西藏冈底斯带中南部与俯冲有关的早侏罗世花岗闪长岩:锆石U-Pb年代学及地球化学证据          下载免费PDF全文

陈炜  马昌前  宋志强 《地质科技通报》2011,30(6):1-12

肖打松多花岗闪长岩位于西藏冈底斯花岗岩带中段以南,主要岩石类型有:细中粒黑云母(角闪石)花岗闪长岩、细中粒
含斑黑云母(角闪石)花岗闪长岩、细中粒斑状黑云母(角闪石)花岗闪长岩,岩石具钙碱性特征,w(SiO₂)=61.58%~72.16%,
w(K₂O)/w(Na₂O)=0.64~1.15,相对富钠,A/CNK=1.25~1.43,w(Al₂O₃)变化于11.45%~16.00%之间,为准铝质岩石,花
岗闪长岩岩体稀土元素总量w(ΣREE)变化于152.10×10-6~251.22×10-6之间;轻稀土元素富集,负Eu异常较明显,以富K、
Rb、Ba、Th等大离子亲石元素和亏损Nb、Y、Yb等高场强元素为特征。岩石学和岩石地球化学研究表明,该时期的花岗闪长岩具
俯冲I型花岗岩的特点,形成于板块俯冲下的岛弧环境。用SHRIMP测定肖打松多花岗闪长岩体锆石的U-Pb年龄为(191.9±
1.1)Ma。同时表明冈底斯岩浆弧带在早侏罗世岩浆曾经剧烈地活动过,肖打松多岩体是新特提斯洋向北俯冲作用的产物。   相似文献   

江西于都马岭岩体地球化学特征及其找矿意义          下载免费PDF全文

邵飞  许健俊  张展适  邹茂卿  石亚飞  刘金枝  吴奕 《地质科技通报》2014,33(4):12

马岭岩体是大埠岩体的一部分,大埠岩体已发现有铀、钨(锡)矿产。地球化学特征显示马岭花岗岩属陆内S型花岗岩,
呈钙碱性、过铝质,具富硅[w(SiO₂)为73.73%~75.73%]、略富碱[w (K₂O+Na₂O)为7.63%~8.63%]、高钾[w (K₂O)为
3.99%~5.60%]和低钙[w(CaO)为0.239%~0.662%]特点,铝饱和指数A/NCK为1.04~1.20。稀土元素配分曲线呈LREE
富集、HREE亏损,具强负铕异常的“V”字型,大离子亲石元素富集,Ba、Sr、P、Ti亏损,Al₂O₃/TiO₂ 比值>100,低Sr高Yb的特
征表明马岭花岗岩体形成是古老陆壳物质部分熔融的产物,原岩部分熔融的温度<875℃,岩体形成时的压力较低、深度较浅。结
合华南成矿花岗岩地球化学特征分析,马岭花岗岩体具铀、钨(锡)矿成矿潜力。   相似文献   

内蒙古基东地区晚泥盆世辉长岩体岩石地球化学特征及其意义          下载免费PDF全文

张小强  魏启荣  魏俊浩  孙骥  郝伟  张德才 《地质科技通报》2012,31(6):80

内蒙古基东地区辉长岩体位于北山成矿带北侧的石板井-七一山-呼伦西伯成矿带西北缘。该辉长岩体的岩石类型
主要为辉长岩,次为角闪辉长岩,少量为辉长闪长岩。对辉长岩体进行了LA-ICP-MS锆石U-Pb测年以及主微量元素等分析。研
究结果显示:辉长岩体形成于晚泥盆世(D3),其LA-ICP-MS锆石U-Pb年龄为(371.3±2.0)Ma。辉长岩体主量元素表现出富Al [w(Al2O3)=17.94%~20.93%]、高Na[w(Na2O)=2.08%~3.75%]和低K[w(K2O)=0.16%~0.98%]的岩石地球化学特
征,属钙碱性系列。稀土元素配分模式为LREE富集的右倾型,其(La/Yb)N 比值为1.92~4.62,无铈异常(Ce/Ce* =1.00~
1.11),部分具正Eu异常(Eu/Eu* =1.08~2.20)。微量元素比值蛛网图表现出P、Ti的亏损和Sr的富集。辉长岩体形成于岩浆
弧环境,属白山晚古生代岩浆弧的组成部分,是红石山大洋向南俯冲所形成的岩浆产物。   相似文献   

