【摘要】：昌寧-孟連帶的演化歷史一直是中外地質(zhì)學(xué)者和專家研究的熱點�！盀憸鎺r群”位于昌寧-孟連帶南段的東緣,其地層劃分、巖石特征及變質(zhì)特征,以及地質(zhì)演化等方面,仍有諸多存疑。通過對滇西鳳慶地區(qū)“瀾滄巖群”野外剖面及路線地質(zhì)調(diào)查,室內(nèi)巖石薄片研究及成分測試,經(jīng)綜合對比認為:“瀾滄巖群”的主要巖性以石榴石黑云母片巖、黑云母片巖、黑云母石英片巖、白云母片巖、千枚巖為主,其內(nèi)部夾少量經(jīng)過后期變質(zhì)變形改造的花崗質(zhì)糜棱巖和構(gòu)造片巖,有華力西-印支期的二疊紀石英閃長花崗巖脈侵入。巖石化學(xué)特征表明其原巖為長英質(zhì)巖類和富鋁泥質(zhì)巖類的沉積巖�！盀憸鎺r群”具有長期、復(fù)雜的變質(zhì)變形演化史。共分為三期變形三期變質(zhì)作用:第一期同變質(zhì)變形(D1M1)以順層擠壓作用為主,形成了尖棱-頂厚-緊閉褶皺,區(qū)域性面理S1形成;變質(zhì)較強,主要為低角閃巖相的區(qū)域動熱變質(zhì)作用。該幕變質(zhì)作用是“瀾滄巖群”片巖的主期變質(zhì)作用。形成的主要變質(zhì)礦物共生組合為:(片巖類):石榴石(Gar)+斜長石(Pl)+黑云母(Bi)+石英(Q);(千枚巖類):絹云母1(Ser)+鈉長石(Act)+石英(Q)。第二期同變質(zhì)變形(D2M2)以水平收縮作用為主,形成區(qū)域性的軸面褶劈理和滑劈理S2,變質(zhì)程度較弱主要形成低角閃巖相向綠片巖相的區(qū)域動熱退變質(zhì)作用,形成的主要變質(zhì)礦物共生組合為:(片巖類):鈉長石(Act)+白云母(Mus)+綠泥石(Chl)+石英(Q);(千枚巖類):絹云母2(Ser)+綠泥石(Chl)+石英(Q)。第三期先變形后變質(zhì)(D3M3)以基底滑脫韌性變形為主,變形具有淺-表構(gòu)造層次的特征,小型疊加褶皺和皺紋線理十分發(fā)育,剪切面理S3具有非透入性特點。變質(zhì)程度不均,斷裂帶以脆性-韌性動力變質(zhì)為主,主要形成低綠片巖相,主要變質(zhì)礦物共生組合為:絹云母3(Ser)+石英(Q)。根據(jù)區(qū)域地質(zhì)背景和構(gòu)造特征,推測“瀾滄巖群”第一期變質(zhì)變形作用發(fā)生在華力西期-印支期,昌寧-孟連洋洋殼俯沖期;第二期演化為華力西期-印支期昌寧-孟連洋洋殼俯沖完成后,岡瓦納地塊與揚子地塊陸-陸碰撞期;第三期發(fā)生在喜山期瀾滄江斷裂帶隆升,斷裂帶發(fā)生脆-韌性剪切造山運動為中。
[Abstract]:The evolutionary history of the Changning-Menglian belt has been a hot spot for geologists and experts both at home and abroad. Lancang rock group is located in the eastern margin of the southern section of Changning-Menglian belt. Its stratigraphic division, rock characteristics and metamorphic characteristics, as well as geological evolution are still doubtful. Based on the field profile and route geological investigation of Lancang rock group in Fengqing area, western Yunnan, the author considers that the main lithology of "Lancang rock group" is garnet biotite schist, through the laboratory research and composition test. Biotite quartz schist, Muscovite schist, phyllite are dominant, with a small amount of granitic mylonite and tectonic schist which were transformed by late metamorphism and deformation, and the Permian quartz diorite vein intruded in the Permian period. The petrochemical characteristics indicate that the source rocks are feldspar and aluminum-rich argillaceous sedimentary rocks. Lancang Group has a long and complicated history of metamorphic deformation and evolution. It is divided into three stages of deformation and three stages of metamorphism: the first stage of synmetamorphic deformation (D1M1) is dominated by bedding compression, resulting in the formation of sharp ridge-top thick-tight fold, regional plane S1 formation, strong metamorphism, strong metamorphism, It is mainly regional dynamic thermal metamorphism of low amphibolite facies. The metamorphism is the main metamorphism of Lancang Group schist. The main metamorphic mineral symbiotic assemblages formed are: (schist): garnet (Gar) plagioclase, (Pl) biotite, (Bi) quartz, (Q); (phyllite): sericite 1 (Ser) albite (Act) quartz (Q). The second stage of synmetamorphic deformation (D2M2) is mainly horizontal shrinkage, forming regional axial fold cleavage and slip cleavage S _ 2, and the weak metamorphism mainly forms the regional dynamic retrograde metamorphism of low-amphibolite facies to greenschist facies. The main metamorphic mineral symbiotic assemblages formed are: (schist): albite (Act) Muscovite, (Mus) chlorite, (Chl) quartz, (Q); (phyllite): sericite 2 (Ser) chlorite (Chl) quartz (Q). In the third stage, the first deformation and later metamorphism (D3M3) are dominated by the ductile deformation of the basement, which is characterized by shallow-surface tectonics, small superimposed folds and wrinkles, and shear plane S3, which is not permeable. The metamorphic degree is uneven, the fault zone is mainly brittle and ductile dynamic metamorphism, mainly forming low green schist facies, and the main metamorphic mineral symbiotic assemblage is sericite 3 (Ser) quartz (Q). According to the regional geological background and structural characteristics, it is inferred that the first stage of metamorphic deformation of Lancang Group occurred during the Varissian-Indosinian period and the subduction period of Changning Menglian oceanic crust. The second stage evolved into the continental-continental collision period between the Gondwana block and the Yangtze block after the subduction of the Changning-Menglian oceanic crust during the Varissian-Indosinian period, and the third stage occurred in the uplift of the Lancang River fault zone in the Himalayan period. The brittleness ductile shear orogeny occurred in the fault zone.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P588.3

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