本文選題：塔里木南緣 + 古生代��； 參考：《新疆大學》2015年碩士論文

【摘要】：通過對葉城棋盤一帶分布的古生代侵入巖、火山巖系統(tǒng)的研究,從野外特征、地球化學分析及同位素年代的限定,運用各類構(gòu)造判別圖解,并結(jié)合前人研究成果,將該區(qū)古生代巖體大致分為兩種構(gòu)造成因類型:高鉀鈣堿性系列(加里東期)及堿性系列巖類(海西期),鈣堿性或高鉀鈣堿性系列巖石(128km巖體、尤侖巖體、大同西巖體、雀普河巖體、丘克蘇巖體),LREE和LILE富集,HFSE相對虧損,其中128km巖體和尤侖巖體的Sr、Nd、O同位素組成顯示幔殼混源的特點。堿性系列巖石,富堿,富HFSE,而LILE明顯虧損。早古生代構(gòu)造強烈,加里東中晚期產(chǎn)出大量造山后期花崗巖,暗示出原特提斯洋已基本封閉;早泥盆系輝綠巖脈(408.5±7.3Ma)大規(guī)模侵入,標志著加里東造山作用的結(jié)束;呈夾層狀產(chǎn)出于棋盤組(P2q)的早二疊世柱狀玄武巖(298.3±2.8Ma),代表了晚古生代又一次拉張裂解作用。研究區(qū)古生代巖漿活動總體上從拉張開放環(huán)境向擠壓閉合環(huán)境的轉(zhuǎn)變。
[Abstract]:Through the study of the Paleozoic intrusive rocks and volcanic rock systems in the Yecheng checkerboard, from the field characteristics, geochemical analysis and isotopic dating, the Paleozoic rock mass is divided into two tectonic types: high potassium calc alkaline series (Caledonian) and the previous research results. And alkaline series of rocks (Hercynian), calcium alkaline or high potassium calc alkaline series of rocks (128km rock, urun rock mass, Dutong West rock mass, Poup river rock, chksu rock mass), LREE and LILE enrichment, HFSE relative loss, of which 128km rock and urun rock mass Sr, Nd, O isomer shows the characteristics of mantle crust mixed source. Alkaline series of rocks, alkali rich, rich HFS The early Paleozoic structure is strong and the early Paleozoic structure is strong. A large number of late orogenic granites are produced in the middle and late Caledonian period, suggesting that the original Tethys ocean has been basically closed; the early Devonian diabase (408.5 + 7.3Ma) intrusions marked the end of the Caledonian orogeny, and the early Permian columnar basalt (P2q) of the chessboard group (P2q) was found in the pinch layer. 298.3 + 2.8Ma), representing the Late Palaeozoic and another tensile cracking effect, the Paleozoic magma activity in the study area changed from the open environment to the closed environment.

【學位授予單位】：新疆大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P542;P588.11

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