HIGH-PRECISION U-PB MONAZITE GEOCHRONOLOGY OF THE C.806 MA GRAMPIAN SHEAR ZONE AND THE IMPLICATIONS FOR THE EVOLUTION OF THE CENTRAL HIGHLANDS OF SCOTLAND

Authors
NOBLE SR HYSLOP EK HIGHTON AJ
Citation
Sr. Noble et al., HIGH-PRECISION U-PB MONAZITE GEOCHRONOLOGY OF THE C.806 MA GRAMPIAN SHEAR ZONE AND THE IMPLICATIONS FOR THE EVOLUTION OF THE CENTRAL HIGHLANDS OF SCOTLAND, Journal of the Geological Society, 153, 1996, pp. 511-514
Citations number
31
Categorie Soggetti
Geosciences, Interdisciplinary
Journal title
Journal of the Geological Society → ACNP
ISSN journal
00167649
Volume
153
Year of publication
1996
Part
4
Pages
511 - 514
Database
ISI
SICI code
0016-7649(1996)153:<511:HUMGOT>2.0.ZU;2-Y
Abstract
Two pegmatites and mylonitic rocks from the Grampian Shear Zone yield U-Pb monazite ages of 806 +/- 3 Ma, 808(-9)(+11) Ma, and 804(-12)(+13) Ma, respectively. These confirm that shearing and pegmatite crystalli zation was essentially synchronous. Lower intercepts of c. 440 Ma indi cate disturbance during Ordovician reworking. These new data question the concept of a single latest Proterozoic-early Palaeozoic orogeny in the Grampian terrane and the significance of the Great Glen Fault.