Tectônica transcorrente Mesozoica-Cenozoica no Domo de Lages - Santa Catarina

Abstract

Revista Brasileira de GeociênciasABSTRACT Mesozoic-Cenozoic transcurrent tectonics in the Lages Dome, Santa Catarina. This work presents the multiscale study of structural lineaments that affect alkaline rocks associated to the Lages Dome, situated in the Eastern edge of the Paraná Basin, Santa Catarina state, Brazil. We analyzed satellite images (Landsat-TM) and Shuttle Radar Topography Mission (SRTM) project and carried out structural studies of alkaline rocks in quarries of the dome. The results show correlation between the lineaments extracted from the images and faults analyzed in quarries, especially around the NS directions (NNE to NNW) and EW (ENE to ESE) and, secondarily, NE and NW. These structures are largely related to reactivation of basement discontinuities. The first two directions correspond to dextral and sinistral transcurrent faults, respectively. Formation of these structures is compatible with a field of tension with axis oriented NE-SW, whose age ranges from the Late Cretaceous and Tertiary.

Reativation of Taxaquara Fault and its morphotectonic influence on the evolution of Jordão River catchment, Paraná, Brasil

“…The age of the D1 event is uncertain, since two NE-SW direction deformation events occurred between the development of zones I and II, one taking place between the end of the Upper Cretaceous and the Eocene (Riccomini 1995a, Roldan 2007, Machado et al 2012 and the other during the Oligocene (Riccomini 1989). It is possible that these two events may in fact correspond to a single progressive event acting throughout the Paleogene, intercalated by a NW-SE distensive/transtensive phase (inversion of σ1 and σ2) which would result in the generation of the tafrogenic basins of southeast and south Brazil, although not significantly deforming Paraná Basin.…”

“…Previous studies concerning Cenozoic brittle deformation in Paraná Basin (Rostirolla et al 2000, Strugale et al 2004, Roldan 2007, Machado et al 2012 were considered, but none of them had the temporal and tensor analyses of these deformations as their main objectives. It was therefore necessary to proceed with a more detailed investigation of the faults and their related structures, correlating them whenever possible with the studies accomplished in the tafrogenic basins of southern Brazil (Campanha et al 1985, Riccomini, 1989, 1995b, Salamuni et al 2004, where most of the works on both the Cenozoic and Neotectonic periods are concentrated.…”

Mineralogy and genesis of soils developed from ultrabasic and alkaline rocks of Lages Alkaline Complex, Brazil

“…The study was carried out with samples of five soil profiles, all developed from rocks of the Lages Alkaline Complex (Nepheline syenite -P1; Kimberlites -P2 and P3); Trachyte -P4, and; Phonolite -P5). The formation comprises alkaline and ultrabasic rocks resulting from late magmatism occurring around 75 Ma BP (Machado et al, 2012). The outcrops of the rocks occur as intrusions amid the Gondwana sedimentary rocks in the vicinity of the Serra Geral Formation escarpments.…”

“…In the region of Plateau of Lages, SC, lies the Lages Alkaline Complex (Complexo Alcalino de Lages) (CPRM, 2014), a formation composed of intrusions of alkaline and ultrabasic rocks. Although they occupy a small geographic extension, the rocks in the complex are described by Scheibe (1986) as peculiar, with great lithological diversity, where phonolites, nepheline syenites, olivine-melilithites, lamprophyres, in addition to carbonatites, kimberlites, and breccia pipe stand out (Machado et al, 2012).…”

Caracterização bidimensional de fraturas naturais de tração em bacias sedimentares: Algumas implicações para o fraturamento hidráulico estimulado

“…(Freitas et al, 2006;Strugale et al, 2007;Reginato & Strieder, 2006;Nummer et al, 2014;Jacques et al, 2015;Strieder et al, 2015;Santos et al, 2019). Salvo exceções (Freitas et al, 2006;Santos et al, 2019) (Machado et al, 2012e Jacques et al, 2015. A direção dos diques de lamprófiros, tal como as relações de corte das falhas, indicaria uma idade neocretácea a paleógena desse evento.…”