Fragments of 1.79-1.75 Ga Large Igneous Provinces in reconstructing Columbia (Nuna): a Statherian supercontinent-superplume coupling?

Chaves, Alexandre de Oliveira; Rezende, Christopher Rocha de

doi:10.18814/epiiugs/2019/019006

Cited by 27 publications

(9 citation statements)

References 50 publications

(111 reference statements)

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“…The geophysical maps used (Figures 3B and 3C) correspond to areas 5 and 18 produced by the Aerogeophysical Survey of the State of Minas Gerais, carried out by CODEMIG (2008CODEMIG ( /2009CODEMIG ( and 2010CODEMIG ( /2011, with a flight height of 100 meters and spacing of 500 meters. The positioning of the amplitudes resulting from the analytical signal (Figure 3B) reveals lineaments of high magnetic intensity related to mafic dykes (diabases) of NW-SE direction referring to the 1.76 Ga Januária swarm (Chaves & Correia Neves, 2005;Chaves & Rezende, 2019;Chaves et al 2021). The association of the Th-U-K ternary gammaspectrometric map with the shaded relief (Figure 3C) allows defining areas of high potassium mainly associated with drainages.…”

Section: Geological Settingmentioning

confidence: 97%

GEOCHEMISTRY AND U-Pb GEOCHRONOLOGY OF THE NEOARCHEAN GNEISSES AND PALEOPROTEROZOIC GRANITES FROM JANUÁRIA HIGH: RECORDS OF JUVENILE AND YOUTHFUL EARTH IN THE SÃO FRANCISCO CRATON NUCLEUS (BRAZIL)

CHAVES,

REZENDE,

SILVA

et al. 2023

Geociencias

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Within the proposal of secular evolution of the Earth system divided into seven phases: “Proto-Earth” (4.57–4.45 Ga); “Primordial Earth” (4.45–3.80 Ga); “Primitive Earth” (3.8–3.2 Ga); “Juvenile Earth” (3.2–2.5 Ga); “Youthful Earth” (2.5–1.8 Ga); “Middle Earth” (1.8–0.8 Ga); and “Contemporary Earth” (since 0.8 Ga), the 2.61-2.64 Ga High-K, meta- to peraluminous Januária High orthogneisses are inserted in the context of almost rigid behavior of the lithosphere, by the end of the Juvenile Earth. With protolith origin suggestive of intracrustal partial melting of local older TTG (tonalite-trondhjemite-granodiorite), these orthogneisses are the representatives in the São Francisco craton nucleus of the 2.8 Ga to 2.6 Ga potassic rocks found in archean cratons worldwide, and the occurrence of these rocks is a defining characteristic of the Juvenile Earth. Supported on evidence of the plate tectonic activity in Paleoproterozoic, the 2.14-2.19 Ga Januária High biotite granites are inserted in the context of Youthful Earth and they are the record of accretionary orogeny delineated by the edification of magmatic arc at that time. They are calc-alkaline, I-type rocks typical of subduction-related continental magmatic arcs. These biotite granites are probably derived from a High-K mafic source associated with tonalites.

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Section: Geological Settingmentioning

confidence: 97%

GEOCHEMISTRY AND U-Pb GEOCHRONOLOGY OF THE NEOARCHEAN GNEISSES AND PALEOPROTEROZOIC GRANITES FROM JANUÁRIA HIGH: RECORDS OF JUVENILE AND YOUTHFUL EARTH IN THE SÃO FRANCISCO CRATON NUCLEUS (BRAZIL)

CHAVES,

REZENDE,

SILVA

et al. 2023

Geociencias

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“…Based on the distribution of fragments of LIP of distinct ages, Chaves and Rezende (2019) have proposed a new reconstruction of Columbia (Nuna) supercontinent. This reconstruction is shown in Figure 10, where purple and green circles represent the thermal impact area promoted by 1.52 Ga and 1.38 Ga mantle plume activity, recorded by volcanic mafic dykes and sills (LIP fragments).…”

Section: Intraplate Tectono-magmatic Phenomena and Paleogeographic Implicationsmentioning

confidence: 99%

“…Figure10. Columbia (Nuna) supercontinent reconstructed afterChaves and Rezende (2019). Purple and green circles represent the thermal impact area promoted by 1.52 Ga and 1.38 Ga mantle plume activity, recorded by their associated LIP fragments (volcanic, mafic dykes and sills).…”

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confidence: 99%

Geochronology of monazite related to REE, Nb–Ta and U–Th bearing minerals from Mesoproterozoic anorogenic magmatism in the E-Colombian Amazonian Craton: Links to mantle plume activity in the Columbia (Nuna) supercontinent

Victoria

Cramer

Chaves

et al. 2021

Journal of South American Earth Sciences

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U-Th-Pb geochronology of REE-bearing minerals such as monazite and other phosphates has become a precise tool to date mineralization events through geological time. In the E-Colombian Guainía department, from 3 colluvial sites over western Guiana Shield Mesoproterozoic rocks Nb-Ta, U-Th and REE bearing minerals probably of pegmatitic origin were sampled including up-to-0.5 cm long monazite crystals. The monazite pan concentrate samples from sites near to the indigenous communities of Barranquilla, San Jose and Chorro Bocón (Espina hills) along the Cuyari, Guainía, and Inírida rivers respectively, were analyzed geochemically and geochronologically using LA-ICP-MS and EPMA. The monazites obtained from the 3 sites are rather similar among each another and of approximate composition Ce0.44La0.16Nd0.16Sm004Y0.03Gd0.02Dy0.01Pr0.05Th0.08Pb0.01Ca0.05Si0.05P0.91O3.94.Their EPMA and LA-ICP-MS ages suggest at least two mineralization events, a first one between 1528 and 1523 Ma in the Barranquilla and San Jose sites, related to rapakivi granites outcropping along the Cuyarí River and the Tabaquen rapakivi granite near the Guainía River, both emplaced ~1545 Ma ago. The second mineralization event from 1390-1343 Ma recorded in the Espina-hills is in the age range of the Matraca and Danta rapakivi granites that crystalized between 1400 and 1340 Ma ago. These different anorogenic rapakivi granites were emplaced between 1550 and 1300 Ma into Mesoproterozoic basement rocks and were probably caused by intra-plate processes associated with mantle plume activity within the Columbia (Nuna) supercontinent.

