Dbk at 12:51, 25 September 2017

2017-09-25T12:51:20Z

← Older revision		Revision as of 13:51, 25 September 2017
Line 28:		Line 28:
	<references/>		<references/>

	[[Category:Northern Ireland]]		[[Category:The geology of Northern Ireland]]

Dbk: 1 revision imported

2017-09-25T10:49:15Z

1 revision imported

← Older revision	Revision as of 11:49, 25 September 2017
(No difference)

Dbk at 08:56, 20 September 2017

2017-09-20T08:56:20Z

New page

{{nibrg}}
M R Cooper and T P Johnston

== Introduction ==
[[File:P947865.jpg|thumbnail|Distribution of Palaeogene intrusive centres in the north of Ireland (P947865)]]

[[File:P948030.jpg|thumbnail|Landsat TM5 winter scene of the southeastern part of Northern Ireland showing the three principal Palaeogene intrusive igneous centres of Carlingford, Slieve Gullion and the ring dyke and the Mourne Mountains. (P948030)]]

The focus of intrusive Palaeogene igneous activity was located in Counties Down and Armagh in Northern Ireland and in Co. Louth in the Republic of Ireland [[Media:P947865.jpg| (P947865)]]. Three central complexes, the Mourne Mountains, Slieve Gullion and Carlingford intrude the deformed Silurian turbidite succession of the Southern Uplands-Down-Longford Terrane. [[Media:P948030.jpg| (P948030)]] The rocks formed at this time were predominantly silicic in composition and included large volumes of granite, felsite and granophyre. However, significant bodies of basalt, dolerite and gabbro also formed at this time in the Slieve Gullion and Carlingford complexes. The regional gravity map of Northern Ireland shows a large positive Bouguer anomaly slightly offset to the north of Slieve Gullion and the Mourne Mountains which may represent a concealed, high density, basic or ultrabasic body <ref>Carruthers, R M, Cornwell, J D, Turnbull, G, Walker, A S D, and Bennett, J R P. 1987. Interpretation of the Bouguer gravity anomaly data for Northern Ireland. ''Regional Geophysics Research Group, British Geological Survey'' No. RG 87/5.</ref>.

'''Intrusive centres'''
:Intrusive centres

::[[Carlingford Complex, Palaeogene intrusive centre, Northern Ireland|Carlingford Complex]]

::[[Mourne Mountains Complex, Palaeogene intrusive centre, Northern Ireland|Mourne Mountains Complex]]

::[[Slieve Gullion Complex, Palaeogene intrusive centre, Northern Ireland|Slieve Gullion Complex]]

:Minor igneous intrusions

::[[Dykes, minor igneous intrusions, Palaeogene, Northern Ireland|Dykes]]

::[[Plugs, minor igneous intrusions, Palaeogene, Northern Ireland|Plugs]]

::[[Sills, minor igneous intrusions, Palaeogene, Northern Ireland|Sills]]
==References==
<references/>

[[Category:Northern Ireland]]

Palaeogene intrusive igneous rocks, Northern Ireland - Revision history

Dbk at 12:51, 25 September 2017

Dbk: 1 revision imported

Dbk at 08:56, 20 September 2017