Metrics details
Lithosphere of cratons and orogens generally reacts differently to tectonic events
Although these differences are mostly clear during the orogenic phases
understanding how they respond to tectonic reactivation is still challenging
we report the first detailed apatite fission-track (AFT) study pinpointing the gradual transition between cratonic and orogenic lithosphere
using the case study of the São Francisco craton (SFC) and the adjacent Araçuaí-West Congo Orogen (AWCO)
The collision that built the AWCO partially affected the inherited rift structures of the Paramirim Aulacogen
embedded in the São Francisco-Congo paleocontinent
Our data reveal a differential Phanerozoic exhumation between closely interspaced areas affected and not affected by the AWCO deformation
Samples from the SFC present slow and protracted basement cooling during the Phanerozoic
while samples from the orogen display rapid exhumation since the Eocene
An intermediate ~ N–S zone of c.40 km shows lower magnitude basement cooling during the Cenozoic
possibly because the propagation of AWCO deformation decreases towards the craton interior
the Rio Pardo salient is the main reactive structure and probably results from the deformation of a master fault
we show how the magnitude of Phanerozoic denudation may be deeply associated with previous events of lithosphere weakening
The objective of our study is to gain deeper insights into the exhumation of the basement in an area of transition between the SFC and the AB
during subsequent Phanerozoic tectonic events and
verify how different types of lithosphere exert control on later basement exhumation
the ED was etched using 40% HF for 40 min at 21 °C in order to reveal induced fission tracks
continuous, undisturbed, and slow cooling from the Paleozoic onwards; identified in the northernmost samples (TJ 21–26);
Paleozoic to Mesozoic fast to moderate cooling with subsequent, late c.50 °C cooling during the Eocene–present, as evidenced by samples from the Rio Pardo salient zone (TJ 09–16 and TJ 28–34); and
continuous and slow cooling from the Paleozoic to the Cenozoic, followed by c.35 °C of rapid cooling during the Eocene–present, as observed for the southernmost samples (TJ02–09) and samples geographically between the Rio Pardo salient and sample site TJ 21 (TJ17–20).
we can conclude that the cratonic region of the Paramirim Aulacogen inherits the rigidity from the SFC
epirogenic uplift during the opening of the South Atlantic was mitigated as well as the erosional response to this process
resulting in an almost stable thermal structure
we suggest that during the Eocene to present
likely partially contributing as a source of sediments to the above-mentioned deposits
supporting the location of the master fault
This final rapid cooling event most probably (partially) erased evidence from previous thermal events
including signals from West Gondwana break-up around 130 Ma
This latter event can however still be observed in three of our thermal history models (TJ 14–16)
(a) AFT age distribution map of the study area identifying zones of tectonic reactivation with basement exhumation and stability. (b) Representative models for each zone and indication of the phases of Andean orogeny and West Gondwana break-up. The map was created using, ArcGIS 10.4.1 (https://www.esri.com) and Corel Draw Graphics Suite 2018 (http://www.coreldraw.com)
AFT data from the São Francisco craton and adjoining Araçuaí belt in the Paramirim Aulacogen area (eastern Brazil) elucidate the differential behavior of the cratonic and non-cratonic lithosphere during the Phanerozoic exhumation of this region
thermal history modelling of the basement rocks exhibits slow and protracted cooling during the Phanerozoic
consistent with the rigid cratonic lithosphere of the São Francisco Craton
in the interior of the Paramirim aulacogen
inherited from the Ediacaran–Cambrian collision
and it is considered mostly part of the Araçuaí Belt but with less penetrative deformation as to the orogen proper
The thermochronological data proved to be highly useful in determining the decreasing magnitude of reactivation along the craton—orogen boundary and can be used as a tool to trace and distinguish cratonic areas weakened by later deformation events
All data generated or analyzed during this study are included with the initial submission of the article in the form of Supplementary Information and are available on request
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We acknowledge CAPES-Brazil (CAPESPrint 88887.371253/2019-00) for financial support (JDG) during the field work
Jocelyn Barbarand and two anonymous reviewers for their critical comments that undoubtedly contributed to this paper
and funding acquisition for the field trip
was responsible during the process of formal analysis
The authors declare no competing interests
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations
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DOI: https://doi.org/10.1038/s41598-022-06419-w
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