本文選題：巖石學(xué) + 地球化學(xué)��； 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：冀北尚義變質(zhì)沉積巖位于華北克拉通北緣中段西部,主要分布在朝力蓋、郝報溝、黃土窯、五十家一帶,其總體呈近東西向分布。黃土窯變質(zhì)沉積巖的主要巖石類型包括(含石榴)黑云斜長片麻巖、蛇紋石化大理巖、變質(zhì)長石石英砂巖。其中以(含石榴)黑云斜長片麻巖為主體,蛇紋石化大理巖和變質(zhì)長石石英砂巖呈透鏡狀產(chǎn)出于尚義變質(zhì)火山巖之中,長短大小不一,長度幾米到幾千米不等。(含石榴)黑云斜長片麻巖呈灰色,片麻狀構(gòu)造,斑狀變晶結(jié)構(gòu),基質(zhì)為細(xì)粒鱗片粒狀變晶結(jié)構(gòu)。主要礦物組合為斜長石(35%)、石英(35%)、黑云母(20%)及少量石榴石(約5%),角閃石(1%)和石墨(3%)。黑云母的化學(xué)成分變化不大,均為高鐵黑云母。斜長石(An=22.79-34.66)大部分為更長石,少部分為中長石,不發(fā)育環(huán)帶。石榴子石主要由鐵鋁榴石(Alm=55.43%-65.62%)、錳鋁榴石(Spe=15.36%-29.8%)、和鎂鋁榴石(Pyr=8.36%-13.34%)及少量鈣鋁榴石(Gro=2.39%-7.58%)組成。部分石榴子石具有成分環(huán)帶。蛇紋石化大理巖呈灰白色、白色,塊狀構(gòu)造,中粒粒狀變晶結(jié)構(gòu)。主要礦物組合為方解石(65%)和蛇紋石(30%),次要礦物為橄欖石(2%)和金云母(3%)。變質(zhì)長石石英砂巖呈灰色、褐灰色,塊狀構(gòu)造,中粒粒狀變晶結(jié)構(gòu)。主要礦物組合為石英(70%)和鉀長石(微斜長石,10%),次要礦物有黑云母(5%)、斜長石(5%)和白云母(3%)。(含石榴)黑云斜長片麻巖SiO_2含量變化較大,介于63.56%-77.34%之間,Al2O3的含量比較高(13.15%-15.82%)。Na2O含量為(2.35%-3.3%),MgO含量為(1.23%-3.12%)。CaO含量介于1.91%~3.35%之間。其微量元素Rb、Cs平均含量為78×10-6、5.2×10-6,均明顯低于地殼中平均值(Rb、Cs在地殼中的平均值分別為150×10-6、30×10-6),Ba、Sr平均含量為409×10-6、614×10-6,都高于地殼中平均值(Ba、Sr在地殼中的平均值分別為0.05×10-6、40×10-6)。高場強(qiáng)元素Zr、Hf、Nb及Ta的含量,均低于地殼中相對應(yīng)元素的平均值,Hf同位素基本與地殼中的平均值相等,Zr/Hf比值低于地殼中的平均值(Zr/Hf=66.7)。尚義變質(zhì)沉積巖稀土元素總量(∑REE)變化范圍不大,為84.03×10-6-171.21×10-6。球粒隕石標(biāo)準(zhǔn)化稀土元素配分模式圖顯示LREE富集、HREE平坦,并且大部分樣品具有輕度的負(fù)Eu異常,少部分不見Eu異常。其δEuCN值的變化范圍為0.81-0.95。巖石樣品的(La/Yb)CN值變化范圍比較大,介于4.98-24.72之間,LREE/HREE比值較低,變化于2.28-6.26之間。(含石榴)黑云斜長片麻巖的碎屑鋯石的LA-ICPMS U-Pb年齡,具有多個年齡值,有新太古代、古元古代、中元古代、早-中奧陶世、晚奧陶世、早泥盆世、早石炭世和晚石炭世~早二疊世,表明碎屑鋯石物源區(qū)的多樣性。測得變質(zhì)鋯石的諧和年齡為為262.4±4.4Ma,表明該石榴黑云斜長片麻巖變質(zhì)時代為晚古生代。蛇紋石化大理巖的碎屑鋯石齡數(shù)據(jù)有新太古代、古元古代、中元古代以及早二疊世~中二疊世等,表明尚義蛇紋石化大理巖中碎屑鋯石的物源區(qū)具有多樣性特點。該蛇紋石化大理巖的原巖形成于280.9 Ma之后。在變質(zhì)長石石英砂巖的碎屑鋯石中獲得了包括新太古代、古元古代、中元古代的年齡。變質(zhì)長石石英砂巖的原巖應(yīng)該形成于中元古代(1776Ma)之后。根據(jù)Bhatia和Crook的研究成果顯示,其原巖形成環(huán)境介于大陸島弧環(huán)境與大洋島弧環(huán)境之間,可能更靠近前者。由西蒙南圖解顯示,(含石榴)黑云斜長片麻巖落于砂質(zhì)沉積巖到泥質(zhì)沉積巖區(qū)域,部分位于由砂質(zhì)沉積巖巖區(qū)向泥質(zhì)沉積巖過渡區(qū)域。研究區(qū)樣品的Al/(Al+Fe+Mn)的摩爾比值介于0.76-0.86之間,平均值為0.81,W(Al)/W(Al+Fe+Mn)的比值介于0.61-0.75之間,平均值為0.67。所以(含石榴)黑云斜長片麻巖的原巖物質(zhì)來源是陸源碎屑物。同時其沉積環(huán)境位于大陸邊緣。(含石榴)黑云斜長片麻的(Ce/Ce*)CN值為0.697-1.001(平均為0.868),介于大洋盆地與大陸邊緣之間,且更類似后者的稀土元素特征。因此可以推斷尚義黃土窯變質(zhì)沉積巖的原巖應(yīng)該為泥質(zhì)(或含泥質(zhì))砂巖,是一套形成于晚古生代的陸源碎屑巖,可能形成于大陸島弧環(huán)境。
[Abstract]:The Shangyi metamorphic sedimentary rocks in northern Hebei Province, located in the western part of the north margin of the North China Craton, are mainly distributed in the north of the north of the north of the north margin of the North China Craton, which are mainly distributed in fifty areas. The main rock types of the metamorphic sedimentary rocks of the Loess kiln include (pomegranate) black cloud and inclined marbles, serpentine petrified marble, and metamorphic feldspar quartz sandstone. (pomegranate) black cloud inclined gneiss as the main body, serpentine petrified marble and metamorphic feldspar quartz sandstone are lensed in the form of Shangyi metamorphic volcanic rocks. The length and size vary from a few meters to thousands of meters in length. (pomegranate) black cloud inclined long slice gneiss is gray, flax like structure, porphyritic and crystalline structure, the matrix is fine granular granular granular metamorphism. Structure. The main mineral assemblage is plagioclase (35%), quartz (35%), black mica (20%) and a small amount of garnet (about 5%), hornblende (1%) and graphite (3%). The chemical composition of the black mica has little change, all of which are high iron black mica. Most of An=22.79-34.66 is more feldspar, a few is the feldspar, and the undeveloped ring is not developed. The garnet is mainly ferric and granite. (Alm=55.43%-65.62%), manganese and aluminite (Spe=15.36%-29.8%), and magnesia and aluminate (Pyr=8.36%-13.34%) and a small amount of calcite (Gro=2.39%-7.58%). Some of the garnet have a composition ring. Serpentinite marble is gray white, white, massive, and granular crystalline structure. The main mineral assemblage