History of volcanism and sedimentation synchronous with plutonism during Rhyacian in Serra das Pipocas Greenstone Belt, Borborema Province, NE Brazil

Sousa, Herdivânia Pires de; Parente, Clóvis Vaz; Magini, Christiano; Ximenes, Dillano Rodrigues Bastos; Dantas, Elton Luiz; Caby, Renaud; Júnior, Cecílio Aguiar Rosa

doi:10.1016/j.jsames.2019.102220

Cited by 10 publications

(8 citation statements)

References 37 publications

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“…The Serra das Pipocas greenstone belt comprises meta‐psammitic‐pelitic‐marly rocks with intercalations of komatiitic metabasalts and meta‐acidic rocks, and meta‐exhalites (e.g., tourmalinites, gondites, and metacherts). Sousa et al (2019), analysing the ortho‐derived rocks of this sequence, point to juvenile sources with positive εNd (t) varying between 0.22 and 10.19. The sediment provenance study of Costa, Rodrigues, Cavalcanti, Palheta, and Vasconcelos (2014) indicates major sources 2,200 Ma for the Serra das Pipocas greenstone belt.…”

Section: Geological Settingmentioning

confidence: 85%

“…The Serra das Pipocas greenstone belt comprises meta-psammitic-pelitic-marly rocks with intercalations of komatiitic metabasalts and meta-acidic rocks, and metaexhalites (e.g., tourmalinites, gondites, and metacherts). Sousa et al (2019), analysing the ortho-derived rocks of this sequence, point to juvenile sources with positive εNd (t) varying between 0.22 and 10.19.…”

Section: Geological Settingmentioning

confidence: 90%

“…2,230 Ma) and Serra das Pipocas (ca. 2,234 Ma) greenstone sequences (Figure 1c; Martins et al, 2009;Costa et al, 2018;Sousa et al, 2019). The Serra das Pipocas greenstone belt comprises meta-psammitic-pelitic-marly rocks with intercalations of komatiitic metabasalts and meta-acidic rocks, and metaexhalites (e.g., tourmalinites, gondites, and metacherts).…”

Section: Geological Settingmentioning

confidence: 99%

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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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Section: Geological Settingmentioning

confidence: 85%

Section: Geological Settingmentioning

confidence: 90%

Section: Geological Settingmentioning

confidence: 99%

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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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show abstract

“…Although basaltic rocks are not associated with the drill cores, further south of the present study area, several volcanic mafic bodies with ages ranging from outcrops of 2.2-2.1 Ga mafic bodies in contact with manganese silicate rocks (Martins et al, 2009;Costa et al, 2015;Sousa et al, 2019; Appendix Table 1). The age range of these mafic rocks overlaps with the inferred depositional age of the manganese-bearing rocks in this study.…”

Section: Provenance Detrital Contribution and Post-depositional Featu...mentioning

confidence: 88%

“…Close to the Canindé do Ceará Complex, a 2.1 arc-related mafic outcrop and intermediate volcanic-plutonic rocks, are hosts to Mn-rich silicate rocks (Fetter, 1999;Martins et al, 2009;Costa et al, 2015;Sousa et al, 2019). To the east of the Canindé do Ceará Complex, in the neighboring Jaguaretama Complex, a migmatite paragneiss hosting Mn-rich rocks, and petrographically similar to sample #10029 of the present study, yielded a U-Pb zircon age of 2046 Ma, is interpreted to coincide with the timing of high-grade metamorphic transformation of the sedimentary protolith (Calado et al, 2019).…”

Section: Manganese Mineralization From Northern Borborema Provincementioning

confidence: 99%

Paleoproterozoic manganese oxide precipitation in oxic seawater surface and reductive enrichment in anoxic seafloor

et al. 2022

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Zircon U–Pb geochronology of manganese-rich rocks from the Borborema Province, Northeast Brazil: adding a new piece to the global inventory of Paleoproterozoic manganese mineralization

et al. 2022

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History of volcanism and sedimentation synchronous with plutonism during Rhyacian in Serra das Pipocas Greenstone Belt, Borborema Province, NE Brazil

Cited by 10 publications

References 37 publications

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

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

Paleoproterozoic manganese oxide precipitation in oxic seawater surface and reductive enrichment in anoxic seafloor

Zircon U–Pb geochronology of manganese-rich rocks from the Borborema Province, Northeast Brazil: adding a new piece to the global inventory of Paleoproterozoic manganese mineralization

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