内蒙古东乌旗巴彦都兰二长花岗岩年代学、地球化学特征及其地质意义          下载免费PDF全文

李敏  李敏  程银行  李艳锋 《地质科技通报》2015,34(4):6-14

为了解晚古生代西伯利亚板块南缘增生造山过程中的岩浆活动特征,对东乌旗巴彦都兰二长花岗岩岩相学、锆石U-Pb年代学、锆石Hf同位素和岩石地球化学进行了研究,并讨论了岩石成因和构造环境。锆石LA-ICP-MS U-Pb定年结果为(277.2±0.7)Ma,以正的锆石ε_Hf(t)(6.8~14.1)为特征,具有年轻的锆石地壳模式年龄(tc_DM)(865~655 Ma),属于早二叠世晚期岩浆活动产物。二长花岗岩以高钾[w(K)=3.63%~4.95%,K₂O/Na₂O=0.91~1.47]、富碱[w(K₂O+Na₂O)=7.52%~9.16%]、准铝质-弱过铝质(A/CNK=0.96~1.15)为特征;稀土元素总量较低(38.82×10-6~193.20×10-6),(La/Yb)_N为3.91~23.08,轻、重稀土元素分异较明显,呈弱负铕异常(δEu为0.34~1.17);富集部分大离子亲石元素(LREE、Rb、K等);Zr弱负异常、Hf弱正异常,亏损Sr、Nb、Ta、P、Ti,显示后造山花岗岩特征。综合分析表明,巴彦都兰二长花岗岩形成于伸展的构造环境中,是贺根山洋盆闭合后的后造山阶段产物,为865~655 Ma前洋壳俯冲形成的先成地壳部分熔融而成。   相似文献   

北山磁海辉绿岩型铁矿区基性杂岩锆石U-Pb年代学及岩石成因          下载免费PDF全文

陈继平  廖群安  罗婷  张雄华  郭东宝  朱和林  柳小明 《地质科技通报》2013,31(4):76

磁海辉绿岩型铁矿位于塔里木北缘北山裂谷带,主要岩石类型为辉绿岩,岩石具有较高的Mg# (55.7~70.1)、中铝
Al₂O₃(13.75~14.65)特征,Na2O/K2O(1.79~14.04)变化较大,整体属于钙碱性系列(K₂O/Na₂O=0.07~0.56,FeO/MgO=
0.77~1.46)。稀土元素方面,磁海辉绿岩具有较高的稀土元素质量分数和δEu异常特征[w(ΣREE)=88.01×10-6~213.07×
10-6,δEu=0.63~1.44],球粒陨石标准化稀土元素配分模式为缓右倾型[(La/Yb)N=1.32~3.87,(La/Sm)_N=1.05~2.17,
(Gd/Yb)_N=1.12~1.58],微量元素上选择性富集大离子亲石元素(Rb、K),亏损高场强元素(Nb、Ta)。岩浆演化过程中斜长石
和单斜辉石的分离结晶作用是岩浆演化的主要机制,同时伴有较为明显的地壳混染作用。LA-ICP-MS锆石U-Pb年代学指示该
辉绿岩形成于约291.9Ma,构造环境分析表明磁海辉绿岩为板内拉张环境的产物。   相似文献   

南太行山平顺闪长岩体SHRIMP锆石U-Pb年龄、地球化学特征及地质意义          下载免费PDF全文

张海东  高海龙  刘建朝  张苏楠  彭素霞  王瑞美  吴继莲  黄水文 《地质科技通报》2013,32(2):41

南太行山平顺闪长岩锆石SHRIMP测年表明闪长岩体形成于(125.5±2.3)Ma,与太行山其他地区乃至整个华北地区
侵入杂岩体具有相近的形成年代,表明在晚中生代(115~135Ma)太行山地区与华北地区经历了相同的构造岩浆事件。平顺闪长
岩w(SiO2)=48.57%~63.54%,w(Al2O3)=13.53%~19.15%,w(MgO)=1.20%~9.31%,w(TiO2)=0.34%~1.07%,
w(CaO)=3.13%~10.39%,w(K2O+Na2O)=4.78%~7.99%,Mg# =0.37~0.72,LREE富集HREE亏损,略显微弱的正Eu
异常,以富集LILE、LREE元素和亏损Nb-Ta等高场强元素为特征。闪长岩(206Pb/204Pb)i=17.775~18.857,(207Pb/204Pb)i=
15.522~15.602,(208Pb/204Pb)i=38.044~38.502,εNd(125Ma)=-17.00956~-9.60632,ISr=0.70585~0.70753,表明起
源于EMI富集地幔,并受到地壳物质和EMII型富集地幔混染,可能说明在晚白垩世太行山地区与整个华北克拉通都发生了岩石圈
减薄事件。   相似文献   

