Deposits In Brazil Research Articles

Taphonomic histories of Quaternary fossil accumulations preserved in Brazilian cave deposits

The taphonomic histories of five cave deposits in Brazil were interpreted, focusing on the accumulation and taphonomic modes. These caves, Complexo Suíço, F3, Toca das Onças, Lapa dos Peixes and Gruna das Três Cobras, show evidence of remains being accumulated through entrapping, sheltering, and water transportation. Cluster Analysis revealed a predominance of irregular breaks and low stages of weathering as the primary taphonomic mode, along with lack of corrosion and abrasion. Factor Analysis also indicated that incrustation played a major role in distinguishing between the deposits. The remains in F3, Toca das Onças, Lapa dos Peixes, and Gruna das Três Cobras caves experienced similar preservation conditions, including fragmentation from reworking, block collapses, exposure to acidified rainwater, incrustation and abrasion from water-borne sediments, and corrosion due to bat guano and acidified water.

Vertebrate fossil diagenesis of the Leon Ravine accumulation (Lajedo de Soledade, Apodi, Rio Grande do Norte): insights on the fossilization from Quaternary deposits in Brazil

Vertebrate fossil diagenesis of the Leon Ravine accumulation (Lajedo de Soledade, Apodi, Rio Grande do Norte): insights on the fossilization from Quaternary deposits in Brazil

GEOLOGICAL FACTORS OF SHALE FORMATIONS IN UKRAINE

Oil shale is quite widespread in the world. They are represented by both small oil shale occurrences and large deposits. At present, only a few oil shale deposits in Brazil, China and Estonia are being exploited. Given the decline in global oil production, oil shale is a promising source of energy in the future. Oil shale contains hydrocarbon reserves that are significantly higher than those of natural oil and gas. According to exploration data, the resources of oil shale deposits in the world are enormous. Their potential resources are estimated at 650 trillion tonnes, while known resources reach 450 trillion tonnes. It is difficult to make a general assessment of global resources, as different countries use different methods to study them, taking into account the availability of reserves, the need, and the feasibility of their extraction and use. When addressing environmental issues, it is necessary to take into account the fact that gas emissions and wastewater from oil shale processing facilities contain pollutants that have an increased environmental impact and harmful effects on the human body.

AKILLI MALZEMELER VE İLERİ BİYOMEDİKAL UYGULAMALARI: HNT VE HNT-POLİMER KOMPOZİTLERİ

The aluminosilicate clay minerals (Al2Si2O5(OH)4·nH2O) known to exist in nature are called halloysite nanotubes (HNTs). HNTs, which are found in layered, spherical, flat and other forms, can be obtained naturally as well as synthetically. HNTs with an outer diameter of 50 nm and a length ranging from 500 to 1000 nm have a hollow and nanotube-shaped structure. It has natural deposits in Brazil, Turkey, New Zealand, China, the United States, Korea, Japan, and France, and it is a low-cost material that can be obtained through ore purification. Thanks to their high surface area, large pore volume, rheological properties, high interactions, and high binding capacities with biopolymers, HNTs are used in a wide range of areas. For example, HNTs have become a frequently used material in environmental applications such as wastewater treatment and removal of organic contaminants and dyes. It is also used in the production of nanoelectronics and nanocomposites, catalytic studies, flame retardants in make-up materials, forensic sciences and biomedical fields. The specific properties of HNT used in the biomedical field lead to numerous applications. In this review, it is aimed to present the advantages of HNTs for use in drug delivery systems, immune therapy, anti-infection applications, cancer therapy, bioimaging, biosensing applications, tissue engineering applications, implants and hygiene-cosmetics materials.

A modified paleoplacer model for the metaconglomerate-hosted gold deposits at Jacobina, Brazil

