我国东海大陆架沉积物中有机粘土复合体与某些金属元素富集关系的研究

Samples of Continetal shelf sediments from the East China Sea have been studied in an attempt to eluciate the relationship of metallie element enrichment with organoclay complexes. Investigations of the distribution patterns and modes of existence of such elements as Cu, Pb, Zn, Ni, Fe, Mn, etc. in the sediments demonstrate that there exist remarkable positive eorrelations between tha distribution of all elements except for Mn,and the content of clay minerals and organic matter and its type. Experimental results show that the removal of combined organic matter will lead to a rapid decrease in the content of these elements (up to mote than 50%). Organoelay chemistry study indicates that the enrichment of metallic elements in the sediments may involve the following processes: (1) the formation of organic metallic complexes by the ineraction between organic matter and metallic ions in the water body; (2) the production of organoclay complexes by the interaction between the organic metallic complexes and clay minerals in the same medium, (3) the deposition of the organoelay complexes due to the variation of water medium conditions during their migration, thus enabling the sediments to be enriched in some metallic elements. From the above, it can be seen that organoclay complexes may be one of the important forms of existense of metallic elements concentrated in the sediments, and also of significance in eluciating the mechanism of fineralization of metallic elements.     

有机粘土复合体与东海大陆架细粒沉积区的关系

我国东海大陆架沉积类型分布状况,经过有关部门和单位的多次海洋地质调查,已获得了丰富的资料和成果。秦蕴珊等同志根据沉积物的中位直径(Md),将东海沉积物大体分成三带:第一带是近陆浅水区的细粒沉积物带;第二带是外陆架的粗粒沉积物带;第三带是大陆坡细粒沉积物带。他们认为这种分布是与东海大陆架所经历的海陆变迁有关,并详尽     

我国南海北部湾第三系粘土岩中有机物的赋存状态及其与生油关系的探讨

The chemistry of organo-clay in somc Tertiary clay-stones from the northern part of the South China Sea was studied. The preliminary results are summarized as follows : (1) Three basic types of organic matter are distinguished in the claystones after treated with different chemical agents: spluble, combined and insoluble (kerogen). It is suggested that the distribution of organic matter and its conversion to petroleum are closely related with the composition and structure of expansive clay minerals in the claystones. Therefore, more detailed studies of these expansive clay minerals may provide new indices for oil-generating potentiality. (2) It is considered from the study of the state of existence of organic matter and. of organo-clay complexes in tile clay-stones that the accumulation and preservation of organic substances may substantially take the form of organo-clay complexes in the process of sedimentation and burial and that the organo-clay complexes may make considerable contributions to the formation of petroleum hydrocarbons during diagenesis. Studies in this aspect are of great significance in developing new theories conccrning petroleum generation and in localizing oil-generating occurrences.     

海洋沉积物中有机粘土复合体的研究和应用

有机粘土复合体是有机物与粘土(或粘土矿物)相互作用形成的化学键合产物.其键合方式主要有:1.正电荷有机分子与粘土矿物表面起平衡作用的阳离子发生阳离子交换作用;2.偶极有机分子和阴离子有机物与粘土矿物表面的阳离子水化壳的水分子结合(或称水桥结合);3.带羟基阴离子交换粘土矿物八面体中Al、Fe配位的羟基(OH),即配位基交换.这种反应大多在水体系中进行.因此,这种复合体在地表和海洋沉积物中广泛发育.如何研究海洋沉积物中的有机粘土复合体及其意义,是海洋地质科学所关注的新课题.本文试图通过东海大陆架和南海北部湾有关站位的沉积物样品(图1)有机粘土复合体的研究