Braz. J. Geol. vol.46 número2

he Canastra Group, within the studied area, is represented only by the Paracatu formation quartzites and phyllites, thrusted over the carbonatic-pelitic rocks of the Vazante

Samples in the lower organic-rich bed in HV-44 have high DOP T and very high Fe T /Al, sug- gesting inhospitable, anoxic conditions during the depo- sitions of these sediments

(A) Seismic facies A, interpreted as shelf-margin deltas/shoreface deposits; (B) seismic facies B, interpreted as slope clinoforms with tangential (oblique) geometry; (C)

In Figure B, a detail of A, the Fe dendrites (brown area) are in the porous chalcedony matrix with green mineral and Mn dendrites in massive chalcedony, separated by a domain of

(2012), based on OSL data, airmed that the anastomosed style has already been consolidated around 7,500 ± 850 and 3,400 ± 600 years, thus forming the islands complexes on the

Given those prior studies, this work sought to charac- terize the geometry of the diabase sills of the Serra Geral Formation, Early Cretaceous age, which occur in the strati-

he presence of agpaitic rocks (i.e., nepheline syenites and phonolites with molar (Na 2 O+K 2 O)/Al 2 O 3  > 1 and complex silicates of Zr, Ti, REE, and F and others vol-

TSNB: Trato de Sistemas de Nível Baixo; TST: Trato de Sistemas Transgressivo; TSNA: Trato de Sistemas de Nível Alto; TSRF: Trato de Sistemas de Regressão Forçada; SRM: