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Fig . 14 & IS Fig.14 Fig.IS Amphibolite patches gneisses ( Paleosome grading into represented by migmatitic amphibolite associated with a leucosome [qI13rt.z + feldspar j and melanosome [biotite + hornblende] ). Location: south west of Pandarettu . 44
of 0.75 m, along NE-SW trending fractures. A few of the amphibolite bands and boudins are also intersected by later joints and transverse tensional cracks. Filling of incompetent neosomatic material along these ruptures developed in competent fragments of amphibolites (Fig. 17) , result in the formation of structures similar to ladder veins (Holmquist, 1920). Coarsening of plagioclase and hornblende along contacts of granitic and pegmatitic injections showing intrusive relationship with the amphibolites, is also noticed. In certin localities like Kanjikkode, enclaves of amphibolite boudins in pegmatitic veins are seen. Granites are leucocratic, homogeneous rocks, pink in colour. Thick bands and sub-parallel lit par-lit injections of granite show intrusive relationships with the amphibolites (see Fig. 15 and 18l. They are biotite or amphibole bearing and often occur as smal I isometric intrusions into the gneisses. Huge boulders of granitic composition are exposed along the road to Aduppukutti Malai. These are medium grained, with quartz and feldspar as essential Exposures Pullimanpatti areas. generally pink in constituents, with specks of mafic minerals. are also reported from the Madukkarai In the former locality, feldspar colour. The general alignment of granite bodies in the western part of the Gap proper is in an east-west direction, while in the eastern part of the Gap proper, it is in NE-SW direction, conformable with the broad and is the
Page 1 and 2: GEOLOGY, METAMORPHISM AND TECTONIC
Page 3: Acknowledgement Abstract Chapter I
Page 6: Field investigations indicate that
Page 9 and 10: mineralogy of K-feldspar (46 modal
Page 12 and 13: granulite terrains. Enrichment of a
Page 14: Amphiboles of both the calc granuli
Page 19 and 20: through syn to post-thickening magm
Page 21 and 22: CHAPTER I INTRODUCTION Palghat Gap
Page 23 and 24: Fig.2(a) A view of a part of the Pa
Page 25: Narayanaswamy,1954), paucity of myl
Page 28: of movement. Aeromagnetic data of R
Page 34: Bounded by the Western Ghats, the K
Page 39 and 40: Fig.5 Coarsening of sillimanite in
Page 43: and a proven vertical extent of mor
Page 47: F1g.12 Hornblende - biotite gneiss
Page 52: direction of fracture planes. Withi
Page 57 and 58: Fig.21 Rootless isoclinal folds (F
Page 59 and 60: Fig.23 Isoclinal folds axial plane.
Page 62: Pig . 27 Concordant pegmatite belon
Page 67 and 68: The tectonic framework of the area
Page 69: inclusions of plagioclase as wel I
Page 72: the reaction:- G.rossularite + Sill
Page 77 and 78: TABLE:- 1 MICROPROBE ANALYSES OF SI
Page 79 and 80: Fig.43 .Fig.40
Page 81 and 82: Fi g.44 Fig.45 Fig.46 Fig . 47
Page 83 and 84: where biotite is almost completely
Page 85: .Fig. 48 Fig.49 Fig.SO Fig . Sl
Page 90 and 91: Fig.52 Fig.53 Fig.54 Fig.55 B6
Page 93 and 94: Fig. 56 Fig. 57 Fig. 58 Fig. 59 Cal
Page 97 and 98: Magnetite is present ubiquitously a
Page 99:
Fig.60 Fig.61 Fig.62 Fig.63 • O.S
Page 103 and 104:
Fig. 64 Fig. 65 Fig. 66 Fig. 67 Bri
Page 105:
Biotite gneiss is typically a coars
Page 109 and 110:
Fig.6B Fig.69 Fig.lO Fig.71 l e::..
