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• W2079777961 abstract "The relationships between the cratonic area and orogenic belts of the southern part of the state of Minas Gerais (Brazil) are analyzed using data from a recent Bouguer anomaly map. The interpretation was carried out using inverse-anomaly approach and statistical analysis. The stable area is characterized by elongate anomalies trending NNE-SSW which correspond to a higher level of the basement under the upper Precambrian sedimentary cover (Bambui and Macaübas groups). They can be related to rejuvenated NNE-SSW-trending fractures. The gravity trends are either deformed or interrupted over the Brasilian fold belt where an important negative linear anomaly is present. This anomaly is produced by a thick sequence of folded sedimentary or metasedimentary terrains which can be interrupted as miogeoclinal units. The Alfenas mobile belt is characterized by a strong positive anomaly, probably associated with heavy infracrustal rock complexes (granulites, charnockites). A crustal thickening, probably associated with a pre-Brazilian continental collision, can be inferred from a long-wavelength linear negative anomaly. Nous présentons une carte des anomalies de Bouguer du Sud de l'Etat de Minas Gerais réalisée à partir des données déjà existantes et d'un levé récent (2000 stations) effectués dans le cadre des accords CNRS-CNPq avec la collaboration de l'ORSTOM et du DNPM∗. Lánalyse des anomalies gravimétriques et de leur direction amène à distinguer un domaine cratonique et des zones orogéniques. L'interprétation à l'aide de l'analyse statistique et par problème inverse des anomalies allongées NNE—SSW qui caractérisent la zone stable montre la présence sous la couverture sédimentaire du Précambrian supérieur (groupes Bambui et Macaübas) de zones hautes du socle liées à de grandes fractures anciennes NNE—SSW ayant rejouées à plusieurs époques. On note également des discontinuités NW—SE importantes. Ces directions sont soit déformées, soit brutalement interrompues au niveau des plissement brésiliens auxquels est associée une anomalie négative linéaire importante. Cette anomalie peut être décomposée en une anomalie liée à un sillon de terrains sédimentaires ou métasédimentaires plissés correspondant à des dépôts miogéosynclinaux (Miogéoclinaux) et en une autre de grande longueur d'onde correspondant probablement à un épaississement crustal. Cette structure profonde peut être la conséquence d'une tectonique de collision antébrésilienne contemporaine de la mise en place tectonique des granulites et charnockites de la ceinture mobile Alfenas dont la gravimétrie permet d'apprécier l'importance." @default.
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• W2079777961 date "1981-07-01" @default.
• W2079777961 modified "2023-09-26" @default.
• W2079777961 title "Signification structurale des anomalies gravimetriques de la partie sud du craton de Sao Francisco (Bresil)" @default.
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• W2079777961 doi "https://doi.org/10.1016/0040-1951(81)90101-3" @default.
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