內(nèi)蒙古烏拉特中旗新忽熱地區(qū)二疊紀(jì)典型侵入巖地球化學(xué)特征及成因探討
發(fā)布時間：2018-07-18 13:21
【摘要】：研究區(qū)位于華北克拉通北緣中段,距其北部的索倫縫合帶約100km左右,區(qū)內(nèi)中-晚古生代巖漿活動強烈,這些巖漿活動不僅能為區(qū)域構(gòu)造的演化提供時間制約,而且是研究匯聚大陸邊緣殼-幔相互作用和大陸地殼演化的重要載體,因此本次研究選取了區(qū)內(nèi)二疊紀(jì)的典型巖體作為研究對象,通過對這些典型巖體開展詳細的巖石學(xué)、地球化學(xué)、同位素地質(zhì)學(xué)和年代學(xué)等方面的研究,厘定了研究區(qū)內(nèi)典型巖體的侵位時代、探討了各個巖體的地球化學(xué)特征、揭示了巖漿成因及構(gòu)造背景,取得的主要認識如下:(1)獲得烏毫來巖體的邊緣相輝長閃長巖的LA-ICP-MS鋯石U-Pb年齡為265.9±2.4Ma,結(jié)合前人資料認為,該區(qū)二疊紀(jì)巖體的侵位順序依次為大烏淀巖體(~290Ma)、趙根陶拉巖體(~275Ma)、烏毫來巖體(265.9Ma)、哈尼河巖體(265.9Ma)。(2)大烏淀巖體和趙根陶拉巖體具有準(zhǔn)鋁質(zhì)-弱過鋁質(zhì)的特征,均為高鉀鈣堿性I型花崗巖,在微量、稀土元素組成上,輕重稀土元素分異較明顯,明顯富集K、Rb、Ba等大離子親石元素,虧損Nb、Ta、Ti、P等高場強元素的特征,具有弧巖漿巖的性質(zhì)。烏毫來巖體具有較高的Mg#值(0.50~0.72),稀土元素含量較低,富集V、Cr、Ni等相容元素,富集K、Sr、Ba等大離子親石元素(LILE),虧損Nb、Ta等高場強元素(HFSE),與被俯沖流體交代的富集巖石圈地幔的部分熔融密切相關(guān)。哈尼河巖體具有高硅、高鉀、過鋁質(zhì)的特征,具有S型花崗巖的特征,輕重稀土元素分異較強,同樣強烈富集大離子親石元素,虧損高場強元素,富集Th、U,具有殼源巖漿巖的性質(zhì)。(3)大烏淀巖體、趙根陶拉巖體和烏毫來巖體具有比較相似的Sr-Nd同位素組成,在(~(87)Sr/~(86)Sr)_i-ε_(Nd)(t)圖解中均投點于地幔演化序列的左下方和下地殼演化線的上方,具有殼幔巖漿混合的特征,通過殼幔巖漿二元混合模型計算表明,大烏淀巖體是俯沖板片熔體與下地殼熔體混合成因,趙根陶拉巖體和烏毫來巖體則是俯沖流體交代的富集巖石圈地幔部分熔融熔體與下地殼熔體發(fā)生混合的產(chǎn)物。而哈尼河巖體具有非常高的(~(87)Sr/~(86)Sr)i比值(0.732355~0.740484)和很低的εNd(t)值(-34.59~-36.60),與中-下地殼同位素組成相似,暗示巖漿可能起源于中-下地殼。(4)根據(jù)巖體的地球化學(xué)特征,結(jié)合前人研究成果,認為大烏淀巖體形成于活動大陸邊緣環(huán)境,是古亞洲洋向華北克拉通北緣俯沖作用的產(chǎn)物;趙根陶拉巖體和烏毫來巖體形成于同碰撞向后碰撞轉(zhuǎn)變的過渡環(huán)境,兩個巖體可能均是由板片斷離作用導(dǎo)致軟流圈物質(zhì)上涌誘發(fā)上部富集巖石圈地幔發(fā)生部分熔融,然后與下地殼熔體發(fā)生不同程度的混染之后,先后上升侵位形成;哈尼河巖體形成于后碰撞環(huán)境,是地殼加厚導(dǎo)致中-下地殼物質(zhì)部分熔融的產(chǎn)物。(5)研究區(qū)的巖漿巖記錄了由古亞洲洋向華北克拉通北緣俯沖到最終碰撞造山的全過程,在早二疊世(~290Ma)古亞洲洋板片向華北克拉通北緣的俯沖作用依然在進行中,形成區(qū)內(nèi)具有典型活動大陸邊緣弧特征的大烏淀巖體;在晚二疊世早期(275~265Ma),南蒙古微板塊與華北克拉通北緣已經(jīng)發(fā)生了碰撞拼貼作用,形成具有同碰撞性質(zhì)的趙根陶拉巖體和烏毫來巖體;隨后兩個板塊之間發(fā)生了強烈的碰撞造山作用,地殼明顯加厚,使得中-下地殼物質(zhì)部分熔融形成哈尼河巖體。
[Abstract]:The study area is located in the middle part of the northern margin of the North China Craton, which is about 100km from the northern Solon suture zone. The Mesozoic and late Palaeozoic magma activity is strong. These magma activities not only provide time constraints for the evolution of regional tectonic evolution, but also an important carrier to study the crust mantle interaction on the continental margin and the continental crust evolution. In the study, the typical rock mass of the Permian in the region was selected as the research object. Through the detailed petrology, geochemistry, isotopic geology and chronology, the emplacement times of typical rock bodies in the study area were determined, and the geochemical characteristics of various rock bodies were discussed, and the genesis of the magma and the formation of the magma were revealed. The main understanding of the tectonic setting is as follows: (1) the LA-ICP-MS zircon U-Pb age of the marginal facies of the pluton rock is 265.9 + 2.4Ma. According to the previous data, the Permian intrusive order of the Permian rocks in this area is in order of the great Wu Dian rock mass (~290Ma), the Zhao Gen pluton (~275Ma), the urumi rock mass (265.9Ma), and the Hani river rock mass (2) (65.9Ma) (2) the (2) the characteristics of the Da Wu Dian rock mass and the Zhao Gentao rock body have the characteristics of quasi aluminum and weak peraluminous, all of which are high potassium calc alkaline I type granites. In the trace and rare earth elements, the fractionation of heavy and heavy rare earth elements is obvious, and the major ionic stone elements such as K, Rb and Ba are obviously enriched, and the characteristics of the high field strong elements, such as Nb, Ta, Ti, P and other high field elements, are characterized by the characteristics of the arc magmatic rocks. Pluton has high Mg# value (0.50~0.72), low rare-earth element content, enriched V, Cr, Ni and other compatible elements, enriched K, Sr, Ba and other large ion lithospheric elements (LILE), loss Nb, Ta and other high field elements (HFSE), which are closely related to the partial melting of the rich lithospheric mantle which is subducted by the subduction fluid. The Hani river rock has high silicon and high potassium. The characteristics of peraluminous, characterized by S type granite, heavy