本文關(guān)鍵詞： SongChay穹窿 片麻狀花崗巖 巖石地球化學(xué) LA-ICP-MS鋯石U-Pb定年 Hf同位素組成　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：為深入探討中越邊境Song Chay穹窿片麻狀花崗巖的形成、演化及找礦前景,本文對(duì)穹窿北端的麻栗坡一帶片麻狀花崗巖進(jìn)行了地球化學(xué)和年代學(xué)研究。結(jié)果表明:(1)麻栗坡一帶片麻狀花崗巖由三套酸性巖組成,分別為老城坡、南撈和團(tuán)田片麻狀花崗巖。通過它們的巖相學(xué),巖石地球化學(xué)和年代學(xué)分析對(duì)比,這些片麻狀花崗巖結(jié)構(gòu)構(gòu)造相似,地球化學(xué)特征相似,以及成巖年齡相近,唯一差別在于構(gòu)造變形程度不同,推斷這三套酸性巖很可能來自同一巖漿源區(qū)。(2)它們的Si O2含量介于69.94%~76.36%。全堿含量(K2O+Na2O)較高,變化于6.11%~8.31%。均屬于過鋁質(zhì)高鉀鈣堿性S型花崗巖。大離子親石元素Rb、K相對(duì)富集,Ba、Sr、P虧損明顯;高場(chǎng)強(qiáng)元素U、Hf相對(duì)富集,Ti、Nb虧損。球粒隕石曲線總的分布規(guī)律呈弱右傾 V‖型。這些片麻狀花崗巖總體具有S型花崗巖特征,部分?jǐn)?shù)據(jù)顯示具有I型花崗巖的特點(diǎn),表明巖漿源巖可能來自早期大部分地殼物質(zhì)混染地幔物質(zhì),經(jīng)過后期地殼增厚而部分熔融的產(chǎn)物。(3)老城坡片麻狀花崗ZK40-1b8樣品LA-ICP-MS鋯石U-Pb加權(quán)平均年齡為415.4±5.2Ma;老城坡片麻狀花崗MLP156-Q21樣品加權(quán)平均年齡為432.7±2.6Ma;團(tuán)田片麻狀花崗MPL133-Q14樣品加權(quán)平均年齡為419.8±3.2Ma,屬晚志留紀(jì)巖漿侵入的產(chǎn)物。(4)老城坡片麻狀花崗巖(MLP156-Q21)εHf(t)值變化為-4.75~-10.52,兩階段Hf模式年齡TDM2分布于1771~2094 Ma;團(tuán)田片麻狀花崗巖(MLP133-Q14)εHf(t)值變化為-12.25~10.69,兩階段Hf模式年齡TDM2分布于728~2271 Ma,表明其巖漿源區(qū)主要以元古代地殼物質(zhì)為主,成巖過程中有地幔物質(zhì)參與,屬于殼�；煸椿◢弾r。(5)麻栗坡一帶片麻狀花崗巖形成于同碰撞環(huán)境,廣西運(yùn)動(dòng)發(fā)生時(shí),云開地體與桂滇-北越地體相互作用,導(dǎo)致巖漿侵位于華南褶皺帶。
[Abstract]:In order to study the formation, evolution and prospecting prospect of Song Chay dome granitic granites on the Sino-Vietnamese border. Geochemistry and geochronology of granitic granitoids in the northern end of the dome have been carried out in this paper. The results show that the granitic granites are composed of three sets of acidic rocks, one of which is the Laocheng slope. Through their petrographic, petrogeochemical and chronological analysis and comparison, these granitic granites have similar structures, similar geochemical characteristics and similar diagenetic ages. The only difference is that the degree of tectonic deformation is different. It is inferred that these three sets of acidic rocks probably come from the same magmatic source. (2) their Sio 2 content is between 69.94 and 76.36.The total alkali content of K 2O Na 2O is relatively high. All of them belong to peraluminous high-potassium calc-alkaline S-type granites. The large ion lithophile element Rbnk is relatively enriched in Bajiu Sr-P and the depletion is obvious. The relative enrichment of high field strength element Uttria HF is depleted. The general distribution pattern of chondrites is weakly right-dip V / V type. These granitic granites are characterized by S-type granites as a whole. Some of the data show that the magmatic source rocks may come from most of the early crustal materials mixed with mantle materials. A product of partial melting through the late thickening of the crust. The U-Pb weighted age of LA-ICP-MS zircon from granitic granitic ZK40-1b8 samples from Laocheng slope is 415.4 鹵5.2 Ma. The weighted average age of Ramie granitic MLP156-Q21 samples in Laocheng slope was 432.7 鹵2.6 Ma. The weighted average age of granitic granitic MPL133-Q14 samples is 419.8 鹵3.2 Ma. It is a product of late Silurian magmatic intrusions. (4) the MLP156-Q21) 蔚 Hfttof Laichengpo granitic granitoids varies from -4.75 to 10.52. The age TDM2 of the two-stage HF model was distributed at 1771 Ma and 2094 Ma. The value of MLP133-Q14) 蔚 Hfttof granitic granitic granitoids in Tuantian is -12.2510. 69. The two-stage HF model age TDM2 was distributed at 72802271Ma. it indicates that the magma source area is mainly Proterozoic crustal material, and mantle material is involved in the diagenesis process. The granitic granitoids formed in the same collision environment in the Malipo area. When the Guangxi movement took place, the Yunkai terrane interacted with the Gui-Yunnan-North Vietnam terrane. The magma transgression is located in the South China fold belt.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P588.121;P597.3

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