000			02869nmc a2200217 4500
005			20260520010331.0
008			260224s xxu
082			_aCD I116 64 0015469
245	0	0	_aEl límite devónico-carbonífero en la Cuenca de Tarija, Bolivia. Su interpretación a partir de datos del subsuelo en el piedemonte chaqueño
270			_a11/11/2016 ; 11/11/2016
300			_a18 p.
520			_aThe Devonian-Carboniferous limit in the Tarija Basin of Bolivia. Its interpretation from subsurface information in the Chaco Plain The Devonian-Carboniferous boundary has a large importance in the Bolivian Sub-Andean and Northwest of Argentina. This boundary not only reflects changes in the paleo-climate and sedimentary environment, but can also act as a top seal for hydrocarbon accumulations in the reservoirs of Iquiri Formation. Several factors complicate its precise identification, as its lithological variability and palynological ages, which often are not accurate enough, and the presence of strong erosional unconformities. The analysis developed presents a possible model for this boundary and overlying units in a sector of the piedmont zone and Subandino Boliviano foothills between 18°30’ and 20°S. It is based on detailed analysis of exploration wells data located in the Tajibo-Tacobo area and two measured sections in the Quebrada Taputá (Serranía de Charagua), the Iquiri Formation is exposed, as well as its relation to the units deposited above. Overlying the Iquiri Formation three unconformity-bounded sedimentary sequences with distinctive litho-stratigraphic characteristics were identified. The unconformity D1 is chronologically located in the uppermost Devonian. It separates the Iquiri Formation, of shallow shelf marine deposits, from Sequence 1 which is part of a new cycle of sedimentation in a marine depositional environment with glacial and fluvial influence. The unconformity D2, is the boundary between Sequence 1 and Sequence 2, although in some sectors this unconformity can completely erode Sequence 1, reaching the Iquiri Formation. This limit marks the boundary between the Devonian and Carboniferous The unconformity D3, is a highly erosive surface of early Carboniferous age above this discontinuity sandstones of widespread distribution in the Tarija basin were deposited. These major discontinuities are assigned to base level changes, probably caused by climatic factors.
773			_g
942			_cCONGTP
100	1		_aZubieta R., David _92131
100	1		_aReynaldi, Juan Manuel _955758
100	1		_aVergani, Gustavo Dardo _955759
111	2		_aCongreso de Exploración y Desarrollo de Hidrocarburos (9no. : 2014 nov. 3-7 : Mendoza) _954287
999			_c189829 _d189829
856			_uhttps://biblioteca.iapg.org.ar/ArchivosAdjuntos/CONEXPLOR2014/499-Limitedevonicocarbonifero.pdf