Geochemistry of the Amazon: 2. The influence of geology and weathering environment on the dissolved load
Geochemistry of the Amazon: 2. The influence of geology and weathering environment on the dissolved load
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DOI：
10.1029/jc088ic14p09671
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发表时间：
1983-11
影响因子：
--
通讯作者：
R. Stallard;J. Edmond
中科院分区：
文献类型：
--
作者：
R. Stallard;J. Edmond
在亚马逊盆地，基底岩性和侵蚀状态（从运输受限和风化受限剥蚀角度来看）对集水区地表水的化学成分起着最根本的控制作用。次生效应，如土壤和河床中盐的沉淀、生物吸收和释放以及盐的循环输入，则更难以辨别。根据总阳离子电荷（TZ+）与地质的关系，样品可分为四大类。(1) 0 3000 μeq/l的河流大量蒸发。这些河流富含钠和氯。在第三类和第四类中，河流往往具有1:1（等效）的Na:Cl和（Ca+Mg）：（碱度+SO4）的比例，这主要是由碳酸盐和蒸发岩的风化作用造成的。补充可与整个文章在缩微胶卷。美国地球物理联合会订购，2000佛罗里达大道，N.W，华盛顿特区20009。文档c83 - 002;2.50美元。付款必须随订单一起支付。
In the Amazon Basin, substrate lithology and erosional regime (seen in terms of transport-limited and weathering-limited denudation) exert the most fundamental control on the chemistry of surface waters within a catchment. Secondary effects, such as the precipitation of salts within soils and in stream beds, biological uptake and release, and cyclic salt inputs, are more difficult to discern. Samples can be separated into four principal groupings based on relationships between total cation charge (TZ+) and geology. (1) Rivers with 0 3000 μeq/l drain massive evaporites. These rivers are rich in Na and Cl. In the third and fourth categories, rivers tend to have 1:1 (equivalent) ratios of Na:Cl and (Ca+Mg):(alkalinity+SO4), caused primarily by the weathering of carbonates and evaporites. Supplement available with entire article on microfiche. Order from the American Geophysical Union, 2000 Florida Avenue, N.W., Washington, DC 20009. Document C83-002; $2.50. Payment must accompany order.