U-Pb and Lu-Hf zircon geochronology of the Cañadón Asfalto Basin, Chubut, Argentina: Implications for the magmatic evolution in central Patagonia

The Cañadón Asfalto basin, central Chubut, Argentina, comprises a volcano-sedimentary sequence related to the opening of the Atlantic Ocean during Mesozoic times. The Lonco Trapial, Cañadón Asfalto and Cañadón Calcáreo formations are the main units related to the evolution of this basin. The Las Chacritas and Puesto Almada members are distinguished in the Cañadón Asfalto Formation. LA-HR-ICP-MS U-Pb and Lu-Hf data on zircon were obtained on these units. The Lonco Trapial Formation gave a weighted average age of 172.3±1.8 Ma. A pyroclastic level from the Las Chacritas Member gave a weighted average age of 168.2±2.2 Ma. Two U-Pb concordant ages of 160.3±1.7 Ma on a laminated tuffite and 158.3±1.3 Ma on a pyroclastic level were obtained for the Puesto Almada Member. Two maximum depositional ages constrain the sedimentary provenance areas for the basin: 1) A sample from the Sierra de la Manea range, where a controversial unit related either to the Cañadón Asfalto or to the Cañadón Calcáreo formation occurs, gave an age of 176.6±1.0 Ma. Two younger zircon crystals indicate that this unit may be related to the Cañadón Calcáreo Formation. 2) A sandstone with cross-stratification from the Puesto Almada Member gave a maximum depositional age of 173.6±6.4 Ma. In terms of U-Pb and Lu-Hf isotopes, two magmatic events are identified in central Patagonia: the Mamil Choique magmatic event characterized by negative εHf values around -5.0 and representing recycling during Permian times of Mesoproterozoic crust (TDM of ~1.5 Ga), and the Cañadón Asfalto magmatic event with negative (-8.2) to positive (+4) εHf values and Meso- to Neoproterozoic TDM between 1.5 and 0.8 Ga. The younger event is characterized by three main cycles: C1 related to the Lonco Trapial magmatism, C2 to the Las Chacritas volcanism, and C3 to the Puesto Almada volcanism. These cycles are related with Marifil, Chon Aike and El Quemado formations volcanics events of Patagonia and the Neuquén Basin during the Mesozoic.Fil: Hauser, Natalia. Universidade Do Brasilia. Instituto de Geociencias; BrasilFil: Cabaleri, Nora Graciela. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotopica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotópica; ArgentinaFil: Gallego, Oscar Florencio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; ArgentinaFil: Monferran, Mateo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; ArgentinaFil: Silva Nieto, Diego Gonzalo. Secretaria de Industria y Mineria. Servicio Geológico Minero Argentino. Instituto de Geología y Recursos Minerales. Dirección de Geología Regional; ArgentinaFil: Armella, Claudia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotopica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotópica; ArgentinaFil: Matteini, Massimo. Universidade Do Brasilia. Instituto de Geociencias; BrasilFil: Aparicio Gonzalez, Pamela Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotopica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotópica; ArgentinaFil: Pimentel, Marcio. Universidade Do Brasilia. Instituto de Geociencias; BrasilFil: Volkheimer, Wolfang. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Reimold, W. U.. Universität zu Berlin; Alemani

FORROST: Advances in On-Orbit Robotic Technologies

Orbital robotics is receiving growing attention worldwide for applications in servicing and repositioning of partially or fully defective satellites. In this paper, we present the scope and main results of a four-year research project, which aimed at developing necessary robotic technologies for such applications. The scope is two-fold, since we address both the human-operated robotic operational mode, referred to in robotics as forcefeedback teleoperation, as well as the alternative autonomous mode, for the specific task of approaching and grasping a freetumbling target satellite. We present methodological developments and experimental as well as numerical validations in the fields of tele-communications, computer vision, robot and spacecraft control and system identification. The results of this work constitute important advances in the fundamental building blocks necessary for the orbital applications of interest

Guidelines for depot antipsychotic treatment in schizophrenia

These guidelines for depot antipsychotic treatment in schizophrenia were developed during a two-day consensus conference held on July 29 and 30, 1995 in Siena, Italy. Depot antipsychotic medications were developed in the 1960s as an attempt to improve the long-term treatment of schizophrenia (and potentially other disorders benefiting from long-term antipsychotic medication). Depot drugs as distinguishable from shorter acting intramuscularly administered agents can provide a therapeutic concentration of at least a seven day duration in one parenteral dose. The prevention of relapse in schizophrenia remains an enormous public health challenge worldwide and improvements in this area can have tremendous impact on morbidity, mortality and quality of life, as well as direct and indirect health care costs. Though there has been debate as to what extent depot (long-acting injectable) antipsychotics are associated with significantly fewer relapses and rehospitalizations, in our view when all of the data from individual trials and metaanalyses are taken together, the findings are extremely compelling in favor of depot drugs. However in many countries throughout the world fewer than 20% of individuals with schizophrenia receive these medications. The major advantage of depot antipsychotics over oral medication is facilitation of compliance in medication taking. Non-compliance is very common among patients with schizophrenia and is a frequent cause of relapse. In terms of adverse effects, there are not convincing data that depot drugs are associated with a significantly higher incidence of adverse effects than oral drugs. Therefore in our opinion any patient for whom long-term antipsychotic treatment is indicated should be considered for depot drugs. In choosing which drug the clinician should consider previous experience, personal patient preference, patients history of response (both therapeutic and adverse effects) and pharmacokinetic properties. In conclusion the use of depot antipsychotics has important advantages in facilitating relapse prevention. Certainly pharmacotherapy must be combined with other treatment modalities as needed, but the consistent administration of the former is often what enables the latter.SCOPUS: re.jinfo:eu-repo/semantics/publishe