Identifier: depositsofuseful02beysuoft (find matches)
Title: The deposits of the useful minerals & rocks; their origin, form, and content
Year: 1914 (1910s)
Authors: Beyschlag, Franz Heinrich August, 1856-1935 Krusch, Johann Paul, 1869-1939 Vogt, J. H. L. (Johan Herman Lie), 1858-1932
Subjects: Mines and mineral resources Ore deposits
Publisher: London Macmillan
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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particularly, many faultsalong which huge segments of the younger rocks have subsided, havebeen delineated. The combination of folding and faulting, as illustratedin Fig. 347, produces an extremely complicated tectonic figure. The ore-bearing horizon occurs in the Wetterstein limestone. It isa light-coloured dolomitic limestone within which, though seldom, darkerand presumably bituminous layers are intercalated. The proportion ofMgCOg varies between 0-1 and 40 per cent. According to the section givenin Fig. 347 the follomng beds in addition are represented in the Bleiberg ;the Cardita beds which are younger than the limestone ; the overlyingMain Dolomite ; and finally, in the foot-wall of the limestone, the Wetter-stein dolomite. The Dobratsch mountain on the opposite side of thevalley consists, in the vicinity of the break, of Wetterstein dolomite. The deposits at Bleiberg are chiefly irregular cavity-fillings andmetasomatic deposits, the distribution of these being closely connected
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THE METASOMATIC LEAD-SILVER-ZmC DEPOSITS 743 with the Bleiberg Break. They occur almost exclusively in the ore-bearinglimestone. Their form has been aptly described by Posepny as pipe-shaped.Keference to Fig. 58 shows the striking agreement which exists between thebodies of each individual district, in relation to the direction in which theylie ; the axes of these bodies, as already recognized by Mohs, coincide withthe Unes of intersection of two planes, namely, the bedding-plane of the Hme-stone and that of certain fissures. At Bleiberg itself these fissures areknown as lodes and the bedding-planes as planes, while at Kreuth they aretermed cross fissures and beds respectively. It is particularly noteworthythat these axes are not dependent upon certain limestone bands butupon certain bedding-planes separating the hmestone, such planes being &aM of QuiZit^ hi HD m ^, ^ wiT^^ir ^^iM. \VD WD = Wetterstein dolomite VMt Witterstcin times tone. C Cardita BedsHD ■ Main dolomite ll Dump

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