Towards the fertility trend: Unraveling the economic potential of igneous suites through whole-rock and zircon geochemistry (example from the Tapajós mineral Province, Northern Brazil)

Cassini, Lucas Villela; Moyen, Jean‐François; Cellier, Gabriel; Freitas, Bruna de; Juliani, Caetano; Laurent, Oscar

doi:10.1016/j.oregeorev.2021.104643

Cited by 4 publications

(3 citation statements)

References 84 publications

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“…discussed inRollinson (2014) andCassini et al (2022). Like demonstrated byRollinson (2014) in the case of felsic magmas, like was determined that is the case of this granite by using B-A diagram modi ed by Villaseca et al (1998), the accessory minerals in uence the REE pattern although the presence of them in small quantities, leading to a high fractionated spectrum, for example the presence of zircon deplete the heavy REE.…”

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confidence: 71%

Bruçó granite (NE Portugal): a two-mica granite yet to be unveiled.

Mota,

Sant’Ovaia,

Noronha

2024

Preprint

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The Bruçó granite outcropping in the NE of Portugal, is a porphyritic two-mica granite having associated, near the border of the massif, some pegmatites with tourmaline and quartz veins with W mineralization. Composed mainly of quartz, plagioclase, potassium feldspar, muscovite, biotite, and accessory minerals such apatite, chlorite, sericite, zircon, ilmenite, monazite, rutile, and tourmaline. Its paramagnetic behavior is primarily attributed to the presence of biotite and ilmenite, categorizing it as an "ilmenite type" granite. Variations in its biotite content and tourmaline, influence its magnetic properties and ellipsoid shape. The granite's AMS fabric aligns with the Moncorvo-Bemposta shear zone, indicating its emplacement during active tectonic activity. Geochemical analysis classifies it as a peraluminous granite. Despite its spatial association with tungsten mineralization, the Bruçó granite does not exhibit specialization in tungsten. Analysis of REE spectra reveals consistent behavior, influenced by accessory minerals like zircon, leading to fractionated spectra. Comparisons with other two-mica granites from Central Iberian Zone highlight its unique titanium content and mineral composition, aiding in understanding granitic patterns and classifications.

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mentioning

confidence: 71%

Bruçó granite (NE Portugal): a two-mica granite yet to be unveiled.

Mota,

Sant’Ovaia,

Noronha

2024

Preprint

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“…Estudos geocronológicos mais recentes permitem a divisão do registro geológico na região da PMT em dois grupos, ambos com sequências intrusivas e extrusivas. Cassini et al (2022) propuseram a divisão entre uma sequência magmática antiga, de ca. 2,0-1,95 Ga e uma sequência magmática nova, de rochas entre 1,89 a 1,86 Ga. A província apresenta composição predominantemente granítica, característica observada também na PMT e na área de estudo, na porção leste da província (Fig.…”

Section: Província Mineral Do Tapajósunclassified

“…2,0 a 1,87 Ga) e é composta por múltiplas suítes ígneas que representam o magmatismo de arco e de regime colisional a pós-colisional. Cassini et al (2022) propõe uma divisão do registro da província em duas sequências magmáticas, onde, a mais antiga (ca. 2,0-1,95 Ga), representa o magmatismo de arco, e a mais nova (ca.…”

Section: Apresentação 11 Introduçãounclassified

Integração de dados aerogeofísicos e mapeamento litológico preditivo com Self-Organizing Maps na Província Mineral do Tapajós, Cráton Amazônico