Page 112 and 113:
Fig. 72 Fig. 73 Fig. 74 Fig. 75 Sie
Page 114 and 115:
Opaques constitute 0 to 6 modal per
Page 116 and 117:
(X= yel lowish green, Y= brownish g
Page 119 and 120:
11 1.7 PEGMAT I TE Pegmatites are u
Page 121 and 122:
Fig.BO Fig.Bl Fig .B2 UI
Page 125 and 126:
Average values of CaO/MgO ratios fo
Page 127:
proportion in the first two varieti
Page 135 and 136:
TABLE. 6 COMPOS I T ION OF KHONDAL
Page 138:
wt % of type I I varieties. Oxidati
Page 150:
.£.=1-5-2-3 fm c -=1-0-1-5 fm - -
Page 153:
assemb I ages (Goldsmith & Newton,
Page 157 and 158:
TABLE.9 ( c ) NIGGLI PARAMETERS ---
Page 159:
Fig.93 a). In the AlkFM diagram on
Page 162:
elements, CaO, t FeO , TiOZ and MgO
Page 171 and 172:
Rb depleted and Sr enriched nature
Page 173:
TABLE 11.a MAJOR ELEMENT ANALYSES O
Page 178:
their genesis. Amphibolites interla
Page 187:
granites, compared to hornblende-pr
Page 191:
low « 3.Z wt %), with slightly hig
Page 199:
Enrichment of almandine towards rim
Page 205:
!Table.1S). On the basis of their i
Page 212:
2C7 tempera'ture of the former. Com
Page 216 and 217:
cordierite-bearing rocks fall close
Page 219:
TABLE.l9 HICROPROBE ANALYSES OF CLI
Page 227 and 228:
The static involving changes fluid
Page 229 and 230:
to minerals with the largest grain
Page 232:
227 b. Garnet-Cordierite:- Holdaway
Page 237:
thermometric calculations is:- = [-
Page 240:
235 formulae of Raheim & Green (197
Page 243 and 244:
238 100-300 C C compared to other s
Page 245 and 246:
specified P-T conditions. However,
Page 247:
al ka I i feldspar upon cool ing. r
Page 254 and 255:
pressure-dependent equilibria: CaAI
Page 256 and 257:
Cpx and ()(CaMgSi 0 2 = 2 6 pyroxen
Page 258:
253 Bhattacharya & Sen (1985) provi
Page 268 and 269:
TABLE.21 contd ... 4000 GAR CORE-BT
Page 270:
265 TABLE.21 (b) GARNET-CORDIERITE
Page 278 and 279:
TABLE.24 b CROSSINGS OF GPAQ P-T LI
Page 281:
TABLE.25 (contd •.• ) Temperatu
Page 288:
283 which yield data on the process
Page 292:
Fig.124 H 2 0-rich inclusions Ca )
Page 297:
292 carbonic inclusion densities se
Page 309:
low density C02 rich fluids in rift
Page 313 and 314:
J08 sequences, the success in datin
Page 315:
deformation stage, would represent
Page 323:
318 ear lies t recognisable planar
Page 328 and 329:
323 to effect the quasi-isochemical
Page 330 and 331:
The rapid extension of continental
Page 333 and 334:
flanks (2) development of fissile m
Page 335 and 336:
330 extracted with Hydrochloric aci
Page 337:
Estimation of CaO and MgO 332 Twen"
Page 340:
spectrometer while measuring the co
Page 343 and 344:
13. Balasundaram, M. S . ( 1953) .
Page 345:
340 34. Boyd, F.R. and England, J.L
Page 349:
77. Fonarev,V.I. and Konilov, A.N.
Page 353 and 354:
119. Heier, K.S. (1962) amphibolite
Page 355 and 356:
141. Hutcheon, I., Froese. E, Gordo
Page 357 and 358:
162. Krauskopf, K.S. (1979) Introdu
Page 359:
185. MacDonald, G.A. (1968) Composi
Page 362 and 363:
218. Newton, R.C., Charlu, T.V. and
Page 366 and 367:
261. Raith. H.. Raase. P .. Ackerma
Page 371 and 372:
313. Srikantappa. C.and Prakash Nar
Page 373 and 374:
335. Urey, H.C. (1947). the thermod
Page 375:
357. Wood, B. J . ( 1976) . The par
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