“…Including data are: SRTM30 available in https://earthexplorer.usgs.gov/ , GEOSGB data available in http://geosgb.cprm.gov.br/ ; GIS data provided by CPRM available in http://www.cprm.gov.br/publique/cgi/cgilua.exe/sys/start.htm?infoid=3489&sid=58, and http://geowebapp.cprm.gov.br/ViewerWEB/index_recmin.html ). Figure 2 Azimuth 125° lineament based on earth’s anomalous magnetic field (AMF) modified from the literature 40 (used with permission of Elsevier, license # 4376530981073). …”
Section: Resultsmentioning
confidence: 99%
“… Azimuth 125° lineament based on earth’s anomalous magnetic field (AMF) modified from the literature 40 (used with permission of Elsevier, license # 4376530981073). …”
Section: Resultsmentioning
confidence: 99%
“…Is there a link between drainage compartmentalization and uplift controlled by intrusive magmatism? The magnetic signature of the Azimuth 125° lineament indicates a set of linear features with regional continuity in the subsurface, characterized by a higher magnetic susceptibility compared with surrounding host rocks 40 . The importance of this lineament as a system of deep crustal discontinuities serving as the main conduit for several alkaline intrusions along the azimuth axis has been confirmed recently 40 .…”
Section: Discussionmentioning
confidence: 99%
“…The magnetic signature of the Azimuth 125° lineament indicates a set of linear features with regional continuity in the subsurface, characterized by a higher magnetic susceptibility compared with surrounding host rocks 40 . The importance of this lineament as a system of deep crustal discontinuities serving as the main conduit for several alkaline intrusions along the azimuth axis has been confirmed recently 40 . The injection of dike-forming magma into the faults of the lineament occurred during two or three tectonic events: (i) between 950 and 520 Ma at two Brasiliano orogeny cycles, older (950–650 Ma) and younger (ca.…”
Section: Discussionmentioning
confidence: 99%
“…The injection of dike-forming magma into the faults of the lineament occurred during two or three tectonic events: (i) between 950 and 520 Ma at two Brasiliano orogeny cycles, older (950–650 Ma) and younger (ca. 700–520 Ma); (ii) at approximately 180 Ma, during the fragmentation of Gondwana; and (iii) at circa 90 Ma 40 . A compilation of the available ages of intrusions along Azimuth 125° indicates periods of intrusions, and consequently, uplifts and large-scale drainage compartmentalization between 91–72.4 Ma (Fig.…”
Interbasin arches between hydrographic systems have a heterogeneous geological origin, forming under the influence of several different geomorphological processes. Independent of the underlying processes, these arches compartmentalize present-day river basins, encompassing different water chemistries, habitat types, soil domains, potential energy and, on a geological/evolutionary time scale, aquatic life varieties in the ecosystem. Through most of its length, the water divide between the Amazonian, Paraná-Paraguay, and São Francisco river basins in central South America coincides with an Upper Cretaceous intracontinental igneous alkaline province. This magmatism, independent of its nature, caused intense crustal uplift and influenced hydrological networks at different scales: from continental-scale crustal doming to continental break-up, and finally to local-scale phenomena. The available ages for alkaline rocks indicate a well-defined time-interval between 72.4 to 91 Ma (concentrated between 76 and 88 Ma) period of uplift that contributed to large-scale drainage compartmentalization in the region. Here we show that uplift associated with intrusive magmatism explains the origin and maintenance of the divide between the Amazonian, Paraná-Paraguay, and São Francisco river basins.
“…Including data are: SRTM30 available in https://earthexplorer.usgs.gov/ , GEOSGB data available in http://geosgb.cprm.gov.br/ ; GIS data provided by CPRM available in http://www.cprm.gov.br/publique/cgi/cgilua.exe/sys/start.htm?infoid=3489&sid=58, and http://geowebapp.cprm.gov.br/ViewerWEB/index_recmin.html ). Figure 2 Azimuth 125° lineament based on earth’s anomalous magnetic field (AMF) modified from the literature 40 (used with permission of Elsevier, license # 4376530981073). …”
Section: Resultsmentioning
confidence: 99%
“… Azimuth 125° lineament based on earth’s anomalous magnetic field (AMF) modified from the literature 40 (used with permission of Elsevier, license # 4376530981073). …”
Section: Resultsmentioning
confidence: 99%
“…Is there a link between drainage compartmentalization and uplift controlled by intrusive magmatism? The magnetic signature of the Azimuth 125° lineament indicates a set of linear features with regional continuity in the subsurface, characterized by a higher magnetic susceptibility compared with surrounding host rocks 40 . The importance of this lineament as a system of deep crustal discontinuities serving as the main conduit for several alkaline intrusions along the azimuth axis has been confirmed recently 40 .…”
Section: Discussionmentioning
confidence: 99%
“…The magnetic signature of the Azimuth 125° lineament indicates a set of linear features with regional continuity in the subsurface, characterized by a higher magnetic susceptibility compared with surrounding host rocks 40 . The importance of this lineament as a system of deep crustal discontinuities serving as the main conduit for several alkaline intrusions along the azimuth axis has been confirmed recently 40 . The injection of dike-forming magma into the faults of the lineament occurred during two or three tectonic events: (i) between 950 and 520 Ma at two Brasiliano orogeny cycles, older (950–650 Ma) and younger (ca.…”
Section: Discussionmentioning
confidence: 99%
“…The injection of dike-forming magma into the faults of the lineament occurred during two or three tectonic events: (i) between 950 and 520 Ma at two Brasiliano orogeny cycles, older (950–650 Ma) and younger (ca. 700–520 Ma); (ii) at approximately 180 Ma, during the fragmentation of Gondwana; and (iii) at circa 90 Ma 40 . A compilation of the available ages of intrusions along Azimuth 125° indicates periods of intrusions, and consequently, uplifts and large-scale drainage compartmentalization between 91–72.4 Ma (Fig.…”
Interbasin arches between hydrographic systems have a heterogeneous geological origin, forming under the influence of several different geomorphological processes. Independent of the underlying processes, these arches compartmentalize present-day river basins, encompassing different water chemistries, habitat types, soil domains, potential energy and, on a geological/evolutionary time scale, aquatic life varieties in the ecosystem. Through most of its length, the water divide between the Amazonian, Paraná-Paraguay, and São Francisco river basins in central South America coincides with an Upper Cretaceous intracontinental igneous alkaline province. This magmatism, independent of its nature, caused intense crustal uplift and influenced hydrological networks at different scales: from continental-scale crustal doming to continental break-up, and finally to local-scale phenomena. The available ages for alkaline rocks indicate a well-defined time-interval between 72.4 to 91 Ma (concentrated between 76 and 88 Ma) period of uplift that contributed to large-scale drainage compartmentalization in the region. Here we show that uplift associated with intrusive magmatism explains the origin and maintenance of the divide between the Amazonian, Paraná-Paraguay, and São Francisco river basins.
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