Zircon U-Pb Geochronology of a Manganese-rich Supracrustal Succession in Northeast Brazil: Adding a New Piece to the Paleoproterozoic Manganese Mineralization Puzzle

2021 ◽  
Author(s):  
Felipe Holanda Santos ◽  
Wagner Amaral ◽  
Douglas Martins
Keyword(s):  
Northeast Brazil ◽  
Sedimentary Sequences ◽  
Borborema Province ◽  
Manganese Mineralization ◽  
Minimum Age ◽  
Leucocratic Granite ◽  
Eburnean Orogeny ◽  
Depositional Age ◽  
Other World ◽  
Host Rocks

Abstract A vast accumulation of manganese occurred in the Paleoproterozoic and it is closely related to the Paleoproterozoic Great Oxidation Event. Although the largest Mn deposits are located in the African continent, relevant deposits that potentially correlate with the African ones are found in South America, specifically in the Brazilian territory. The Borborema Province in Northeast Brazil hosts several Mn-rich meta-sedimentary sequences, containing up to 40 wt.% MnO. These sequences are composed of oxidized and manganese silicate lenses that alternate with spessartite-quartzite layers. This succession is hosted by graphite-bearing pelitic gneisses, is metamorphosed to the amphibolite facies, and is intruded by granitic bodies. Although some preliminary studies report Palaeoproterozoic ages for these meta-sedimentary sequences, the age at which the Mn-rich sequences were deposited has not yet been determined. We investigate in this study the Lagoa do Riacho Manganese Deposit, a representative member of the Northern Borborema Province Mn-rich sequences. Not only was the age of the Mn-rich protolith deposition determined by LA-SF-ICP-MS zircon U-Pb geochronology, but also the timing of the metamorphic reworking of the Mn-rich succession was inferred. The youngest detrital zircon population from a meter-sized bed of spessartite-quartzite interlayered with an oxidized manganese ore from drillhole Ocr-1 yielded a maximum depositional age close to 2130 Ma. Similarly, a gneiss hosting the manganese mineralization at the base of drillhole Ocr-1 also yielded a maximum depositional age in the Rhyacian, close to 2156 Ma. We infer from the U-Pb dating of metamorphic overgrowths on zircon from the Mn-bearing sequences and host rocks and the U-Pb crystallization age of an intrusive leucocratic granite that the minimum age of the Mn-rich succession to be 2023-2106 Ma. The metamorphic reworking of the Mn-rich succession is time-equivalent to the Transamazonian/Eburnean orogeny. Thus, these constraints point to a Rhyacian age (ca. 2100-2200 Ma) for the deposition of the Mn-rich protolith, chrono-correlated with other world-class manganese deposits, such as those from the Franceville Basin in Gabon.

Fluid inclusion microthermometry in Be–Ta–(Li–Sn)-bearing pegmatites from the Borborema Province, Northeast Brazil

2001 ◽  
Vol 173 (1-3) ◽  
pp. 107-123 ◽  
Author(s):  
Hartmut Beurlen ◽  
Marcelo R.R. da Silva ◽  
Claudio de Castro
Keyword(s):  
Fluid Inclusion ◽  
Northeast Brazil ◽  
Borborema Province

Statherian-Calymmian (ca. 1.6 Ga) magmatism in the Alto Moxotó Terrane, Borborema Province, northeast Brazil: Implications for within-plate and coeval collisional tectonics in West Gondwana

2019 ◽  
Vol 91 ◽  
pp. 116-130 ◽  
Author(s):  
Geysson Almeida Lages ◽  
Lauro Cézar Montefalco de Lira Santos ◽  
Roberta Galba Brasilino ◽  
Joseneusa Brilhante Rodrigues ◽  
Elton Luiz Dantas
Keyword(s):  
Northeast Brazil ◽  
West Gondwana ◽  
Borborema Province

Deep seismic refraction experiment in northeast Brazil: New constraints for Borborema province evolution

2015 ◽  
Vol 58 ◽  
pp. 335-349 ◽  
Author(s):  
Marcus Vinicius A.G. de Lima ◽  
Jesus Berrocal ◽  
José E.P. Soares ◽  
Reinhardt A. Fuck
Keyword(s):  
Seismic Refraction ◽  
Northeast Brazil ◽  
Borborema Province

scholarly journals A preserved early Ediacaran magmatic arc at the northernmost portion of the Transversal Zone central subprovince of the Borborema Province, Northeastern South America

