Silicate weathering in anoxic marine sediments
Silicate weathering in anoxic marine sediments
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DOI：
10.1180/minmag.2008.072.1.363
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发表时间：
2008-02
影响因子：
2.7
通讯作者：
K. Wallmann;G. Aloisi;M. Haeckel;P. Tishchenko;G. Pavlova;J. Greinert;S. Kutterolf;A. Eisenhauer-
中科院分区：
文献类型：
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作者：
K. Wallmann;G. Aloisi;M. Haeckel;P. Tishchenko;G. Pavlova;J. Greinert;S. Kutterolf;A. Eisenhauer-
在鄂霍次克海萨哈林岛北坡采集的两个沉积物岩心进行了生物成因蛋白石、有机碳、碳酸盐、硫、主要元素浓度、矿物含量和溶解物质（包括营养物、硫酸盐、甲烷、主要阳离子、腐殖质和总碱度）的分析。矿物丰度的下核趋势表明，斜长石长石和其他活性硅酸盐相（橄榄石、辉石、火山灰）在产甲烷沉积物剖面中转化为蒙脱石。固相中Na/Al、Mg/Al和Ca/Al元素比值随沉积物深度的增加而减小，表明移动阳离子随沉积物深度的增加而减少，蚀变化学指标显著增加。
Two sediment cores retrieved at the northern slope of Sakhalin Island, Sea of Okhotsk, were analysed for biogenic opal, organic carbon, carbonate, sulphur, major element concentrations, mineral contents and dissolved substances including nutrients, sulphate, methane, major cations, humic substances and total alkalinity. Down-core trends in mineral abundance suggest that plagioclase feldspars and other reactive silicate phases (olivine, pyroxene, volcanic ash) are transformed into smectite in the methanogenic sediment sections. The element ratios Na/Al, Mg/Al and Ca/Al in the solid phase decrease with sediment depth indicating a loss of mobile cations with depth and producing a significant down-core increase in the chemical index of alteration.