本文選題：新元古代 + 浦江��； 參考：《浙江大學(xué)》2017年碩士論文

【摘要】：浙西北的新元古代地層零星并且孤立地分散在富陽、浦江、建德、衢州、開化等地。囿于地層對比標志的缺乏,對這些地層的劃分及形成存在不少爭議。本文綜合運用了巖石學(xué)、年代學(xué)以及沉積學(xué)等方法,對比研究了富陽駱家門組、虹赤村組和蒙山陳塘塢組的地層序列、沉積特征、碎屑鋯石年齡特征、粘土礦物特征、重礦物特征,進而分析浦江-蒙山新元古代盆地的沉積、構(gòu)造環(huán)境及演化特征,并提出了可能的演化模式。主要認識如下:1.浦江陳塘塢組由巖屑砂巖、細砂巖、泥質(zhì)粉砂巖、泥巖等組成,發(fā)育韻律層理、沙紋層理、水平層理等。富陽駱家門組主要由砂巖、粉砂巖、泥巖組成,也發(fā)育韻律層理、水平層理、沙紋層理等。除陳塘塢組直接平行整合在以細碧巖為主的蒙山組之上,駱家門組底部出現(xiàn)洪沖積扇礫巖外,浦江的陳塘塢組和富陽的駱家門組在沉積巖組合、沉積構(gòu)造及沉積序列方面基本相同。2.X射線及紅外測試表明,浦江陳塘塢組、富陽駱家門組上段及虹赤村組泥巖組成基本一致,其粘土礦物主要為伊利石、鮞綠泥石,含少量碎屑礦物石英、長石。鮞綠泥石屬自生礦物,形成于淺海環(huán)境,結(jié)合沉積巖組合,分析得出浦江蒙山組的形成環(huán)境為次深海環(huán)境,陳塘塢組為濁積-淺海環(huán)境;富陽駱家門組的形成環(huán)境為沖洪積扇、濱岸水下扇環(huán)境到濁積-淺海環(huán)境,虹赤村組的形成環(huán)境為海灘和潮坪環(huán)境。3.陳塘塢組重礦物組合為鋯石、金紅石、銳鈦礦、石榴子石、磷灰石、磁黃鐵礦和閃鋅礦等,富陽駱家門組磁鐵礦、鋯石、磁黃鐵礦、閃鋅礦、石榴子石和綠簾石等,虹赤村組重礦物組合為鋯石、磷灰石、磁鐵礦、銳鈦礦和閃鋅礦,指示陳塘塢組與駱家門組及虹赤村組的物源都來自火成巖區(qū)。骨架顆粒統(tǒng)計結(jié)果表明,浦江陳塘塢組與富陽駱家門組的碎屑巖物源區(qū)構(gòu)造屬性一致,均為巖漿弧,這個巖漿弧很有可能就是靠近揚子地塊東南緣的雙溪塢群。4.陳塘塢組底部砂巖中的碎屑鋯石都是巖漿鋯石,其鋯石U-Pb年齡分布在830～870Ma之間,最年輕的年齡為829Ma;駱家門組底部砂巖中碎屑鋯石亦為巖漿鋯石,年齡主要分布在840～890Ma,最年輕的年齡為824Ma;富陽虹赤村組的砂巖中的碎屑鋯石也是巖漿鋯石,其U-Pb年齡主要分布在830～930Ma之間。最年輕的碎屑鋯石年齡可近似指示盆地開啟的年齡,由此表明浦江盆地與富陽盆地接受沉積的時間基本一致。5.結(jié)合浦江陳塘塢組和富陽駱家門組兩套地層的沉積巖組合、粘土及重砂礦物特征、物源、沉積相分析,推斷它們屬同一套地層,兩地層所代表的盆地為同一盆地,稱其為富陽-浦江盆地,開啟于840～835Ma左右(由細碧巖年齡指示),并于830～824Ma左右開始接受沉積,為新元古代盆地。在此基礎(chǔ)上,提出富陽-浦江新元古代盆地可能的演化過程和模式:距今835Ma,地殼受到拉張作用伸展,形成裂谷;持續(xù)擴張,沉積濁積巖,形成濁積裂谷盆地,期間發(fā)生裂谷環(huán)境下的巖漿活動;距今800Ma左右,強烈拉張結(jié)束,盆地被虹赤村組填滿;800～760Ma期間,大規(guī)模雙峰式火山噴發(fā),標志著本次裂谷事件的結(jié)束。
[Abstract]:The Neoproterozoic strata in northwestern Zhejiang are scattered and isolated in Fuyang, Pujiang, Jiande, Quzhou, and Kaihua, and there are many disputes on the division and formation of these strata. In this paper, petrology, chronology and sedimentology are used in this paper to compare the Locke of Fuyang and Hong Chi Village. The stratigraphic sequence, sedimentary characteristics, detrital zircon age characteristics, clay mineral characteristics and heavy mineral characteristics of the detrital zircon, and then analyze the sedimentary, tectonic environment and evolution characteristics of the Pujiang montmont Neoproterozoic basin, and put forward the possible evolution patterns. The main understanding is as follows: 1. Pujiang Chen Tangwu formation is composed of lithic sandstone, fine sandstone and mud powder. Sandstone, mudstone and so on, developed rhythmic bedding, sand texture, horizontal bedding, and so on. The Fuyang Locke group is mainly composed of sandstone, siltstone and mudstone, also developed rhythmic bedding, horizontal bedding and sand texture. The basic same.2.X ray and infrared measurements of the sedimentary rock assemblage, sedimentary structure and sedimentary sequence in Pujiang's Chen Tangwu formation and Fuyang's Locke group show that the composition of the mudstone of the Chen Tangwu formation in Pujiang, the upper part of the Fuyang Locke group and the Hong Chek village is basically the same, and the clay minerals are mainly illite, oolitic debris, and a small amount of debris mineral quartz. Feldspar oolitic mudstone belongs to the authigenic mineral, which