The Elements of economic geology

Bibliographic data

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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vi THE ELEMENTS OF ECONOMIC GEOLOGY Deposits (1913); for the bearing of physical chemistry on the formation of mineral deposits to Dr. R. H. Rastall’s recent Physico-Chemical Geology, and for the processes of rock formation to The Principles of Petro- logy, by Dr. G. W. Tyrrell, a colleague to whom I am indebted for much help in the preparation of this work. Theories of ore formation still show great but not un- natural differences of opinion ; the conclusions stated in this book differ from those of some standard works by regarding more ores as due to the deposition, solution, and redeposition of sedimentary metallic grains, and by accepting fewer ores as due to direct igneous processes ; and also by regarding the source of most metals as an ore-zone beneath the ordinary igneous rocks of the crust and not the igneous rocks themselves. Twenty years ago I put forward explanations of some fields on those lines, which were opposed by most of the authorities ; but opinion has since changed, and the extension of these conclusions may be expected to some other fields. Some of the authorities whose opinions are not adopted may feel that their conclusions have been dismissed too briefly ; but the need for brevity has prevented the full statement of the case for either side. The apparent discourtesy of the dismissal of eminent opinion without due notice is the discomfortable fate of those who write brief text- books on wide subjects. “A tale has seven variations, and all cannot be told if time is short,” was the tactful remark with which my East African headman once explained away a misunderstanding ; and the infinite variety of subjects with which Economic Geology deals, and the ambiguity of much of its evidence, give equal variability to the solution of its problems. If the book had been twice as long some views would not have been rejected with the apparent dogmatism rendered necessary by the limitations of space. J W. G. GLASGOW November, 1027

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