Evidence is presented that the metaconglomerate-hosted Jacobina gold deposits in Brazil represent paleoplacers that became partly remobilized during later metamorphic overprint analogous to Witwatersrand-type deposits elsewhere, notably in South Africa. This includes strong lithological and sedimentological control on the gold, presence of detrital minerals with gold inclusions, and detrital gold particles. Detrital, synsedimentary, and post-depositional pyrite types can be differentiated. Whereas the first two types can be linked to gold accumulation, the latter was associated with gold dispersion. Synsedimentary pyrite has the highest Au content, from which elevated Au concentrations in Archean rivers can be inferred. The nature and extent of post-depositional alteration, mainly in the course of the Paleoproterozoic Orogeny, distinguishes the Jacobina deposits from other Witwatersrand-type gold deposits. Phase equilibria and Zr-in-rutile thermometry indicate peak metamorphic temperatures of ca. 600 °C. Both Mg-chlorite and Fe-chlorite formed in disequilibrium at approximately 280–340 °C during retrograde metamorphism. An igneous signature in the chemistry of some of the tourmaline and the remobilization of gold associated with Fe-oxides, near intrusive rocks, point at a local magmatic influence on the post-depositional mineralization stage. Whether magmatic hydrothermal fluids added Au to the system at that stage remains to be determined. Remobilization during regional metamorphism was insufficient to form substantial ore bodies but led to purification of the initially detrital gold particles that now contain relatively little Ag and Cu and lack Hg.

Investigation into Brazilian Palygorskite for Its Potential Use as Pharmaceutical Excipient: Perspectives and Applications.

Palygorskite is an aluminum and magnesium silicate characterized by its fibrous morphology, providing it with great versatility in industrial applications, including pharmaceuticals. Although most of the reserves are in the United States, in recent years occurrences of commercially exploited deposits in Brazil have been recorded, mainly in the country's northeast region. This has motivated this study, which analyzes raw Brazilian palygorskite compared to a commercial sample (Pharmasorb® colloidal) to demonstrate its pharmaceutical potential. The chemical and mineral composition of the samples were evaluated for surface properties, granulometry, morphology, crystallography, thermal analysis, and spectroscopy. Raw palygorskite presented 67% purity, against 74% for Pharmasorb® colloidal. The percentage purity relates to the presence of contaminants, mainly carbonates and quartz (harmless under conventional conditions of pharmaceutical use). Furthermore, it was possible to confirm the chemical composition of these phyllosilicates, formed primarily of silicon, aluminum, and magnesium oxides. The crystallographic and spectroscopic profiles were consistent in both samples, showing characteristic peaks for palygorskite (2θ = 8.3°) and bands attributed to fibrous phyllosilicates below 1200 cm-1, respectively. The thermal analysis allowed the identification of the main events of palygorskite, with slight differences between the evaluated samples: loss of water adsorbed onto the surface (~85 °C), removal of water contained in the channels (~200 °C), coordinated water loss (~475 °C), and, finally, the dehydroxylation (>620 °C). The physicochemical characteristics of raw palygorskite align with pharmacopeial specifications, exhibiting a high specific surface area (122 m2/g), moderately negative charge (-13.1 mV), and compliance with the required limits for heavy metals and arsenic. These favorable technical attributes indicate promising prospects for its use as a pharmaceutical ingredient in the production of medicines and cosmetics.

PEG2009 PRE-SYMPOSIUM FIELD TRIP GUIDE: EASTERN BRAZILIAN PEGMATITE PROVINCE (MINAS GERAIS)

Pegmatite gemstones became officially known in the Brazil history since the last decades of the 17th century, when green tourmalines were found in the central-northeastern Minas Gerais region by Fernão Dias Paes Leme, one of the most famous leaders of Brazilian colonizers. Later, pioneer naturalists and geologists of the 19th century first decades, such as von Eschwege, von Spix & von Martius and Saint-Hilaire, referred to pegmatite gem deposits and/or trading of coloured gems in regions of the Araçuaí, Jequitinhonha, Doce and Mucuri river valleys. However, only in the 20th century, particularly during and after the Second World War, pegmatites became important mineral deposits in Brazil owing to efforts to increase the production of mica, beryl and quartz for the USA military industry. This mining development was accompanied by pioneer geologic studies and several new mineral specimens were discovered. Accordingly, the Brazilian pegmatite populations were grouped into the Eastern, Northern and Southern Brazilian pegmatite provinces. These provinces were defined mainly based on the geographical distribution of pegmatites, because at that time Brazil lacked geological maps even for a regional approach. This guide was elaborated for a pre-symposium field trip held before 2009 PEG - 4th International Symposium on Granitic Pegmatites, and focused on different aspects of pegmatites located in three important districts of the Eastern Brazilian Pegmatite Province (EBPP), namely São José da Safira, Conselheiro Pena and Araçuaí pegmatite districts. The field trip included from primitive garimpos for mineral exploitation to a very organized mine, showing pegmatites with different mineral (beryl, phosphate, spodumene or tourmaline) specializations that are related to distinct geologic settings and genetic conditions. A visit to a quarry for dimension stone on a pegmatite body was also scheduled. This guide also presents a synthesis on the geologic setting of the main EBPP pegmatite districts and their main features, followed by brief descriptions of the field trip stops. Those were the Ipê Pegmatite in Governador Valadares town, Sapucaia Pegmatite in the town of Galileia, Boa Vista and Cigana Pegmatites in the town of Conselheiro Pena, K2 Ornamental Pegmatite Quarry in Itinga town, CBL Spodumene Mine in Araçuaí town, Água Santa Mine and a pegmatite swarm which occurs along a road cut of the BR-342, both located in the town of Coronel Murta.

