Magnetization of the oceanic crust: TRM or CRM?

A model was proposed in which chemical remanent magnetization (CRM) acquired within the first 20 Ma of crustal evolution may account for 80% of the bulk natural remanent magnetization (NRM) of older basalts. The CRM of the crust is acquired as the original thermoremanent magnetization (TRM) is lost through low temperature alteration. The CRM intensity and direction are controlled by the post-emplacement polarity history. This model explains several independent observations concerning the magnetization of the oceanic crust. The model accounts for amplitude and skewness discrepancies observed in both the intermediate wavelength satellite field and the short wavelength sea surface magnetic anomaly pattern. It also explains the decay of magnetization away from the spreading axis, and the enhanced magnetization of the Cretaceous Quiet Zones while predicting other systematic variations with age in the bulk magnetization of the oceanic crust. The model also explains discrepancies in the anomaly skewness parameter observed for anomalies of Cretaceous age. Further studies indicate varying rates of TRM decay in very young crust which depicts the advance of low temperature alteration through the magnetized layer

La frontière maritime du Québec dans le golfe du Saint-Laurent

Les compétences territoriales d'un Québec souverain s'étendraient, dans le golfe du Saint-Laurent, à des espaces maritimes — mer territoriale, zone contiguë, zone économique exclusive et plateau continental — dont les largeurs seraient mesurées à partir de lignes de base droites ou dites normales. Des zones de chevauchement seraient alors créées, soumises à la délimitation d'une frontière selon les règles du droit international. À la lumière des solutions retenues dans la jurisprudence et la pratique des Etats, et compte tenu des types de facteurs pertinents, diverses méthodes de délimitation sont proposées.If it were to become a sovereign state, Québec would benefit from the addition of maritime areas — territorial sea, contiguous zone, exclusive economic zone, continental shelf — the width of which would be measured from straight or normal baselines. Overlapping areas would then exist and be subject to the delimitation of maritime boundaries in accordance with international law. In light of cases and state practice, and given relevant circumstances, various methods of delimitation are suggested