2016 ◽  
Vol 46 (4) ◽  
pp. 491-508 ◽  
Author(s):  
Benjamim Bley de Brito Neves ◽  
◽  
Edilton José dos Santos ◽  
Reinhardt Adolfo Fuck ◽  
Lauro César Montefalco Lira Santos ◽  
...  
Keyword(s):  
Granitic Rocks ◽  
Lower Plate ◽  
Low Grade ◽  
Northeast Brazil ◽  
The South ◽  
Magmatic Arc ◽  
Continental Plate ◽  
Borborema Province ◽  
Northern Portion ◽  
Fold Belts

ABSTRACT: Magmatic arcs are an essential part of crust-forming events in planet Earth evolution. The aim of this work was to describe an early Ediacaran magmatic arc (ca. 635-580 Ma) exposed in the northernmost portion of the Transversal Zone, central subprovince of Borborema Province, northeast Brazil. Our research took advantage of several syntheses by different authors, including theses and dissertations, carried out on magmatic rocks of the study area for the last 30 years. The ca. 750 km long and up to 140 km wide arc, trending ENE-WSW, is preserved to the south of the Patos Lineament, between 35º15' and 42º30'W and 7º15' and 8ºS. About 90 different stocks and batholiths of I-type granitic rocks were mapped along this orogenic zone, preferentially intruding low-grade schists of the Cryogenian-Ediacaran Piancó-Alto Brígida (SPAB) belt. Three igneous supersuites are recognized: a) epidote-bearing granodiorites and tonalites ("Conceição" type); b) high-K calc-alkaline granites ("Itaporanga" type); c) biotite granodiorites of trondhjemite affinity ("Serrita" type). A fourth group of peralkalic and shoshonitic rocks occurs to the south of the previous ones, reflecting special tectonic conditions. NNE-SSW trending Paleoproterozoic fold belts, surrounding Archean nuclei, characterize the continental part of the northern lower plate. The oceanic fraction of this lower plate was recycled by subduction and scarce remnants of which may be seen either within the enclosing low-grade schists or as xenoliths within the arc intrusions. The upper continental plate presents WSW-ENE structural trends and is composed of Neoproterozoic fold belts and Paleoproterozoic reworked basement inliers. Available data bear clear evidence of an Ediacaran magmatic arc built at the northern portion of the Transversal Zone in the Borborema Province, northeast Brazil.

Northwestern Overthrusting and Related Lateral Escape During the Brasiliano Orogeny North of the Patos Lineament, Borborema Province, Northeast Brazil

1997 ◽  
Vol 39 (7) ◽  
pp. 609-620 ◽  
Author(s):  
Peter Christian Hackspacher ◽  
Elton Luiz Dantas ◽  
Benjamin Bley Brito Neves ◽  
Jean Michel Legrand
Keyword(s):  
Northeast Brazil ◽  
Borborema Province ◽  
Brasiliano Orogeny ◽  
Lateral Escape

Age constraints for Paleoproterozoic glaciation in the Lake Superior Region: detrital zircon and hydrothermal xenotime ages for the Chocolay Group, Marquette Range Supergroup

2006 ◽  
Vol 43 (5) ◽  
pp. 571-591 ◽  
Author(s):  
Daniela A Vallini ◽  
William F Cannon ◽  
Klaus J Schulz
Keyword(s):  
Detrital Zircon ◽  
Sedimentary Cover ◽  
Lake Superior ◽  
The North ◽  
Lake Formation ◽  
Geochronological Study ◽  
Minimum Age ◽  
Depositional Age ◽  
First Time ◽  
Age Constraints