Au-Pd mineralization and ore-forming fluids of the Bleïda Far West deposit (Anti-Atlas, Morocco)

Research subject. Au-Pd mineralization of the Bleïda Far West deposit, represented by an unusual association of palladium gold, minerals of the Pd-Bi-Se system, as well as silvery gold and minerals of the Pd-Bi-Te system. The deposit is localized in the Neoproterozoic volcanic rocks of the central Anti-Atlas (Morocco).Methods. A chemical analysis of minerals was carried out at the Center for Collective Use of Multielement and Isotopic Studies of the Siberian Branch of the Russian Academy of Sciences (Novosibirsk, Russia) using the electron probe microanalysis (EPMA) method. Fluid inclusions were studied using cryometry and homogenization using a THMSG-600 microthermochamber. The composition of the gas phase and the determination of the solid phases of the inclusions were carried out by Raman spectroscopy. The qualitative chemical composition of fluid inclusion salts was determined by the EPMA method.Results and conclusions. It is suggested that palladium gold and minerals of the Pd-Bi-Se system were formed under the conditions close to those during the formation of Au-Pd infiltration deposits in Brazil, while silvery gold and minerals of the Pd-Bi-Te system could be formed under the conditions similar, but not identical, to the formation conditions of Au-Pd low-temperature mineralization in porphyry deposits. According to the study of fluid inclusions in quartz and calcite, Au-Pd mineralization was formed at temperatures from 384 to 75°C with the participation of homogeneous or heterophasic CaCl2-NaCl highly saline hydrothermal solutions at a depth of 2.8–2.7 km. Minerals of the Pd-Bi-Se system, previously unknown in Bleïda Far West ores, were found in association with native gold: osterboshite (Pd, Cu)7Se5, paladsite (Pd17Se15), (Au,Ag)Se, padmaite PdBiSe, native Se, as well as a number of unidentified phases – Pd2BiSe, Pd3BiSe, Pd4BiSe and Pd5BiSe.

Spinal fracture reveals an accident episode in Eremotherium laurillardi shedding light on the formation of a fossil assemblage

The Toca das Onças cave is one of the most important Quaternary mammal deposits of Brazil. Two different hypotheses have been proposed to explain the preservation mode of its skeletal remains: either the animals climbed down into the cave, or it could have functioned as a natural trap. Evaluation of pathological modifications on three articulated vertebrae of a single adult giant ground sloth Eremotherium laurillardi reveals a particular type of bone fracture caused by compressive force on the vertebral column, which split the vertebral bodies in the sagittal plane. This diagnosis suggests that the animal accidentally fell into the cave, in accordance with the second hypothesis proposed to the incorporation mode of skeletal remains into the cave.

PHOSPHATE-SULFATE PEBBLES FROM THE ALUNITE SUPERGROUP MINERALS IN THE PAININN DIAMOND ALLUVIONS ON THE MARGINS OF THE TAPAJÓS IN ITAITUBA (PARÁ): GOYAZITE-FLORENCITE-GORCEIXITE-CRANDALLITE-SVANBERGITE/WOODHOUSEITE

The diamond alluvium gravels from the Painin garimpos, on the right bank of the Tapajós River, in Itaituba, Pará, stand out for the marked presence of pebbles from <1 cm to about 10 cm in diameter consisting of aluminum phosphate-sulfates (APS minerals) from the alunite supergroup: goyazite-florencite-gorceixite-crandallite-esvanbergite/woodhouseite. They are light gray pebbles, still containing small amounts of pyrite, kaolinite, goethite and anatase. The total chemical and trace element analyzes confirm the indicated mineralogical constitution alongside the XRD. The florencite member is mainly dominated by Ce, La, Nd and Sm, the light rare earth elements, and also contains anomalous concentrations of Nb, Y, Pb, U and Th. This chemical nature of these pebbles, in part, makes it possible to compare them with the diamond satellite beans (favas) in secondary deposits in Brazil, but chemically only with the phosphates from Malawi and Sayan.

