Paleogeographic development of the east Laurentian margin: Constraints from U-Pb dating of detrital zircons in the Newfoundland Appalachians
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Research Article| September 01, 2001 Paleogeographic development of the east Laurentian margin: Constraints from U-Pb dating of detrital zircons in the Newfoundland Appalachians Peter A. Cawood; Peter A. Cawood 1Tectonics Special Research Centre, School of Applied Geology, Curtin University, GPO Box U1987, Perth 6845, Western Australia, Australia Search for other works by this author on: GSW Google Scholar Alexander A. Nemchin Alexander A. Nemchin 1Tectonics Special Research Centre, School of Applied Geology, Curtin University, GPO Box U1987, Perth 6845, Western Australia, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Peter A. Cawood 1Tectonics Special Research Centre, School of Applied Geology, Curtin University, GPO Box U1987, Perth 6845, Western Australia, Australia Alexander A. Nemchin 1Tectonics Special Research Centre, School of Applied Geology, Curtin University, GPO Box U1987, Perth 6845, Western Australia, Australia Publisher: Geological Society of America Received: 28 Feb 2000 Revision Received: 20 Nov 2000 Accepted: 13 Feb 2001 First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2001) 113 (9): 1234–1246. https://doi.org/10.1130/0016-7606(2001)113<1234:PDOTEL>2.0.CO;2 Article history Received: 28 Feb 2000 Revision Received: 20 Nov 2000 Accepted: 13 Feb 2001 First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Peter A. Cawood, Alexander A. Nemchin; Paleogeographic development of the east Laurentian margin: Constraints from U-Pb dating of detrital zircons in the Newfoundland Appalachians. GSA Bulletin 2001;; 113 (9): 1234–1246. doi: https://doi.org/10.1130/0016-7606(2001)113<1234:PDOTEL>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract An upper Neoproterozoic to Ordovician Laurentian margin sedimentary sequence in the Newfoundland Appalachians records a cycle of ocean opening and closing. U-Pb dating by ion microprobe of 341 detrital- zircon grains from six samples from this sequence yielded ages from 3592 ± 5 Ma to 572 ± 14 Ma. Three of the analyzed samples are from rift-related formations, two are from drift-related formations, and one is from a foreland-basin unit. The U-Pb data allow grouping of the zircons into four major age components: (1) Archean grains with a maximum age frequency between 2850 and 2600 Ma, (2) Paleoproterozoic grains ranging from 1950 to 1750 Ma, (3) Mesoproterozoic to early Neoproterozoic grains ranging in age between 1450 and 950 Ma, and (4) Neoproterozoic grains ranging between 760 and 570 Ma. The relative proportions of these four age components vary among samples. Mesoproterozoic detritus is present in all samples, whereas Neoproterozoic detritus is restricted to two of the three rift-related samples. Two samples— one from a rift-related formation and one from a drift-related formation, but both lying at the base of their stratigraphic column—lack Paleoproterozoic and Archean detrital zircons.Potential source regions for the detrital zircons occur within the Laurentian hinterland: zircons of Archean age correspond to the age of rock units formed during major magmatic and tectonothermal pulses in the Superior craton, zircons with Paleoproterozoic ages correspond to the ages of orogenic belts marginal to the craton (e.g., Ungava, New Quebec, and Torngat), Mesoproterozoic zircons correspond to the ages of lithologies from the Grenville orogen, and Neoproterozoic zircons are the age of rift-related igneous activity along the Laurentian margin that is now preserved within the Appalachian orogen. The youngest grains in the rift-related sedimentary rocks yield ages of 580–570 Ma and provide a maximum age for accumulation of the Newfoundland sedimentary sequence. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,002 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,016 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découle