粤北大宝山次英安斑岩中副矿物榍石的初步研究          下载免费PDF全文

潘会彬  康志强  杨锋  付文春 《地质科技通报》2014,33(3):44

榍石是花岗岩,尤其是钙碱性花岗岩中常见的副矿物之一。利用背散射图像和电子探针成分分析对粤北大宝山矿区岩
心样品(次英安斑岩)中的榍石进行了系统的矿物学研究。结果表明,研究区榍石可分为岩浆榍石和次生(热液)榍石两类,其中岩
浆榍石为自形至半自形,颗粒较大,具环带结构,平均w(Al₂O₃)=1.24%,w(TiO₂)=38.10%,w(F)=0.40%;次生(热液)榍石
与绿泥石等蚀变矿物共生,多呈它形,平均w(Al₂O₃)=2.44%,w(TiO2)=36.02%,w(F)=1.00%。榍石的不同世代、成因、副
矿物组合特征等可以揭示花岗岩的形成条件、演化历史,且对判别花岗岩的成因类型具有重要意义。   相似文献   

北秦岭宝鸡地区早志留世鸡冠崖高分异碰撞型花岗岩          下载免费PDF全文

徐通  郭岐明  陈清敏  王强  张拴厚  左文乾  任仓智 《地质科技通报》2018,37(1):79-87

对北秦岭宝鸡地区鸡冠崖花岗岩进行了LA-ICP-MS锆石U-Pb年代学和岩石地球化学研究。结果显示，锆石206Pb/238Pb加权平均年龄为(435±2)Ma(MSWD=0.13,n=22)，限定该岩体的形成时代为早志留世。鸡冠崖花岗岩具有高硅(w(SiO₂)=72.77%~77.71%)、富钾(w(K₂O)=3.51%~6.32%)、低铁(w(Fe₂OT₃)= 0.71%~1.30%，Fe₂OT₃/MgO=2.71~7.29)、低镁(w(MgO)=0.14%~0.31%)、低磷(w(P₂O₅)= 0.05%~0.10%)的特征，A/CNK=0.94~1.10，AR=2.95~4.10，属准铝质至弱过铝质、钙碱性系列。鸡冠崖花岗岩稀土元素质量分数较低(32×10-6~102×10-6)，铕异常明显(δEu=0.22~13.83)，富集Rb、U、Th、Nd、Zr、Hf等微量元素，贫Ba、Nb、P、Ti等元素，分异程度较高(DI=89~93)，整体表现出高分异I型花岗岩特征。结合区域资料，认为鸡冠崖花岗岩形成于同碰撞构造环境，为下地壳物质部分熔融成因。   相似文献   

赣西北麦斜岩体的成因:地球化学、锆石U-Pb年代学及Hf同位素制约          下载免费PDF全文

农军年  钟玉芳  刘磊  刘园园  熊富浩  邹瑜 《地质科技通报》2012,31(2):9

对麦斜岩体2个代表性样品进行LA-ICP-MS锆石U-Pb测年,获得206Pb/238U加权平均年龄分别为(434±2)Ma和
(437±2)Ma,说明该岩体形成于加里东期。麦斜花岗闪长岩为高钾钙碱性、准铝Ⅰ型花岗岩,具有高Ba-Sr花岗岩的地球化学特
征,其w(Ba)(838~1171μg/g)、w(Sr)(346~485μg/g)高,w(Y)(<19μg/g)、w(Yb)(<1.8μg/g)及w(Rb)/w(Sr)比值(平均
为0.37)低,具有弱的Eu负异常,亏损Nb、P、Ti等高场强元素。锆石的εHf(t)值变化范围在-35.32~-1.50之间,二阶段模式
年龄(T2DM)在3.63~1.51Ga之间,指示花岗岩主要来自中元古-古元古代古老地壳,并有年青幔源组分的参与。结合岩体的化
学组成、锆石Hf同位素的不均匀性及微粒闪长质包体发育状况,推测麦斜岩体主要由基性下地壳部分熔融形成,岩浆形成过程中
有幔源基性岩浆和表壳物质的加入。   相似文献   

