"The origin of the alteration and copper mineralization in the Keweenawan lavas of the Upper Peninsula of Michigan is one of the well known controversial topics in Economic Geology. The literature on this problem is most extensive and an attempt was made in this thesis to first review as many aspects of the discussion as appeared to be necessary. This portion is necessarily extensive, and it is hoped that some new light has been thrown here on some patterns of approach or thought which, today, can hardly be called scientific.
Next, the observations made in the field, on hand specimens and on thin sections are given in this sequence.
Then, the principal tool used for this study is developed and described. This is the congruency between geometric and compositional properties of the lavas. Many examples pre described and figures reproduced. The features of congruency are numerous and an adequate coverage of the major ones would require an even more extensive treatment than offered here.
Finally, the following conclusions are drawn on the genesis of the alteration and the mineralization: The small and large scale congruency between the mineral distributions and the following primary features exclude a later introduction of alteration and mineralization fluids, and supports a deuteric age and nature of both, the copper and the associated minerals, as well as that of many rock forming minerals; 1) different breccia fragments, 2) breccia fragments and matrix, 3) various interpenetrating generations of lava 4) flow features, 5) top-bottom features, 6) amygdales "steam-pipes", etc. "--Abstract, pages iv-v.
Amstutz, G. C. (Gerhardt Christian), 1922-
Brownlow, Arthur H.
Proctor, Paul Dean, 1918-1999
Legsdin, Adolph, 1899-1969
Geosciences and Geological and Petroleum Engineering
M.S. in Geology
Missouri School of Mines and Metallurgy
v, 241 pages
© 1961 Peethambaram Dorai Babu, All rights reserved.
Thesis - Open Access
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Babu, Peethambaram Dorai, "Certain features of alteration in the Michigan lavas and their genetic interpretation" (1961). Masters Theses. 2771.