Contributions to the Mineralogy of the Newark Group in Pennsylvania
Contributions to the Mineralogy of the Newark Group in Pennsylvania
Edgar Theodore Wherry
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Van Hise. 15 The evidence favoring the former consists in (1) The fact that considerable water does accompany every eruption, and is given off as the magma solidifies. (2) The fact that fluorine and boron are frequently present in the minerals in question, these elements being usually of magmatic origin. (Emerson. ) (3) The fact that the waters effecting the decomposition of the original rock and the development of the new minerals must have been free from oxy- gen, in that ferrous iron was not... changed in the process. (Hawes. ) (4) The fact that the minerals first deposited are usually anhydrous, and the degree of hydration increases in the successive layers. In opposition to these views it may be objected : (1) That zeolites are not known to form in modern lavas at the time of their extrusion, even though abundant water is present. (Dana. ) (2) That the fluorine and boron might be derived by the decomposition of primary minerals containing them, such as tourmaline or danburite. (Fischer.
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