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主要利用近年来在陕西洛南县莲花沟岩体中获取的一些实际资料,通过综合对比研究总结出一些与区域上其他成矿小
侵入体完全不同的成岩成矿特征。主要包括:①莲花沟岩体是一个以闪长岩为主的二长花岗斑岩—闪长岩型岩体,其成分明显是
以相对富钙、镁、铁,低硅、碱而别于同带其他类型小侵入体;②按岩石化学成分,岩体缺少w(SiO2)为55%~65%的中性岩石组
合,呈一种较典型的“双峰式”岩套,且从稀土元素分配模式看,在两种类型岩石间不存在分离结晶作用成因关系,而似乎表现为一
种分层熔融的双层岩浆房成岩模型;③所建的成矿模型,除岩体边缘接触带中的矽卡岩型铁铜矿和层控-构造蚀变岩型钼铅锌矿
系列外,岩体内部主要以隐爆角砾岩筒-斑岩型钼铜矿化为特征,这种隐爆角砾岩既不同于北边祁雨沟含金片麻岩中的爆破角砾
岩筒,也不同于南边河南镇平县秋树湾的碳酸盐岩型爆破角砾岩筒,且成矿元素组合主要是钼铜类型;④由岩石地球化学和锆石
U-Pb同位素年龄数据揭示,形成二长花岗斑岩熔浆的源岩与中元古代熊耳群的一套富钾类型变火山沉积岩系有较好的源区关
系,而闪长岩则与软流圈上涌,基性岩浆底侵及太华群源岩有较密切的关系。无疑,以上成果对丰富东秦岭地区钼多金属成矿作
用认识将提供和补充一些新的资料和实例,特别是“双峰式”岩套的存在,对东秦岭地区主要成钼时代的地球动力学背景分析也是
一个重要的证据,而且还提示在东秦岭地区有发现新类型岩体和矿床的潜在条件。 相似文献
侵入体完全不同的成岩成矿特征。主要包括:①莲花沟岩体是一个以闪长岩为主的二长花岗斑岩—闪长岩型岩体,其成分明显是
以相对富钙、镁、铁,低硅、碱而别于同带其他类型小侵入体;②按岩石化学成分,岩体缺少w(SiO2)为55%~65%的中性岩石组
合,呈一种较典型的“双峰式”岩套,且从稀土元素分配模式看,在两种类型岩石间不存在分离结晶作用成因关系,而似乎表现为一
种分层熔融的双层岩浆房成岩模型;③所建的成矿模型,除岩体边缘接触带中的矽卡岩型铁铜矿和层控-构造蚀变岩型钼铅锌矿
系列外,岩体内部主要以隐爆角砾岩筒-斑岩型钼铜矿化为特征,这种隐爆角砾岩既不同于北边祁雨沟含金片麻岩中的爆破角砾
岩筒,也不同于南边河南镇平县秋树湾的碳酸盐岩型爆破角砾岩筒,且成矿元素组合主要是钼铜类型;④由岩石地球化学和锆石
U-Pb同位素年龄数据揭示,形成二长花岗斑岩熔浆的源岩与中元古代熊耳群的一套富钾类型变火山沉积岩系有较好的源区关
系,而闪长岩则与软流圈上涌,基性岩浆底侵及太华群源岩有较密切的关系。无疑,以上成果对丰富东秦岭地区钼多金属成矿作
用认识将提供和补充一些新的资料和实例,特别是“双峰式”岩套的存在,对东秦岭地区主要成钼时代的地球动力学背景分析也是
一个重要的证据,而且还提示在东秦岭地区有发现新类型岩体和矿床的潜在条件。 相似文献
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本文详细描述了豫西嵩县洛宁隐爆角砾岩体的地质特征和产出规律,论证了角砾岩体的形成与燕山中晚期岩浆活动有密切的成因联系。首次提出并厘定了角砾岩体的多期次,对其多期性与成矿的关系做了探讨,指出了含矿角砾岩体的鉴别标志,对在该地区及类似地区寻找角砾岩型金矿床具有重要参考价值。 相似文献
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依据勘查区找矿预测理论方法,对山东省七宝山矿集区进行找矿预测研究工作,通过总结成矿地质体、成矿构造与成矿结构面、成矿作用特征标志,认为矿集区内成矿地质体为次火山岩体,成矿构造为隐爆角砾岩筒、原生断裂、次生断裂,成矿结构面为隐爆角砾岩筒、断裂及层凝灰岩与次火山岩岩性界面;成矿作用特征标志:金线头金铜矿为隐爆角砾岩+镜铁矿+硅化+黄铁矿,七宝山铜及多金属矿为构造蚀变岩+锰矿化+铁帽。建立七宝山地区陆相火山热液型矿床综合找矿预测模型,圈定七宝山找矿靶区,通过查证,发现含矿隐爆角砾岩带一条,估算求得铜金属量1.47万t;铅金属量1.39万t。本次"三位一体"研究成果,对矿集区开展找矿预测工作具有较强的指导意义。 相似文献
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川中地区须家河组是四川盆地致密砂岩气藏储量的主要集中区,而气水分布规律复杂则是造成该区各致密砂岩气藏气
井出水严重、产量递减迅速的重要原因。该区致密砂岩气藏的气水分布在剖面上和平面上总体表现为气水过渡带特征,气、水层
交互分布。综合气水分布特征、地质背景及生产动态,总结出3种符合该区致密砂岩气藏气水分布的模式:构造带气水分布模式、
低渗带气水分布模式及裂缝带气水分布模式,并从气源岩、局部构造、致密砂岩储层及储层裂缝4个方面分析了控制该区致密砂
岩气藏气水分布的因素:气源岩充注不足形成了该区气水过渡带的整体特征;局部构造的闭合度控制了气水的分异程度;致密砂
岩储层提高了气水的排替难度;储层裂缝提供了气水的渗流通道。 相似文献
井出水严重、产量递减迅速的重要原因。该区致密砂岩气藏的气水分布在剖面上和平面上总体表现为气水过渡带特征,气、水层
交互分布。综合气水分布特征、地质背景及生产动态,总结出3种符合该区致密砂岩气藏气水分布的模式:构造带气水分布模式、
低渗带气水分布模式及裂缝带气水分布模式,并从气源岩、局部构造、致密砂岩储层及储层裂缝4个方面分析了控制该区致密砂
岩气藏气水分布的因素:气源岩充注不足形成了该区气水过渡带的整体特征;局部构造的闭合度控制了气水的分异程度;致密砂
岩储层提高了气水的排替难度;储层裂缝提供了气水的渗流通道。 相似文献
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七宝山金铜矿位于胶莱盆地西南缘的七宝山地区,在金铜矿外围新发现长老庄含矿隐爆角砾岩带一条, 物探解译工作初步查明了该隐爆角砾岩带地质及地球物理特征：位于激电中梯高阻和低阻接触带上,深部呈低阻、中高激化异常。经钻探验证,在深部发现高品位的银铜铅矿体,矿石中粗粒方铅矿、黄铜矿结晶体肉眼可见,呈团块状富集,铜品位0.493%～5.125%,铅品位0.245%～6.606%,银品位55.2～547.1g/t。表明在金铜矿外围及深部仍具有寻找隐爆角砾岩型高品位银铜铅矿体的潜力。 相似文献
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对神木地区山2段和太原组天然气聚集条件的分析发现,神木地区气源条件相对较好,生气强度整体大于16×108 m3/
km2;同时泥岩盖层封盖能力较好,山1段和山2段内的泥岩作为直接盖层,对其下伏地层中的砂岩气藏保存起到了重要作用。山
2段和太原组内储层整体较为致密,按其成岩作用与孔隙组合特征划分出4种类型的成岩相。在成岩相划分的基础上,考虑储层
宏观、微观非均质性和构造等多种因素的差异,确定了致密背景下优势聚集区的特征及其分布。在良好的气源基础上,不同优势
聚集区和泥岩的三维配套组合控制其内天然气的聚集程度,从而造成气藏呈现在三维空间内相邻或叠置的“准连续型”特征。 相似文献
km2;同时泥岩盖层封盖能力较好,山1段和山2段内的泥岩作为直接盖层,对其下伏地层中的砂岩气藏保存起到了重要作用。山
2段和太原组内储层整体较为致密,按其成岩作用与孔隙组合特征划分出4种类型的成岩相。在成岩相划分的基础上,考虑储层