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“…In Brazil, Palaeoproterozoic khondalite sequences occur in the São Francisco Craton (e.g., Itapecerica Supracrustal Sequence, Brejões Dome, and Tanque Novo‐Ipirá Complex), in the Borborema Province (e.g., Granja, Canindé do Ceará, and Jaguaretama complexes), and in the Brasília Belt (Ticunzal Formation) (Figure 1a,b) (Calado, Costa, Gomes, & Rodrigues, 2019; Cuadros, Botelho, Fuck, & Dantas, 2017; Fragomeni & Pereira, 2013; Miranda, Chaves, Dussin, & Porcher, 2020). The khondalitic rocks of the São Francisco Craton mark the locus of a segment of the Columbia Supercontinent Suture and palaeomagnetic reconstructions indicates its continuity in the North China Craton (Chaves, 2021; Chaves & Rezende, 2019; Miranda et al, 2020; Teixeira et al, 2017). In the Brasília Belt, the Ticunzal Fomation was deposited in a continental arc‐related basin between 2.16 and 2.19 Ga (Cuadros et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Rhyacian‐Orosirian Khondalite Belt in the Borborema Province (NE Brazil): An active margin setting based on U–Pb zircon and monazite constraints

Muniz¹,

Santos²,

Dantas

et al. 2022

Geological Journal

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Khondalite belts are of special importance is delimiting old suture zones and in palaeocontinental reconstruction of Precambrian terrains. In the South‐American Platform, khondalitic rocks surround cratonic areas and Archean blocks reworked in the Neoproterozoic, an example of which being the Ceará Khondalite Belt (CKB). Located in the northern portion of the Borborema Province in NE Brazil, CKB is here described by means of its petrographic, structural, and LA‐SF‐ICP‐MS zircon and monazite U–Pb geochronological characteristics. CKB constitutes an E‐W to NE–SW striking belt comprising migmatitic spinel (hercynite)‐ and graphite‐bearing cordierite‐garnet‐sillimanite‐biotite gneisses, small granulitic boudins, garnet‐biotite quartzite, lenses of garnet amphibolite, calc‐silicate rock, gondite, and mylonitized leucogneiss. Relicts of Palaeoproterozoic island and continental arcs surrounding CKB are represented by tonalitic and dioritic gneiss, respectively. The contact between CKB and the Neoproterozoic Independência Unit is marked by a transpressional shear zone to the north, whereas the contact between CKB and Archean and Palaeoproterozoic rocks to the south is via a N‐verging thrust fault. The metamorphic peak is given by the parageneses: spinel (hercynite)‐quartz, spinel (hercynite)‐cordierite, and cordierite‐sillimanite‐garnet, possibly stable under UHT conditions. Crystallization ages of 2,086 ± 8 Ma and 2,063 ± 9 Ma were obtained by dating CKB migmatitic dioritic orthogneisses using the zircon U–Pb method. The CKB para‐derived rocks yielded detrital zircon U–Pb age peaks at 2,190, 2,130, and 2,060 Ma. Three metamorphic stages are identified in the Palaeoproterozoic via U–Pb dating of zircon rims and monazite at 2,094 ± 4 Ma, 2,055 ± 5 Ma, and 1,958 ± 3 Ma. A fourth metamorphic event with associated migmatization in shear zones took place in the Neoproterozoic between 595 ± 6 Ma and 573 ± 15 Ma, as indicated by dating zircon rims and monazite, respectively. Our study shows that the metamorphic events occurring in CKB in the Palaeoproterozoic share similarities with those that affected the khondalitic rocks bordering the São Francisco and the North China cratons, which suggests the existence of a continuous orogen during the Rhyacian‐Orosirian related to the Columbia Supercontinent amalgamation.

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Fragments of 1.79-1.75 Ga Large Igneous Provinces in reconstructing Columbia (Nuna): a Statherian supercontinent-superplume coupling?

Cited by 27 publications

References 50 publications

GEOCHEMISTRY AND U-Pb GEOCHRONOLOGY OF THE NEOARCHEAN GNEISSES AND PALEOPROTEROZOIC GRANITES FROM JANUÁRIA HIGH: RECORDS OF JUVENILE AND YOUTHFUL EARTH IN THE SÃO FRANCISCO CRATON NUCLEUS (BRAZIL)

GEOCHEMISTRY AND U-Pb GEOCHRONOLOGY OF THE NEOARCHEAN GNEISSES AND PALEOPROTEROZOIC GRANITES FROM JANUÁRIA HIGH: RECORDS OF JUVENILE AND YOUTHFUL EARTH IN THE SÃO FRANCISCO CRATON NUCLEUS (BRAZIL)

Geochronology of monazite related to REE, Nb–Ta and U–Th bearing minerals from Mesoproterozoic anorogenic magmatism in the E-Colombian Amazonian Craton: Links to mantle plume activity in the Columbia (Nuna) supercontinent

Rhyacian‐Orosirian Khondalite Belt in the Borborema Province (NE Brazil): An active margin setting based on U–Pb zircon and monazite constraints

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