United States Congressional Serial Set
United States Congressional Serial Set
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9.— Ideal cross section through Iron Mountain laccolith, showing structural relations of ores.
ORE DEPOSITS IN BRECCIAS.
The ore constitutes cements or minute veins in fault breccias formed by the Homestake limestone, Pinto quartzite, or andesite at several localities, as follows: Limestone and quartzite at the Milner mine, Dear, Excelsior, Duluth No. 2, Desert Mound; andesite ^1 Wve 70 IRON ORES OF IRON SPRINGS DISTRICT, UTAH.
Marshall, Blowout, Dexter, and Pot Metal claims. At the Desert Moun...d a fault breccia crosses andesite, ore, and limestone, and mag- netite constitutes breccia fragments.
The iron ores lack the associated '^iron formation'* of ferruginous chert or jasper so characteristic of the Lake Superior iron ranges.
The nearest approach to jasper is in ores banded parallel to the walls in the fissure veins in the andesite, and in contact ores with a banding representing original limestone bedding.
The ore deposits nowhere come in contact with the later eflFusives.
However, it is a significant fact, to which attention will be directed in discussion of origin of the ores, that the principal ore deposits are approximately on the level of the general surface upon which the lavas rest, sometimes above it but never below, and that the effusive rocks before erosion must have rested upon the present deposits.
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To quickly assess the difficulty of the text, read a short excerpt:
9.— Ideal cross section through Iron Mountain laccolith, showing structural relations of ores.
ORE DEPOSITS IN BRECCIAS.
The ore constitutes cements or minute veins in fault breccias formed by the Homestake limestone, Pinto quartzite, or andesite at several localities, as follows: Limestone and quartzite at the Milner mine, Dear, Excelsior, Duluth No. 2, Desert Mound; andesite ^1 Wve 70 IRON ORES OF IRON SPRINGS DISTRICT, UTAH.
Marshall, Blowout, Dexter, and Pot Metal claims. At the Desert Moun...d a fault breccia crosses andesite, ore, and limestone, and mag- netite constitutes breccia fragments.
The iron ores lack the associated '^iron formation'* of ferruginous chert or jasper so characteristic of the Lake Superior iron ranges.
The nearest approach to jasper is in ores banded parallel to the walls in the fissure veins in the andesite, and in contact ores with a banding representing original limestone bedding.
The ore deposits nowhere come in contact with the later eflFusives.
However, it is a significant fact, to which attention will be directed in discussion of origin of the ores, that the principal ore deposits are approximately on the level of the general surface upon which the lavas rest, sometimes above it but never below, and that the effusive rocks before erosion must have rested upon the present deposits.
What to read after United States Congressional Serial Set?
You can find similar books in the "Read Also" column, or choose other free books by United States. Government Printing Office to read onlineMoreLess
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