Petrology of granulite-facies metapelites of the Highland Complex, Sri Lanka: implications for the metamorphic zonation and the P-T path

Raase, P.; Schenk, Volker

doi:10.1016/0301-9268(94)90054-x

Cited by 72 publications

(67 citation statements)

References 30 publications

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“…In the HC, metamorphic pressures and temperatures decrease from 8-9 kbar and 800-900 0 C in the east and southeast to 4.5-6 kbar and 600-700 0 C in the southwest (Faulhaber and Raith, 1991, Schumacher and Faulhaber, 1994, Raase and Schenk, 1994Kriegsman and Schumacher, 1999;Malaviarachchi and Takasu, 2011b;Dharmapriya et al 2014). Evidences of UHT metamorphism have been reported only from few localities in the central Highland Complex (Osanai, 1989;Kriegsman and Schumacher, 1999;Osanai et al, 2000Osanai et al, , 2006Osanai, 2003, 2004a;Sajeev et al, 2007 and2010) and rarely in the southwestern part (Sajeev and Osanai, 2004b) from pelitic, mafic and quartzo-feldspathic granulites.…”

Section: Accepted Manuscriptmentioning

confidence: 95%

Rare evidence for formation of garnet+corundum during isobaric cooling of ultrahigh temperature metapelites: New insights for retrograde P–T trajectory of the Highland Complex, Sri Lanka

Dharmapriya

Malaviarachchi

Galli

et al. 2015

Lithos

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Section: Accepted Manuscriptmentioning

confidence: 95%

Rare evidence for formation of garnet+corundum during isobaric cooling of ultrahigh temperature metapelites: New insights for retrograde P–T trajectory of the Highland Complex, Sri Lanka

Dharmapriya

Malaviarachchi

Galli

et al. 2015

Lithos

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“…6, T82-1). The width of the two phase field garnet-rutile (+sillimanite+quartz+K-feldspar) is Metapelites containing the low-variance assemblage garnet-K-feldspar-plagioclase-biotite-alumosilicatesimilar to that found in the south-east Highland Complex of Sri Lanka (Raase & Schenk, 1994) and quartz exhibit a strong variation of Fe/Mg-ratios in coexisting garnet and biotite. This is obvious from the indicates overstepping of the reaction Bt+Ilm+Qtz= Grt+Rt+Kfs+H 2 O in the Pare and Usambara AFM-diagram (Fig.…”

Section: Kfs+grt+h 2 O=qtz+ky+btmentioning

confidence: 97%

High‐pressure granulite facies metamorphism in the Pan‐African belt of eastern Tanzania: P–T–t evidence against granulite formation by continent collision

Appel

Möller

Schenk

1998

Journal Metamorphic Geology

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112

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To constrain the tectonic history of the Pan-African belt in Tanzania, we have studied the P-T evolution of granulites from northern and eastern Tanzania representative for a large part of the southern PanAfrican belt of East Africa (e.g. Pare, Usambara, Ukaguru and Uluguru Mountains). Thermobarometry (conventional and multireaction equilibria) on enderbites and metapelites gives 9.5-11 kbar and 810±40°C during peak metamorphism at 650-620 Ma. This is consistent with the occurrence of both sillimanite and kyanite in metapelites and of the high-P granulite facies assemblage garnet-clinopyroxenequartz in mafic rocks. Peak metamorphic conditions are surprisingly similar over a very large area with N-S and E-W extents of about 700 and 200 km respectively. The prograde metamorphic evolution in the entire area started in the kyanite field but evolved mainly within the sillimanite stability field. The retrograde P-T evolution is characterized by late-stage kyanite in metapelites and garnet-clinopyroxene coronas around orthopyroxene in meta-igneous rocks. This is in agreement with thermobarometric results and isotopic dating, indicating a period of nearly isobaric and slow cooling prior to tectonic uplift. The anticlockwise P-T path could have resulted from magmatic underplating and loading of the lower continental crust which caused heating and thickening of the crust. Substantial postmetamorphic crustal thickening of yet unknown age (presumably after 550 Ma) led subsequently to the exhumation of high-P granulites over a large area. The results are consistent with formation of the Pan-African granulites at an active continental margin where tonalitic intrusions caused crustal growth and heating 70-100 Ma prior to continental collision. The P-T -t path contradicts recent geodynamic models which proposed tectonic crustal thickening due to continental collision between East and West Gondwana as the cause of granulite formation in the southern part of the Pan-African belt.

