迄今为止,前人已在位于大洋中脊、海山以及弧后盆地热液活动区的部分块状硫化物矿床中发现有大量自然金、银金矿和自然银产出(Hannington et al.,1986,1991,1995;Herzig et al.,1993;Murphy&Meyer,1998;Moss&Scott,2001;Peterse...迄今为止,前人已在位于大洋中脊、海山以及弧后盆地热液活动区的部分块状硫化物矿床中发现有大量自然金、银金矿和自然银产出(Hannington et al.,1986,1991,1995;Herzig et al.,1993;Murphy&Meyer,1998;Moss&Scott,2001;Petersen et al.,2002)。但总体而言,Au-Ag系列独立矿物在大多数沿快速-中速扩张洋脊分布。展开更多
This paper explores how dissolution and precipitation reactions are coupled in batch reactor experimental systems at elevated temperatures. This is the fifth paper in our series of ‘‘Coupled Alkali Feldspar Dissolut...This paper explores how dissolution and precipitation reactions are coupled in batch reactor experimental systems at elevated temperatures. This is the fifth paper in our series of ‘‘Coupled Alkali Feldspar Dissolution and Secondary Mineral Precipitation in Batch Systems.'' In the previous four papers we presented batch experiments of alkali-feldspar hydrolysis and explored the coupling of dissolution and precipitation reactions(Fu et al. in Chem Geol91:955–964, 2009; Zhu and Lu in Geochim Cosmochim Acta 73:3171–3200, 2009; Zhu et al.in Geochim Cosmochim Acta 74:3963–3983, 2010; Lu et al. in Appl Geochem30:75–90, 2013). Here, we present the results of additionalK-rich feldspar hydrolysis experiments at 150 °C. Our solution chemistry measurements have constrained feldspar dissolution rates, and our high resolution transmission electron microscopy work has identified boehmite precipitation. Reaction path modeling of K-feldspar dissolution and boehmite precipitation simulated the coupled reactions, but only with forced changes of boehmite rate law in the middle of experimental duration. The results which are reported in this article lend further support to our hypothesis that slow secondary mineral precipitation explains part of the wellknown apparent discrepancy between lab measured and field estimated feldspar dissolution rates(Zhu et al. in Water–rock interaction, 2004).展开更多
文摘迄今为止,前人已在位于大洋中脊、海山以及弧后盆地热液活动区的部分块状硫化物矿床中发现有大量自然金、银金矿和自然银产出(Hannington et al.,1986,1991,1995;Herzig et al.,1993;Murphy&Meyer,1998;Moss&Scott,2001;Petersen et al.,2002)。但总体而言,Au-Ag系列独立矿物在大多数沿快速-中速扩张洋脊分布。
基金grant from the State Key Laboratory of Ore Deposits at the Institute of Geochemistry, Chinese Academy of Sciences
文摘This paper explores how dissolution and precipitation reactions are coupled in batch reactor experimental systems at elevated temperatures. This is the fifth paper in our series of ‘‘Coupled Alkali Feldspar Dissolution and Secondary Mineral Precipitation in Batch Systems.'' In the previous four papers we presented batch experiments of alkali-feldspar hydrolysis and explored the coupling of dissolution and precipitation reactions(Fu et al. in Chem Geol91:955–964, 2009; Zhu and Lu in Geochim Cosmochim Acta 73:3171–3200, 2009; Zhu et al.in Geochim Cosmochim Acta 74:3963–3983, 2010; Lu et al. in Appl Geochem30:75–90, 2013). Here, we present the results of additionalK-rich feldspar hydrolysis experiments at 150 °C. Our solution chemistry measurements have constrained feldspar dissolution rates, and our high resolution transmission electron microscopy work has identified boehmite precipitation. Reaction path modeling of K-feldspar dissolution and boehmite precipitation simulated the coupled reactions, but only with forced changes of boehmite rate law in the middle of experimental duration. The results which are reported in this article lend further support to our hypothesis that slow secondary mineral precipitation explains part of the wellknown apparent discrepancy between lab measured and field estimated feldspar dissolution rates(Zhu et al. in Water–rock interaction, 2004).
