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• W2261713612 abstract "ABSTRACT Forty apatite samples of sandstone from ten exploration wells in the Scotian Basin, offshore Nova Scotia, Canada, were used for fission track analysis and thermal history reconstruction. The sample depths range from 1000 to 5500 m. Fission tracks in all apatite samples are at least partially annealed. Apatite fission track ages for the shallowest samples, from the Logan Canyon Formation, are older than their stratigraphic ages and therefore retain some record of cooling in the detrital source area. Samples from deeper formations (Missisauga, Mic Mac and Verrill Canyon) have apatite fission track ages younger than their stratigraphic ages (some give zero ages), indicating partial to total annealing of fission tracks in apatite. The degree of annealing in most samples modelled is significantly higher than would be expected given their present-day temperatures. This indicates that these samples experienced a thermal overprint; they have been hotter in the past than at present. Inverse modelling by a Constrained Random Search (CRS) technique was carried out on the six best data sets. The results indicate that strata at depths of 1650-2600 m in the modelled wells were heated to paleotemperatures of about 80-110°C at some time during the interval 100-40 Ma. The magnitude of the thermal overprint predicted (estimated) by the modelling ranges from 1° to 55Cdeg; among the five wells modelled. Zircon fission track data from fifteen samples in four wells do not constrain burial temperatures. These data indicate a mixed provenance for the sediments. RESUME Quarante echantillons d'apatite de gres provenant de dix puits d'exploration du bassin Scotian, au large de la Nouvelle-Ecosse, au Canada, ont servi pour l'analyse des traces de fission et la reconstruction de l'evolution thermique. La profondeur des echantillons varie de 1 000 a 5 500 metres. Les traces de fission dans tous les echantillons d'apatite sont au moins partiellement recuites. Les ages des traces de fission d'apatite pour les echantillons les moins profonds, de la Formation Logan Canyon, sont anterieurs a leurs ages stratigraphiques et par consequent, conservent quelques temoignages du refroidissement dans les regions detritiques formatrices. Les echantillons provenant de formations plus profondes (Missisauga, Mic Mac et Verrill Canyon) donnent des traces de fission d'apatite plus jeunes que leurs ages stratigraphiques (quelques-uns donnent zero pour age), indiquant une recuisson partielle a complete des traces de fission d'apatite. Le degre de recuisson dans la plupart des echantillons modeles est significativement plus eleve qu'il ne serait attentu etant donne leurs temperatures contemporaines. Ceci indique que ces echantillons ont subi une superposition thermique d'empreintes; ils ont auparavant ete plus chauds. La modelage inverse par la technique Constrained Random Search (CRS) (recherche au hasard contrainte) a ete effectue sur les six meilleurs jeux de donnees. Les resultats indiquent que des couches a des profondeurs de 1650-2600 metres dans les puits modeles ont ete chauffes a des paleotemperatures de 80-110°C a une epoque durant l'intervalle de 100-40 Ma. L'ampleur de la superposition thermique d'empreintes prevue (estimee) par les ecarts de modelage de 1° a 55°C pour les cinq puits modeles. Les donnees de traces de fission de quinze echantillons de zircon de quatre puits ne contraignent pas les temperatures d'enfouissement. Ces donnees indiquent une provenance mixte des sediments. Traduit par Marie Louise Tomas" @default.
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• W2261713612 date "1995-06-01" @default.
• W2261713612 modified "2023-09-23" @default.
• W2261713612 title "Implications of Apatite Fission Track Analysis for the Thermal History of the Scotian Basin, Offshore Nova Scotia, Canada" @default.
• W2261713612 doi "https://doi.org/10.35767/gscpgbull.43.2.127" @default.
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