La Dorsal Asunción - Río Grande: Un Altofondo Regional Entre Las Cuencas Paraná (Brasil, Paraguay Y Uruguay) Y Chacoparanaense (Argentina)

Abstract

Rcvista Brasilcira de GcocicnciasEduardo A. Resumen La Dorsal Asu ncio n -Rio G rande (DARG) cs un accidcme tcctonico de primcra magnitud que con stituyo un a ltofondo regional rcspon sable de la com part imc ntalizacion de la scdirncntacion post-Permico-Triasico de las cuencas Parana (Brasil, Paragu ay y Urug uay ) y de 1' 1 Llanura Ch acoparancnse (A rge nt ina). El ext reme septentrional de la DA RG. ell Paraguay. csta repr osentado pm cI A lto Asuncio n materiali zado por una vcn tana del busam cnto cristalino (Craton Tebi cu ary) buzantc hacia cI SSE Y orlado pOl' sccuencias sed imentarias pale ozoic as y mesozoicas. Com mr iamc nrc. el extreme austra l de la DAR G. csta con stit uido pOl' el A lto de Rio Gra nde, locali zado en cI Estado de Rio Grand e do Sui, Bras il; y esta igualmente caractc rizado pol' un nsomo de basamen to cr istalino orlad o por secuencias Palco zcicas y Mesozoicas, pero buzante hacia cJ NN W. EI tramo intermcdio . en los terri torios de A rgen tina y Urug uay, esta mcnos cxpucsto y cxige una co rrclac ion reg ional med iante informacion de subsuclo. La DARG separa dos gmndcs ambie ntcs dcpositacionalcs que correspo nde n a los s iguientes ambitos de la Cuenca Parana, hacia cI orie nte. mejor ex puesta y las di ferent es cuencas sed imentarias cubiertas por la L1anura Cbacopara ncnse, hacia el occi dente. Poria disposicion gcog rafica. cin cm atica y cro no logia de S lI cvolu cion. su origcn puedc corrclacionarsc co n la tecton ica con vcrgc ntc del Paleo zo ico supe rior qu e estruc turo a las Sierra s Austra les de Buenos A ires (Arge ntina ). Finalm cntc, la cva luacion de la influencia de la DARG con tribuyc COil la com prcnsion de los mecani sm os tcc toscd imcntarios que acusa n las sec uencias constituye ntes de los re llenos de las cuencas de la Llanura Chacoparanense y Parana. Palab ras ctaves ;

Subsurface geological modeling of Corrientes province (NE Argentina) and its relationships with the Guaraní Aquifer system function

“…In particular, during the Mesozoic, it seems to have been a structural block with topographic expression, controlling the thinning of the GAS units and avoiding basaltic flow accumulation. This would be consistent with the comments made by previous authors about the DARG evolution, Williams (1995) and Rossello et al (2006), whom confirmed the gradual tectonic uplift of DARG from Carboniferous. This NW structuring, coincident with the axial trace of the DARG, has interrupted the continuity of Corrientes and Curuzú grabens towards the NE, and those depocenters outline their continuity in the northeast of Corrientes province and all around Misiones province.…”

“…Its result shows a basement compartmentalized in structural blocks separated by large faults which cross all the volcano-sedimentary sequence. Indeed, they demonstrated that the central-west region of Corrientes shows the least thickness of basalts coinciding with the axial trace of the Dorsal Asunci on-Rio Grande (DARG) just as the GAS sediments are thinner such as suggested in regional maps by Gastmans et al (2012), corroborating this structure in the terms described by Rossello et al (2006).…”

“…3); b) the presence of the DARG linked to the regional set up of an ancient basement according to Rossello et al (2006), Veroslavsky (2012b) andLEBAC (2008). Both structural elements are also considered here as tectonic elements that controlled the volcano-sedimentary filling of the basin in Corrientes and, furthermore, with impact in the geological configuration and dynamics of the GAS in this region.…”

Conceptual and numerical modeling approach of the Guarani Aquifer System

“…Transmissivity (and for that matter hydraulic conductivity) is one of many aquifer parameters that vary with the scale of measurement. This issue is well documented in the literature (Sánchez-Vila et al, 1996;Nilsson et al, 2001). An in-depth analysis of this topic is well beyond the scope of this work.…”

Paleomagnetism of the Main South American Precambrian Cratons

“…The Río de la Plata Craton (RP) is located in southeastern South America (Figure 3a), covering the province of Buenos Aires in Argentina, most of the territory of Uruguay, and southern Brazil. A large part of the craton is overlayed by Phanerozoic sediments, forming the Chaco-Paranaense basin (e.g., Rossello et al, 2006), which makes it difficult to establish the actual extension of the craton (Dragone et al, 2017;Oyhantçabal et al, 2010;Rapela et al, 2007;2011;Santos et al, 2017). As a fact, the Precambrian rocks are exposed only in its eastern and southern parts (Figure 3).…”