初中地理（人教版）第四册彩图说明     

葛文城 《地理教学》1998,(2):31-33

所谓“黑土地”,是指困腐殖质积累高而土色深暗发黑的黑土、黑钙土等．主要分布在三江平原和松嫩平原。这种土壤有机质含量可高达5～15,是华北平原上褐土的3～6倍,太湖平原水稻土的2～3倍．且具有土层疏松、通气透水、保墒性好等特点一是我国最肥沃的土壤。  相似文献   

云贵高原湖泊沉积物碳酸盐和有机质的同位素组成及环境信息记录   总被引：1，自引：0，他引：1  

肖保华 《矿物岩石地球化学通报》1998,(1)

云贵高原湖泊沉积物碳酸盐和有机质的同位素组成及环境信息记录＠肖保华￥中国科学院地球化学研究所高原湖泊,碳酸盐,有机质,碳同位素,地球化学记录,环境气候信息云贵高原湖泊沉积物碳酸盐和有机质的同位素组成及环境信息记录肖保华（中国科学院地球化学研究所,贵阳５５０...  相似文献   

金矿床中的有机质及其有机成矿作用   总被引：1，自引：1，他引：0  

胡凯 《矿物岩石地球化学通报》1998,(2)

金矿床中的有机质及其有机成矿作用胡凯（南京大学地球科学系,南京２１００９３）关键词金矿床有机质有机成矿作用金矿床中有机质的存在及对有机成矿作用的认识早在本世纪初就引起了许多地球化学家的广泛兴趣。Ｆｒｅｉｓｅ［１］和Ｆｅｔｚｅｒ［２］利用从褐煤和富含有...  相似文献   

下古生界海相碳酸盐烃源岩地球化学的研究现状   总被引：9，自引：0，他引：9  

曾凡刚  程克明 《地质地球化学》1998,26(3):1-8

本文对国内外下古生界海相碳酸盐岩研究四个主要方面作了总结：（１）有机质丰度及其影响因素;（２）有机质赋存形式;９３）下古生界海相碳酸协岩有机质丰度和生烃潜力 原理;（４）下古生界海相碳酸盐岩热成熟度研究。这四个方面是评价我 下古生界海相碳酸盐岩勘探剪影至关重要的因素,也是近年来我们研究了下古生界海相碳酸盐岩的热点和难点问题。  相似文献   

松辽盆地白垩纪孢粉颜色指数与有机质成熟度   总被引：3，自引：0，他引：3  

赵传本 《地球化学》1981,(3):301-307

The relatiouship between posen colour and the degree of maturity of organic material is discussed with regard to petroleum formation and evolution as typified by Daqing oil field in Cretaceous system, central Songliao basin, Northeast China. Colour variation of pollen is considered as a function of sedimentary environment and metamorphism. Pollen colour is divided into seven grades and the degree of metamorphism is studied in terms of this colour index. Results show that the pollen colonr index of the strata at depth of 1000-3000m (stratigraphieally from the first section of Liangjiang formation to the upper Quantou formation) ranges from 2.5 to 5, corresponding to an ancient temperature of 60--140℃. This is the most.optimum strata for oil-generation. Strata beneath the lower Quantou formation under 3000 m with colour index in excess of 5 and ancient temperature of over 140℃ should be favorable for gas accumulation. For strata at shallower depth than 100O m, stratigraphically above the second section of Liengjiang formation, which is characterized by a colour index of 1--1.5 and a temperature of lower than 600℃, the maturity degree is lower than that necessary for oil-generation.  相似文献   

黏粒和有机质对黄河口潮间带沉积物微团聚体的影响     

陈友媛  赵文娟  贾永刚  许国辉 《海洋地质与第四纪地质》2009,(1)

微团聚体是形成沉积物结构的基本单元,沉积物的结构性影响了土体的稳定性、渗透性和强度等工程地质性质。对废弃黄河口刁口流路潮间带沉积物微团聚体受黏粒含量、有机质和生物黏液等胶结作用进行分析,结果表明,研究区沉积物多团聚成粉粒级微团聚体(0.05～0.01 mm),含量在85.3%～95.8%之间,与黄土高原土相比,0.05～0.01 mm微团聚体增加,而0.1～0.05 mm微团聚体减少,团聚性差,易于侵蚀;黏粒含量与团聚度表现出显著正相关性,说明黏粒含量增加了沉积物微团聚体的稳定性;沉积物中有机质含量在0.27%～0.61%之间,有机质含量较少,对沉积物微团聚体贡献少;生物扰动的螃蟹洞壁土、螃蟹掘出物的团聚度明显大于表层未受生物扰动土的团聚度,说明螃蟹分泌的黏液能加大微团聚体的稳定性。  相似文献   

