Mapa Geologico del Complejo Precambrico Sur del Paraguay: Texto explicativo / Geologia de la Region Central del Paraguay Oriental Fanerozoico

About this book

Language: Spanish

This volume of Geologisches Jahrbuch contains two works.

Geological Map

The Tebicuary Complex of southern Paraguay consists of highly metamorphosed and intensely folded rocks of the Suite Metamórfica Villa Florida of the Lower Proterozoic Transamazónico Cycle (2000 ma). Fold axes trend NE-SW. It is unconformably overlain by the low grade clastic metasediments of the Group Paso Pindö, which were folded (NW-SE fold axes) during the main phase of the Upper Proterozoic Brasiliano Cycle (600 ma). The rocks of the Tebicuary Complex were partly refolded.

Both rock series were intruded posttectonically by the Suite Magmática Caapucú (531 ma). The Tebicuary Complex belongs to the Rio de la Plata Cratón, the rocks of the Brasiliano Cycle in Paraguay form part of the Paraguay-Araguaia Belt. The geological map of the Southern Precambrian Complex of Paraguay 1:250,000 is attached to this paper.

Geology of the central Region of Eastern Paraguay Phanerozoic

Abstract: A mapping project was conducted in the central area of East Paraguay as part of a Technical Cooperation between the Dirección de Recursos Minerales (DRM) and the Federal Institute for Geosciences and Natural Resources (BGR). The aim of this project was to support the establishment of a geological service. Five map sheets at a scale of 1:100,000 were geologically recorded for the first time and a further sheet was interpreted with the help of satellite images.

The results are summarised and represented at a scale of 1:250,000 in this thesis. The work also focuses on the description and stratigraphic classification of the chiefly phanerozoic units, as well as the classification of magmatic activity. The predominant terrestrial sedimentation was occasionally interrupted by marine advances. Clastic sandstone prevails with few insertions of mudstone and limestone.

Apart from a few stratigraphic gaps, the sedimentary deposition continued relatively uninterrupted since the Ordovician Period. Fault block tectonics in the Mesozoic Era lead to graben formation and layer displacement. Basaltic intrusions and extrusions occurred at the same time. The activity shifted from SE to NW and from older to younger. This situation is interpreted as a development of a rift valley in association with the breakup of Gondwana and the opening of the South Atlantic.

Contents

Geological Map

1 Introducción 7
2 Investigaciones geológicas previas 9
3 Cuadro Geológico Regional 12
4 Descripción geogrâfica 13
5 Geologia del Complejo Precámbrico Sur 14
5.1 El Complejo Río Tebicuary 14
5.2 Grupo Paso Pindó 19
5.3 Suite Magmática Caapucú 22
6 Aspectos regionales 28
7 Bibliografía 29
8 Abreviaturas 32

Geology of the central Region of Eastern Paraguay Phanerozoic

1 Introducción 39
2 Descripción geológica y geográfica 40
3 Estratigrafía 43
3.1 Basamento 43
3.2 Grupo Caacupé (Qrdovicico) 44
3.3 Grupo Itacuburi (Silúrico) 46
3.4 Formación Arroyos y Esteros (Silúrico/Devónico) 46
3.5 Grupo Coronet Oviedo (Carbonífero) 47
3.6 Grupo Independencia (Pérmico) 47
3.7 Formaciön Misiones (Triásico, Jurásico) 48
3.8 Formaciön Ybytymi (Triásico, Jurásico) 48
3.9 Suite Sapucai (Cretácico Inferior) 48
3.10 Grupo Asunción (Cretácico Superior 49
3.11 Suite Ñemby (Terciario) 49
4 Tectónica 50
5 Resumen 51
6 Bibliografía 53
7 Abreviaturas 55

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