Basic Magma Chilled Against Acid Magma

Wager, L. R.; Bailey, E. B.

doi:10.1038/172068a0

Cited by 69 publications

(33 citation statements)

References 2 publications

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“…Indeed, acid magma may actually have been forming whilst the gabbro solidified" (1937, p. 260). We M e r from Reynolds only in applying these prinaples everywhere that we find dolerite becoming progressiveb finer in texture towards adjacent granophyre (Wager and Bailey 1953). We have seen hundreds of such contacts on Slieve Gullion (F'l.…”

Section: Intrusionsmentioning

confidence: 91%

Composite minor intrusions, and the slieve gullion complex, ireland

Bailey¹,

McCallien²

1957

Geological Journal

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The paper consists of two parts, both furnishing evidence that partially consolidated basalt can chill against penetrating acid veins. This recalls work by R. E. Wilcox on a mixed lava at Gardiner River, 1944. Part I is mainly concerned with certain composite intrusions where basic margins carry quartz xenocrysts and acid interiors carry quartz phenocrysts. It is argued that basalt magma rose from a deep source through quartz‐porphyry rock, melting and incorporating contacts. Presently the quartz‐porphyry melted bodily, and, no longer penetrable, followed its basaltic forerunner into the upper world. Being cooler than the basalt, it often appreciably chilled what it did not drive forward. Part II introduces some new features into the structural interpretation of the North‐West Belt of intrusions at Slieve Gullion, and claims that these intrusions and also the ring‐dyke of earlier date have been accompanied by marked distortion of country‐rock. The granophyre of the North‐West Belt seems to be essentially earlier than the associated dolerites. These latter melt the granophyre at contact and chill against rheomorphic veins. Much of D. L. Reynolds' work from 1937 onwards is accepted, including extensive remaking of Newry Devonian granodiorite under Tertiary conditions; but certain hypotheses of surface volcanitity and deep‐seated metamorphism are criticised.

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Section: Intrusionsmentioning

confidence: 91%

Composite minor intrusions, and the slieve gullion complex, ireland

Bailey¹,

McCallien²

1957

Geological Journal

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“…However, around the 1950s the magma mixing concept resuscitated energetically as the result of the indisputable evidence documented in the rocks (e.g. McCallien, 1956, Wager andBailey, 1953). After an infancy of about 20-25 years, in which a number of observations have been recorded (e.g.…”

Section: Introductionmentioning

confidence: 97%

The mixing of magmas in plutonic and volcanic environments: Analogies and differences

Perugini

Poli

2012

Lithos

145

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“…They form an important part of the British Tertiary Volcanic Province, having been recorded from Slieve Gullion (Reynolds, 1951), St. Kilda (Wager and Bailey, 1953), Bute (Buist, 1952) and Ardnamurchan (Richey and Thomas, 1930;Wells, 1954;Skelhorn and Elwell, in press). In Maine, U.S.A., they occur in an igneous complex of Devonian age (Chapman, 1962).…”

Section: Introductionmentioning

confidence: 97%

The Role of Cooling Cracks Formed at High Temperatures and of Released Gas in the Formation of Chilled Basic Margins in Net-veined Intrusions

Windley

1965

Geol. Mag.

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Cooling cracks form at high temperatures when a basic magma is either viscous or crystalline and hot. It is postulated that fine-grained margins form along the fractures by release of gas through the fracture network. This takes place (a) by raising the liquidus-solidus boundary due to release of volatiles, (b) by expansion of the released gas with consequent cooling. Granitic material introduced along the fractures post-dates and may recrystallize the " chilled " margins.

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Basic Magma Chilled Against Acid Magma

Cited by 69 publications

References 2 publications

Composite minor intrusions, and the slieve gullion complex, ireland

Composite minor intrusions, and the slieve gullion complex, ireland

The mixing of magmas in plutonic and volcanic environments: Analogies and differences

The Role of Cooling Cracks Formed at High Temperatures and of Released Gas in the Formation of Chilled Basic Margins in Net-veined Intrusions

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