本文關(guān)鍵詞： 長樂—詔安構(gòu)造帶 構(gòu)造片理 鋯石U-Pb測年 中生代 構(gòu)造應(yīng)力場　出處：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：長樂—詔構(gòu)造帶位于福建沿海,歷史上曾在構(gòu)造帶內(nèi)部及周邊發(fā)生過多次強(qiáng)烈地震。但是,對該構(gòu)造帶的認(rèn)識仍眾說紛紜。福建沿海是我國經(jīng)濟(jì)發(fā)展的前沿地帶,是實施海洋戰(zhàn)略的出發(fā)點。本文選取長樂—詔安構(gòu)造帶北段(即福州—莆田段)為研究對象,系統(tǒng)追索調(diào)查了北段的構(gòu)造變形、測量了大量的片理化帶產(chǎn)狀,并進(jìn)行了相關(guān)樣品的采集。通過對野外資料的分析整理、樣品的分析測試,并結(jié)合區(qū)域地質(zhì)資料和前人研究成果,較為系統(tǒng)地研究了該構(gòu)造帶北段的構(gòu)造變形特征、新構(gòu)造活動特征、構(gòu)造年代學(xué)、構(gòu)造應(yīng)力場及構(gòu)造演化。長樂-詔安構(gòu)造帶北段的總體構(gòu)造變形特點主要表現(xiàn)為寬達(dá)數(shù)十公里的強(qiáng)烈構(gòu)造片理(劈理)化帶;相關(guān)的巖石一般都表現(xiàn)出了不同程度的顯微構(gòu)造變形特征;表明主要為中等構(gòu)造層次形成的變形構(gòu)造與弱動力變質(zhì)巖。沿構(gòu)造片理化帶發(fā)育大致同期的基性巖墻群;并在該區(qū)首次發(fā)現(xiàn)假玄武熔巖的共生現(xiàn)象。該構(gòu)造帶的新構(gòu)造期斷層較弱;地表未見規(guī)模大、活動強(qiáng)、位移顯著的活動斷裂帶標(biāo)志;其歷史強(qiáng)震活動水平并不高;推測并不是一條活動的深大斷裂帶。構(gòu)造帶的年代學(xué)研究表明,主體構(gòu)造變形(北東向構(gòu)造片理化帶)是與中生代中-晚期的巖漿活動和變質(zhì)作用同期的,其形成過程可大致分為三個階段:(1)中侏羅世-晚侏羅世早期、(2)晚侏羅世末-早白堊世早期、(3)早白堊世晚期,其中最主要的形成階段為晚侏羅世末-早白堊世早期。本文在早白堊世基性巖墻群的鋯石測年中發(fā)現(xiàn)了12個古元古代—中元古代的年齡值(1400~2500Ma)、5個新元古代的年齡值(800~1400Ma)及4個晚古生代的年齡值(250~400Ma);它們可能反映了深部基底不同時代的原巖信息;推測該帶可能存在“華夏古陸”基底及加里東褶皺帶與晚古生代沉積蓋層。根據(jù)“構(gòu)造片理化”帶的統(tǒng)計分析可劃分出兩期古構(gòu)造應(yīng)力場,分別主要對應(yīng)于北東向和北西向構(gòu)造片理化帶的發(fā)育時期;前者主壓應(yīng)力方向為南東-北西向,是中、晚侏羅世到早白堊世的主體構(gòu)造形成期;后者主壓應(yīng)力方向為南西-北東向,主要作用于晚白堊世。
[Abstract]:The Changle-Zhao structural belt is located along the coast of Fujian. There have been many strong earthquakes in and around the tectonic belt in history. The understanding of the tectonic belt is still divided. Fujian coastal area is the frontier of economic development in China. In this paper, the north segment of the Changle-Zhaoan structural belt (Fuzhou-Putian section) is selected as the research object, the structural deformation of the northern segment is investigated systematically, and a large number of sheet physical-chemical belt occurrence is measured. Through the analysis of field data, sample analysis and test, combined with regional geological data and previous research results. The characteristics of tectonic deformation, neotectonic activity and tectonic chronology in the northern segment of the tectonic belt are systematically studied. Tectonic stress field and tectonic evolution. The general structural deformation characteristics of the northern segment of the Changle-Zhaoan tectonic belt are mainly characterized by a strong tectonic lithocline (cleavage) belt with a width of tens of kilometers. The related rocks generally show different microstructural deformation characteristics. It shows that the deformation structure and weakly dynamic metamorphic rock are mainly formed at the middle tectonic level. The symbiotic phenomenon of pseudo-#china_person0# lava was found for the first time in this area. There is no sign of active fault zone with large scale, strong activity and significant displacement on the surface of the earth. Its historical strong earthquake activity level is not high; The chronological study of the tectonic belt indicates that the main tectonic deformation (NE tectonic sheet physical and chemical belt) is in the same period with the late Mesozoic magmatic activity and metamorphism. The formation process can be roughly divided into three stages: 1) Middle Jurassic to early late Jurassic, 2) late Jurassic to early Cretaceous, 3) late early Cretaceous. The most important stage of formation was the late Jurassic to early Cretaceous. In the zircon dating of the early Cretaceous basic rock dike group, 12 ages of Gu Yuan from ancient to middle Proterozoic were found in this paper. 1400V 2500Ma). Five Neoproterozoic ages (800 ~ 1400Ma) and four late Paleozoic ages (250 ~ 400MaA); They may reflect the original rock information of different ages of deep basement. It is inferred that there may be "Cathaysian paleocontinent" basement, Caledonian fold belt and late Paleozoic sedimentary caprock. According to the statistical analysis of the "tectonic sheet physicochemical" zone, the paleotectonic stress fields can be divided into two periods. It mainly corresponds to the developing period of the physical and chemical belts in the NE and NW directions, respectively. The main compressive stress of the former is in the direction of S E N W, which is the main tectonic formation period from the middle and late Jurassic to the early Cretaceous. The main compressive stress of the latter is in the direction of NW-NE, mainly in late Cretaceous.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P548

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