本文關(guān)鍵詞： 巖漿巖構(gòu)造組合 構(gòu)造背景 成礦作用 二連-東烏旗 中亞造山帶　出處：《中國地質(zhì)大學(xué)(北京)》2016年博士論文　論文類型：學(xué)位論文

【摘要】：二連-東烏旗地區(qū)位于二連-賀根山構(gòu)造混雜巖帶以北,處于古亞洲域和濱太平洋域兩大構(gòu)造域的疊加交匯部位,巖漿巖分布廣泛、礦產(chǎn)資源豐富,以巖漿巖構(gòu)造組合作為探索構(gòu)造演化的“標(biāo)尺”和揭示深部過程的“探針”,對再塑該區(qū)構(gòu)造演化過程、厘定主要成礦構(gòu)造環(huán)境有重要的理論意義。集成研究區(qū)近乎全覆蓋的1:5萬區(qū)域地質(zhì)調(diào)查成果資料,編制了區(qū)域地質(zhì)圖,對巖漿巖時空分布梳理發(fā)現(xiàn),巖漿活動集中在四個時段:早古生代(470~430Ma)、晚古生代(370~260Ma)、早中生代(250~210Ma)及晚中生代(180~110Ma)。其中,巖漿活動最強烈的時代集中在330-290Ma、170-120Ma兩個時段。按上述4個時段,以侵入世代為基本單元,對巖漿巖的空間分布、組成進行了梳理,研究了各時代典型巖漿巖地球化學(xué)特征,并嘗試?yán)眉傻?:5萬區(qū)調(diào)海量數(shù)據(jù),進行全區(qū)性的地球化學(xué)對比,將研究區(qū)巖漿巖劃分為三大構(gòu)造組合:①早古生代巖漿巖構(gòu)造組合(470~430Ma):包含中奧陶世島弧巖漿組合、晚奧陶世島弧-后造山過渡環(huán)境巖漿組合及早志留世后造山巖漿組合;②晚古生代-早中生代巖漿巖構(gòu)造組合(370~210Ma):早-中泥盆世島弧(弧后)火山巖、晚泥盆世島弧背景局部伸展形成巖石組合、早石炭世大陸邊緣弧(內(nèi)弧)巖石組合、晚石炭世-早二疊世島弧擴張海陸交互相火山巖組合、晚石炭世-早二疊世后碰撞-后造山巖漿巖組合、早二疊世-中晚三疊世后造山巖石組合、晚三疊世板內(nèi)巖漿巖組合;③晚中生代巖漿巖構(gòu)造組合(180~110Ma):中晚侏羅世后碰撞-后造山巖漿巖組合、早白堊世后造山巖漿巖組合。結(jié)合區(qū)域資料得出,早古生代巖漿演化與南蒙古洋有關(guān),晚古生代-早中生代巖漿構(gòu)造組合與古亞洲洋密切相關(guān),晚中生代巖漿構(gòu)造組合與古太平洋有關(guān),后兩者間的轉(zhuǎn)換時期可能為晚三疊世。通過對已知礦床與巖漿巖時空關(guān)系的總結(jié),發(fā)現(xiàn)成礦作用集中在三個重要的巖漿演化時期:晚石炭世-早二疊世(320~270Ma),后碰撞-后造山轉(zhuǎn)換期巖漿演化,是主導(dǎo)該期鉬銅及其它多金屬成礦的根本性因素;早中生代中-晚三疊世(237Ma±),古亞洲洋閉合之后的后造山巖漿作用,形成了鐵鋅、鉛鋅銀等多金屬礦化;晚中生代早白堊世(130Ma±),古太平洋演化的后造山階段,隨巖漿演化伴發(fā)了大規(guī)模的成礦作用,是研究區(qū)最重要多金屬成礦期。
[Abstract]:Erlian-Donwuqi area is located in the north of Erlian-Hegen Mountain tectonic melange belt, and is located at the superimposed intersection of the two tectonic domains of Paleo-Asia and the riparian Pacific. The magmatic rocks are widely distributed and rich in mineral resources. The magmatic tectonic assemblage is used as the "scale" to explore the tectonic evolution and the "probe" to reveal the deep process to remodel the tectonic evolution process in this area. It is of great theoretical significance to determine the main metallogenic tectonic environment. The regional geological map has been compiled by integrating the 1: 50 000 regional geological survey results of the nearly full coverage in the study area and the temporal and spatial distribution of magmatic rocks has been combed and discovered. Magmatic activity is concentrated in four periods: early Paleozoic 470g 430Ma, late Paleozoic 370g 260Ma. The early Mesozoic (250 ~ 210 Ma) and the late Mesozoic (180-110 Ma), in which the most intense magmatic activity occurred at 330-290 Ma. According to the four periods mentioned above, the spatial distribution and composition of magmatic rocks were combed and the geochemical characteristics of typical magmatic rocks were studied according to the four periods of 170-120 Ma and taking the intrusive generation as the basic unit. And try to use the integrated 1: 50 000 regional survey massive data to carry on the whole area geochemical contrast. The magmatic rocks in the study area are divided into three major structural assemblages: Wei 1 early Paleozoic magmatic assemblage, 470U 430 Ma, including the Middle Ordovician island arc magma assemblage. Late Ordovician island arc post-orogenic transition environment magma assemblage early Silurian post-orogenic magma assemblage; (2) the late Paleozoic to early Mesozoic magmatic rock assemblages: the early and middle Devonian island arc (back-arc) volcanic rocks, and the late Devonian island arc local extension to form a rock assemblage. The early Carboniferous continental margin arc (internal arc) rock assemblage, the late Carboniferous and early Permian island arc extensional oceanic and continental intercalation volcanic rock assemblages, the late Carboniferous and early Permian post-Permian collision-post-orogenic magma assemblages. Early Permian-Middle-Late Triassic post-orogenic rock assemblage and late Triassic intraplate magmatic assemblage; (3) late Mesozoic magmatic tectonic assemblage: late Jurassic post-collision post-orogenic magmatic assemblage, early Cretaceous post-orogenic magmatic assemblage, combined with regional data. The early Paleozoic magmatic evolution is related to the Southern Mongolian Ocean, the late Paleozoic to early Mesozoic magmatic tectonic assemblages are closely related to the Paleo-Asian Ocean, and the late Mesozoic magmatic tectonic assemblages are related to the Paleo-Pacific Ocean. The transition period between the latter two may be the late Triassic. The temporal and spatial relationship between known deposits and magmatic rocks is summarized. It is found that the mineralization occurred in three important magmatic evolution periods: late Carboniferous and early Permian (320 ~ 270 Mai), post-collision and post-orogenic transition magmatic evolution. It is the fundamental factor that dominates molybdenum copper and other polymetallic mineralization in this period. During the early Mesozoic to the late Triassic, the post-orogenic magmatism after the closure of the Paleo-Asian Ocean resulted in iron-zinc, lead-zinc-silver and other polymetallic mineralization. The late Mesozoic early Cretaceous (130Ma 鹵), the post-orogenic stage of paleo-Pacific evolution, accompanied by large-scale mineralization with magmatic evolution, is the most important metallogenic period in the study area.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：P611;P588.1

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