本文選題：豫西南　切入點：構(gòu)造演化　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】：豫西南地區(qū)處于華北克拉通南緣、北秦嶺構(gòu)造帶和揚子克拉通北緣過渡地區(qū),其構(gòu)造演化復(fù)雜,先后經(jīng)歷了華北克拉通的張裂、北秦嶺和南秦嶺構(gòu)造帶的拼貼、與揚子克拉通的碰撞。在中元古代末期-早寒武世,豫西南地區(qū)發(fā)育了大量的富含炭質(zhì)的泥質(zhì)類沉積巖。通過詳細實測地質(zhì)剖面研究認為水溝口組屬于以硅質(zhì)巖為主的一套黑色巖系,煤窯溝組屬于黑色泥質(zhì)巖為主的一套黑色巖系,白術(shù)溝組屬于黑色泥質(zhì)巖-碳酸鹽巖組合的黑色巖系。水溝口組發(fā)育在陸棚邊緣,煤窯溝組為潮坪-淺海相,白術(shù)溝組沉積環(huán)境為局限臺地潮下-潮間環(huán)境,三組地層沉積水深依次變淺。借助顯微鏡、X衍射、電子探針等方法,對白術(shù)溝組、煤窯溝組和水溝口組黑色巖系礦物學(xué)進行研究。煤窯溝組黑色巖系中伊利石相對于白術(shù)溝組更富集釩,同時在黑色巖系中的重晶石和褐鐵礦比較發(fā)育,且發(fā)育有機成因的黃鐵礦。水溝口組黑色巖系中除伊利石富集釩外,褐鐵礦中也明顯富集釩。重晶石、鋇長石和黃鐵礦在水溝口組黑色巖系中發(fā)育廣泛。通過元素地球化學(xué)研究,識別出豫西南地區(qū)三個層位的黑色巖系普遍富集U、P、Ni、Co、Ba和Ag,尤其富集釩元素。過渡元素中,由于釩的價態(tài)的變化導(dǎo)致其富集程度遠遠大于其他元素�？赡苡捎谒畹淖兓绊懫涑练e富集過程導(dǎo)致了三個層位中釩富集程度不同,即發(fā)育在相對深水的陸棚邊緣沉積的水溝口組黑色巖系中釩的含量遠遠高于發(fā)育在潮上-潮下帶的白術(shù)溝組和煤窯溝組黑色巖系釩的含量。應(yīng)用碎屑鋯石年代學(xué)研究首次討論了白術(shù)溝組黑色巖系物質(zhì)來源。結(jié)果顯示盧氏地區(qū)白術(shù)溝組底部的物源區(qū)為克拉通內(nèi)部,記錄了華北克拉通典型構(gòu)造-熱事件。欒川地區(qū)白術(shù)溝組頂部的碎屑鋯石年齡指示了北秦嶺構(gòu)造帶為物源區(qū),記錄了北秦嶺構(gòu)造帶在中新元古代對華北克拉通南緣的影響。借助區(qū)域碎屑鋯石U-Pb年齡和Hf同位素對比研究,推測華北克拉通北部、東部和最南緣在中元古代末期經(jīng)歷了相似的構(gòu)造事件,可能與Rodinia大陸演化有關(guān)。結(jié)合華北克拉通南緣和北秦嶺中-新元古代事件的巖漿事件,討論了~1.7 Ga到1.0 Ga華北克拉通南緣和北秦嶺構(gòu)造帶的演化,認為在~1.0 Ga寬坪洋的閉合導(dǎo)致了北秦嶺和華北克拉通短暫的拼合,使得華北克拉通南緣接受了北秦嶺構(gòu)造帶的碎屑物質(zhì)。
[Abstract]:Southwest Henan is located in the transitional areas of the southern margin of the North China Craton, the North Qinling tectonic belt and the northern margin of the Yangtze Craton. Its tectonic evolution is complicated, and it has experienced the North China Craton fracture, the collage of the North Qinling and the South Qinling tectonic belt successively, Collision with the Yangtze craton. In the late Middle Proterozoic-early Cambrian, A large number of carbonaceous argillaceous sedimentary rocks have been developed in southwest Henan. It is considered that the Shuigou Kou formation belongs to a set of black rock series mainly composed of siliceous rocks through detailed observation of geological profiles. The Miayaogou formation belongs to a set of black rock series dominated by black argillaceous rocks, and the Bazhugou formation belongs to the black rock series of the black mudstone carbonate rock assemblage. The Shuigoukou formation is developed on the margin of the continental shelf, and the Miyaogou formation is a tidal flat shallow marine facies. The depositional environment of the Baizhugou formation is a limited platform subtidal and intertidal environment, and the water depth of the three groups becomes shallower in turn. By means of microscope X-ray diffraction, electron probe and other methods, the Atrachugou formation is studied. The mineralogy of the black rock series of the Miayaogou formation and the Shuigoukou formation is studied. The Illite in the black rock series of the Miayaogou formation is more rich in vanadium than that in the Baizhugou formation, and the barite and limonite in the black rock series are relatively developed. The black rock series of Shuigoukou formation, in addition to Illite enriched vanadium, limonite is also obviously enriched in vanadiumbarite, Barium feldspar and pyrite are widely developed in the black rock series of Shuigoukou formation. Based on the study of element geochemistry, it is recognized that the black rock series of three layers in southwest Henan Province are generally enriched in U Pu Pu Ni Ni CoCo Ba and Ag, especially in vanadium elements. Because of the change of valence state of vanadium, the enrichment degree of vanadium is much higher than that of other elements. It is possible that the variation of water depth affects the process of deposition and enrichment of vanadium in the three layers, and the enrichment degree of vanadium in the three layers is different. The vanadium content in the black rock series of the Shuigoukou formation, which developed on the margin of the continental shelf relatively deep water, is much higher than that in the black rock series of the Baizhugou formation and the Miyaogou formation developed in the supratidal-subtidal zone. The zircon chronology of clastic zircon is used. The source of material in black rock series of the Baizhugou formation is discussed for the first time. The results show that the source area at the bottom of the Bazhugou formation in Lushi area is the interior of the craton. The typical tectonic-thermal events of the North China Craton are recorded. The age of detrital zircon at the top of the Bazhugou formation in Luanchuan area indicates that the North Qinling tectonic belt is a provenance. The influence of the North Qinling tectonic belt on the southern margin of the North China Craton was recorded in the MesoNeoproterozoic. Based on a comparative study of zircon U-Pb ages and HF isotopes in the northern part of the North China craton, The eastern and southernmost margin experienced similar tectonic events at the end of the Middle Proterozoic, which may be related to the evolution of the Rodinia continent. The magmatic events in the southern margin of the North China Craton and the North Qinling Mid-Neoproterozoic event, The evolution of the southern margin of the North China Craton and the North Qinling tectonic belt from 1.7 Ga to 1.0 Ga is discussed. It is considered that the closure of the North Qinling and North China Cratons at 1.0 Ga has resulted in the temporary assemblage of the North Qinling and the North China Craton. The southern margin of the North China Craton accepted the clastic material of the North Qinling tectonic belt.
【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】：P542;P611

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