WebThe relationship between Na2O and K2O with the Ishikawa alteration index refers to the data plot close to chlorite/sericite. Also, based on alteration box plotting (Ishikawa alteration index vs. chlorite-carbonate-pyrite index), they mostly plotted in the field of the hydrothermal alteration close to chlorite and pyrite minerals with more ... WebOct 5, 2024 · The distribution of Ishikawa Alteration Index (AI, see chapter 4 for further details) has been gridded and contoured throughout the study area using the Natural Neighbor interpolation method available in Surfer software code . We opted for this method because it provides reliable results with data sets that have an inhomogeneous …
11. Hydrothermal Alteration - USGS
WebApr 23, 2024 · The alteration box plot by is x–y bivariate plot with Ishikawa alteration index (AI) plot in X-axis and chlorite-carbonate-pyrite index (CCPI) plot in Y-axis. The diagram exhibits hydrothermal alteration assemblages from diagenetic albite- or albite + K-feldspar-bearing assemblages. The position of least-altered volcanic rocks plot within a ... WebNov 1, 2002 · Zonal alteration is a common feature in volcanic rocks surrounding sea-floor massive sulfide deposits. Alteration indexes, such as the Ishikawa alteration index (AI) and the chlorite-carbonate-pyrite … Expand. 352. PDF. View 1 … clitheroe bathroom centre reviews
3D modelling of hydrothermal alteration associated with VHMS
WebOver the last decades, several lithogeochemical techniques have been proposed to characterize the hydrothermal alteration, namely alteration indexes such as the i) Ishikawa Alteration Index (AI), proposed to measure the intensity of sericitic and chloritic alteration in the footwall of VMS deposits - it is defined as: [100(K2O+MgO)/(K2O+MgO ... WebIn arc-related systems, contrasting water depths in massive sulfide formation exert a major control on the ore and hydrothermal alteration mineral assemblages and the metalliferous contents ... WebMar 13, 2024 · The light green volume shows the 0.001 SI magnetic susceptibility 3D model. Zones of intense hydrothermal alteration (an Ishikawa alteration index greater than 80) are modeled as light blue ... clitheroe bathroom shop