Ishikawa alteration index
Webalteration mineral assemblage zones. The first step in building the model involves simple viewing of the geochemical data in 3D. Figure 3 shows the locations of the sample analyses with colours indicating the rock type, and the size of the spot is determined by the Alteration Index (Ishikawa et al. 1976). This region is heavily altered, and ... WebMar 13, 2024 · The center line of the slice is oriented along an azimuth of 340 degrees, oblique to the UTM grid and rotated 20 degrees from the viewing plane. 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 volumes.
Ishikawa alteration index
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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 ... WebGeological and radiometric studies of outcrops aided by extensive subsurface exploration through drill holes in an otherwise soil-covered terrain revealed the existence of low grades, medium tonnage, and metasomatite types of polymetallic uranium deposits at Rohil in India. Microscopic studies, electronprobe micro analyses, and geochemical analyses of …
WebAlteration Index and Depth Ratios at the Northwest Zone of the Lemarchant ... Ishikawa alteration index (AI), Ba/Sr, and low Na 2O values and elevated SiO 2 and K 2O, Fe 2O 3, Na 2O, and BaO contents, similar to global alteration signatures in VMS deposits. Mineralized areas contain phengitic white micas with 2,200-nm 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 ...
WebMar 1, 2024 · Alteration indexes, such as the Ishikawa alteration index (AI) and the chlorite-carbonate-pyrite index (CCPI), have been developed to measure the intensity of sericite, chlorite, carbonate, and ... 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 ...
WebAug 1, 2001 · Zonal alteration is a common feature in volcanic rocks surrounding sea-floor massive sulfide deposits. Alteration indexes, such as the Ishikawa alteration index (AI) …
WebFeb 2, 2024 · The alteration box plot, combining the Ishikawa alteration index (AI) and the chlorite–carbonate–pyrite index (CCPI), is a powerful means of understanding the relationship between mineralogy, petrogeochemistry, and intensity … taxi oxford stationWebThis contribution presents a 3D assessment of metamorphosed and deformed, hydrothermally altered volcanic rocks, hosting the massive sulphide deposits of the Kristineberg area in the 1.9 Ga Skellefte mining district in northern Sweden, using six calculated alteration parameters: the Ishikawa alteration index, the … the cincy holiday expo 2022WebFeb 17, 2016 · The relationship between Na 2 O and K 2 O with the Ishikawa alteration index (Ishikawa AI = [100(K 2 O + MgO)/(K 2 O + MgO + CaO + Na 2 O)]) of Ishikawa et al. for the altered rocks shows that the data are plotted close to calcite/albite for zone 1, chlorite/sericite as well as dolomite/ankerite for zone 2, and chlorite/sericite for zone 3 ... taxi oxford parkwayWebApr 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 ... the cinderella effect refers to the fact thatWebAlteration Index and Depth Ratios at the Northwest Zone of the Lemarchant ... Ishikawa alteration index (AI), Ba/Sr, and low Na 2O values and elevated SiO 2 and K 2O, Fe 2O 3, … taxi oxford to londonWebAug 1, 2001 · Zonal alteration is a common feature in volcanic rocks surrounding sea-floor massive sulfide deposits. Alteration indexes, such as the Ishikawa alteration index (AI) … taxip3WebApr 1, 2004 · Using five petrologic rules, the NORMAT calculations first compute normative alteration (paragonite, sericite, chlorite, pyrophyllite) and precursor minerals (albite, … taxi owners insurance oakleigh south