The Lewisian chronology of the southern region of the Scottish mainland
作者： S. Moorbath , R. G. Park
DOI: 10.1144/SJG08010051
关键词: Metamorphism 、 Paleontology 、 Basement (geology) 、 Chronology 、 Bay 、 Cataclastic rock 、 Gneiss 、 Geochemistry 、 Lewisian complex 、 Geology 、 Parent rock
摘要: Synopsis K-Ar measurements on gneisses and basic intrusive bodies from the Torridon, Gairloch Gruinard Bay areas demonstrate (i) existence of a few relict Badcallian (≡ Early Scourian Sutton Watson 1969) dates c. 2600 m.y. in area, (ii) emplacement Scourie dykes at as well Aundrary basite sheet near Gairloch, least 2200 ago, case probably during waning stages Inverian metamorphism, (iii) occurrence first Laxfordian metamorphism 1700 second 1500 third (retrogressive) area 1400 (iv) post-Laxfordian cataclasis reheating Torridon 1150 ago. The significance these results is discussed detail compared contrasted with published age data. A statistical re-examination lead isotope Moorbath et al. (1969), covered this paper only, confirms that parent rocks typical basement were already 2900 ago subjected to their highest-grade time.
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