and heavy rare earth elements, and strong enrichment of large ion stone elements, loss of high field and strong elements, enrichment of Th, U, and the properties of crust source magma. (3) the great Wu lake rock mass, the Zhao Gentao and urumi rocks have similar Sr-Nd isotopic composition, in (~ (87) Sr/~ (86) Sr The _i- epsilon (Nd) (T) diagram is above the lower left and lower crust evolution lines of the mantle evolution sequence, and has the characteristics of the mixture of crust and mantle magma. Through the two element mixing model of crust mantle magma, it is shown that the didiin rock is a mixture of subducted sheet melts and lower crust melts, while the Zhao Gentao La and urumu rock are subduction flow. The partial melting melt of the enriched lithosphere mantle is mixed with the lower crust melts, and the Hani rock mass has a very high (~ (87) Sr/~ (86) Sr) I ratio (0.732355~0.740484) and a very low Nd (T) value (-34.59~-36.60), similar to the middle and lower crust composition, suggesting that the magma may originate in the middle and lower crust. (4) base rock The geochemical characteristics of the body, combined with the previous research results, suggest that the Da Wu Dian rock formed on the active continental margin environment, which is the product of the subduction of the ancient Asian Ocean to the north margin of the North China Craton, and the Zhao Gentao and urumi rock bodies formed in the transition environment with the collision of the same collision, and the two rocks may be separated from the plate fragments. Resulting in partial melting of the upper enriched lithosphere mantle resulting from the upwelling of the asthenosphere material, and then after mixed dyeing with the lower crust melts, the emplacement formed successively, and the Hani river rock formed in the post collision environment, which is the product of the partial melting of the middle and lower crust material in the crust thickening. (5) the magmatic rocks in the study area have been recorded. The subduction of the ancient Asian Ocean to the northern margin of the North China Craton to the final collision orogenic process, the subduction of the early Permian (~290Ma) palaeo Asian Ocean plates to the northern margin of the North China Craton remains in progress, forming a large Urumqi rock with typical continental margin arcs in the region, and in the early Late Permian (275~265Ma) and southern Mongolia microplates. The collision collage has occurred on the northern margin of the North China Craton to form the Zhao Gentao La pluton with the property of the same collision and the urieli rock mass; then the two plates have a strong collision orogeny between them, and the crust is obviously thickened, so that the middle and lower crust material is partially fused into the Hani river rock mass.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P59;P588.12
本文編號：2132026
[Abstract]:The study area is located in the middle part of the northern margin of the North China Craton, which is about 100km from the northern Solon suture zone. The Mesozoic and late Palaeozoic magma activity is strong. These magma activities not only provide time constraints for the evolution of regional tectonic evolution, but also an important carrier to study the crust mantle interaction on the continental margin and the continental crust evolution. In the study, the typical rock mass of the Permian in the region was selected as the research object. Through the detailed petrology, geochemistry, isotopic geology and chronology, the emplacement times of typical rock bodies in the study area were determined, and the geochemical characteristics of various rock bodies were discussed, and the genesis of the magma and the formation of the magma were revealed. The main understanding of the tectonic setting is as follows: (1) the LA-ICP-MS zircon U-Pb age of the marginal facies of the pluton rock is 265.9 + 2.4Ma. According to the previous data, the Permian intrusive order of the Permian rocks in this area is in order of the great Wu Dian rock mass (~290Ma), the Zhao Gen pluton (~275Ma), the urumi rock mass (265.9Ma), and the Hani river rock mass (2) (65.9Ma) (2) the (2) the characteristics of the Da Wu Dian rock mass and the Zhao Gentao rock body have the characteristics of quasi aluminum and weak peraluminous, all of which are high potassium calc alkaline I type granites. In the trace and rare earth elements, the fractionation of heavy and heavy rare earth elements is obvious, and the major ionic stone elements such as K, Rb and Ba are obviously enriched, and the characteristics of the high field strong elements, such as Nb, Ta, Ti, P and other high field elements, are characterized by the characteristics of the arc magmatic rocks. Pluton has high Mg# value (0.50~0.72), low rare-earth element content, enriched V, Cr, Ni and other compatible elements, enriched K, Sr, Ba and other large ion lithospheric elements (LILE), loss Nb, Ta and other high field elements (HFSE), which are closely related to the partial melting of the rich lithospheric mantle which is subducted by the subduction fluid. The Hani river rock has high silicon and high potassium. The characteristics of peraluminous, characterized by S type granite, heavy and heavy rare earth elements, and strong enrichment of large ion stone elements, loss of high field and strong elements, enrichment of Th, U, and the properties of crust source magma. (3) the great Wu lake rock mass, the Zhao Gentao and urumi rocks have similar Sr-Nd isotopic composition, in (~ (87) Sr/~ (86) Sr The _i- epsilon (Nd) (T) diagram is above the lower left and lower crust evolution lines of the mantle evolution sequence, and has the characteristics of the mixture of crust and mantle magma. Through the two element mixing model of crust mantle magma, it is shown that the didiin rock is a mixture of subducted sheet melts and lower crust melts, while the Zhao Gentao La and urumu rock are subduction flow. The partial melting melt of the enriched lithosphere mantle is mixed with the lower crust melts, and the Hani rock mass has a very high (~ (87) Sr/~ (86) Sr) I ratio (0.732355~0.740484) and a very low Nd (T) value (-34.59~-36.60), similar to the middle and lower crust composition, suggesting that the magma may originate in the middle and lower crust. (4) base rock The geochemical characteristics of the body, combined with the previous research results, suggest that the Da Wu Dian rock formed on the active continental margin environment, which is the product of the subduction of the ancient Asian Ocean to the north margin of the North China Craton, and the Zhao Gentao and urumi rock bodies formed in the transition environment with the collision of the same collision, and the two rocks may be separated from the plate fragments. Resulting in partial melting of the upper enriched lithosphere mantle resulting from the upwelling of the asthenosphere material, and then after mixed dyeing with the lower crust melts, the emplacement formed successively, and the Hani river rock formed in the post collision environment, which is the product of the partial melting of the middle and lower crust material in the crust thickening. (5) the magmatic rocks in the study area have been recorded. The subduction of the ancient Asian Ocean to the northern margin of the North China Craton to the final collision orogenic process, the subduction of the early Permian (~290Ma) palaeo Asian Ocean plates to the northern margin of the North China Craton remains in progress, forming a large Urumqi rock with typical continental margin arcs in the region, and in the early Late Permian (275~265Ma) and southern Mongolia microplates. The collision collage has occurred on the northern margin of the North China Craton to form the Zhao Gentao La pluton with the property of the same collision and the urieli rock mass; then the two plates have a strong collision orogeny between them, and the crust is obviously thickened, so that the middle and lower crust material is partially fused into the Hani river rock mass.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P59;P588.12
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