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“…Petrological research has concentrated on metamorphosed basaltic/gabbroic to intermediate rocks (Sandiford et al 1988;Schumacher et al 1990;Faulhaber & Raith 1991;Schumacher & Faulhaber 1994), felsic charnockites (Prame 1991a) and metamorphosed pelitic rocks (Prame 1991b;Raase & Schenk 1994;Hiroi et al 1994). The field P-Tgradient has further been substantiated by thermobarometry on metabasites and charnockites (Fig.…”

Section: Metamorphic Evolution and P-t Path(s)mentioning

confidence: 98%

“…The field P-Tgradient has further been substantiated by thermobarometry on metabasites and charnockites (Fig. 4;Schumacher et al 1990;Faulhaber & Raith 1991), by the distribution of biotite + Fe-Ti-oxides (Schumacher et al 1990) and biotite dehydration reactions (Raase & Schenk 1994), and by the trend in the Ti-content of amphiboles (Schumacher et al 1990). The maximum recorded pressures decrease from c. 9 to 10kbar in the central and eastern part of the HC, including the Kataragama Outlier (Fig.…”

Section: Metamorphic Evolution and P-t Path(s)mentioning

confidence: 99%

Proterozoic crustal evolution of southernmost India and Sri Lanka

Braun

Kriegsman

2003

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The Southern Granulite Terrain of India comprises four Proterozoic domains (from north to south): the Madurai Block, and the Achankovil, Ponmudi and Nagercoil Units. All but the Achankovil Unit share similarities with the Highland Complex of Sri Lanka: (1) evidence for Palaeoproterozoic crust formation (from U-Pb ages and 2.0–3.0 Ga Nd model ages); and (2) Pan-African ultrahigh-temperature metamorphism between 610 and 550 Ma. More specifically, the Ponmudi Unit and the Madurai Block share lithological and petrological characteristics with the low-P and high-P domains of the Highland Complex, respectively. The Achankovil Unit is correlated with the Wanni Complex of Sri Lanka on the basis of lithologies and Nd model ages (1.0–2.0Ga). These domains and the Vijayan and Kadugannawa Complexes of Sri Lanka represent Late Mesoproterozoic-Early Neoproterozoic crustal domains.Similarities in tectonic style, degree of metamorphism and Neoproterozoic U-Pb ages, suggest a common Pan-African tectonothermal evolution for the lower crustal domains of southern India, Sri Lanka and the Lützow-Holm Bay of Eastern Antarctica. Sri Lanka may have been located at the junction between the Mozambique Belt and a second belt partly involving areas that underwent a Grenvillian high-grade event during the formation of Rodinia. Madagascar shows a similar Pan-African metamorphic overprint, but is located in a different position and lacks the influence of the second belt. Alternative views are discussed.

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Petrology of granulite-facies metapelites of the Highland Complex, Sri Lanka: implications for the metamorphic zonation and the P-T path

Cited by 72 publications

References 30 publications

Rare evidence for formation of garnet+corundum during isobaric cooling of ultrahigh temperature metapelites: New insights for retrograde P–T trajectory of the Highland Complex, Sri Lanka

Rare evidence for formation of garnet+corundum during isobaric cooling of ultrahigh temperature metapelites: New insights for retrograde P–T trajectory of the Highland Complex, Sri Lanka

High‐pressure granulite facies metamorphism in the Pan‐African belt of eastern Tanzania: P–T–t evidence against granulite formation by continent collision

Proterozoic crustal evolution of southernmost India and Sri Lanka

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