SPECIAL VOLUME TECTONIC, METAMORPHIC AND ISOTOPIC EVOLUTION OF DEEP CRUSTAL ROCKS, WITH SPECIAL EMPHASIS ON SRI LANKA Edited by M. RAITH and S. HOERNES Mineralogisch—Petrologisches Institut, Universitat Bonn, Poppelsdorfer SchloB, D-53115 Bonn, Germany CONTENTS i a a Os ebiaieb biden letaabtie cei e a ee dd a ee The Precambrian of Sri Lanka: a historical review PTAs SeAUDNUNPTUTTD isthe elaine aes nei ihsaiebebladieceeaaaheah ebaidee acicih incib eaadiaelbdiea danaaa I. Tectonic evolution Origin of compositional layering and mechanism of crustal thickening in the high-grade gneiss terrain of Sri Lanka Pic TR Ti9n. O e ID i RN... cnacicnnactisendonesicbennecebnndonncinsnsnernbennsiasssubessantessshsnsitiibatindasneabbnte Large-scale thrusting in the lower crustal basement of Sri Lanka iis UUTTINUUITTTTUIIITTD scsi indebtdade tenleapaanecinadintshadidcemiantiiaipinitana ncenminnniaiibabin Evidence for a fold nappe in the high-grade basement of central Sri Lanka: terrane assembly in the Pan-African lower crust? IRsseeris Uan TnITTIIIIDD ince cinbuiceceimrennt eindhh eidin dbe eucdlabaiileiolagtsegicheaniaanb-coaniiiiemiidniaaubbiantanin endal Gravity, magnetic and structural patterns at the deep-crustal plate boundary zone between West- and East-Gondwana in Sri Lanka Ss IENnTNlicisssesbc ti csi ieee tale eaeianaeld capable iabuitaidineiabaat annie eemeicenioniaeaiets IT. Isotopic evolution Nd isotopic mapping of the Sri Lanka basement: update, and additional constraints from Sr isotopes C.C. Milisenda, T.C. Liew, A.W. Hofmann and H. KGblle.................cccccccccsccssssesssscsccssssscesscccsesssscnsccccssssssscssesosssssssesossscees Pb isotopic discrimination of crustal domains within the high-grade basement of Sri Lanka ee ee ee eT, I... cicosienineetinetiondcabssionon pibidebiaualieliedidabenddieninaneibensonitebsctdeeneesennbeneapnionbiae U-Pb geochronology of the Sri Lankan basement a es rs I, SO, I I TE IIIT... assaininetelen lou dielebibehonensandandlosninanmni nenbeeananis Pb-loss patterns in zircons from a high-grade metamorphic terrain as revealed by different dating methods: U-Pb and Pb-Pb ages for igneous and metamorphic zircons from northern Sri Lanka I aalacsind eala nnisinnnn meena eneebiddaadinieabiieintininneuntenniaianiiin The role of fluids in granulite-facies metamorphism as deduced from oxygen and carbon isotopic compositions Io ae UE TILT RG enn centile neNbaaebhaaibinanenbenenbentd Oxygen isotope thermometry based on a refined increment method and its application to granulite-grade rocks from Sri Lanka Ia EOIN tim beats sainidhee an eiondanian negnasineneinnensitl Geochemistry of pelitic and psammopelitic Precambrian metasediments from southwestern Sri Lanka: implications for two contrasting source-terrains and tectonic settings ITI. Metamorphic evolution Metapelites: EB I Le Ne a TER A RE ny ET EE ET Evidence for prograde metamorphic evolution of Sri Lankan pelitic granulites, and implications for the development of continental crust OO ihn cinea insi aie nmeneiniadpeibaibleianiambinndomueebiiicanannindeabeihineatennmiannenaqnencsaatnienulietne Petrology of granulite-facies metapelites of the Highland Complex, Sri Lanka: implications for the metamorphic zonation and the P-T path I ia clean lca ari alle badanasinnabdibenpiiegbapalieielabenndaiiaemsietabiebsianeuninbeaies Charnockites and basic granulites: Summary and discussion of P-T estimates from garnet—pyroxene—plagioclase—quartz-bearing granulite-facies rocks from Sri Lanka R. Schumacher and S. Faulhaber Calc-silicate rocks: Reactions and textures in wollastonite—scapolite granulites and their significance for pressure-temperature—fluid histories of high-grade terranes S.L. Harley, I.C.W. Fitzsimons and I.S. Buick Petrologic phase equilibria and stable isotope fractionations of carbonate-silicate parageneses from granulite-grade rocks of Sri Lanka R. Hoffbauer and B. Spiering Feldspars: Revised two-feldspar geothermometry applied to Sri Lankan feldspars G. Voll, C. Evangelakakis and H. Kroll Incipient charnockites: A tectonic perspective of incipient charnockites in East Gondwana M. Yoshida and M. Santosh The structural setting of the Chilka Lake granulite-migmatite—anorthosite suite with emphasis on the time relation of charnockites S. Bhattacharya, $.K. Sen and A. Acharyya