Dating coeval mafic magmatism and ultrahigh temperature metamorphism in the Anápolis–Itauçu Complex, Central Brazil

Giustina, Maria Emilia Schutesky Della; Pimentel, Márcio Martins; Filho, César Fonseca Ferreira; Hollanda, Maria Helena Bezerra Maia de

doi:10.1016/j.lithos.2010.11.004

Cited by 48 publications

(29 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…650 -640 Ma, suggesting that UHT metamorphism, emplacement of mafic magmas and anatexis were partially coeval (Piuzana et al 2003b, Della Giustina et al 2011. T DM Sm-Nd model ages of orthogranulites fall into two age intervals, between 2.3 -1.9 Ga and 1.7 -1.4 Ga, and ε Nd (T) values are negative, ranging from -9.3 to -1.4 (Piuzana et al 2003a).…”

Section: Anápolis-itauçu Complexmentioning

confidence: 95%

“…The ages of these two magmatic systems are still controversial. Ferreira Filho et al (2010), Pimentel et al (2006) and Della Giustina et al (2011) suggest that the western part of the complexes and the associated volcano-sedimentary sequences of Juscelândia, Indaianópolis and Palmeirópolis are mesoproterozoic in age, whereas the eastern part crystallized at ca. 780 Ma.…”

Section: The Barro Alto Niquelândia and Canabrava Mafic-ultramafic Lmentioning

confidence: 99%

See 1 more Smart Citation

The tectonic evolution of the Neoproterozoic Brasília Belt, central Brazil: a geochronological and isotopic approach

Pimentel

2016

Braz. J. Geol.

Self Cite

115

View full text Add to dashboard Cite

ABSTRACT:The Brasília Belt is one of the most complete Neoproterozoic orogens in western Gondwana. Rapid progress on the understanding of the tectonic evolution of the belt was achieved due to new U-Pb data, combined with Sm-Nd and Lu-Hf analyses. The evolution of the Brasília orogen happened over a long period of time (900 -600 Ma) involving subduction, magmatism and terrain accretion, as a result of the consumption of the Goiás oceanic lithosphere. Provenance studies, based on U-Pb zircon data, indicate that the sedimentary rock units record different tectonic settings and stages of the evolution of the orogen. The Paranoá and Canastra groups represent passive margin sequences derived from the erosion of the São Francisco Craton. The Araxá and Ibiá groups, however, have dominant Neoproterozoic detrital zircon populations, as young as 650 Ma, suggesting derivation from the Goiás Magmatic Arc. The Goiás Magmatic Arc represents a composite arc terrain, formed by the accretion of older (ca. 0.9 -0.8 Ga) intraoceanic island arc(s), followed by more evolved continental arcs. It extends for several thousand kilometers, from SW Goiás, through NE Brazil and into Africa. Metamorphism took place between 650 -630 Ma reflecting final closure of the Goiás Ocean and continental collision. KEYWORDS: Brasília Belt; Neoproterozoic; U-Pb geochronology; Sediment provenance. RESUMO: A Faixa Brasília é um dos mais completos orógenos Neoproterozoicos no Gondwana Ocidental. Durante os últimos dez anos, o rápido progresso no entendimento da evolução tectônica desse orógeno foi proporcionado pela produção de novos dados geocronológicos U-Pb SHRIMP e LA-ICPMS, combinados com análises Sm-Nd e Lu-Hf. Os dados demonstraram que a evolução da Faixa Brasília acontenceu ao longo de um prolongado intervalo de tempo (900 -600 Ma), envolvendo subducção, atividade ígnea e acreção de terrenos, como resultado do consumo da litosfera do oceano Goiás. Estudos de proveniência de sedimentos baseados em geocronologia U-Pb de minerais detríticos indicam que as unidades sedimentares da Faixa

show abstract

Section: Anápolis-itauçu Complexmentioning

confidence: 95%

Section: The Barro Alto Niquelândia and Canabrava Mafic-ultramafic Lmentioning

confidence: 99%

The tectonic evolution of the Neoproterozoic Brasília Belt, central Brazil: a geochronological and isotopic approach

Pimentel

2016

Braz. J. Geol.

Self Cite

115

View full text Add to dashboard Cite

show abstract

“…The 'clockwise' (orange) vs. 'anticlockwise' (blue) notation is defined on the basis of pressure increasing up the page and temperature increasing from left to right and indicates that PeT path shape is independent of timescale. metamorphism has been classified, ranging from 'short', of the order of approximately <5e40 Myr (Table 2; Schmitz and Bowring, 2003;Baldwin and Brown, 2008;Clark et al, 2009;Leite et al, 2009;Santosh et al, 2009cSantosh et al, , 2012Santosh et al, , 2013Schmitz et al, 2009;Brandt et al, 2011;Cutts et al, 2011a;Galli et al, 2011;Giustina et al, 2011;Jöns and Schenk, 2011;Orejana et al, 2011;Guo et al, 2012;Xiang et al, 2012;Nakano et al, 2013;Bhowmick et al, 2014;; and 'long', of the order of approximately !40 Myr (Baba et al, 2010;Das et al, 2011;Korhonen et al, 2011;Smithies et al, 2011;Drüppel et al, 2013;Korhonen et al, 2013b;Walsh et al, 2014). The timescale of UHT metamorphism for a particular locality/terrane will be dependent on the longevity of the heat source as well as numerous other factors discussed earlier (see section 8) that comprise the total geologic and tectonic system (Brown and Korhonen 2009).…”

