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1.
通过对山西省寺沟铜矿地质特征的分析,认为该铜矿主要控矿因素为褶皱构造和斜长角闪岩(变基性火岩),其中褶皱构造控制矿体形态,斜长角闪岩提供主要的矿源。为该矿区找矿提供详实依据。 相似文献
2.
辽宁结晶基底斜长角闪岩为贫碱低铝型斜长角闪岩,从鞍山期至辽河期斜长角闪岩基性度循序增高,主元素地球化学模型显示基底层和幔岩层之间的过渡特点。鞍山群斜长九闪岩微量元素主要分3大群;辽河群斜长角闪岩微量元素分2大群。其原岩主要为基性岩浆岩,少数为钙泥质沉积岩。该类岩石为 Ag、Co、Cu、Zn、Au 等成矿元素的主要荷载岩石。 相似文献
3.
长城系巴什库尔干群斜长角闪岩主要分布于阿尔金构造带西段北缘,一般呈似层状、透镜体状夹于云母石英片岩、变粒岩、石英岩、黑云二长片麻岩、大理岩等中。通过岩石学、岩石化学、微量元素和稀土元素地球化学研究表明,该斜长角闪岩的原岩为中-基性火山岩类,并形成于两种构造环境:一种斜长角闪岩的球粒陨石标准化配分曲线显示出LREE明显富集,具有类似大陆(板内)裂谷火山岩特有的稀土元素组成特征;另一种斜长角闪岩的球粒陨石标准化配分曲线呈略富集(近平坦)型,与洋中脊玄武岩类非常相似。表明在长城纪时期,阿尔金构造带西段北缘主要处于板内大陆裂谷环境,随着大陆裂谷的进一步扩张,局部地区已形成初始洋盆环境。 相似文献
4.
本文对陈蔡群变质岩中的斜长用闪岩进行了地球化学研究。常量元素、微量元素和稀土元素的特征表明陈蔡群变质岩中存在两种不同成因的斜长角闪岩，其一是正角闪岩，由拉斑玄武质岩石变质形成；其二是副变质成因的角闪岩，其原岩为白云质泥灰岩。进一步的地球化学研究，揭示出正斜长角闪岩的成岩构造环境类似于大陆边缘环境。 相似文献
5.
威海地区榴辉岩位于秦岭大别苏北胶南巨型榴辉岩带的北东段。榴辉岩体大小悬殊,呈透镜状、不规则状、脉状及似层状等赋存在早元古代荆山岩群变质层状岩系、尖晶石橄榄透闪片岩及晚元古代片麻状花岗闪长岩、片麻状二长花岗岩中,并与围岩一起经受了后期的构造变形改造。榴辉岩退变分带的核部为榴辉岩,次外边为榴闪岩,最外边为斜长角闪岩或石榴斜长角闪岩。三个变质作用阶段的特征是：前榴辉相阶段为中压相系绿帘角闪岩相;榴辉岩相阶段为高压相系;榴辉岩退变质阶段相当于中压相系的角闪麻粒岩相—角闪岩相。变质作用ＰＴｔ轨迹呈顺时针方向。榴辉岩形成于９００Ｍａ左右。 相似文献
6.
塔什库尔干县马尔洋乡大河口一带发育灰绿色斜长角闪岩,全岩地球化学分析结果显示其属于钙碱性系列,原岩为基性火山岩,形成于会聚阶段的板块边缘。锆石LA-ICP-MS U-Pb年龄为512±3.8 Ma,揭示其形成时代为早古生代,与区域上康西瓦构造结合带的形成同期。据此推断,大河口斜长角闪岩的形成与古特提斯洋演化密切相关,是原特提斯洋俯冲消减的产物。 相似文献
7.
程裕淇确定了泰山岩群雁翎关组、山草峪组、柳杭组地层划分,在斜长角闪岩中发现残存的变余杏仁状构造和岩流特征,正确区分了变基性熔岩流、变火山凝灰质岩和变基性脉体。原化马湾组黑云斜长片麻岩为新太古代早期条带状英云闪长质片麻岩。富山背斜的片麻状奥长花岗岩锆石SHRIMP U-Pb年龄(2 612±20)Ma,其侵入的具变余气孔状充填构造的斜长角闪岩属于雁翎关组;而李家庄倒转向斜核部的柳杭组含砾黑云变粒岩中最年轻的碎屑锆石SHRIMP U-Pb年龄(2524±7)Ma。 相似文献
8.
陕西潼关地区太华群变质岩原岩性质的恢复 总被引：1，自引：0，他引：1
潼关地区太华群地层是一套以角闪岩相为主(局部达麻粒岩相)的中深变质岩系。本区太华群变质岩的主要岩石类型:斜长片麻岩类的原岩为中酸性火山岩(二长安山质、英安质凝灰岩);浅(变)粒岩类的原岩为中酸性火山岩(英安岩,流纹岩)一中酸性火山碎屑岩(二长安山质、英安质凝灰岩),并以后者为主,还有少量粘土质沉积岩或长石质杂砂岩;斜长角闪岩的原岩为基性火山岩—拉斑玄武岩。 相似文献
9.
作者通过对红花沟金矿各主要岩石类型及金矿石稀土元素丰度的分析测定,探讨了本区的稀土地球化学特征。研究表明:太古代变质岩、元古代花岗岩、中生代花岗岩及花岗斑岩、流纹岩和凝灰岩、第三纪玄武岩及金矿石的稀土配分曲线均为右倾斜型,即富轻稀土,都有十分相似的 Ce 负异常。变质岩、元古代花岗岩和玄武岩显示Eu 正异常,其它岩石和矿石显示 Eu 负异常。牛营子岩体显示较强的 Eu 负异常,且稀土总量明显高于元古代花岗岩。元古代的花岗岩源岩可能为石榴石角闪岩。金矿与斜长角闪岩关系最为密切,斜长角闪岩可能是形成金矿的矿源层。 相似文献
10.
具有黑云母压象的变形岩石样品采自排山楼金矿区的糜棱岩带内。排山楼金矿床赋存于太古宙建平群中的东西向韧性剪切(变形)带内,建平群具有太古代绿岩带结构特征。下部小塔子沟组,岩石组合为斜长角闪岩、辉石斜长片麻岩、黑云紫苏麻粒岩、二辉麻粒岩、阳起黑云斜长片麻岩、黑云斜长片麻岩夹磁铁石英岩。中部大营子组,岩石组合为黑云斜长片麻岩、角闪斜长片麻岩、角闪斜长变粒岩、浅 相似文献
11.
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
12.
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
13.
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
14.
《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
15.
16.
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
17.
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.
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
19.
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.
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