本文關(guān)鍵詞：保山—鎮(zhèn)康地塊及鄰區(qū)早古生代地質(zhì)特征及特提斯構(gòu)造演化　出處：《中國地質(zhì)大學(北京)》2016年博士論文　論文類型：學位論文

  更多相關(guān)文章： 保山-鎮(zhèn)康地塊 特提斯 早古生代 被動大陸邊緣 構(gòu)造演化

【摘要】：保山—鎮(zhèn)康地塊位于三江特提斯構(gòu)造帶西南部,夾持在潞西—三臺山結(jié)合帶與昌寧-孟連結(jié)合帶相接之間,是研究特提斯演化關(guān)鍵地區(qū)。該區(qū)也是我國著名的鉛鋅銅金礦集區(qū),被列入國家整裝勘查區(qū)。保山—鎮(zhèn)康地塊及鄰區(qū)的時空結(jié)構(gòu)和演化對于中國大地構(gòu)造分區(qū)、多金屬找礦以及特提斯研究等具有重要的地質(zhì)意義。前人對該區(qū)研究主要側(cè)重于晚古生代古生物、沉積古地理及巖漿巖演化等方面,研究區(qū)早古生代地質(zhì)記錄保存相對少且后期變質(zhì)變形疊加影響強烈,研究程度相對較低。本論文以保山—鎮(zhèn)康地塊及鄰區(qū)為研究對象,探討早古生代地質(zhì)特征及構(gòu)造演化具有重要的理論和實際意義。本論文以板塊構(gòu)造理論和大陸動力學思想為指導,運用盆地分析和構(gòu)造解析理論和方法,將沉積-巖漿-構(gòu)造-年代學緊密結(jié)合,以承擔的“云南大理至瑞麗基礎(chǔ)地質(zhì)綜合調(diào)查”等項目為依托,綜合22幅1:5萬區(qū)調(diào)新資料,系統(tǒng)研究了保山—鎮(zhèn)康地塊及鄰區(qū)早古生代地質(zhì)特征及構(gòu)造演化。通過沉積地層系統(tǒng)研究認為保山—鎮(zhèn)康地塊早古生代為西北澳大利亞岡瓦納被動大陸邊緣盆地的一部分,新元古代末至中寒武世呈現(xiàn)“中間地壘兩側(cè)地塹”古地理格局;晚寒武世至早奧陶世裂谷活動發(fā)育,“塹、壘”古地理格局差異明顯;中奧陶世晚期至志留紀保山-鎮(zhèn)康地塊東緣發(fā)育單斜地塹盆地,演變?yōu)椤拔髋_、東塹”構(gòu)造古地理格局。新發(fā)現(xiàn)的蛇綠巖地球化學及同位素年代學研究認為,昌寧—孟連原特提斯大洋至少于早古生代早期已開始發(fā)育,經(jīng)與龍木錯—雙湖結(jié)合帶奧陶紀堆晶巖的對比研究,證實龍木錯—雙湖—怒江—昌寧—孟連是分隔泛華夏與岡瓦納大陸的古特提斯大洋最終消亡的巨型結(jié)合帶,形成時代從早古生代持續(xù)到中三疊世。研究區(qū)巖漿巖巖石學、地球化學及同位素年代學系統(tǒng)研究結(jié)果表明,中奧陶世昌寧-孟連洋由擴張轉(zhuǎn)為向東俯沖消減,形成了早古生代中晚期西南三江陸緣弧盆系構(gòu)造格局。在探討了研究區(qū)區(qū)域構(gòu)造演化基礎(chǔ)上,提出了新元古代末至中寒武世昌寧-孟連原特提斯大洋開始擴張及岡瓦納大陸北緣被動大陸邊緣盆地發(fā)育、晚寒武世至早奧陶世昌寧-孟連洋向兩側(cè)快速擴張及岡瓦納大陸北緣被動大陸邊緣裂谷盆地發(fā)育、中奧陶世至志留紀昌寧-孟連洋向東俯沖消減形成西南三江陸緣弧盆系及岡瓦納大陸北緣轉(zhuǎn)變?yōu)楸粍哟箨戇吘壟璧厝齻�階段構(gòu)造演化模式。
[Abstract]:Sanjiang is located in the Tethys tectonic zone in the southwest of Baoshan - Zhenkang block, held in Taishan with three Luxi and Changning Menglian belt is connected between the key areas of Tethyan evolution research. This area is also a famous collection area of lead, zinc and copper gold in China and is included in the national rectification and exploration area. The space-time structure and evolution of Baoshan Zhenkang massif and its adjacent areas have important geological significance for tectono zoning, polymetallic prospecting and Tethys research in China. Previous studies focused on Late Palaeozoic paleontology, sedimentary palaeogeography and magmatic rock evolution. The early Paleozoic geological records in the study area are relatively less preserved, and the influence of late metamorphic deformation and superposition is strong, and the degree of research is relatively low. This paper takes the Baoshan Zhenkang block and its adjacent area as the research object, and discusses the important theoretical and practical significance of the geological characteristics and tectonic evolution of the early Paleozoic. In this paper, the theory of plate tectonics and continental dynamics theory, the use of basin analysis and structural analysis theory and method, combining the sedimentary magmatic tectonic chronology, taking "Yunnan Dali to Ruili based comprehensive geological survey" project, a comprehensive 22 1:5 000 regional geological data, system research the Baoshan - Zhenkang block and adjacent areas in Early Paleozoic geological characteristics and tectonic evolution. Through the study of sedimentary strata system that Baoshan - Zhenkang block to the northwest of Australia early Paleozoic Gondwana passive continental margin basin is a part of the late Neoproterozoic to Cambrian middle Horst graben shows the paleogeographic pattern on both sides "; the late Cambrian to early Ordovician rift development activities," Qian, Lei "paleogeographic pattern the difference is obvious; in the Ordovician to Silurian in Baoshan - the eastern margin of Zhenkang massif development monoclinic graben basin evolved into the western Taiwan, East graben tectonic palaeogeography pattern. The newly discovered ophiolite, geochemistry and isotope geochronology that Changning-Menglian original Tethys ocean to less than early Paleozoic era has begun to develop, with the Longmucuo Shuanghu - combined with the comparative study with the Ordovician cumulates, confirmed the Longmucuo Shuanghu - - Nu River - ning Chang Menglian is separated with the pan Cathaysian giant the palaeotethys ocean between Gondwana and the final demise of the band, formed from early Paleozoic era until three triassic. The study area magmatite petrological and geochemical and isotopic geochronology study results show that the Middle Ordovician Changning - by Meng Lianyang expansion to the eastward subduction of the early Paleozoic, late formation in southwest Sanjiang continental margin arc basin system structure. In the study area was discussed on the basis of regional tectonic evolution, the late Neoproterozoic to Cambrian Changning Meng Lianyuan Tethys ocean began to expand and the passive continental margin of the northern margin of Gondwana basin, late Cambrian to early Ordovician Changning - Meng Lianyang to the rapid expansion of both sides and the northern margin of Gondwana passive continental margin rift Middle Ordovician to Silurian Changning Meng Lianyang eastward subduction of the continental margin arc formed southwest of Sanjiang basin and the northern margin of Gondwana into a passive continental margin basin three stages of tectonic evolution pattern.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：博士
【學位授予年份】：2016
【分類號】：P534.4;P548

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