Section: Timescales and Geochronometersmentioning

confidence: 99%

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

Kelsey

Hand

2015

Geoscience Frontiers

377

285

View full text Add to dashboard Cite

a b s t r a c tUltrahigh temperature (UHT) metamorphism is the most thermally extreme form of regional crustal metamorphism, with temperatures exceeding 900 C. UHT crustal metamorphism is recognised in more than 50 localities globally in the metamorphic rock record and is accepted as 'normal' in the spectrum of regional crustal processes. UHT metamorphism is typically identified on the basis of diagnostic mineral assemblages such as sapphirine þ quartz, orthopyroxene þ sillimanite AE quartz and osumilite in MgeAlrich rock compositions, now usually coupled with pseudosection-based thermobarometry using internally-consistent thermodynamic data sets and/or Al-in-Orthopyroxene and ternary feldspar thermobarometry. Significant progress in the understanding of regional UHT metamorphism in recent years includes: (1) development of a ferric iron activityecomposition thermodynamic model for sapphirine, allowing phase diagram calculations for oxidised rock compositions; (2) quantification of UHT conditions via trace element thermometry, with Zr-in-rutile more commonly recording higher temperatures than Ti-in-zircon. Rutile is likely to be stable at peak UHT conditions whereas zircon may only grow as UHT rocks are cooling. In addition, the extent to which Zr diffuses out of rutile is controlled by chemical communication with zircon; (3) more fully recognising and utilising temperature-dependent thermal properties of the crust, and the possible range of heat sources causing metamorphism in geodynamic modelling studies; (4) recognising that crust partially melted either in a previous event or earlier in a long-duration event has greater capacity than fertile, unmelted crust to achieve UHT conditions due to the heat energy consumed by partial melting reactions; (5) more strongly linking UePb geochronological data from zircon and monazite to PeT points or path segments through using Y þ REE partitioning between accessory and major phases, as well as phase diagrams incorporating Zr and REE; and (6) improved insight into the settings and factors responsible for UHT metamorphism via geodynamic forward models. These models suggest that regional UHT metamorphism is, principally, geodynamically related to subduction, coupled with elevated crustal radiogenic heat generation rates.Ó 2014, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

show abstract

“…100 Ma; for example, Korhonen, Clark, Brown, Bhattacharya, & Taylor, ; Walsh et al., ) UHT events have been reported. The synthesis presented by Kelsey and Hand () nevertheless highlights that, for a single terrane, the time‐scale of UHT metamorphism interpreted by different authors are widely different (e.g., Anápolis–Itauçu complex, Brazil: Baldwin & Brown, ; compared to Della Giustina, Pimentel, Ferreira Filho, & de Hollanda, ). These complications arise mainly from contrasting interpretations of zircon and monazite U–Pb geochronological data relative to P – T conditions retrieved from metamorphic phase equilibria modelling (Harley, ; Kelsey & Hand, ).…”

Section: Introductionmentioning

confidence: 99%

Two successive phases of ultrahigh temperature metamorphism in Rogaland, S. Norway: Evidence from Y‐in‐monazite thermometry

Laurent

Duchêne

Bingen

et al. 2018

Journal Metamorphic Geology

View full text Add to dashboard Cite

In Rogaland, South Norway, a polycyclic granulite facies metamorphic domain surrounds the late‐Sveconorwegian anorthosite–mangerite–charnockite (AMC) plutonic complex. Integrated petrology, phase equilibria modelling, monazite microchemistry, Y‐in‐monazite thermometry, and monazite U–Th–Pb geochronology in eight samples, distributed across the apparent metamorphic field gradient, imply a sequence of two successive phases of ultrahigh temperature (UHT) metamorphism in the time window between 1,050 and 910 Ma. A first long‐lived metamorphic cycle (M1) between 1,045 ± 8 and 992 ± 11 Ma is recorded by monazite in all samples. This cycle is interpreted to represent prograde clockwise P–T path involving melt production in fertile protoliths and culminating in UHT conditions of ~6 kbar and 920°C. Y‐in‐monazite thermometry, in a residual garnet‐absent sapphirine–orthopyroxene granulite, provides critical evidence for average temperature of 931 and 917°C between 1,029 ± 9 and 1,006 ± 8 Ma. Metamorphism peaked after c. 20 Ma of crustal melting and melt extraction, probably supported by a protracted asthenospheric heat source following lithospheric mantle delamination. Between 990 and 940 Ma, slow conductive cooling to 750–800°C is characterized by monazite reactivity as opposed to silicate metastability. A second incursion (M2) to UHT conditions of ~3.5–5 kbar and 900–950°C, is recorded by Y‐rich monazite at 930 ± 6 Ma in an orthopyroxene–cordierite–hercynite gneiss and by an osumilite gneiss. This M2 metamorphism, typified by osumilite paragenesis, is related to the intrusion of the AMC plutonic complex at 931 ± 2 Ma. Thermal preconditioning of the crust during the first UHT metamorphism may explain the width of the aureole of contact metamorphism c. 75 Ma later, and also the rarity of osumilite‐bearing assemblages in general.

show abstract

Dating coeval mafic magmatism and ultrahigh temperature metamorphism in the Anápolis–Itauçu Complex, Central Brazil

Cited by 48 publications

References 61 publications

The tectonic evolution of the Neoproterozoic Brasília Belt, central Brazil: a geochronological and isotopic approach

The tectonic evolution of the Neoproterozoic Brasília Belt, central Brazil: a geochronological and isotopic approach

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

Two successive phases of ultrahigh temperature metamorphism in Rogaland, S. Norway: Evidence from Y‐in‐monazite thermometry

Contact Info

Product

Resources

About