The structure, fabrics and AMS of the Slieve Gullion ring-complex, Northern Ireland: testing the ring-dyke emplacement model

Carl T. E. Stevenson; Brian O'Driscoll; Eoghan P. Holohan; Rebecca Couchman; R. John Reavy; Graham D. M. Andrews

doi:10.1144/sp302.12

The structure, fabrics and AMS of the Slieve Gullion ring-complex, Northern Ireland: testing the ring-dyke emplacement model

Geological Society London Special Publications ◽

10.1144/sp302.12 ◽

2008 ◽

Vol 302 (1) ◽

pp. 159-184 ◽

Cited By ~ 8

Author(s):

Carl T. E. Stevenson ◽

Brian O'Driscoll ◽

Eoghan P. Holohan ◽

Rebecca Couchman ◽

R. John Reavy ◽

...

Keyword(s):

Northern Ireland ◽

Ring Complex ◽

Ring Dyke

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Structure and petrogenesis of a mixed-magma ring dyke in the Peruvian Coastal Batholith: eruptions from a zoned magma chamber

Earth and Environmental Science Transactions of the Royal Society of Edinburgh ◽

10.1017/s0263593300014140 ◽

1988 ◽

Vol 79 (2-3) ◽

pp. 87-104 ◽

Cited By ~ 6

Author(s):

M. Andrew Bussell

Keyword(s):

Magma Chamber ◽

Present Level ◽

Ring Fault ◽

Brittle Ductile Transition ◽

Erosion Level ◽

Ring Complex ◽

Ring Structures ◽

Transient Events ◽

Flat Roofs ◽

Ring Dyke

ABSTRACTRing complex granites of the Peruvian Batholith are tabular bodies with flat roofs emplaced by cauldron subsidence. Marginal precursory ring dykes extend upwards above roof level and a typical intrusion is “H”-shaped in cross-section. Advance of magma by repeated subsidence would give a ladder-shaped profile for such intrusions above the brittle-ductile transition. Close relationships exist between intrusion geometry, emplacement process and petrogenetic evolution. Initially a granodioritic magma chamber lay beneath the present erosion level, trapping a rising mass of dioritic magma. Expansion of granodioritic liquid resulted in the injection of microgranite and tuffisite cone sheets accompanied by roof uplift within a ring fault. Next, during subsidence within the ring fault, liquids from deeper levels in the underlying chamber rose by stoping along the outer margin of the fault to form a ring dyke. Prior to intrusion, this liquid was vertically zoned from rhyodacite downwards to diorite and these liquids became partially mixed during emplacement. Finally, granodioritic magma rose to the present level by subsidence of a roof slab bounded by the ring fault. The precursory ring structures preserve evidence of significant but transient events in the underlying chamber. Liquid differentiation may be significant in the evolution of many large plutons.

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The Structure of the Marumbe Ring-Complex, Nuanetsi Igneous Province, Southern Rhodesia

Geological Magazine ◽

10.1017/s0016756800049505 ◽

1964 ◽

Vol 101 (3) ◽

pp. 274-281 ◽

Cited By ~ 1

Author(s):

R. L. Johnson

Keyword(s):

Hanging Wall ◽

Small Ring ◽

Igneous Province ◽

Ring Complex ◽

Southern Rhodesia ◽

Ring Dyke

AbstractThe Marumbe complex is a small ring-intrusion consisting essentially of a plug of nordmarkite separated from the basalt country rocks by a later ring-dyke and roof-sheet of granite. The lower and upper surfaces of a screen of basalt, which lies between the top of the nordmarkite body and the base of the granite roof-sheet, correspond to successive horizontal fractures which permitted blocks limited by ring-fractures to subside as the nordmarkite and granite magmas were intruded. A series of sheets of granite are developed locally in the hanging-wall of the above-mentioned ring-dyke, and further granite ring-dykes cut the nordmarkite and the country rocks.

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