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A tale of two Tweefonteins: What physical correlation, geochronology, magnetic polarity stratigraphy, and palynology reveal about the end-Permian terrestrial extinction paradigm in South Africa
High-precision U–Pb CA–ID–TIMS dating and chronostratigraphy of the dinosaur-rich Horseshoe Canyon Formation (Upper Cretaceous, Campanian–Maastrichtian), Red Deer River valley, Alberta, Canada
First high-precision U–Pb CA–ID–TIMS age for the Battle Formation (Upper Cretaceous), Red Deer River valley, Alberta, Canada: implications for ages, correlations, and dinosaur biostratigraphy of the Scollard, Frenchman, and Hell Creek formations
Lithostratigraphy of the upper Turinian – lower Chatfieldian (Upper Ordovician) foreland succession, and a U–Pb ID–TIMS date for the Millbrig volcanic ash bed in the Ottawa Embayment
A lithostratigraphic and magnetostratigraphic framework in a geochronologic context for a purported Permian–Triassic boundary section at Old (West) Lootsberg Pass, Karoo Basin, South Africa
PALEONTOLOGY OF THE BLAAUWATER 67 AND 65 FARMS, SOUTH AFRICA: TESTING THE DAPTOCEPHALUS/LYSTROSAURUS BIOZONE BOUNDARY IN A STRATIGRAPHIC FRAMEWORK
Is the vertebrate-defined Permian-Triassic boundary in the Karoo Basin, South Africa, the terrestrial expression of the end-Permian marine event?
The Salinic Orogeny in northern New Brunswick: geochronological constraints and implications for Silurian stratigraphic nomenclature 1 This article is one of a series of papers published in this CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology.
High-precision U–Pb age and geochemistry of the mineralized (Ni–Cu–Co) Suwar intrusion, Yemen This article is one of a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh.
Evidence for post-1200 Ma — pre-Grenvillian supracrustal rocks in the Pinware terrane, eastern Grenville Province at Battle Harbour, Labrador This article is one of a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh.
U–Pb zircon geochronology of eclogites from the Scandian Orogen, northern Western Gneiss Region, Norway: 14–20 million years between eclogite crystallization and return to amphibolite-facies conditions This article is one of a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh.
The Krogh revolution: advances in the measurement of time This article is the Introduction to a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh.
Geochronology and geochemistry of Precambrian gneisses, metabasites, and pegmatite from the Tobacco Root Mountains, northwestern Wyoming craton, Montana This article is one of a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh. T.E. Krogh deceased April 2008.
High-precision U–Pb zircon ID–TIMS dating of two regionally extensive bentonites: Cenomanian Stage, Western Canada Foreland Basin This article is one of a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh.
Magmatic and tectonic emplacement of the Pukaskwa batholith, Superior Province, Ontario, Canada This article is one of a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh.
GRENVILLE SKARN TITANITE: POTENTIAL REFERENCE MATERIAL FOR SIMS U–Th–Pb ANALYSIS
The German Bank pluton, offshore SW Nova Scotia: Age, petrology, and regional significance for Alleghanian plutonism
Evolution of early crust in chondritic or non-chondritic Earth inferred from U–Pb and Lu–Hf data for chemically abraded zircon from the Itsaq Gneiss Complex, West Greenland This article is one of a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh.
Deciphering igneous and metamorphic events in high-grade rocks of the Wilmington Complex, Delaware: Morphology, cathodoluminescence and backscattered electron zoning, and SHRIMP U-Pb geochronology of zircon and monazite
Geochronological investigations of early Archean gneiss complexes by U-Pb dating methods are complicated by the presence of zircon populations that contain multiple ages of magmatic and metamorphic growth, and inherited components from premagmatic crust formation processes. In an early ion-microprobe study in the Saglek block, Nain Province, northern Labrador, identical ages for magmatism of 3.73 Ga were reported for both amphibolite- and granulite-grade orthogneisses, based on the oldest 207 Pb/ 206 Pb ages in two and three grains, respectively ( Schiøtte et al., 1989 ). Here we present zircon ages for the same rock units as in the previous study of 3348 ± 7 Ma and 3634 ± 31 Ma, respectively, obtained by isotope-dilution thermal ionization mass spectrometry (ID-TIMS) methods, and based on the best quality grains from the dominant population of each rock. Zircon cores in the amphibolite-facies orthogneiss were separated from igneous overgrowths using a brief HF acid treatment and give ages ranging from 3700 to 3760 Ma, the age reported for magmatism in Schiøtte et al. (1989) . The time of major metamorphism in the amphibolite-facies orthogneiss is recorded by both Pb loss in the magmatic zircons and by new zircon growth within remnants of cross-cutting metadiabase at 2702 ± 2 Ma. The age for the early stage of granulite-facies metamorphism was reported by Schiøtte et al. (1989) as 2766 ± 17 Ma compared to the age reported here at 2740 ± 4 Ma. The results of this comparative study are instructive for the interpretation of sequential inherited, magmatic, and metamorphic zircon components in a complex population and for devising sampling strategies based on simple geological relations. Our new results demonstrate the way different ages can be obtained for the same rock unit due to contrasting approaches to dating geological events, and it is suggested that the earlier published data require reinterpretation. The new data reported here add to the database on igneous activity in the region so that the formation of crustal components is documented at 3850–3800, 3750–3700, ca. 3630, 3348, and 3200 Ma. This crustal instability may reflect the lack of an early mantle keel that was not fully established until the 2740–2702 Ma episode of metamorphism and ductile flow. A thin-skinned protocrust with multiple ages of intrusion and metamorphism, possibly driven by plume-related heat from below, i.e., multistage crustal recycling rather than competent plate interactions, is suggested for the formation of these Archean gneisses.