Influence of 2019-nCoV in the increment of external gamma exposure in a uranium deposit area in Brazil

ABSTRACT The new coronavirus pandemic (2019-nCoV) arrived in Brazil in February 2020, where the worsening led to social isolation. The population started to remain entirely in their homes, mainly the elderly, children, and adolescents. The study aimed to determine the impact of radioecological dosimetry within the residences located in the municipality from Espinharas, Paraíba, Brazil, where one of the main uranium deposits in Brazil occurs. A scintillator-type gamma spectrometer with a combined NaI (Tl) and BGO probe, at 1.0 m from the soil surface, was used. A total occupation factor for the pandemic period was considered. The dose-response for the three months ranged from 0.55 to 1.70 mSv, with an average of 0.68 mSv, which characterises an increase of 25% when compared to the same period of the retrospective study in 2014. In the period of one year, the dosimetric response can vary between 2.22 and 6.80 mSv/y, with an average of 2.73 mSv/y. The work portrays the importance of a database for future affirmative actions and the determination of different radiometric conditions in an environment already considered to have a high level of natural radioactivity. The study also provides definitions of extreme exposure conditions and correlations with public health parameters.

The Miguel Burnier district: An encapsulation of Brazil's mining history

The Miguel Burnier mining district has been part of Brazil’s mining history since its early developments in Portuguese colonial times. All the great cycles in Brazilian mining history were first witnessed in this mining district of Ouro Preto and its close vicinity within the Quadrilátero Ferrífero in the state of Minas Gerais. The district was founded during the Brazilian gold rush, the longest in the world’s history, which lasted from the late seventeenth to the early nineteenth century and which had a dramatic impact on the economy and history of Brazil, Europe and Africa. Attracted by the mineral wealth of Minas Gerais, several nineteenth-century naturalists visited Miguel Burnier. They were responsible for important observations and studies in the district, including the discovery of large manganese deposits. At the dawn of the twentieth century, a manganese rush began, and the manganese mines of Miguel Burnier came to be known worldwide for their high-grade ores, especially those mined by Usina Wigg, a company that operated in the district from the 1890s to 1996. This company, a pioneer of the Brazilian steel industry, had its apogee in World War I when Brazil became the main manganese supplier to the US market. Manganese mining in Miguel Burnier also contributed to the development of geology and its application to ore deposits in Brazil, leading to studies of the world-class iron ore deposits of the Quadrilátero Ferrífero and to iron ore becoming Brazil’s main mineral commodity since the 1940s.

An analysis of geochemical features of crystallization of emeralds as an approach to determine the deposit of them

Relevance. It is known that minerals differ in morphology, features of the internal structure of crystals, chemical composition, etc., depending on the conditions of their formation and existence. These geochemical features of the gems crystallization are an important criterion for determining their deposit. In this paper, the impurity composition of the samples of emeralds from the deposits of Brazil, China, Zambia, Russia, Afghanistan, Colombia, and Tanzania was investigated by X-ray fluorescent analysis. The study of the impurity composition of emeralds by a non-destructive method and the construction of analytical dependences can be used as an additional way for determining the deposit of emeralds. Purpose of the work is the study of chemical composition of emeralds by X-ray fluorescent analysis to establish the relationship between the content of the main impurity elements and the deposit. Results. The data on the impurity composition of emeralds obtained by X-ray fluorescent analysis show that the content of impurities of Na, K, Rb, Cs, Mg, Fe, V, Cr differs from one deposit to another. The content of impurities of alkali metals and magnesium is higher in the samples from the shale-type deposits compared to the samples from deposits of the Colombian type. Thus, at the first stage, the type of deposit can be assumed. Further, the dependences plotted in the coordinate planes {Cr, V}, {Cs, Cr}, {Fe, Cr} show separate areas, delimited by the impurity ratios, which are typical for the samples from deposits in China, Colombia, Zambia, Afghanistan, and Tanzania. Conclusion. X-ray fluorescent analysis, as a non-destructive method for studying emeralds, is considered to be a promising approach to identifying their deposit, but as an additional method.

Gold deposits ot the Guiana shield

The article provides a comparative analysis of Guyana and Venezuela major deposits within the Quartzstone ore field (Guyana). From the northwest to the southeast (from Venezuela to Brazil), more than 10 ore gold deposits are currently known, their total resources (including previous production) exceed 2,600 tons of gold (excluding the Amapari and Salamangoni deposits in Brazil). Almost all of Guyana deposits are confined to the Lower Proterozoic greenstone belts of the Guiana shield identified and explored for the past 15–20 years. The geological features of the largest deposits (Omay, Aurora, Toroparu, Tassawini and Monosi) are presented in the article.

