The Elements of economic geology

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Monograph

Identifikator:: 1773832379

URN:: urn:nbn:de:zbw-retromon-172798

Document type:: Monograph

Author:: Gregory, John W. http://d-nb.info/gnd/11683014X

Title:: The Elements of economic geology

Place of publication:: London

Publisher:: Methuen

Year of publication:: 1928

Scope:: XIV, 312 S.; graph. Darst.

Digitisation:: 2021

Collection:: Economics Books

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Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: Part II. Ore deposits

Collection:: Economics Books

ORES OF FIVE MINOR METALS 123 Lower Trias has been thrust-faulted over the Palzozoic, under which lies a dolomite breccia belonging to the Middle Trias. The ores are chiefly in the Wengen beds (Upper Trias). Fig. 38 shows that Lipold’s interpretation, estab- lished by 1874, has been confirmed ; the Carboniferous beds have been thrust from the N. over the Trias by the Alpine movements. CALIFORNIA AND CHiNa—The mercury fields of California (cf. Becker, U.S.G.S., Mon. No. 13, 1888) and of S.W. China (F. R. Tegengren, G.S. China, Bull. ii, 1920, pp. 1-36) occur in beds shattered and overthrust by the Middle 18 1g Fo Sais Fig, 38.—SECTION ACROSS THE IDRIA FIELD. Section across the Idria Field showing the thrust plane (after Bloudek). T.S., Theresia Shaft; I.S., Insaghi Shaft; J.S., Josefi Shaft; 5, St, Cassian Beds ;. Upper Part of Upper Trias. 4, Wengen Beds; Lower Part of Upper Trias. Main Ore Bodies, {11}; ... Middle Trias, Limestone and Dolomite. 2-2, Lower Trias-Werfen Beds. 1-1, Carboniferous-Gailthal Beds (with Land plants); FFF, Faults. T.P., Thrust Plane. According to one interpretation the rock at the base of the Theresia Shaft is a Cretaceous Limestone and the ore-body and adjacent beds have been overthrust on to the limestone. Kainozoic mountain-forming movements. Minor deposits of Mercury are known in many parts of the world, especially along the Alpine-Himalayan mountain system and on the western mountains of North and South America. The de- Posits are sometimes of very recent date; thus the Pleisto- cene lake deposits at Ohzawai in the Bay of Islands, New Zealand, contain veinlets of cinnabar with marcasite and traces of gold, silver, and antimony, which are being deposited by hot water in fissures (A. P. Griffiths, Tr. N.Z IM.E., ii, 1898, p. 52). ASSOCIATION oF Ores with Kawozorc Mountain Move- MENTS—The mercury ores are therefore geologically young and

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