本文選題：構(gòu)造變形　切入點(diǎn)：EBSD　出處：《地球科學(xué)》2017年12期

【摘要】：勸農(nóng)山地區(qū)位于長(zhǎng)春市東南部,處于佳-伊斷裂和西拉木倫河縫合帶交匯處.詳細(xì)野外調(diào)查發(fā)現(xiàn),該區(qū)曾遭受強(qiáng)烈韌性剪切變形,剪切帶內(nèi)巖石普遍糜棱巖化,主要由下二疊統(tǒng)范家屯組(P1f)鈣質(zhì)糜棱巖與侵入其中的燕山期花崗質(zhì)糜棱巖組成,變形程度處于初糜棱巖至糜棱巖之間,多具有糜棱結(jié)構(gòu).巖石應(yīng)變類型主要為壓扁型應(yīng)變,偏一般壓縮,為L(zhǎng)=S型構(gòu)造巖,指示其形成于擠壓型剪切帶的構(gòu)造環(huán)境.多種宏微觀韌性剪切變形標(biāo)志,指示明顯的左行剪切運(yùn)動(dòng).電子探針?lè)浇馐?白云石地質(zhì)溫度計(jì)、方解石和石英EBSD組構(gòu)特征、方解石e雙晶形態(tài)以及石英長(zhǎng)石變形行為等均顯示巖石具有低溫塑性流變特點(diǎn),變形環(huán)境不超過(guò)綠片巖相.剪切帶內(nèi)應(yīng)變速率偏高,應(yīng)變集中帶應(yīng)變速率最大,在10-6.95~10-8.89之間,遠(yuǎn)離強(qiáng)變形帶應(yīng)變速率在10-9.25~10-12.17之間,糜棱巖化作用過(guò)程中差異應(yīng)力下限應(yīng)大致為51.27~65.46MPa,代表剪切帶糜棱巖化作用為低溫中等強(qiáng)度應(yīng)變,在稍快的應(yīng)變速率條件下形成.壓溶擴(kuò)散和雙晶滑移為勸農(nóng)山韌性剪切帶變形初期的主要變形機(jī)制,隨著遞進(jìn)變形,逐漸以雙晶滑移和晶內(nèi)滑移為主,遞進(jìn)變形晚期,局部強(qiáng)變形域內(nèi)發(fā)生了粒間滑移.勸農(nóng)山韌性剪切帶形成與早白堊世中晚期伊澤納崎板塊NNW向高斜度斜向俯沖于歐亞大陸之下有關(guān),是佳-伊斷裂帶左旋走滑事件的局部表現(xiàn).
[Abstract]:Quannong mountain area is located in the southeast of the city in Changchun, Jiamusi and Silas Iran fault of Mulun River suture zone interchange. Found with field investigation, the district had suffered strong ductile shear deformation in the shear zone rocks generally mylonization, mainly by Jia Tun two Permian fan group (P1f) and calcareous mylonite invasion of Yanshan the composition of the granitic mylonite and protomylonite mylonite deformation degree is to, with mylonitic structure. The main rock type strain flattened strain, partial general compression, L=S type tectonic rocks formed in the tectonic environment, indicating the compressional shear zone. The ductile shear deformation of a variety of macro micro mark, indicating the left for the shearing motion obviously. Electron probe calcite dolomite geothermometry, calcite and quartz EBSD fabric characteristics, calcite and quartz feldspar morphology e twinning deformation behavior all showed that the rock has low temperature plasticity. Rheological characteristics, deformation environment does not exceed the greenschist facies. The shear band strain rate, strain rate and strain concentration zone, between 10-6.95~10-8.89, far away from the strong deformation zone of strain rate between 10-9.25~10-12.17, difference of mylonitization process should lower stress resulted from 51.27~65.46MPa, on behalf of shear band mylonitization for low temperature middle strain, at a slightly faster rate should be formed under the conditions. The main deformation mechanism of pressure solution diffusion and crystal slippage Quannong in ductile shear zone in early deformation, with progressive deformation, gradually to twin slip and intracrystal slip, progressive deformation stage, local strong deformation occurred intergranular slip domain. Quannong in ductile shear zone formation and early Cretaceous Iran zehner Zaki plate NNW to high slope in oblique subduction beneath the Eurasian continent, is good - Iran fault sinistral Affair Bureau The performance of the Department.

【作者單位】： 吉林大學(xué)地球科學(xué)學(xué)院;吉林大學(xué)東北亞礦產(chǎn)資源評(píng)價(jià)國(guó)土資源部重點(diǎn)實(shí)驗(yàn)室;北京大學(xué)地球與空間科學(xué)學(xué)院;中國(guó)地質(zhì)調(diào)查局沈陽(yáng)地質(zhì)調(diào)查中心;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(Nos.41230206,41602211)
【分類號(hào)】：P534.46;P584

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本文編號(hào)：1685596