BASIC GEOCHEMICAL CHARACTERISTICS OF SEDIMENTS IN THE OKINAWA TROUGH

A total of 21 elements, Si, Al, K, Na, Ca, Mg, Fe, Mn, Ti, P, Cu, Co, Ni, Zn, Pb, Cr, Rb, Sr Ba, Cd and Corg(organic carbon), was determined in the trough. Average contents of most elements were found to be higher in the trough bottom than in the western and eastern slopes. We call these elements the indicator elements because of their "transition" property. This is in keeping with the "intermediate" geographical position of the trough where the continental crust turns to oceanic crust.Though the authigenic fraction of some elements here increases, the detrital fraction .of most elements is still dominant, indicating that the influences of terrigenous and volcanic detrital materials on the trough sediments are still dominant.The abundant biogenous component in the trough is characterized by the increase of Ca, Sr and Corg contents. Ca existes mainly in the form of CaCo3 that is mostly found in various shells. Sr often easily replaces Ca within the shells.A belt-shaped distribution pattern of elements wa     

海州湾南岸的沉积特征与动态

海州湾位于苏北,其南岸(灌河口至临洪口)是一段极有趣的海岸,它几经黄河改道的影响,由原来的沙质、基岩港湾海岸改变为淤泥质海岸,现在正遭受严重冲刷破坏,致使湾顶区产生淤积。从全球角度来看,淤泥浅滩一般发育在沙坝后面或隐蔽的海湾顶部,而海州湾面向开阔外海,毫无任何阻挡,却广泛发育着淤泥质潮间浅滩,实属罕见。因而这段海岸对研究海岸带的形态与动态过程具有十分重要的意义。其次,这段海岸又位于     

中国大陆架海底沉积物中的稀土元素

选择渤海、黄海、东海和南海有代表性的大陆架沉积物样品,利用X射张荧光光谱法测定了15个稀土元素。中国大陆架沉积物稀土元素的丰度为156ppm,相对接近于中国黄土和花岗岩的丰度,而与太平洋沉积物的丰度相差较远,具有明显的“亲陆性”。稀土的配分模式旦显著的负斜率,属陆壳稀土的典型特征。稀土含量受沉积物粒度控制。实验表明稀土主要以类质同像存在于粘土矿物之晶体构造中。根据数理统计,稀土与亲陆源粘土矿物的元素为一类,彼此呈正相关;与亲海洋生物的元素为负相关。事实说明中国大陆岩石的风化和搬运,是中国海大陆架沉积物中稀土的主要物质来源。     

ON THE SOURCE AND GENESIS OF THE MUD IN THE CENTRAL AREA OF THE SOUTH YELLOW SEA

Investigations and studies for years all demonstrated that there is a patch of fine-grained mud in the central area of the South Yellow Sea. However, scientists have different opinions on its material source, genesis, and sedimentation intensity. Some believe that the materials come from the Huanghe River, some think that the mud area represents the depocentre of the South Yellow Sea, and some consider it as "relict mud ". The authors ' geochemical study reveals that the mud is multi-sourced, yet the material supply is not ample, and that a little amount of fine-grained suspended materials deposited slowly under the dynamic action of a cyclonic gyre formed the modern muddy sediment, which is named "multi-source modern mud ".     

中国海底沉积物中金的丰度

为了促进大陆金矿地质的研究,查明现代海洋沉积物中金的丰度,无疑有所裨益,为此,本文首次报道了中国海底沉积物中金的丰度。     

震旦系地质时代的讨论

自从震旦系这一地质名词建立以来,各国学者在国外虽有相当地层的发现,但是由于国际地层表中没有一个统一的与之相应的术语,以致在不同的国家,甚至在同一个国家的不同地区就出现了不同的名称。特别是关于其地质时代问题,各家的意见更是众说纷     

对华北山西式铁矿与G层铝土矿的成因及其时代的意见

一、问题的提出山西式铁矿与G层铝土矿,早已载入了我国地质文献。但是对其成因和时代,以往还没有人作过专门性的详细讨论。近两年来,虽然已有人作了初步的探讨,可是还没有一个完满的答案。1956年夏,笔者到山西太原收集毕业论文的资料     

中国台湾浅滩海底沉积物中铁、锰、钛、磷元素的地球化学

台湾浅滩位于台湾海峡之南端,地跨东海与南海之间。由于渔场的调查,曾系统地进行了海底沉积物的采样。为了查明现代海洋大陆架沉积物中铁、锰、钛和磷等元素的若干地球化学问题,我们曾对台湾浅滩及其周围43个有代表性的样品进行了化学分析。所用方法均为通用的分光光度法,即磺基水杨酸法测定铁;高碘酸钾法测定锰;过氧化氢法测定钛;钒钼酸铵法测定磷。     

A STUDY ON ELEMENT-STRATIGRAPHY OF OKINAWA TROUGH

Regular distribution patterns of elements Ca, Sr, K, Na, Mg, Fe, Mn, Ti, Cu, Co, Ni,Zn, Ph, Cr, Rb, Ba, Cd, and U in Late Quaternary strata have been studied in detail. The regional variation patterns of elements in these strata are similar to those in recent surface sediments, showing that the sedimentary environment has been relatively stable since Late Quaternary. Element distribution changes with the variations of lithologtcal characters. Contents of Ca and Sr increase in coarse sediments, while those of other elements decrease. Na content increases in the pumice layer, Mn content tends to increase sharply towards the surface layer. Ca content decreases sharply in strata where water depth is more than 2,000m.The strata can be divided based on the distribution curves of element assemblages. The variations in contents of most elements in Holocene Series are smaller than those in Late Pleistocene Series, which might be related to the factors of glacial and interglacial changes, sea level fluctuations a     

南黄海浅层声学地层的初步探讨

利用数字地震仪、地质脉冲仪和3.5kH_Z真浅层剖面仪测量结果显示:南黄海地层可分为三个大层组,即第四系、上第三系和下第三系(或第三系以前的地层)。它们分别沉积在南、北两个沉积中心中,这两个沉积中心始终控制着盆地的沉积。在盆地发展过程中,西部大陆的物质一直是盆地沉积的主要物质来源。第四纪时,黄河已经显示了它对南黄海影响的主导地位。无论是第三纪还是第四纪沉积物均以陆相为主。第四纪的地质历史是复杂多变的,至少有两次以上的成陆过程。