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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

New thermocronological data of the Cretaceous-Cenozoic clastic sequences from the VINCHINA basin: Linkage between burial, exhumation and thermal flow variations

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Author(s):
Wunderlin, Cecilia [1] ; Collo, Gilda [1] ; Parra, Mauricio [2] ; Ezpeleta, Miguel [1] ; Sanchez Nassif, Francisco [1] ; Flores, Marlene [2] ; Sobel, Edward R. [3] ; Glodny, Johannes [4]
Total Authors: 8
Affiliation:
[1] Ctr Invest Ciencias Tierra CICTERRA, Consejo Nacl Invest Cient & Tecnol CONICET, Av Velez Sarsfield 1611, X5016CGA, Cordoba - Argentina
[2] Univ Sao Paulo, Inst Energy & Environm IEE, BR-05508010 Sao Paulo - Brazil
[3] Univ Potsdam, Inst Geowissensch, Karl Liebknecht Str 24-25, D-14476 Potsdam - Germany
[4] GFZ German Res Ctr Geosci, Bldg B, D-14473 Potsdam - Germany
Total Affiliations: 4
Document type: Journal article
Source: Journal of South American Earth Sciences; v. 105, JAN 2021.
Web of Science Citations: 0
Abstract

New apatite fission track (AFT) and (U-Th)/He (AHe) data from two sections recording Cretaceous-Cenozoic clastic successions (La Flecha - La Troya Sur creeks) in the northern sector of the Central Precordillera of Argentina are presented. The results show that the Cienaga del Rio Huaco, Puesto la Flecha and Vallecito Fms. would have crossed the 60 degrees C isotherm during burial, while the middle sector of the Vinchina Fm. would not have reached temperatures higher than 55 degrees C. Multimethod inverse thermal modeling suggests that the AFT ages of all the studied levels would not have been completely reset and allow inferring that the partial retention zone for the AHe system (AHe-PRZ) would have been reached during the Miocene in levels between the Vallecito and Vinchina Fms. Our 1D-modeling results for the Cienaga del Rio Huaco, Puesto la Flecha and Vallecito Fms. show that the maximum temperature would have been reached at similar to 15 Ma, with a sedimentary thickness of similar to 2750 m and a heat flow of 65 mW/m(2). From these data, a geothermal gradient of similar to 27 degrees C/km at this time could be inferred. In turn, the Vinchina and Zapallar Fms. would have reached their maximum temperature at similar to 2 Ma, under a cooler thermal regime (20 mW/m(2)) and with an estimated geothermal gradient of <15 degrees C/km. Thus, a complex time-temperature trajectory is proposed. Maximum and cooling temperatures reached by each unit do not correspond in all cases to the maximum burial and exhumation times. Comparison of the thermal modelling from this work with those carried out by other authors for sections immediately to the north allows us to infer that the thermal regime within the Vinchina basin has important lateral variations. Finally, AFT and AHe analyzes carried out in this work constitute a baseline database of the thermal regime, which is necessary for future multiproxies studies that are being done to evaluate the preservation of primary thermal signals, and thus check their reliability for pealeoclimatic and paleoenvironmental interpretations. (AU)

FAPESP's process: 16/50441-1 - Multi-method paleothermometry in sedimentary basins
Grantee:Mauricio Parra Amézquita
Support Opportunities: Regular Research Grants