湖南五峰仙岩体岩石地球化学、SHRIMP U-Pb年龄及Hf同位素特征          下载免费PDF全文

陈迪  刘珏懿  王先辉  杨俊  马铁球  罗来 《地质科技通报》2017,36(6):1-12

对湖南中生代的五峰仙岩体进行了锆石SHRIMP U-Pb定年和岩石学、岩石地球化学分析。该岩体主要由印支期的中粒斑状黑云母二长花岗岩、细粒二云母二长花岗岩组成。本次获得黑云母二长花岗岩的锆石U-Pb年龄(233.5±2.5)Ma,表明形成于晚三叠世;结合已发表的岩体年龄资料,五峰仙岩体侵位于236~233.5 Ma和221.6 Ma,具有多阶段岩浆活动特点。五峰仙花岗岩具有高的w(SiO₂)、w(P₂O₅),含过铝质的白云母,表现为弱铝质、强铝质岩石;微量元素方面,大离子元素Rb、Th、U富集,Nb、Ba、Sr、Ti亏损明显,稀土元素配分模式右倾,轻稀土元素富集,Eu亏损相对明显以及高的Rb/Sr比值,[JP2]为高成熟度陆壳物质重熔的S型花岗岩。黑云母花岗岩中发育暗色微粒包体,具淬冷结构、含长石捕获晶及呈塑形变等特征的包体为岩浆混合成因,该类花岗岩中锆石Hf同位素_εHf(t)值较高,为-4.4～0.7,Hf同位素的两阶段模式年龄T_DM2值为1 534~1 216 Ma,变化范围较大,可能是受幔源岩浆作用所致。五峰仙岩体是在印支板块向华南板块俯冲碰撞期后(变质基底年龄258～243 Ma)及华南板块与华北板块的碰撞期间(超高压变质峰期在238～218 Ma)华南内陆由挤压向伸展转换的背景下形成的。   相似文献   

GEOCHEMICAL STUDIES OF Fe,Mn,Co,As,Cr,Sb,Zn,Sc AND V IN SURFACE SEDIMENTS FROM JIAOZHOU BAY     

吴润  李培泉  苗录田  张树莘  田伟之 《中国海洋湖沼学报》1994,12(4):331-338

The contents of nearly forty-elements in surface sediments in Jiaozhou Bay were determined using a Neutron Activation Analysis Technique(Grancini,et al.,1976;Li Peiquan et al.,1985,1986;Li Xiuxia etal.,1986).This paper's detailed discussion on only nine elements(Fe,Mn,Co,Cr,Sc,As,Sb,Zn andV)includes their distributions,concentrations,correlationships,material sources,background,etc.Based on Zavaristski's classification method,Fe,Mn,Co Cr and V belong to the second group;As and Sb to theeighth groups:Sc and Zn to the third and sixth groups.It was found that their notably good correla-tionship is mainly due to the similarity of their ionic structures and that their variation is controlled by theFe content(except Mn).The source of sediments is mainly terristrial material,and the composition ofsediment is similar to that of shale and shale+clay.The contents for a large number of ele-ments are within the scope of the background level,but there still is pollution of Zn and Cr,at least in a few stations.  相似文献   

氟、氯、溴、碘等卤族元素与人体健康的关系   总被引：1，自引：0，他引：1  

曾昭华  曾雪萍 《国土资源导刊(湖南)》2002,21(3):221-224

卤族元素是人体的必需元素,正常情况下成人摄入量不超过F4 mg/d、C11.7～5.1g/d、I 100～200μg/d;少年不超过F 3 mg/d,儿童I1μg/kg-d,婴儿Cl0.3～1.2 g/d.过量摄入或缺乏卤族元素,都可能导致疾病的发生.而F含量0.5～1.0mg/L、C1＜50mg/L、Br＞100μg/L、I 10～100μg/L的饮用地下水,有利于人体健康.  相似文献   

