Results 131 to 140 of about 253 (188)
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Age of the Khangai batholith and challenge of polychronic batholith formation in Central Asia
Doklady Earth Sciences, 2013The Central Asian fold belt (CAFB) exhibits many manifestations of granitoid magmatism. The granite formation is largely determined by the convergence of the Siberian continent with structures of the Paleo Asian ocean, which was practically continuous from the Late Riphean until the Early Mesozoic.
V. V. Yarmolyuk +6 more
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The Problem of Batholithic Intrusion
Geological Magazine, 1923Speculation as to the causes of the great intrusions known as batholiths is coeval with petrology as a science. Daly says that batholiths are “the least understood of all the intrusive bodies. If they were truly understood there would be no ‘problem’ of the igneous rocks”.1 This, no doubt, puts the matter too strongly, but there is nevertheless much ...
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2021
Wie verschaffen sich Magmen beim Aufstieg den notigen Raum? Die mechanisch einfachste Losung scheint die Aufwolbung der uberlagernden Gesteine zu sein. Am Sandfell in Island ist ein solches Verhalten anschaulich dokumentiert. Das Magma ist hier zwischen Lagen aus Basalt eingedrungen und hat das Dach erkennbar nach oben gewolbt.
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Wie verschaffen sich Magmen beim Aufstieg den notigen Raum? Die mechanisch einfachste Losung scheint die Aufwolbung der uberlagernden Gesteine zu sein. Am Sandfell in Island ist ein solches Verhalten anschaulich dokumentiert. Das Magma ist hier zwischen Lagen aus Basalt eingedrungen und hat das Dach erkennbar nach oben gewolbt.
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On the Antarctic Peninsula batholith
Geological Magazine, 1995AbstractThe plutonic rocks of the Antarctic Peninsula magmatic arc form one of the major batholiths of the circum-Pacific rim. The Antarctic Peninsula batholith is a 1350 km long by < 210 km wide structure which was emplaced over the period ˜240 to 10 Ma, with a Cretaceous peak of activity that started at 142 Ma and waned during the Late Cretaceous.
Leat, P. T. +2 more
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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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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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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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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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