Revisiting Ultrahigh Temperature Granulites of Sri Lanka: New Prograde and Retrograde Mineral Textures from the Highland Complex

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作者
Malaviarachchi, Sanjeewa P. K. [1 ,2 ]
Dharmapriya, Prasanna L. [1 ,2 ]
机构
[1] Univ Peradeniya, Dept Geol, Peradeniya, Sri Lanka
[2] Univ Peradeniya, Postgrad Inst Sci, Peradeniya, Sri Lanka
关键词
HIGH-GRADE ROCKS; SAPPHIRINE-BEARING GRANULITES; CALC-SILICATE GRANULITES; ARCHEAN NAPIER COMPLEX; AL-RICH GRANULITES; SPINEL PLUS QUARTZ; P-T PATH; CRUSTAL METAMORPHISM; EAST ANTARCTICA; ORTHO-PYROXENE;
D O I
暂无
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In order to investigate probable multiple metamorphic events including Ultrahigh Temperature (UHT) metamorphism experienced by Sri Lankan metamorphic rocks, we undertook extensive sampling of granulites covering the whole Highland Complex (HC) for comprehensive studies on petrology, geochemistry and geochronology. The studied UHT metamorphic rocks are sapphirine, spine] and sillimanite bearing garnet-orthopyroxene gneiss, sapphirine and spinet bearing garnet-orthopyroxene-sillimanite gneiss, sapphirine and spinel bearing garnet-sillimanite gneiss, spinel bearing garnetiferrous quartzo-feldspathic gneiss, corundum and spinel bearing garnet-sillimanite-graphite gneiss and spinel bearing garnet-sillimanite-cordierite-graphite gneiss. UHT minerals and mineral assemblages occurring in these rocks are sapphirine, orthop yroxene+sillimanite+quartz, spinel + quartz and garnet+orthopyroxene+cordierite. The presence of orthopyroxene+sillimanite+quartz, spinel + quartz assemblages could indicated the metamorphic temperatures >900 degrees C. The occurrence of kyanite inside the garnet, and sillimanite as an abundant mineral in the matrix indicate the clockwise P-T trajectory. Occurrence of orthopyroxene + sillimanite + quartz, imply the peak metamorphic history at UHT conditions under relatively higher pressures. Decompression histories are inferred mainly by cordierite+orthopyroxene symplectites around garnet. Above mineral textures demonstrate clear evidence for UHT metamorphism of the studied rocks. Further studies on thermobarometry, geochemistry and geochronology are underway to elaborate spatial and temporal evolution of the UHT pelitic granulites of the Highland Complex, Sri Lanka.
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页码:159 / 171
页数:13
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