The deposits of the useful minerals & rocks; their origin, form, and content . in addition it forms persistent bed-like or flat lenticular masseswhich are found both in the deepest horizons exposed around Freiberg, aswell as in the mica-schist formation, which is materially younger. It isregarded as a laccolith or bed-like intrusion of eruptive character. In the upper portions of the Erzgebirge gneiss formation numerousbed-like intercalations of such sediments as limestone, grauwacke, con-glomerate, quartzite, mica-schist, phyllite-like rock, and garnet-micarock, occur between the eruptive mem
The deposits of the useful minerals & rocks; their origin, form, and content . in addition it forms persistent bed-like or flat lenticular masseswhich are found both in the deepest horizons exposed around Freiberg, aswell as in the mica-schist formation, which is materially younger. It isregarded as a laccolith or bed-like intrusion of eruptive character. In the upper portions of the Erzgebirge gneiss formation numerousbed-like intercalations of such sediments as limestone, grauwacke, con-glomerate, quartzite, mica-schist, phyllite-like rock, and garnet-micarock, occur between the eruptive members. These intercalations are tobe regarded as detached patches of the slate formation which formerly,as indicated in Fig. 334, completely covered the gneiss. Against this dome of eruptive gneiss lie sedimentary rocks. Thesein the neighbourhood of the granite are highly altered to mica-schist andgarnet-mica rock, into which gneissic material, represented by gneiss and THE LEAD-SILVER-ZINC LODES 671 gneissic mica-schist, was injected. Such rocks constitute the inner contact. Fig. 332.—MajD of the Freiberg lode district, neighbourhood of Freiberg. zone. Resting on this inner zone comes the outer contact zone of quartz- 672 ORE-DEPOSITS and albite-phyllites, these towards the hanging-wall merging into micaceous
Size: 1361px × 1835px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