A geochronological study of the Chocolay Group at the base of the Paleoproterozoic Marquette Range Supergroup in Michigan, Lake Superior Region, is attempted for the first time. Age data from detrital zircon grains and hydrothermal xenotime from the basal glaciogenic formation, the Enchantment Lake Formation, and the stratigraphically higher Sturgeon Quartzite and its equivalent, the Sunday Quartzite, provide maximum and minimum age constraints for the Chocolay Group. The youngest detrital zircon population in the Enchantment Lake Formation is 2317 ± 6 Ma; in the Sturgeon Quartzite, it is 2306 ± 9 Ma, and in the Sunday Quartzite, it is 2647 ± 5 Ma. The oldest hydrothermal xenotime age in the Enchantment Lake Formation is 2133 ± 11 Ma; in the Sturgeon Quartzite, it is 2115 ± 5 Ma, and in the Sunday Quartzite, it is 2207 ± 5 Ma. The radiometric age data in this study implies the depositional age of the Chocolay Group is constrained to ~2.3–2.2 Ga, which proves its correlation with part of the Huronian Supergroup in the Lake Huron Region, Ontario, and reveals the unconformity that separates the Chocolay Group from the overlying Menominee Group is up to 325 million years in duration. The source(s) of the ~ 2.3 Ga detrital zircon populations in the Enchantment Lake Formation and Sturgeon Quartzite remains an enigma because no known rock units of this age are known in the Michigan area. It is speculated that once widespread volcano-sedimentary cover sequences in Michigan were removed or concealed prior to Chocolay Group deposition. The hydrothermal xenotime ages probably reflect basinal hydrothermal fluid flow associated with the period of extension, involving rifting and major dyke formation, that affected the North American provinces between 2.2 and 2.1 Ga.

scholarly journals Geochemistry of carbonate formations of the Chhattisgarh Supergroup, central India: implications for Mesoproterozoic global events

2019 ◽  
Vol 56 (3) ◽  
pp. 335-346 ◽  
Author(s):  
Bivin G. George ◽  
Jyotiranjan S. Ray ◽  
Sanjeev Kumar
Keyword(s):  
Central India ◽  
Sedimentary Sequences ◽  
Carbon Burial ◽  
Organic Carbon Burial ◽  
Isotope Stratigraphy ◽  
Global Events ◽  
Archean Greenstone Belt ◽  
Depositional Age ◽  
Carbonate Formations ◽  
Geochemical Studies

The Chhattisgarh Supergroup is one of the major Proterozoic marine sedimentary sequences of India. It consists of largely undeformed and unmetamorphosed siliciclastic, volcaniclastic, and carbonate formations deposited in two sub-basins, Hirri and Bharadwar, separated by an Archean greenstone belt. In spite of its apparent importance for Mesoproterozoic oceanic records, very few geochemical studies have been carried in the basin. Here, we present results of our high resolution geochemical and C–O–Sr isotopic studies in two carbonate formations of the supergroup: the Charmuria and the Chandi. We observe elevated δ13C values increasing from 2.6‰ to 3.6‰ in these formations, which is consistent with the globally reported late Mesoproterozoic values. Such consistently positive δ13C values are attributed to increased organic carbon burial in the basin margins during the deposition of these carbonates. Based on the principles of δ13C isotope stratigraphy, we suggest a depositional age between 1.0 and 1.2 Ga for these carbonates which form the upper part of the supergroup. The lowest 87Sr/86Sr ratios obtained from the Charmuria and Chandi formations, 0.70723 and 0.70816, respectively, are more radiogenic than the contemporaneous seawater, suggesting that the Sr isotopic system of the formations are altered. Based on the similarity in the δ13C values, we stratigraphically correlate the carbonate formations of the Raipur Group in both the Hirri and Bharadwar sub-basins. We also present a compilation of available δ13C and 87Sr/86Sr records from all the Proterozoic sedimentary successions of India and compare it with the global datasets. We find that while the Indian basins possess records of the Bitter Springs and Shuram δ13C anomalies, they lack evidence for the other major global events of the Proterozoic.

Diorites of the High-K Calc-Alkalic Association: Geochemistry and Sm-Nd Data and Implications for the Evolution of the Borborema Province, Northeast Brazil

2001 ◽  
Vol 43 (10) ◽  
pp. 921-929 ◽  
Author(s):  
Gorki Mariano ◽  
Sergio Pacheco Neves ◽  
Adejardo Francisco Da Siva Filho ◽  
Ignez De Plnho Guimaraes
Keyword(s):  
Northeast Brazil ◽  
High K ◽  
Borborema Province
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