is formed in shallow sea environment, combining with sedimentary rock assemblage. It is concluded that the formation environment of Mengshan formation in Pujiang is the sub sea environment, the Chen Tangwu formation is turbid and shallow sea environment, and the formation environment of Fuyang Locke group is the alluvial fan, the coastal underwater fan ring to turbid shallow sea environment, and the formation environment of Hong Chi Village formation. The heavy minerals in the beach and tidal flat.3. are composed of zircon, Jin Hongshi, anatase, pomegranite, apatite, magnetite and sphalerite, and the magnetite, zircon, magnetite, pyrite, sphalerite, garnet and epidote in the Fuyang Locke group. The heavy minerals in Hong Chi Village are composed of zircon, apatite, magnetite, anatase and sphalerite. It indicates that the source of the Chen Tangwu formation and the Locke group and the Hong Kun village are all derived from the igneous rock area. The statistical results of the skeleton particles show that the structural properties of the detrital rocks in the Pujiang Chen Tangwu formation are the same as the magma arc in the Fuyang Locke group, and this magma arc is likely to be the bottom of the.4. Tangtang formation near the southeastern margin of the Yanzi block. The detrital zircon in the Ministry sandstone is all magmatic zircon, whose zircon U-Pb age is between 830 and 870Ma, the youngest age is 829Ma, and the detrital zircon is also magmatic zircon in the bottom sandstone of the Locke group, the age is mainly from 840 to 890Ma and the youngest age is 824Ma; the detrital zircons in the sandstone of Hong Chek village in Fuyang are also zircons of magma. The U-Pb age is mainly between 830 and 930Ma. The youngest age of the detrital zircon can approximate the age of the basin, which indicates that the time of the Pujiang basin and the Fuyang basin is basically the same as the sedimentary rocks of the two sets of the Pujiang Tangtang and Fuyang Locke groups, the characteristics of clay and heavy sand minerals. Source and sedimentary facies analysis, it is inferred that they belong to the same set of strata. The basin represented by the two layers is the same basin, which is called the Fuyang Pujiang basin, which is opened at about 840 ~ 835Ma (from the age indication of the fine birock), and from about 830 to 824Ma, the deposit is accepted as a Neoproterozoic basin. On this basis, the possibility of the Neoproterozoic basin of Fuyang Pujiang was proposed. The evolution process and model: 835Ma, the earth's crust was stretched and stretched to form a rift valley, which continued to expand, deposited turbidite, and formed a turbidite basin. During the period of the rift valley, the magma activity occurred; around 800Ma, the intense tension ended, the basin was filled with the Hong Chi Village Group; during the period of 800 ~ 760Ma, large-scale Shuangfeng volcano eruption was marked. The end of this rift event.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P512.2

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