Geochemistry of surface sediments off the southern and western coasts of Korea
Geochemistry of surface sediments off the southern and western coasts of Korea
复制标题
DOI：
10.1016/s0025-3227(98)00194-7
复制
发表时间：
1999-07
期刊：
影响因子：
2.9
通讯作者：
Yeong-Gil Cho;Chang-Bok Lee;Man-Sik Choi
中科院分区：
文献类型：
--
作者：
Yeong-Gil Cho;Chang-Bok Lee;Man-Sik Choi
朝鲜半岛南部和西部的大陆架是现代陆表海的一部分，是来自中国和朝鲜的碎屑物质的有效沉积物圈闭。为了确定这些沉积物的地球化学特征，我们分析了179个陆架表层沉积物样品的Al、Fe、Na、K、Mg、Ca、Ti、P、Mn、Sr、Ba、V、Cr、Co、Ni、Cu、Zn、有机碳和碳酸钙。结果表明，沉积物中元素含量变化幅度较大，这主要与沉积物的结构变异性有关。Ca、K、Sr和Ba的含量则是例外。Ca和Sr的含量主要由碳酸盐的含量决定。另一方面，钾含量似乎受伊利石和长石含量以及钾长石中Ba含量的影响。对于淤泥（即在当今条件下沉积的沉积物），可以将黄海中部的淤泥与锦河口的淤泥区分开来：前者的特征是铁、钠、钾、镁、钙和钒含量高，后者的特征是锰、钡和钴含量高。当这些元素相对于铝进行归一化时，这些差异变得更加明显，以尽量减少粒度的影响。V/Al比值的分布与其他元素不同：最高的V/Al值出现在黄海中部源自黄河的泥浆中，而最高的Mn/Al值出现在靠近朝鲜半岛的近岸地区。在此基础上，认为可以通过表层沉积物的地球化学特征来区分黄海和南海细粒沉积物的来源。在黄海，可以看到两种不同的细颗粒沉积物来源，黄河和锦河。前者具有较高的V含量，后者具有较高的Mn含量。利用V/Al比值作为两种源物质的端元组分，推导了细粒沉积物（>6Ø）的扩散模式。
The continental shelf off the southern and western side of the Korean Peninsula is part of a modern epicontinental sea, and is an effective sediment trap for clastic material derived from China and Korea. We have analyzed 179 surface sediment samples from this shelf for Al, Fe, Na, K, Mg, Ca, Ti, P, Mn, Sr, Ba, V, Cr, Co, Ni, Cu, Zn, organic carbon and calcium carbonate in order to determine the geochemical characteristics of these sediments. Results showed a wide range of element contents which are mainly related to the textural variability of sediments. Exceptions to this were found in the contents of Ca, K, Sr and Ba. The Ca and Sr contents were largely determined by the amounts of carbonate present. The K content, on the other hand, appeared to be influenced by both the contents of illite and feldspar, and Ba, of potassium feldspar. For muds (i.e., sediments deposited under present-day conditions), it is possible to distinguish those in the central Yellow Sea from those in the Keum Estuary: the former are characterized by high contents of Fe, Na, K, Mg, Ca and V, and the latter by high contents of Mn, Ba and Co. These differences become more apparent when these elements are normalized relative to Al in order to minimize grain size effects. The distribution of V/Al ratios is different from that of other elements: the highest V/Al values occur in muds from the central Yellow Sea derived from the Huanghe (the Yellow River in China), whereas the highest values of Mn/Al are found in the nearshore area adjacent to the Korean Peninsula. Based on these results, it is suggested that the sources of fine sediments in the Yellow and South Seas can be distinguished from the geochemical characteristics of the surface sediments. In the Yellow Sea, two different sources of fine-grained sediments can be seen, the Huanghe and the Keum River. The former is characterized by higher V contents and the latter by higher Mn contents. Using the V/Al ratio as an end-member component of the two source materials, the dispersal patterns of the fine sediments (>6Ø) were also derived.