Monitoring climatological, hydrological and geochemical parameters in the Père Noël cave (Belgium): implication for the interpretation of speleothem isotopic and geochemical time-series
Monitoring climatological, hydrological and geochemical parameters in the Père Noël cave (Belgium): implication for the interpretation of speleothem isotopic and geochemical time-series
复制标题
监测 Père Noël 洞穴（比利时）的气候、水文和地球化学参数：对解释洞穴同位素和地球化学时间序列的意义
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
E. Keppens
中科院分区：
文献类型：
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作者：
S. Verheyden;D. Genty;Guy Deflandre;Y. Quinif;E. Keppens
Pere诺埃尔洞穴气候学（空气和水温，P CO2），水文学（滴水率，电导率）和水和方解石沉积物的地球化学（δ 18 O，δ 13 C，Mg/Ca和Sr/Ca）进行了研究，以更好地解释洞穴沉积物的稳定同位素和微量元素变化。1991年至1998年期间，自动监测站和人工取样的结果表明，滴水率具有高度季节性信号，其受水过剩和降雨的控制，并在较短的尺度上受气压变化的控制。现代方解石存款研究表明，洞穴方解石同位素组成（δ 18 O和δ 13 C）和滴水率之间的关系可能是由于方解石沉淀过程中的同位素平衡程度的变化。因此，方解石的δ 18 O和δ 13 C通过滴水速率与水的补给有关。Pere诺埃尔洞穴方解石的Mg/ Ca和Sr/Ca比值与水的停留时间密切相关，因此也与滴水速率有关，因此也与水补给有关。δ 18 O和δ 13 C与Mg/Ca和Sr/Ca的这种交叉联系可以解释这四个参数沿全新世石笋纵轴沿着的非常相似的变化，但这也可能是方解石沉淀过程中动力学效应的结果，如这四个参数沿全新世石笋单层沿着的相似变化所表明的。
Pere Noel cave climatology (air and water temperature, P CO2), hydrology (drip rate, conductivity) and geochemistry of water and calcite deposits (δ 18O, δ 13C, Mg/Ca and Sr/Ca) where studied to better interpret stable isotopic and trace element variations of speleothems. Results of an automated monitoring station and of manual sampling between 1991 and 1998 have demonstrated the highly seasonal signal of drip rate, its control by water excess and rainfall, and, at a shorter scale to air pressure changes. The modern calcite deposit study suggests a relationship between cave calcite isotopic composition (δ 18O and δ 13C) and drip rate likely due to variations in degree of isotopic equilibrium during calcite precipitation. δ 18O and δ 13C of the calcite are therefore, through drip rate, linked to water recharge. Mg/ Ca and Sr/Ca ratios of Pere Noel cave calcite, depend closely on the residence time of the water, and therefore are also linked to drip rate and therefore to water recharge. This crossed link of δ 18O and δ 13C as of Mg/Ca and Sr/Ca to water recharge may explain the very similar variations of these four parameters along the longitudinal axis of a Holocene stalagmite, but it may also be the consequence of kinetic effects during calcite precipitation as suggested by similar variations of the four parameters along a single layer of the Holocene stalagmite.