Organic carbon burial forcing of the carbon cycle from Himalayan erosion
Organic carbon burial forcing of the carbon cycle from Himalayan erosion
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DOI：
10.1038/36324
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发表时间：
1997-11-06
期刊：
影响因子：
64.8
通讯作者：
Derry, LA
中科院分区：
文献类型：
--
作者：
FranceLanord, C;Derry, LA
风化和侵蚀可通过硅酸盐风化过程中碳酸的消耗以及有机碳风化和埋藏速率的变化影响二氧化碳的长期海洋-大气收支（1-4）。最近的注意力集中在印度-亚洲碰撞带构造隆起地区硅酸盐风化的增加，这可能是新生代大气CO2水平下降的原因（5-7）喜马拉雅碎屑沉积的主要地点孟加拉扇，可用于估算硅酸盐风化和喜马拉雅隆升有机碳风化埋藏的CO2汇。在这里，我们表明，在喜马拉雅沉积物沉积过程中，来自有机碳净埋藏的新近纪CO2消耗量是喜马拉雅硅酸盐风化作用的2-3倍。因此，上第三系喜马拉雅期侵蚀对碳循环的主要影响是沉积储层中有机碳量的增加，而不是硅酸盐风化通量的增加。
Weathering and erosion can affect the long-term ocean-atmosphere budget of carbon dioxide both through the consumption of carbonic acid during silicate weathering and through changes in the weathering and burial rates of organic carbon(1-4). Recent attention has focused on increased silicate weathering of tectonically uplifted areas in the India-Asia collision zone as a possible cause for falling atmospheric CO2 levels in the Cenozoic era(5-7) The chemistry of Neogene sediments from the main locus of sedimentary deposition for Himalayan detritus, the Bengal Fan, can be used to estimate the sinks of CO2 from silicate weathering and from the weathering and burial of organic carbon resulting from Himalayan uplift. Here we show that Neogene CO2 consumption from the net burial of organic carbon during Himalayan sediment deposition was 2-3 times that resulting from the weathering of Himalayan silicates. Thus the dominant effect of Neogene Himalayan erosion on the carbon cycle is an increase in the amount of organic carbon in the sedimentary reservoir, not an increase in silicate weathering fluxes.