Metamorphic reactions in dry and aluminous granulites: a Perple_X P–T pseudosection analysis of the influence of effective reaction volume

Nasipuri, Pritam; Bhattacharya, Abhijit; Das, Suman

doi:10.1007/s00410-008-0335-8

Cited by 37 publications

(21 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the presence of sapphirine in a rock does not immediately indicate that the rockdand terranednecessarily records temperatures in excess of 900 C. For example, Kruckenberg and Whitney (2011) and Goergen and Whitney (2012b) reported symplectic sapphirine in quartzabsent MgeAl-rich rocks that attained temperatures of approximately 750 C. In addition, there are a number of occurrences of sap phirineespinelebiotite-bearing rocks (AE corundum AE ortho pyroxene AE plagioclase AE sillimanite AE garnet AE chlorite, and all quartz-absent) that appear to record temperatures less than 900 C (e.g. Oliver and Jones, 1965;Kelsey et al, 2005;Prakash and Sharma, 2008;Raith et al, 2008;Sharma and Prakash, 2008;Nasipuri et al, 2009;Prakash et al, 2013;Sarbajna et al, 2013). Ferric iron is known to expand the stability of sapphirine to lower temperatures (e.g.…”

Section: Nomentioning

confidence: 94%

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

Section: Nomentioning

confidence: 94%

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

show abstract

“…Sapphirine occurring in a silica-saturated but oxidizing system recording non-UHT conditions sets a precedent, although numbers of Spr-Spl-Bt-bearing, but Qz-absent rocks, have been obtained temperatures less than 900 • C (e.g. Nasipuri et al, 2009;Prakash et al, 2013;Raith et al, 2008;Sharma and Prakash, 2008;Sarbajna et al, 2013), and even down to 750 • C (Kruckenberg and Whitney, 2011), as reviewed in Kelsey and Hand (2015).…”

Section: Peak P-t Conditions and P-t Pathmentioning

confidence: 98%

Short-lived high-temperature prograde and retrograde metamorphism in Shaerqin sapphirine-bearing metapelites from the Daqingshan terrane, North China Craton

Jiao

Guo

Wang

et al. 2015

Precambrian Research

View full text Add to dashboard Cite

“…Sapphirine-bearing granulites have been reported in high-grade terranes in Antarctica (e.g., Ellis, 1980;Grew, 1980;Dallwitz, 1986;Motoyoshi and Hensen, 2001;Iwamura et al, 2013), Canada (e.g., Morse and Talley, 1971;Arima and Grower, 1991), the Limpopo Belt (e.g., Harris and Holland, 1984;Perchuk, 2011;Tsunogae and Van Reenen, 2011), Madagascar (e.g., Nicollet, 1990;Gonçalves et al, 2004), the Eastern Ghats Belt, India (e.g., Grew, 1982;Dasgupta et al, 1995;Nasipuri et al, 2009) and the Brasília Belt, central Brazil (Moraes et al, 2002;Baldwin et al, 2005). The occurrence of this rock type is relevant to the reconstruction of the metamorphic history and the geotectonic evolution of these terranes, because they preserve a variety of prograde-and retrograde-related microstructures formed at extreme thermal conditions (Kienast and Ouzegane, 1987).…”

Section: Introductionmentioning

confidence: 99%

Metamorfismo de temperatura ultra-alta de granulitos com safirina de 2,0 Ga do Bloco Itabuna-Salvador-Curaçá, Bahia, Brasil

Barbosa

Leal

Fuck

et al. 2017

Geol. USP. Sér. Cient.

View full text Add to dashboard Cite

A área de pesquisa se situa no Cráton do São Francisco, no sul da Bahia, Brasil. Nessa região, no segmento crustal Bloco Itabuna-Salvador-Curaçá (BISC), ocorrem rochas supracrustais associadas a gnaisses tonalíticos/trondhjemíticos a monzoníticos e rochas máficas subordinadas, de idades arqueana e paleoproterozoica, todos fortemente deformados e reequilibrados na fácies granulito em 2,07 a 2,08 Ga. As rochas supracrustais incluem granulitos com safirina constituídos por quartzo, ortopiroxênio, silimanita, granada, mesopertita, plagioclásio, biotita e cordierita. Com base nos arranjos microestruturais entre os minerais constituintes dos granulitos com safirina, a paragênese de pico metamórfico é Grt1 + Opx1 + Bt1 + Qtz + Sil1 + Spr1 + Mp. Microestruturas de reações entre minerais, como coroas de simplectitos ao redor de porfiroblastos, permitiram identificar as seguintes paragêneses retrógradas, interpretadas como formadas durante a ascensão tectônica dessas rochas: Grt1 ± Qtz = Opx2 + Sil2, Grt1 = Opx2 + Spr2 (+ Sil2); Opx1 + Sil1 + Qtz = Crd e Grt1 + Qtz = Opx3 + Crd. Por sua vez, simplectitos de Bt2 + Qtz formados pela reação Opx1-2 + Mp + H2O = Bt2 + Qtz estão relacionados à evolução retrógrada durante resfriamento. Cálculos termobarométricos realizados com aplicação de termobarômetros clássicos e método de multiequilíbrios (THERMOCALC, por exemplo) indicaram P = 7-11 kbar e T ≥ 900°C para os granulitos com safirina. Um dos mecanismos associados à elevada temperatura está relacionado à adição de material radioativo com a presença de magmas basálticos durante a formação do BISC. A cristalização fracionada desses magmas produziu intrusões tonalíticas que datam de aproximadamente de 2,15 a 2,13 Ga, próximo do pico do metamorfismo de 2,07 a 2,08 Ga.

show abstract

Metamorphic reactions in dry and aluminous granulites: a Perple_X P–T pseudosection analysis of the influence of effective reaction volume

Cited by 37 publications

References 42 publications

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

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

Short-lived high-temperature prograde and retrograde metamorphism in Shaerqin sapphirine-bearing metapelites from the Daqingshan terrane, North China Craton

Metamorfismo de temperatura ultra-alta de granulitos com safirina de 2,0 Ga do Bloco Itabuna-Salvador-Curaçá, Bahia, Brasil

Contact Info

Product

Resources

About