Geochemistry of high-pH waters from serpentinites of the Gruppo di Voltri (Genova, Italy) and reaction path modeling of CO2 sequestration in serpentinite aquifers
Geochemistry of high-pH waters from serpentinites of the Gruppo di Voltri (Genova, Italy) and reaction path modeling of CO2 sequestration in serpentinite aquifers
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DOI：
10.1016/j.apgeochem.2003.10.007
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发表时间：
2004-05-01
影响因子：
3.4
通讯作者：
Zuccolini, MV
中科院分区：
文献类型：
--
作者：
Cipolli, F;Gambardella, B;Zuccolini, MV
在Gruppo di Voltri泉水上收集的大量地球化学数据证实，受蛇纹岩作用影响不同的大气水与超镁铁质岩石的渐进相互作用最初导致系统对二氧化碳开放时形成镁HCO3水，当与岩石进一步相互作用时，在相对于二氧化碳高度还原的闭合系统条件下，形成Na-HCO3和Ca-OH型水。如H-3数据所示，这些高pH值的水在地下以蛇纹岩为主的深层含水层中有很长的停留时间。这些水域是唯一可用的证据，证明存在这样的深层含水层。通过反应路径模拟，模拟了二氧化碳高压注入这些深层含水层。结果表明，这是一种减少大气中人为二氧化碳输入的可行方法。蛇纹岩具有很高的二氧化碳封存能力，主要是通过碳酸盐矿物的形成。蛇纹岩的溶解和菱镁矿和二氧化硅矿物的沉淀自然发生在陆地二氧化碳通量高的地区，如托斯卡纳南部，证实了这种二氧化碳封存方法的可行性。然而，这一过程导致含水层孔隙度逐渐减少，至少在封闭系统条件下是这样。必须通过进一步的实验室测试和实地活动仔细评估这些副作用。(C)2003爱思唯尔有限公司。保留所有权利。
The large number of geochemical data gathered on the Gruppo di Voltri springs confirm that progressive interaction of meteoric waters with ultramafic rocks variably affected by serpentinization leads initially to the formation of Mg-HCO3 waters when the system is open to CO2, and Na-HCO3 and Ca-OH type water upon further interaction with the rock, under highly reducing closed-system conditions with respect to CO2. As indicated by H-3 data, these high-pH waters have had long residence times underground in deep aquifers hosted by serpentinitic rocks. These waters are the only available evidence of the presence of such deep aquifers. High-pressure injection Of CO2 into these deep aquifers was simulated by reaction path modeling. Results indicate that this is a feasible methodology to reduce the inputs of anthropogenic CO2 into the atmosphere. Serpentinitic rocks have a high capacity for CO2 sequestration, mainly through formation of carbonate minerals. Dissolution of serpentinitic rocks and precipitation of magnesite and silica minerals occurs naturally in areas of high terrestrial CO2 fluxes such as in southern Tuscany, corroborating the feasibility of this methodology Of CO2 sequestration. However, this process causes a progressive decrease in the porosity of the aquifer, at least under closed-system conditions. These side effects must be carefully evaluated by means of further laboratory tests and field activities. (C) 2003 Elsevier Ltd. All rights reserved.