By Priv.-Doz. Dr. Bernd Lehmann (auth.)
Metallogeny of Tin makes an attempt to increase a basic metallogenic version for tin in settling on the fundamental or suitable methods in tin ore formation. The methodological precept is predicated on an interaction among a history of easy petrogenetic techniques and a couple of particular neighborhood and neighborhood facts on tin deposits and tin provinces. the writer condenses the numerous it appears particular complexities encountered in person ore deposits to some significant approaches of normal importance.
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Extra info for Metallogeny of Tin
The erosion level in the western Erzgebirge is relatively 51 deep with an exposure of granitic rocks at a plutonic level, whereas the eastern Erzgebirge granites are exposed in most apical portions and at a subvolcanic level (Fig. 19). The eastern Erzgebirge granites and cataclasitesubvolcanic complexes are characterized by multiple episodes of large-scale fluid-explosive brecciation and concomitant greisenization in a caldera setting (Seltmann et al. 1990). Geological and thermobarometric data suggest for the Altenberg tin deposit a depth of formation of 1000-1500 m below the paleosurface, whereas the corresponding figures for the Ehrenfriedersdorf deposit are 2000 m, and for the Eibenstock deposit in the western Erzgebirge 4000 m (Thomas 1982).
B K-feldspar megablasts with haloes of Li-bearing mica (dark) in greisenized YG 2 granite. Further blastesis of K-feldspar and quartz leads in apical contact zones to the formation of pegmatitic "stockscheider" zones. Length of photograph is about 1 m (Ehrenfriedersdorf Mine, Sauberg section). C Stockwork/sheeted-vein mineralization in greisenized YG 2 microgranite ("Schnittmuster-Greisen"). Veinlets consist predominantly of Li-mica. 5 m (Altenberg Mine). " . ° , + 500 m Fig. 18. The zonal arrangement of major morphologic-mineralogical types of tin mineralization in the Erzgebirge (Baumann and Tischendorf 1976:301).
The empirical application of this concept is given in Fig. 10 in which Fe203/FeO ratios of granitic host rocks from three major ore environments (copper porphyries, molybdenum porphyries, tin porphyries/granites) are compared. SiO 2 is used as the most simple expression for the general degree of magmatic differentiation. The limit between magnetite- and ilmenite series granites is empirically derived (Ishihara et al. 1979). 5 for the equilibrium magnetite/ilmenite (assuming no other Fe-bearing phases present).
Metallogeny of Tin by Priv.-Doz. Dr. Bernd Lehmann (auth.)