is calcite (65%) and serpentine (30%). Secondary minerals are olivine (2%) and gold mica (3%). Metamorphic feldspar quartz sandstone is gray, brown gray, massive and granular granular structure. The main mineral assemblages are quartz (70%) and potash feldspar (10%), secondary minerals are biotite (5%), cable-stayed feldspar (5%) and Muscovite (3%). (pomegranate) black cloud slanted gneiss content changes Between 63.56%-77.34%, the content of Al2O3 is higher (13.15%-15.82%).Na2O content (2.35%-3.3%), MgO content is (1.23%-3.12%).CaO content between 1.91%~3.35%. The trace element Rb, Cs average content is 78 x 10-6,5.2 * 10-6, all obviously lower than the average value in the crust. The average value in the crust is 150 * * 10, respectively. -6), the average content of Ba and Sr is 409 x 10-6614 x 10-6, which are higher than the average in the crust (Ba, Sr in the crust is 0.05 * 10-6,40 x 10-6 respectively). The content of high field elements Zr, Hf, Nb and Ta are lower than the average value of the corresponding elements in the crust, and the Hf isotopes are basically equal to the average in the crust, and the Zr/Hf ratio is lower than the average in the crust. Value (Zr/Hf=66.7). The total amount of rare earth elements (sigma REE) of the Shangyi metamorphic sedimentary rocks is small. The normalized REE distribution pattern map of 84.03 x 10-6-171.21 10-6. chondrites shows LREE enrichment and HREE flat, and most of the samples have mild negative Eu anomalies and few Eu anomalies. The variation range of the Delta EuCN value is 0.81-0.95.. The variation range of (La/Yb) CN values of rock samples is relatively large, between 4.98-24.72 and low LREE/HREE ratio, which varies between 2.28-6.26. The LA-ICPMS U-Pb age of the detrital zircon of the black cloud slanted gneiss (including pomegranate) has multiple age values, and there are new Archaean, Proterozoic, Mesoproterozoic, early Middle Ordovician, late Ordovician, early Devonian, early Devonian, and Early Devonian. The Carboniferous and Late Carboniferous ~ Early Permian shows the diversity of the source area of the detrital zircon. The dating age of the metamorphic zircon is 262.4 + 4.4Ma, indicating that the metamorphic age of the pomegranate black cloud is late Palaeozoic. The data of the clastic zircon age of the serpentine marble have the Neo Archaean, Proterozoic, Mesoproterozoic and Early Permian. In the Middle Permian, it is indicated that the source area of the detrital zircon in the serpentine marble of Shangyi is diverse. The protolith of the serpentine marble is formed after 280.9 Ma. In the detrital zircon of the metamorphic feldspar quartz sandstone, the age of the Neoarchean, Proterozoic, Mesoproterozoic and metamorphic feldspar quartz sandstone should be obtained. It is formed after the Middle Proterozoic (1776Ma). According to the research results of Bhatia and Crook, the original rock formation environment is between the continental island arc environment and the oceanic island arc environment, which may be closer to the former. The mole ratio of Al/ (Al+Fe+Mn) in the study area is between 0.76-0.86, the average value is 0.81, the ratio of W (Al) /W (Al+Fe+Mn) is between 0.61-0.75 and the average value is 0.67. so the source of the original rock material of the black cloud slanted gneiss (pomegranate) is the terrigenous clastic. The (Ce/Ce*) CN value of (pomegranate) black cloud is 0.697-1.001 (average 0.868), which is between the ocean basin and the continental margin, and is more similar to the latter's rare earth elements. Therefore, it can be concluded that the original rock of the metamorphic sedimentary rocks in Shangyi loess kiln should be a muddy (or argillaceous) sandstone, which is formed in the late Paleozoic. Terrigenous clastic rocks may be formed in the continental island arc environment.

【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P588.2

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