Controlling mechanisms for the trace metals, (Cu,Zn, Cd,Fe, Co and Ni) in anoxic sea water in Saanich Inlet,British Columbia,Canada     

Zhan Binqiu  C. S. Wong  W. K. Johnson 《中国海洋湖沼学报》1987,5(3):193-204

A study was conducted on Cu, Zn, Cd, Fe, Co and Ni levels in Saanich Inlet anoxic seawater. Data on the concentration of these trace metals and H₂S, and other oceanographic parameters were obtained in four cruises. Equilibrium models are presented together with in situ data. The results strongly support the assumption that the solubilities of Cu, Zn, Cd, Fe, Co and Ni are controlled by bisulfide and/or polysulfide complexes. The species of Cu, Zn, Cd and Ni are shown to be Cu(S₄) ₂ ³⁻ and Cu(Sn₄S₅)³⁻, Zn(HS) ₂ ⁰ and ZnHS ₂ ⁻ , Cd(HS) ₂ ⁰ and Ni(HS) ₂ ⁰ , respectively. The solid species controlling Fe²⁺ and Co²⁺ are respectively the pyrohotites FeS and CoS. The data illustrates that thermodynamic equilibrium has been established in the H₂S-controlled seawater of Saanich Inlet, and that equilibrium has not been established in the H₂S−O₂-coexisted seawater of Saanich Inlet. The lack of equilibrium in the H₂S−O₂-coexisted seawater is a result of the flushing or mixing of oxygenated seawater with anoxic water. The new species of trace metals are still in the processes of reduction and precipitation. Contribution No. 1428 from Institute of Oceanology, Academia Sinica  相似文献   

Effects of small peptides,probiotics, prebiotics,and synbiotics on growth performance,digestive enzymes,and oxidative stress in orange-spotted grouper,Epinephelus coioides,juveniles reared in artificial seawater     

《中国海洋湖沼学报》2017,(1)

Aquaculture production efficiency may increase by using feed additives. This study investigated the effects of different dietary additives [w/w: 2% small peptides, 0.01% probiotics( Bacillus licheniformis) and 0.2% prebiotics(inulin)] on growth performance, digestive enzyme activities, and oxidative stress in juvenile Epinephelus coioides reared in artificial seawater of two salt concentrations(13.5 vs. 28.5). Weight gain rate was significantly higher in fish fed the diet supplemented with small peptides, B. licheniformis, inulin, or synbiotics than that in fish fed the basal diet; the greatest weight gain rate was found in fish fed the small peptide treatment [56.0% higher than basal diet]. Higher feed efficiency was detected in fish fed the diet supplemented with small peptides than that of fish in the other dietary treatments. Total protease activity in the stomach and intestines was highest in fish fed the small peptide-treated diet, whereas lipase activity was highest in those fed synbiotics(combination of Bacillus licheniformis and inulin) than that in fish fed the other treatments. Antioxidant enzyme(total superoxide dismutase and catalase) activities and hepatic malondialdehyde content were higher in fish receiving the dietary supplements and maintained in artificial seawater containing 13.5 salinity compared with those in the control(28.5). Hepatic catalase activity in grouper fed the diets with small peptides or synbiotics decreased significantly compared with that in control fish. Overall, the three types of additives improved growth rate of juvenile grouper and digestive enzymes activities to varying degrees but did not effectively improve antioxidant capacity under low-salinity stress conditions.  相似文献   

First record of marine crab, Eucrate alcocki Serne, in Serène and Lohavanijaya, 1973 (Crustacea, Decapoda, Brachyura, Euryplacidae) from India     

M. RAJKUMAR  K. P. KUMARAGURU VASAGAM  LI Xinzheng  SUN Jun 《中国海洋湖沼学报》2009,27(4)

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Growth,reproduction & population structure of the freshwater crabSinopotamon yangtsekiense bott, 1967, from Zhejiang,China     