Cellier

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The Tapajós Mineral Province (TMP), located in the central-south region of Amazonian Craton, stands out for its gold production for over six decades and has demonstrated huge potential for occurrences of magmatic-hydrothermal polymetallic deposits, especially epithermal and porphyry types. However, even with all the efforts made in the last few decades, including the recent publication of the province geologic map, the geologic knowledge is uncomplete, a reality that disfavor the development of the mineral exploration in the region. This situation is aggravated by the natural difficulties that this region imposes, such as access difficulties, dense forest cover and thick weathering profile.The use of indirect mapping techniques in regions with similar difficulties is expanding in the last few years. In this context, predictive mapping based on Machine Learning techniques, using different datasets, has proved to be a useful tool to characterize and delimitate geological units, recognize compositional anomalies, geological structures and more.In this contribution, aerogeophysical data is processed and interpreted to investigate the geology of the eastern region of the TMP, in the light of the geologic map.The obtained data were utilized as parameters for the production of a predictive geologic map using Self-Organizing Maps (SOM), an unsupervised Machine Learning technique, which analyses and structure the data independently, clustering the samples according to their similarities, which is recognized by the algorithm itself.The results evidence the strong contribution from the aerogeophysical data in the production of the geologic map, with strong correlation between the contacts of both maps, attesting a successful outcome from the use of SOM in this study. However, in many regions of the geologic map, defined geological units and structures are not supported by the data obtained in this study, especially in regions with few or no-data from previous field surveys.The SOM technique was effective in the creation of a predictive geologic map and appears to be more efficient that the use of geophysical data alone to map previously described geological units and to infer units in not-studied regions. It also has potential to infer areas affected by hydrothermal activity, which can be useful in the elaboration of exploratory models and defining prospective areas for exploration.

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Utilizing compositions of zircon and apatite for prospecting of Cu-Mo-Auporphyry mineralization in the Pekinsky and Tessemsky granitoid massifs of the Taimyr-Severozemelskaya folded area

Berzin,

Petrov,

Konopelko

et al. 2024

Lithosphere

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Research subject. The Tessemsky granite massif is located in the North Taimyr tectonic zone, surrounded by Cambrian rocks. The Pekinsky granite massif is located within the Central Taimyr zone, surrounded by metamorphosed Proterozoic rocks. Aim. To develop a methodology for using the composition of accessory granitoid minerals when prospecting Cu-Mo-Au-porphyry mineralization on the example of the Pekinsky and Tessemsky granitoid massifs of the Taimyr Peninsula. Materials and methods. Accessory zircon and apatite contained in two granitoid samples from the Pekinsky massif (P1, P2) and two granitoid samples from the Tessemsky massif (T2, T3) were studied. Their mineral composition was examined using an EPMA Cameca SX100 instrument. The element content in minerals was determined by LA-ICPMS using an NexION 300S instrument equipped with an NWR 213 attachment. Results. Most of the zircons from the Pekinsky and Tessemsky massifs were formed at T < 738°C in oxidized magma with ΔFMQ of 0.6–2.6, which is a favorable sign for the identification of Cu-Mo-Au-porphyry mineralization. Zircons are characterized by elevated (Eu/Eu*)Y and (Ce/Nd)n/Y ratios, which is also a favorable, though not a strongly reliable, sign for identifying porphyry mineralization. The Eu/Eu* and Sr/Y ratios in the apatites from the Tessemsky massif are higher than those in the apatites from the Pekinsky massif. The rock compositions of both massifs fall within the fields of adakites on the classification diagrams. The estimates of oxygen fugacity (logfO2) calculated from Mn in apatites for four samples agree well within the error limits. Conclusion. Specific features of using the composition of accessory minerals (zircon and apatite) for prospecting the Cu-Mo-Au-porphyry mineralization associated with granitoids were considered. Accessory indicator minerals can be used to rank granitoid massifs in order to assess their ore content. The example of two granite intrusions of the Taimyr Peninsula made it was possible to show that the Tessemsky massif is more promising for the discovery of associated Cu-Mo-Auporphyry mineralization than the Pekinsky massif.

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Towards the fertility trend: Unraveling the economic potential of igneous suites through whole-rock and zircon geochemistry (example from the Tapajós mineral Province, Northern Brazil)

Cited by 4 publications

References 84 publications

Bruçó granite (NE Portugal): a two-mica granite yet to be unveiled.

Bruçó granite (NE Portugal): a two-mica granite yet to be unveiled.

Integração de dados aerogeofísicos e mapeamento litológico preditivo com Self-Organizing Maps na Província Mineral do Tapajós, Cráton Amazônico

Utilizing compositions of zircon and apatite for prospecting of Cu-Mo-Auporphyry mineralization in the Pekinsky and Tessemsky granitoid massifs of the Taimyr-Severozemelskaya folded area

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