Multivariate analysis of fluorescence and source identification of dissolved organic matter in Jiaozhou Bay, China   总被引：1，自引：0，他引：1  

JIANG Fenghu  YANG Baijuan  LEE Frank Sen-Chun  WANG Xiaoru  CAO Xuan 《海洋学报(英文版)》2009,28(2):60-72

Hierarchical clustering analysis and principal component analysis (PCA) methods were used to assess the similarities and dissimilarities of the entire Excitation-emission matrix spectroscopy (EEMs) data sets of samples collected from Jiaozhou Bay, China. The results demonstrate that multivariate analysis facilitates the complex data treatment and spectral sorting processes, and also enhances the probability to reveal otherwise hidden information concerning the chemical characteristics of the dissolved organic matter (DOM). The distribution of different water samples as revealed by multivariate results has been used to track the movement of DOM material in the study area, and the interpretation is supported by the results obtained from the numerical simulation model of substance tracing technique, which show that the substance discharged by Haibo River can be distributed in Jiaozhou Bay.  相似文献   

四川盆地西南缘金坷村剖面五峰组-龙马溪组生物地层划分及区域对比     

王万能  张耀堂  袁永盛  陈庆松  于一帆 《地质与资源》2023,(4):394-405

为了探究上扬子海盆在奥陶纪-志留纪之交的沉积环境、明确四川盆地西南缘金坷村筠连地区有机质页岩沉积层位，通过对金坷村剖面五峰组-龙马溪组岩石地层及生物地层的研究，识别出自晚奥陶世凯迪阶WF2带至早志留世埃隆阶LM6带的9个连续生物带及组合.认为金坷村地区是上扬子海盆最早进入前陆期的地区，时间为鲁丹阶LM1期.金坷村剖面与其北部的新地2井、宁211井、威202井生物地层对比发现，自南向北黑色页岩笔石带上限自LM6延伸至LM9，呈逐渐增高的趋势.金坷村剖面富有机质页岩层位于WF2-LM4带，厚度20.6 m，为该地区页岩气勘探开发提供了一定的基础资料.  相似文献   

腐植烟煤还原性质成因初探     

赵师庆 《地球化学》1985,(4):363-370

腐植煤不同的还原性质，不仅在我国华北聚煤区晚古生代含煤建造的煤层中有明显表现，而且在我国各聚煤区、各成煤时代不同含煤建造的煤层中也均有不同程度的显示。  相似文献   

Water, organic matter, nitrogen and phosphorus contents in sediment of a large-scale mariculture area in the Zhelin Bay of eastern Guangdong Province, China     

DONG Qiaoxiang  LIN Jun  SHANG Xu  LI Jin  HUANG Changjiang 《海洋学报(英文版)》2008,27(2):133-148

The Zhelin Bay is one of the most important bays for large-scale mariculture in Guangdong Province, China. Owing to the increasing human population and the expanding mariculture in the last two decades, the ecological environment has greatly changed with frequent harmful algal blooms. A monthly survey of water content, organic matter （TOM）, and various forms of nitrogen and phosphorous in sediment from July 2002 to July 2003 in the bay was conducted. The results showed that the water content was correlated significantly with TOM and various forms of nitrogen and phosphorus and can be used as proxy for quick and rough estimate of these factors in the future surveys. TOM was also correlated significantly with various forms of nitrogen and phosphorus, indicating that it was one of the key factors affecting the concentrations and distributions of nitrogen and phosphorus in the investigated waters. Average total Kjeldhal nitrogen （TkN） content was（ 1 113.1 ± 382.5）μg/g and average total phosphorus （TP） content was（567.2± 223.3）μg/g, and both were much higher than those of similar estuaries in China and elsewhere. Average nitrogen and phosphorus tended to be higher inside than outside the bay, higher at aquaculture than non-aquaculture areas, and higher at fish-cage culture than oyster culture areas, suggesting that large-scale mariculture inside the bay played an important role in the eutrophication of the Zhelin Bay. Various forms of nitrogen and phosphorus concentrations were higher during the warm season （July--September）, which was due to the increased decomposition and concentration of organic matter resulted from the fast growth and high mortality of the cultured species. Compared with July 2002, TkN and TP contents were much higher in July 2003, in consonance with the eutrophication of the Zhelin Bay. Because exchangeable phosphorus （Ex-P）, iron-bounded phos- phorus （Fe-P） and organic phosphorus （OP） combined accounted for 34.3% of the TP and authigenic phosphorus （Au-P  相似文献