Results 151 to 160 of about 262 (200)
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Geology, 1975
Rise of the Cordilleran infrastructure during the last half of Mesozoic time provided the gravity potential for lateral spreading and overthrust movements. Near the northeastern margin of the Idaho batholith a tectonic block, 100 by 75 km in size, became detached from the infrastructure in the later stages of its evolution and moved more than 25 km ...
Donald W. Hyndman +2 more
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Rise of the Cordilleran infrastructure during the last half of Mesozoic time provided the gravity potential for lateral spreading and overthrust movements. Near the northeastern margin of the Idaho batholith a tectonic block, 100 by 75 km in size, became detached from the infrastructure in the later stages of its evolution and moved more than 25 km ...
Donald W. Hyndman +2 more
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Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 1988
ABSTRACTThe Peninsular Ranges Batholith of southern and Baja California is the largest segment of a Cretaceous magmatic arc that was once continuous from northern California to southern Baja California. In this batholith, the emplacement of igneous rocks took place during a single sequence of magmatic activity, unlike many of the other components of ...
Silver, L. T., Chappell, B. W.
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ABSTRACTThe Peninsular Ranges Batholith of southern and Baja California is the largest segment of a Cretaceous magmatic arc that was once continuous from northern California to southern Baja California. In this batholith, the emplacement of igneous rocks took place during a single sequence of magmatic activity, unlike many of the other components of ...
Silver, L. T., Chappell, B. W.
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Batholiths of Southern Rhodesia
Geological Magazine, 1932THE problem of the formation of the larger masses of granite is receiving considerable attention by geologists at the present time, and it is hoped that the following observations and surmises regarding the granites of Southern Rhodesia may be of more than local interest. Southern Rhodesia forms part of a typical Pre-Cambrian shield and consists, apart
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Endomorphism of the Idaho batholith
Geological Society of America Bulletin, 1942Study of many parts of the Idaho batholith shows considerable endomorphism by post-consolidation solutions. The solutions, enriched particularly in silica but also in variable but generally appreciable quantities of potash and minor amounts of other elements, produced many changes in the solid rock.
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1984
The 1600 km long Coastal Batholith of Peru is emplaced, in the main, within an ‘ensialic’ marginal basin, of lower Cretaceous age, made up of volcaniclastics, pillow lavas, sills and gabbros. Major and trace element analysis indicate much of the variation, from quartz diorite to granite sensu stricto, is the result of fractionation in place, though ...
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The 1600 km long Coastal Batholith of Peru is emplaced, in the main, within an ‘ensialic’ marginal basin, of lower Cretaceous age, made up of volcaniclastics, pillow lavas, sills and gabbros. Major and trace element analysis indicate much of the variation, from quartz diorite to granite sensu stricto, is the result of fractionation in place, though ...
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The Vermilion Batholith of Minnesota
The Journal of Geology, 1925This paper is a summary of the petrography and petrology of the largest granite batholith in Minnesota. The granite is of Algomian age and reached its position partly by crowding out its walls and largely by stoping upward into mica schists. Its main phase is a fresh biotite granite of no great peculiarity. Its minor phases, modified by metamorphism or
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On the rate of emplacement of batholiths
Journal of the Geological Society, 1975Determination of the rate of emplacement of batholiths is complicated by the complexity of a process involving segregation, intrusion and congelation, and by a lack of knowledge of the nature of granite magma. Times of uprise and freezing of individual pulses are of the order of a million years, possibly much longer for segration; rates which are ...
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Batholith-associated mineralization
1983Batholiths are characteristic features of cordilleran volcano—plutonic arcs at destructive plate junctures or collision belts paralleling orogenic suture zones. Important mineralization is associated with the granitoid phases of the batholiths, which vary considerably in character and composition with tectonic setting.
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