Middle Proterozoic Vein-Hosted Gold Deposits in the Pontes e Lacerda Region, Southwestern Amazonian Craton, Brazil

Geraldes, Mauro César; Figueiredo, Bernardino Ribeiro; Tassinari, Colombo Celso Gaeta; Ebert, Hans Dirk

doi:10.1080/00206819709465282

Cited by 33 publications

(16 citation statements)

References 7 publications

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“…[22] [23] presented paleomagnetic data that support the juxtaposition of Amazonia with Laurentia-Baltica ca. 1000 Ma what is corroborated by the geologic data described in the Sunsas-Aguapei belts [47] [48] [54] and Greenville [55] and Sveconorwegian [56] in addition to the palomagnetic data comparison. In addition, [24] presented important paleomagnetic data indicating previous Amazonia and Laurentia connection at 1.20 Ga.…”

Section: Late Mesoproterozoic Reconstructions Of Rodinia (Auswus Swesupporting

confidence: 61%

An Overview of the Amazonian Craton Evolution: Insights for Paleocontinental Reconstruction

Geraldes

Tavares²,

Santos³

2015

IJG

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The Amazonian craton major accretionary and collisional processes may be correlated to supercontinent assemblies developed at several times in the Earth history. Based on geologic, structural and paleomagnetic evidence paleocontinent reconstructions have been proposed for Archean to younger times. The oldest continent (Ur) was formed probably by five Achaean cratonic areas (Kaapvaal, Western Dhawar, Bhandara, Singhhum and Pilbara cratons). Geologic evidences suggest the participation of the Archaean rocks of the Carajás region in the Ur landmass. Supercontinental 2.45 Ga Kenorland amalgamation is indicated by paleomagnetic data including Laurentia, Baltica, Australia, and Kalahari and Kaapvaal cratons. There is no evidence indicating that Amazonian craton was part of the Kenorland supercontinent.

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Section: Late Mesoproterozoic Reconstructions Of Rodinia (Auswus Swesupporting

confidence: 61%

An Overview of the Amazonian Craton Evolution: Insights for Paleocontinental Reconstruction

Geraldes

Tavares²,

Santos³

2015

IJG

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“…West of the Alto Jauru terrane area is the Santa Helena arc (200 km west from the western limit in Fig. 2), dated 1.45-1.42 Ga (Geraldes et al, 1997(Geraldes et al, , 2001Van Schmus et al, 1998, 1999 and characterized by calc-alkaline plutonism interpreted to reflect subduction of the ocean crust from W to E. The youngest tectonic event in the SW Amazonian craton includes the deformation that resulted in the 1.0-0.92 Ga Aguapeí thrust.…”

Section: The Rio Branco Suitementioning

confidence: 97%

Geochemistry and isotopic constraints on the origin of the mesoproterozoic Rio Branco ‘anorogenic’ plutonic suite, SW of Amazonian craton, Brazil: high heat flow and crustal extension behind the Santa Helena arc?

Geraldes

Bettencourt

Teixeira

et al. 2004

Journal of South American Earth Sciences

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“…1.0 Ga Sunsás Province occurs west of the Rondonian/San Ignacio Province in Bolivia (Litherland et al 1989) and includes the Sunsás and Aguapeí groups, comprised of low-grade to undeformed supracrustal sequences, and the high grade metamorphic rocks of the Nova Brasilândia Group (Rizzotto, personal communication (Table I). The tectonic event between 970-840 Ma in the Aguapeí thrust belt in SW Mato Grosso (Geraldes et al 1997) is apparently coeval with that identified in the Sunsás Province, and some authors (Tassinari and Macambira 1999) have interpreted the Aguapeí thrust belt as a branch of the Sunsás deformation front reported in Bolivia (Litherland et al 1986). …”

Section: The Amazonian Cratonmentioning

confidence: 99%

The 1590-1520 Ma Cachoeirinha magmatic arc and its tectonic implications for the Mesoproterozoic SW Amazonian craton crustal evolution

Ruiz

Geraldes

Matos

et al. 2004

An. Acad. Bras. Ciênc.

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Isotopic and chemical data of rocks from the Cachoeirinha suite provide new insights on the Proterozoic evolution of the Rio Negro/Juruena Province in SW Amazonian craton. Six U-Pb and Sm-Nd analyses in granitoid rocks of the Cachoeirinha suite yielded ages of 1587-1522 Ma and T DM model ages of 1.88-1.75 Ga (Epsilon Nd values of -0.8 to +1.0). In addition, three post-tectonic plutonic rocks yielded U-Pb ages from 1485-1389 Ma (T DM of 1.77-1.74 Ga and Epsilon Nd values from -1.3 to +1.7). Variations in major and trace elements of the Cachoeirinha suite rocks indicate fractional crystallization process and magmatic arc geologic setting. These results suggest the following interpretations: (1) The interval of 1590-1520 Ma represents an important magmatic activity in SW Amazonian craton. (2) T DM and arc-related chemical affinity support the hypothesis that the rocks are genetically associated with an east-dipping subduction zone under the older (1.79-1.74 Ga) continental margin. (3) The 1590-1520 Ma age of intrusive rocks adjacent to an older crust represents similar geological framework along the southern margin of Baltica, corroborating the hypothesis of tectonic relationship at that time.

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Middle Proterozoic Vein-Hosted Gold Deposits in the Pontes e Lacerda Region, Southwestern Amazonian Craton, Brazil

Cited by 33 publications

References 7 publications

An Overview of the Amazonian Craton Evolution: Insights for Paleocontinental Reconstruction

An Overview of the Amazonian Craton Evolution: Insights for Paleocontinental Reconstruction

Geochemistry and isotopic constraints on the origin of the mesoproterozoic Rio Branco ‘anorogenic’ plutonic suite, SW of Amazonian craton, Brazil: high heat flow and crustal extension behind the Santa Helena arc?

The 1590-1520 Ma Cachoeirinha magmatic arc and its tectonic implications for the Mesoproterozoic SW Amazonian craton crustal evolution

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