Song Chay-都龍雜巖體的組成、構(gòu)造特點(diǎn)及其構(gòu)造環(huán)境
發(fā)布時(shí)間：2019-01-06 20:30
【摘要】：Song Chay-都龍地體是華南板塊的西南部最大巖漿巖雜巖體它已被認(rèn)為是代表了前寒武紀(jì)基底。Song Chay 都龍雜巖體大部分位于在越南北部，另外部分向北延入中國(guó)云南省境內(nèi)，在紅河斷裂帶與文山-河江斷裂之間。從構(gòu)造幾何形態(tài)來(lái)看SongChay 都龍雜巖體具有十分明顯的彎隆形態(tài)，東西寬度約45km,南北長(zhǎng)約80km. SongChay 都龍雜巖體組成由混合巖，花崗片麻巖和片麻巖，是一套變質(zhì)變形花崗雜巖。它遭受多階段強(qiáng)烈變形與變質(zhì)改造,其與眾不同的出露位置和出露特點(diǎn)受到眾多地質(zhì)學(xué)家們的關(guān)注。 本文從幾個(gè)方面對(duì)Song Chay 都龍雜巖體進(jìn)行觀察，開(kāi)展了深研究。SongChay-都龍兩部分的宏觀組成特點(diǎn)與構(gòu)造變形的測(cè)量和觀察從Song Chay到都龍可觀察到主要有三種巖石：1-由鉀長(zhǎng)石、斜長(zhǎng)石、條紋長(zhǎng)石組成的高溫片麻巖；2-中低溫片麻巖（花崗片麻巖）；3-白云母石英片巖（沒(méi)有出現(xiàn)長(zhǎng)石）。在花崗巖變質(zhì)巖石中主要的礦物組成為石英、鉀長(zhǎng)石、斜長(zhǎng)石和黑云母，次要礦物是角閃石、輝石、石榴石等，具有典型定向結(jié)構(gòu)。在巖石中，其中礦物具有單向定向性，石英和長(zhǎng)石單向延長(zhǎng)很強(qiáng)烈，云母集中合體定向排列，共同的特點(diǎn)是巖石被強(qiáng)烈變質(zhì)變形。在野外露頭上可容易看見(jiàn)殘斑，，殘斑具有“σ”或“δ”形狀。變形殘斑表現(xiàn)為殘斑沿著剪切方向被定向拉長(zhǎng)，可見(jiàn)十分明顯運(yùn)動(dòng)方向：長(zhǎng)石旋轉(zhuǎn)殘斑均指示上部指向東南的剪切變形。而且發(fā)育的東南-西北向的礦物拉伸線(xiàn)理。本文試圖通過(guò)了解Song Chay 都龍雜巖，其他周邊地質(zhì)構(gòu)造特點(diǎn)，以期準(zhǔn)確理解它們對(duì)Song Chay 都龍雜巖體剝露作用和意義。 在Song Chay,都龍兩部分巖石保存了不同的顯微構(gòu)造現(xiàn)象，是由變形-變質(zhì)的程度作用所致形成了不同的顯微構(gòu)造的現(xiàn)象。在Song Chay 都龍地區(qū)發(fā)育的典型顯微構(gòu)造現(xiàn)象可為：晶內(nèi)裂隙、波狀消光、機(jī)械雙晶、靜態(tài)恢復(fù)重結(jié)晶、動(dòng)態(tài)恢復(fù)重結(jié)晶、碎（殘）斑系、條帶狀構(gòu)造、S-C組構(gòu)、礦物魚(yú)和出溶構(gòu)造。在顯微構(gòu)造現(xiàn)象來(lái)表現(xiàn)出了高溫-中高溫塑性變形證據(jù)，后來(lái)疊加低溫變形改造。無(wú)論在宏觀尺度上還是顯微尺度上都反映了Song Chay 都龍雜巖體是遭受了多期變形疊加作用的結(jié)果。 Song Chay 都龍地體采用EBSD分析中石英的組構(gòu)分析獲得結(jié)果：具有3種不同應(yīng)變歷史的巖石中石英組構(gòu)圖�？梢�(jiàn)十分明顯早期是高溫，中高溫條件后期疊加低溫變形作用。 Song Chay 都龍年代學(xué)的分析，構(gòu)造活動(dòng)年齡442-402Ma代表了志留紀(jì)楊子板塊與華夏板塊陸內(nèi)碰撞造山運(yùn)動(dòng)，也是加里東構(gòu)造熱事件，主要是以S型花崗巖為主，具有上部大陸地殼相似的微量素分布形式。在中生代（印支運(yùn)動(dòng)）Song Chay 都龍地體遭受了強(qiáng)烈的構(gòu)造變形。在燕山運(yùn)動(dòng)發(fā)生大規(guī)模的巖漿侵入活動(dòng)形成老君山花崗巖。
[Abstract]:The Song Chay- Dulong terrane is the largest magmatic complex in the southwest of the South China plate. It has been considered to represent the Precambrian basement. Song Chay Tudulong complex, most of which is located in northern Vietnam, and the other part extends northward into Yunnan Province, China. Between the Honghe fault zone and the Wenshan-Hejiang fault. According to the structural geometry, the SongChay Yudulong complex has a very obvious bending shape, the width of which is about 45km from east to west, and the length from north to south is about 80km. The SongChay Gudulong complex is composed of migmatite, granitic gneiss and gneiss, which is a set of metamorphic granitic complex. It has been subjected to multiple stages of intense deformation and metamorphism, and its distinctive outburst location and characteristics have attracted many geologists' attention. In this paper, the Song Chay Dulong complex is observed from several aspects. From Song Chay to Dulong, there are mainly three kinds of rocks: (1) high-temperature gneiss composed of potassium feldspar, plagioclase and striped feldspar; Gneiss (granitic gneiss) and 3-Muscovite quartz schist (no feldspar). The main minerals in granite metamorphic rocks are quartz, potassium feldspar, plagioclase and biotite, and the secondary minerals are hornblende, pyroxene, garnet and so on. Among them, minerals have unidirectional orientation, quartz and feldspar have strong unidirectional prolongation, and mica are concentrated in orientation. The common feature is that the rocks are strongly metamorphosed. It is easy to see the speckles on the outcrop in the field, which has the shape of "蟽" or "未". The deformed speckles are shown to be elongated along the shear direction, and the movement direction is very obvious. The feldspar rotating speckles indicate the shearing deformation of the upper part pointing to the southeast. Moreover, the mineral stretching line of southeast-northwest direction is developed. In this paper, we try to understand the characteristics of Song Chay Tudulong complex and other surrounding geological structures in order to accurately understand their exfoliation and significance to the Song Chay Tudulong complex. Different microstructural phenomena have been preserved in the two parts of Song Chay, Dulong, which are caused by the degree of deformation-metamorphism. The typical microstructural phenomena developed in the Song Chay area can be as follows: intragranular fissure, wave extinction, mechanical double crystal, static recovery recrystallization, dynamic recovery recrystallization, broken (remnant) speckle system, banded structure, S-C fabric. Mineral fish and exsolution structure. The microstructural phenomena show the evidence of plastic deformation at high-middle-high temperature and then superimpose low-temperature deformation. Both macroscopic and microscopic scales reflect that the Song Chay Yudulong complex is the result of multi-stage deformation superposition. The texture analysis of quartz in EBSD analysis is used