Implications of Preliminary Subsidence Analyses for the Parnaíba Cratonic Basin

Rodríguez Tribaldos, Verónica and White, Nicky (2018) Implications of Preliminary Subsidence Analyses for the Parnaíba Cratonic Basin. In: Cratonic Basin Formation: A Case Study of the Parnaiba Basin of Brazil. Special Publications, 472 (472). Geological Society, London, pp. 147-156.

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Cratonic sedimentary basins are underlain by thick lithosphere and subside over hundreds of millions of years. The driving mechanism for these basins remains enigmatic due to the paucity of crustal-scale constraints. To address this shortcoming, an integrative study of the Parnaíba cratonic basin of NE Brazil is underway. We summarize field observations, well-log information, seismic reflection profiles and subsidence analyses with the objective of shedding light on possible basin-forming mechanisms. Lithological descriptions and borehole logs reveal a stratigraphic succession that consists of interbedded shallow marine and continental deposits. On seismic reflection profiles, this succession is divided into packages of relatively undisturbed reflections bounded by basin-wide disconformities. These disconformities are manifest as bright, rugose reflections that probably represent buried palaeo-landscapes. Backstripped and water-loaded subsidence curves calculated from boreholes distributed throughout the basin show that tectonic subsidence decreases exponentially over c. 350 Ma. A simple model suggests that this subsidence pattern agrees with a thermal time constant of 70–100 Ma, placing a significant constraint on the likely basin-forming mechanism. This background trend is punctuated by minor increases in subsidence that follow basin-wide erosional disconformities. These departures could be indicative of transient epeirogenic uplift events caused by changing patterns of dynamic topography.

Item Type: Book Section
Uncontrolled Keywords: 2017AREP; IA73
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
12 - PhD
Volume: 472
Page Range: pp. 147-156
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 15 Feb 2018 16:51
Last Modified: 13 Feb 2019 12:31

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