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By Ahmad M.S. Al-Shanti (Auth.)

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1913. Ore deposits of Butte, Montana. Am. Inst. Min. Eng. Trans. 64, 1-109. S I B S O N , R. , M O O R E , J. , and R A N K I N , A. H. Seismic pumping—a hydrothermal fluid mechanism, /. geol. Soc. Lond. 131, 653-659. 1975. transport QUESTIONS, ANSWERS AND COMMENTS DR. RAMSAY: We have heard from Dr. Brown of plutons in Najd faults, and a "Najd Orogeny" is AL-SHANTI sometimes mentioned. On the other hand, you have mentioned and described brittle structures. In places such as the Juqjuq quadrangle it is important, from a stratigraphie point of view, to know how much shearing, recrystallization and/or metamorphism was associated with the Najd structures.

The later red syenogranites and alkalic granites form circular or ovoid plutons (Fig. 3) and were diapirically emplaced into brittle crust at shallow depth. Some bodies are ring structured and are presumably the roots of volcanic calderas (that is, three plutons shown with internal trend lines in the north-western part of Fig. 3). The progressive change of shape and character of the granite plutons from moderately deep to shallow emplacement indicates rapid erosion during the interval of granite emplacement.

Pyroxenite and/or peridotite in the southern part of the AlAmar-Idsas region may be enclosed within either the Abt schist or the Halaban volcanics. AL-AMAR-IDSAS ROCK UNITS The Al-Amar-Idsas fault is bordered to the east by rocks of the Halaban volcanic Group and to the west by a metasedimentary unit, the Abt Formation. Gabbros and diorites, distributed along north-south trends, are restricted to rocks east of the fault whereas granodiorites occur both east and west of the fault. Gneissic granodiorite forms the basement to the Halaban Group east of the fault.

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