to obtain the results of the Song Chay Tudulong terrane. The results are as follows: the composition of quartz groups in rocks with three different strain histories. It can be seen that the early stage is high temperature, the late superposition of low temperature deformation under medium high temperature condition. The age of tectonic activity, 442-402Ma, represents the intracontinental collision orogeny between the Yangzi plate and the Cathaysian plate in Silurian, and is also a Caledonian tectonic thermal event, mainly of S-type granite. The distribution of trace elements is similar to that of the upper continental crust. The Mesozoic (Indosinian) Song Chay Tudulong terrane suffered a strong tectonic deformation. Large-scale magmatic intrusions occurred during the Yanshanian movement to form Laojunshan granite.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P583
本文編號(hào)：2403286
[Abstract]:The Song Chay- Dulong terrane is the largest magmatic complex in the southwest of the South China plate. It has been considered to represent the Precambrian basement. Song Chay Tudulong complex, most of which is located in northern Vietnam, and the other part extends northward into Yunnan Province, China. Between the Honghe fault zone and the Wenshan-Hejiang fault. According to the structural geometry, the SongChay Yudulong complex has a very obvious bending shape, the width of which is about 45km from east to west, and the length from north to south is about 80km. The SongChay Gudulong complex is composed of migmatite, granitic gneiss and gneiss, which is a set of metamorphic granitic complex. It has been subjected to multiple stages of intense deformation and metamorphism, and its distinctive outburst location and characteristics have attracted many geologists' attention. In this paper, the Song Chay Dulong complex is observed from several aspects. From Song Chay to Dulong, there are mainly three kinds of rocks: (1) high-temperature gneiss composed of potassium feldspar, plagioclase and striped feldspar; Gneiss (granitic gneiss) and 3-Muscovite quartz schist (no feldspar). The main minerals in granite metamorphic rocks are quartz, potassium feldspar, plagioclase and biotite, and the secondary minerals are hornblende, pyroxene, garnet and so on. Among them, minerals have unidirectional orientation, quartz and feldspar have strong unidirectional prolongation, and mica are concentrated in orientation. The common feature is that the rocks are strongly metamorphosed. It is easy to see the speckles on the outcrop in the field, which has the shape of "蟽" or "未". The deformed speckles are shown to be elongated along the shear direction, and the movement direction is very obvious. The feldspar rotating speckles indicate the shearing deformation of the upper part pointing to the southeast. Moreover, the mineral stretching line of southeast-northwest direction is developed. In this paper, we try to understand the characteristics of Song Chay Tudulong complex and other surrounding geological structures in order to accurately understand their exfoliation and significance to the Song Chay Tudulong complex. Different microstructural phenomena have been preserved in the two parts of Song Chay, Dulong, which are caused by the degree of deformation-metamorphism. The typical microstructural phenomena developed in the Song Chay area can be as follows: intragranular fissure, wave extinction, mechanical double crystal, static recovery recrystallization, dynamic recovery recrystallization, broken (remnant) speckle system, banded structure, S-C fabric. Mineral fish and exsolution structure. The microstructural phenomena show the evidence of plastic deformation at high-middle-high temperature and then superimpose low-temperature deformation. Both macroscopic and microscopic scales reflect that the Song Chay Yudulong complex is the result of multi-stage deformation superposition. The texture analysis of quartz in EBSD analysis is used to obtain the results of the Song Chay Tudulong terrane. The results are as follows: the composition of quartz groups in rocks with three different strain histories. It can be seen that the early stage is high temperature, the late superposition of low temperature deformation under medium high temperature condition. The age of tectonic activity, 442-402Ma, represents the intracontinental collision orogeny between the Yangzi plate and the Cathaysian plate in Silurian, and is also a Caledonian tectonic thermal event, mainly of S-type granite. The distribution of trace elements is similar to that of the upper continental crust. The Mesozoic (Indosinian) Song Chay Tudulong terrane suffered a strong tectonic deformation. Large-scale magmatic intrusions occurred during the Yanshanian movement to form Laojunshan granite.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P583
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