The BGS Lexicon of Named Rock Units — Result Details

Norwick Hornblendic Schist Type 3

Computer Code: NORH3 Preferred Map Code: notEntered
Status Code: Full
Age range: Cambrian Period (E) — Cambrian Period (E)
Lithological Description: Clinopyroxene, garnet, brown hornblende schist forming basic intrusive lenses and sheets.
Definition of Lower Boundary: Not applicable, -chilled margins.
Definition of Upper Boundary: Not applicable, -chilled margins.
Thickness: Up to several metres thick.
Geographical Limits: Occurs locally in small outcrops on Fetlar. Outcrops are typically lenses or small sheets. The main locations are opposite 'The Clett', at Dempster's Geo, southwest of the Virva section and at Honga Ness.
Parent Unit: Shetland Ophiolite Complex (SHOP)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  At the foot of the sea cliff opposite 'The Clett', on Fetlar. Flinn, 1993. 
Reference(s):
Flinn D. New evidence that the high temperature hornblende-schists below the Shetland ophiolite include basic igneous rocks intruded during obduction of the 'cold' ophiolite. 1993. Scottish Journal of Geology, 29 [2], 159-65. 
Read H H. 1934. The metamorphic history of the Unst in the Shetland Islands Quarterly Journal of the Geological Society of London, 90, 637-88. 
Flinn, D, Miller, J A and Roddom, D. 1991. The age of the Norwick hornblendic schists of Unst and Fetlar and the obduction of the Shetland ophiolite. Scottish Journal of Geology, 27 (1), 1-80. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S131