Chen Tao  Lai Wei  Du Nan-shan 《中国海洋湖沼学报》1994,12(1):84-90

Monthly investigations were mae on the population of Chinese freshwater crab,Sinopotamon yangtsekiense Bott, 1967 from April, 1984 to March, 1985. The data on 4413 specimens show that the growth was affected mainly by temperature. During the April to November growth period, the crabs' major development occurred from June through October. One year was required for a fine white oocyte to develop into a mature egg. The reproduction period was June–October. Females bearing eggs were taken from June–August, and crabs with young were found from July–October. The females reproduced once a year but could for more than one year. The number of eggs carried by a female varied greatly according to the size of the crab, ranging from 30 to 100 eggs. New-born crabs become mature after 1–2 years. The sex ratio was approximately 1∶1 in the overall population. However, the larger crabs are predominantly male. The age distribution ofS. yangtsekinese was estimated from size frequency histograms. There were more adult crabs (over 70%) from June to October and more immature crabs (over 50%) from November to May.  相似文献   

气、水、岩、生、人相互作用及其环境效应     

孙建中 《地球科学与环境学报》1993,(Z2)

这里所指示的大气圈、水圈、岩石圈、生物圈以及人类的作用千变万化,从而对人类的生存造成巨大影响,构成了一个复杂的生态环境,讨论这些问题,对人类生存至关重要。  相似文献   

GROWTH, REPRODUCTION & POPULATION STRUCTURE OF THE FRESHWATER CRAB SINOPOTAMON YANG TSEKIENSE BOTT, 1967, FROM ZHEJIANG, CHINA     

陈涛  赖伟  堵南山 《中国海洋湖沼学报》1994,(1)

Monthly investigatiom were made on the population of Chinese freshwater crab, Sinopotamon yangteskiense Bott, 1967 from April, 1984 to Match, 1985. The data on 4413 specimens show that the growth was affected mainly by temperature. During the April to November growth period, the crabs' major development occured from June through October. One year was required for a fine white oocyte to develop into a mature egg. The reproduction period was June-October. Females bearing eggs were taken from June-August, and crabs with young were found from July-October. The females reproduced once a year but could for more than one year. The number of eggs carried by a female varied greatly according to the size of the crab, ranging from 30 to 100 eggs. New-bom crabs become mature after 1-2 yeats. The sex ratio was approximately 1:1 in the overall population. However, the larger crabs are predominantly male. The age distribution of S. yangtsekinese was estimated from size frequency histograms. There were more adult crabs  相似文献   

CONTROLLING MECHANISMS FOR THE TRACE METALS,(Cu,Zn, Cd, Fe, Co AND Ni) IN ANOXIC SEA WATER IN SAANICH INLET, BRITISH COLUMBIA, CANADA     

詹滨秋  Wong C.S  Johnson W.K 《中国海洋湖沼学报》1987,(3)

A study was conducted on Cu, Zn, Cd, Fe, Co and Ni levels in Saanich Inlet anoxic seawaler. Data on the concentrations of these trace metals and H2S, and other oceanographic parameters were obtained in four cruisesEquilibrium models are presented together with in situ data. The" results strongly support the assumption that the solubilities of Cu, Zn, Cd, Fe, Co and Ni are controlled by bisulfide and /or polysulfide complexes. The species of Cu, Zn, Cd and Ni are shown to be Cu(S4)23- and Cu(S4S5)3-, Zn(HS)20 and ZnHS2-, Cd(HS)20 and Ni(HS)20 respectively. The solid species controlling Fe2 + and Co2+ are respectively the pyrohotites FeS and CoS. The data illustrates that thermodynamic equilibrium has been established in the H2S-controlled seawater of Saanich Inlet, and that equilibrium has not been established in the H2S-O2-coexisted seawater of Saanich Inlet. The lack of equilibrium in the H2S-O2-coexisted seawater is a result of the flushing or mixing of oxygenated seawater with anoxic water. The new s  相似文献   

石漠化的成因机理与防治对策     

周锦忠  吕英娟 《国土资源导刊(湖南)》2003,22(1):43-46

从石漠化的研究现状出发,依据我国西南岩溶石山地区石漠化特征,着重分析其主要控制介质为岩性、构造、地貌、气候、岩溶、地下水、植被等自然介质因子与森林砍伐、高坡开垦等人为介质因子.石漠化是以岩溶山区脆弱的岩溶生态环境为基础,以内、外地质作用和人类恶性生态地质作用为驱动力,以资源退化和恶化为本质,基岩不断裸露,生态环境不断恶化,周而复始的恶性循环过程.提出对石漠化的研究重点是成因机理研究,对石漠化的防治应着重于对石漠化的驱动力及其主导因子的防治,阐述了治山必须先治水等防治对策与建议.  相似文献