Comminution and liberation response of iron ore types in a low-grade deposit

Low-grade iron ore deposits in Brazil are typically represented by rocks called itabirites. These deposits contain ores with different characteristics, which present varying degrees of weathering, with direct implications in iron contents, liberation characteristics and comminution response. This work analyzes the five main ore types or lithologies contained in the Serra do Sapo deposit, as part of the Minas-Rio mining complex (near the city of Conceição do Mato Dentro, Brazil). Besides detailed chemical and mineralogical composition, liberation characteristics of the ore types have been analyzed by scanning electron microscopy and QEMSCAN. Samples were also subjected to point-load and abrasiveness tests as well as batch grinding tests. It is evident that at coarse sizes the ore types present significantly different strengths and abrasiveness, with values decreasing, as expected, with increasing degree of weathering. However, such differences partially disappeared as comminution progressed to finer sizes. Amenability of the different ores to slimes generation also varied, with weathered ores presenting significantly higher values. Grade by size deportment results show that selected ore types offer opportunity for early gangue (silica) rejection prior to the grinding stage.

Process mineralogy of rare earths from deeply weathered alkali-carbonatite deposits in Brazil

Brazil has the second largest rare earths mineral (REM) resource in the world, mainly associated with the weathered portion of carbonatite complexes. This paper reports process mineralogy studies performed for 10 samples collected from the deeply weathered portion of different relevant Brazilian deposits, having a soil appearance and varied grain sizes with a significant content of natural fines (below 20μm). The results indicate that REM are mainly composed of light rare earth elements and present a fine-grained nature and intricate associations with gangue minerals. Monazite is by far the most relevant REM; cerianite and bastnaesite are typical of only one of the studied deposits. The complexity of the occurrence of the rare earths challenges the development of mineral processing routes. A scandium phosphate mineral identified as a trace in one of the studied deposits has not yet been reported in the Brazilian alkaline complexes.

Comparative Analysis of Palygorskite Samples From Different Occurrences in Guadalupe (Piauí, Brazil)

Palygorskite is a clay mineral that has several industrial and environmental applications. Palygorskite main deposits in Brazil are located in the municipality of Guadalupe, Piauí. A comparative study was performed with five samples of palygorskite from different locations through ore dressing and chemical and mineralogical characterization, using the XRD, XRF and methylene blue titration techniques. According to the results, there are significant differences in the samples composition. Among them, the most significant difference was the cation exchange capacity (CEC) value, which ranged from 24.0 to 41.0 meq.100 g-1, followed by the content of some oxides and the crystalline phases present. Despite coming from the same region, the samples contained distinct impurities.

Biogeochemical cycling of iron: Implications for biocementation and slope stabilisation

Microbial biofilms growing in iron-rich seeps surrounding Lake Violão, Carajás, Brazil serve as a superb natural system to study the role of iron cycling in producing secondary iron cements. These seeps flow across iron duricrusts (referred to as canga in Brazil) into hydraulically restricted lakes in northern Brazil. Canga caps all of the iron ore deposits in Brazil, protecting them from being destroyed by erosion in this active weathering environment. Biofilm samples collected from these seeps demonstrated heightened biogeochemical iron cycling, contributing to the relatively rapid, seasonal formation of iron-rich cements. The seeps support iron-oxidising lineages including Sideroxydans, Gallionella, and an Azoarcus species revealed by 16S rRNA gene sequencing. In contrast, a low relative abundance of putative iron reducers; for example, Geobacter species (<5% of total sequences in any sample), corresponds to carbon limitation in this canga-associated ecosystem. This carbon limitation is likely to restrict anoxic niches to within biofilms. Examination of a canga rock sample collected from the edge of Lake Violão revealed an array of well- to poorly-preserved microbial fossils in secondary iron cements. These heterogeneous cements preserved bacterial cell envelopes and possibly extracellular polymeric substances within the microfossil iron-rich cements (termed biocements). Bacterial iron reduction initiates the sequence, and intuitively is the rate-limiting step in this broadly aerobic environment. The organic framework of the active- and paleo-biofilms appears to provide a scaffold for the formation of some cements within canga and likely expedites cement formation. The accelerated development of these resilient iron-rich biocements in the lake edge environment compared with surroundings duricrust-associated environments may provide insights into new approaches to remediate mined land, aiding to stabilise slopes, reduce erosion, restore functional hydrogeology and provide a substrate akin to natural canga for revegetation using endemic canga plant species, which have adapted to grow on iron-rich substrates.

