Chemical alteration and mineral growth under high pCO₂ conditions: Insights from the mineral chemistry of carbonate phases in the Caprese Reservoir (Northern Apennines, central Italy)

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• 作者：Gabriele Bicocchi^a ; ^{gabriele.bicocchi@unifi.it} ; Orlando Vaselli^a ; ^b ; Giovanni Ruggieri^b ; Marco Bonini^b ; Franco Tassi^a ; ^b ; Antonella Buccianti^a ; ^b ; Francesco di Benedetto^a ; ^b ; Giordano Montegrossi^b
• 关键词：Carbon cycle ; Natural analogs of CO2 reservoirs ; Water-gas-rock interactions ; Ca-Fe-Mg carbonates
• 刊名：Chemical Geology
• 出版年：2017
• 出版时间：5 February 2017
• 年：2017
• 卷：450
• 期：Complete
• 页码：81-95
• 全文大小：2051 K
• 卷排序：450

文摘

Drill-core samples from the deep CO2-rich Caprese Reservoir (central Italy, Northern Apennines) were studied. The former volcanic mineral assemblage was replaced by carbonates, illite and quartz. Interactions with H2O- and CO2-rich fluids were responsible of the new mineral assemblage. Regrowth of ankerites on calcites is related to the uptake of Fe and Mg in the crystal at the P-T conditions of formation. Carbonates zonation reflected the different Fe/Mg ratios controlled by kinetics and pCO2 oscillations.