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Zusammenfassung Erzpetrographische Untersuchungen von Ni-reichen Erzproben der Ni–Co–Bi–(Ag)-Lagerstätte Zinkwand (Schladminger Tauern, Steiermark) führten zum Nachweis einer Paragenese von Gersdorffit, Nickelin, Pararammelsbergit, ged. Wismut, Wismutglanz und Parkerit. Gersdorffit tritt in zwei deutlich voneinander verschiedenen (Reflexionsvermögen, Mikrohärte) Komponenten M und I auf. Mikrosondenanalysen zeigen einheitlichen Chemismus der Komponente M, hingegen unterschiedlichen der Komponente I, hervorgerufen durch starken Zonarbau. Gersdorffit I repräsentiert vermutlich Gersdorffit mit ungeordneter Struktur und RaumgruppePa3, Gersdorffit M hingegen vertritt Gersdorffit mit RaumgruppeP213. Gersdorffit, Nickelin und Parkerit weisen Gehalte von±2Gew.% Sb auf. Antimon-hältiger Parkerit ist von den bis heute nachgewiesenen vier Fundpunkten des Minerals nicht bekannt. Vorsichtige Abschätzung der Bildungstemperatur ergibt für die Gersdorffit-Nickelin-Pararammelsbergit-Assoziation sicher <450°C, für jene von Parkerit-ged. Wismut-Wismutglanz<273°C.
Mit 3 Abbildungen
Herrn Univ. Prof. Dr.H. Meixner zum 70. Geburtstag gewidmet. 相似文献
Gersdorffite (in two structure varieties) and antimonian-parkerite, Ni3 (Bi, Sb)2S2 of the Zinkwand, Cchladminger Tauern, Austria
Summary Ore petrologic investigations of a Ni-rich assemblage from the Ni–Co–Bi–(Ag)-deposit Zinkwand (Schladminger Tauern, Styria, Austria) resulted in the identification of gersdorffite, nickeline, pararammelsbergite, native bismuth, bismuthinite and the rate ore mineral parkerite, so far not recorded from that locality. Gersdorffite occurs as two distinctly different varieties M and I (reflectance, microhardness). Microprobe analyses show uniform composition of phase M, but compositional variations of phase I caused by strong zonal texture. Gersdorffite I probably represents gersdorffite with disordered structure with space groupPa3; gersdorffite M corresponds to the gersdorffite with space groupP213. Gersdorffite, nickeline and parkerite contain about 2 wt.% Sb. Sb-containing parkerite has not been reported from the four known occurrences of that mineral. Temperature of formation for the Ni-minerals has been estimated to be (considerably?) below 450°C, for the Bi-bearing minerals below 273°C.
Mit 3 Abbildungen
Herrn Univ. Prof. Dr.H. Meixner zum 70. Geburtstag gewidmet. 相似文献
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Baisakhi Das Rima Chatterjee Dip Kumar Singha Rajan Kumar 《Journal of the Geological Society of India》2017,90(1):32-40
Seismic attributes such as: amplitude envelope, instantaneous phase and cosine of instantaneous phase of 2D post-stack seismic data facilitates structural and stratigraphic interpretation of shallow marine offshore, Krishna-Godavari basin. Two seismic sections namely, X and Y oriented N-S passing through wells W-1 andW-2 respectively are considered for seismic attribute analysis and porosity prediction. The gamma ray log trend indicates deposition of cleaning upward sediment. Coarsening upward, clayey-silty-sandy bodies, making a series of about 50-60 m thickness, have been evidenced from the gamma ray log. An extensional structural style comprising growth faults is associated with the progradational style of deposition. Four seismic zones have been distinguished. These zones differ in amplitude, frequency and continuity of the reflectors. Channel sands of Cretaceous age of Raghavapuram shale are identified in well log, seismic section and its acoustic impedance section. Major stratigraphic horizons along with faults extending to basement are marked with the help of attribute analysis. Porosity is mapped from transformation of acoustic impedance. The shales/unconsolidated sediments measure a high porosity with low impedance and the more porous sands are in an intermediate range. The predicted impedance and porosity values may be erroneous beyond the drilled depth because of non availability of well log data for calibration. 相似文献
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