Influence of Energy Factor on International Relations System of Latin America in the 21st century

Relation between oil trade and political regimes, climate change and problems of managing natural resources, mining technologies and fighting corruption and many others constitute the phenomenon of a multicomponent energy policy, the study of which is located at the intersection of natural and social sciences. Latin American region has large hydrocarbon reserves, huge hydropower potential, as well as significant opportunities to generate wind and solar energy. Historically, Latin America has occupied a small share of world energy production - about 5 %, where Venezuela, Mexico and Brazil have long been the only players of a global level. However, in the 21st century, factors such as the discovery of pre-salt oil deposits in Brazil, promising forecasts for the development of alternative gas sources in Argentina and the opening of Mexican oil industry for foreign companies after more than seventy years of the monopoly of Pemex, gave an additional impetus to the development of oil and gas industries of the region. The close relationship between energy industry and political context of a number of Latin American countries makes the region’s energy market less predictable, as changes cannot be predicted using standard industry analysis tools. This article analyzes the most significant episodes of political intervention - external or internal - to the energy industry in the 21st century, as well as the impact that events and decisions in this industry had on the regional policy. The authors analyze distinctive examples of the interconnectedness of these areas, from the “resource diplomacy” of Venezuela to the decisive actions of A.M. Lopez Obrador in Mexican energy in the first months of his presidency, and draw parallels between the chains of events in politics and energy. As the cases of Brazil, Mexico, Bolivia, and Venezuela, cited in the article, show, the cost of error becomes extremely high when its consequences can destabilize both sectors due to their close interweaving.

Geology, petrography and mineral chemistry of iron oxide-apatite occurrences (IOA type), western sector of the neoproterozoic Santa Quiteria magmatic arc, Ceará northeast, Brazil

Iron oxide-apatite (IOA) occurrences have recently been identified in the western sector of the Neoproterozoic Santa Quitéria magmatic arc (Ceará state, northeast Brazil), close to the boundary with the Paleozoic Parnaíba Basin. The IOA mineralization is hosted by albitized metadiorites and metavolcano-sedimentary rocks, which are crosscut by a late- to post-Brasiliano/Pan-African biotite granite intrusion with a U-Pb age approximately 548 ± 4 Ma. Within the metavolcano-sedimentary sequence, metavolcanic rocks are bimodal and consist of albitized metabasalt-andesite and metarhyolites with a U-Pb age of 554 ± 6 Ma, whereas the metasedimentary units are represented by calc-silicate, marble, and pelitic gneisses. The iron oxide-apatite mineralization occurs as (i) banded–stratabound lenses/layers composed of magnetite (50–70%), with or without ilmenite exsolution; apatite (≤8%); monazite; and locally subordinate copper sulfides (~2%); (ii) massive magnetite-(specular hematite)-apatite bodies; (iii) disseminated and vein magnetite-apatite within albitized metadiorite; (iv) massive rhombohedral hematite bodies; and (v) garnet-magnetite type. The host rocks also display marialite, diopside, albite, and epidote (sodic-calcic alteration), biotite and K feldspar (potassic alteration), chlorite and epidote in lower-T hydrothermal alteration assemblages. Mineral chemistry data reveal that (i) except for vein types, apatite in all the other occurrences is F rich (2.4 ≤ F ≤ 4.4%) and low in Cl (<0.5%), and (ii) magnetite contains variable concentrations of Ti, V, Cr and Ni attributed to both igneous and hydrothermal environments. In addition, the magnetite of the stratabound occurrence is low in TiO2 (≤1.6%); however, its oxy-exsolutions are rich in TiO2 (14–52%), indicating a titanium-rich original iron oxide. The low sulfide content and high concentration of apatite indicate that the investigated Fe-P occurrences are of the IOA type, similar to those of IOA provinces elsewhere, such as Kiruna, El Laco, Gushan, Pea Ridge, Pilot Knob, and Bafq. Hence, the discovery of these occurrences in the Neoproterozoic Santa Quitéria magmatic arc has a twofold metallogenic significance: (i) these are the first records of IOA-type deposits in Brazil; and (ii) open a favorability potential for the exploration of IOCG-type deposits in this tectonic domain.