-type Linglong granite. The Guojialing granite formed by the mixed magma of crust and mantle remelted part of the Linglong granite material during the formation and emplacement process and was located in the Linglong granite. It is considered that 2573.4. 4 and 2194.4 Ma is the age information of Jiaodong crystalline basement of 164.8147.8 Ma. The age information of Linglong granite is 126.2and 126.6 Ma, which represents the age information of Guojialing granite formation. This age information combination also reflects the formation of NeoArchean continental blocks in Jiaodong area. Paleoproterozoic cratonization to Triassic collision of North China block and Yangtze block to the formation of Linglong S-type granite, and the chronological record of formation and evolution of Guojialing crust-mantle mixed type granite, have concentrated the process of origin and evolution of Mesozoic magma in Jiaodong area. It provides new data for the interpretation of the deep magmatism process in Jiaodong area, and provides evidence for the subsequent scientific research, especially for the multi-stage mineralization of gold deposits.
【作者單位】： 山東省地質(zhì)科學(xué)研究院國土資源部金礦成礦地質(zhì)過程與資源利用重點(diǎn)實(shí)驗(yàn)室山東省金屬礦產(chǎn)成礦地質(zhì)過程與資源利用重點(diǎn)實(shí)驗(yàn)室;
【基金】：山東省招遠(yuǎn)-萊州地區(qū)金礦成礦地質(zhì)條件及成礦規(guī)律研究(2012028) 山東省泰山學(xué)者建設(shè)工程專項(xiàng)經(jīng)費(fèi)聯(lián)合資助
【分類號(hào)】：P597.3;P588.1;P618.51

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