宏观、微观非均质性和构造等多种因素的差异,确定了致密背景下优势聚集区的特征及其分布。在良好的气源基础上,不同优势
聚集区和泥岩的三维配套组合控制其内天然气的聚集程度,从而造成气藏呈现在三维空间内相邻或叠置的“准连续型”特征。 相似文献
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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
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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
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
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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
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《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
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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
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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
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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
18.
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
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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
20.
Plate subduction is the largest natural factory that processes elements, which controls recycling and mineralization of a variety of elements. There are three major ore deposit belts in the world: the circumPaci?c, the central Asian, and the Tethys belts. All the three belts are closely associated with plate subductions, the mechanism remains obscure. We approached this problem from systematic studies on the behaviours of elements during geologic processes. This contribution summaries the recent progress of our research group. Our results suggest that porphyry Cu deposits form through partial melting of subducted young oceanic crust under oxygen fugacities higher than ? FMQ ～+1.5, which is promoted after the elevation of atmospheric oxygen at ca. 550 Ma. Tin deposits are associated with reducing magmatic rocks formed as a consequence of slab rollback. The Neo-Tethys tectonic regime hosts more than 60% of the world's total Sn reserves. This is due to the reducing environment formed during the subduction of organic rich sediments. For the same reason, porphyry Cu deposits formed in the late stages during the closure of the Neo-Tethys Ocean. Tungsten deposits are also controlled by slab rollback, but is not so sensitive to oxygen fugacity. Subduction related W/Sn deposits are mostly accompanied by abundant accessory ?uorites due to the breakdown of phengite and apatite. Decomposition of phengite is also signi?cant for hard rock lithium deposits, whereas orogenic belt resulted from plate subduction promote the formation of Li brine deposits. Cretaceous red bed basins near the Nanling region are favorable for Li brines. Both Mo and Re are enriched in the oxidationreduction cycle during surface processes, and may get further enriched once Mo-, Re-enriched sediments are subducted and involved in magmatism. During plate subduction, Mo and Re fractionate from each other. Molybdenum is mainly hosted in porphyry Mo deposits and to a less extent, porphyry Cu-Mo deposits, whereas Re is predominantly hosted in porphyry Cu-Mo deposits and sedimentary sul?de deposits. 相似文献