Quantitative structural analyses and numerical modelling of ...

More documents

Recommendations

Info

1382J. KonopaÂsek et al. / Journal of Structural Geology 23 2001) 1373±1392Fig. 6. Schematic block-diagram of the studied area. Flat lying S2 foliation can be observed in the northern part of the studied area in the MeÏdeÏnec synform. Going to the south, the early D2 fabric is completelyreworked by D3 deformation. The Oberwiesenthal structure is not shown.58
J. KonopaÂsek et al. / Journal of Structural Geology 23 2001) 1373±1392 1383the MeÏdeÏnec antiform. In this area, the S 2 fabric is completelyreworked into a steep to subvertical E±W trendingS 3 foliation. Here, a strong sub-horizontal stretching ofquartz aggregates can be observed in several places. In thehinge zone of the MeÏdeÏnec antiform, monoclinal or conjugatekink bands are developed affecting the early S 2 metamorphicfoliation of the garnetiferous micaschist andorthogneisses. These kink bands exhibit E±W trendingaxes and kink planes, bimodally distributed with respectto ¯at-lying S 2 foliation Fig. 5e). The geometry of thesekink bands suggests that they are genetically linked to theMeÏdeÏnec antiformal D3 structure but the mechanism and thekinematics of kinking will be discussed in a separate sectionbelow.The general structure of the studied domain is shown inblock-diagram Fig. 6), summarising lithological and structuralobservations discussed above as an effect of the D3folding superimposed on the D2 fabrics.6. Problem of the L 2 and L 3 lineation solved usingaggregate-shape analysisAn important feature is the parallelism of the L 2 minerallineation in the MeÏdeÏnec synforma D2 structure) with thelineation observed in micaschists and orthogneisses of boththe MeÏdeÏnec and the KlõÂnovec antiforms. If the WNW±ESEtrending L 2 lineation in the MeÏdeÏnec synformwere rotatedby late F 2 folding, the originally EW trending, gentlyplunging L 2 lineation would become subvertical Fig. 7).This can be observed in N±S trending, steep S 2 foliationin the southern part of the Oberwiesenthal structure. Subsequentrotation of the S 2 foliation by F 3 folds with a steephinge zone will keep the orientation of the L 2 in a subverticalposition Fig. 7) . The lineation in the steep limbsof the KlõÂnovec and the MeÏdeÏnec antiforms is always foundto plunge gently to the west, however, indicating that it wasformed during the D3 deformation L 3 lineation). Consequently,the change of the L 2 into an L 3 lineation must beassociated with complete modi®cation of the D2 fabricduring the D3 deformation. In order to investigate theproposed changes to the D2 fabric ellipsoid during the D3deformation, we have carried out a shape analysis of mineralaggregates in the orthogneisses fromthe MeÏdeÏnec synformand the MeÏdeÏnec and the KlõÂnovec antiforms.In order to determine the role of the F 3 folding inpossible fabric modi®cations, an aggregate-shape analysisof K-feldspar and quartz was carried out on the porphyriticorthogneisses. Selected porphyritic augen orthogneisseswere sampled in the hinge zones and limbs of both theMeÏdeÏnec and the KlõÂnovec antiforms, as well as in theMeÏdeÏnec synformand the Oberwiesenthal structure. Twosections in each sample were studied: a) perpendicular tometamorphic foliation and parallel to mineral lineation theXZ section of the ®nite strain ellipsoid), and b) perpendicularto both foliation and lineation the YZ sectionof the ®nite strain ellipsoid). The shapes of the K-feldsparand quartz aggregates were traced on transparent sheet,digitised and then analysed. Because of the large size ofmeasured aggregates, only a limited number of measurementscould be carried out on each sample Table 1). Finitestrain ratios were calculated fromthe two principal strainellipsoid planes using a harmonic mean method Lisle,1977; Ramsay and Huber, 1983, p. 80). These ratios wereFig. 7. Succession of the lower-hemisphere equal area projections shows schematically expected evolution of the orientation of the L 2 lineation during D2 andD3 folding. Early L 2 lineation is trending E±W being subhorizontal. During late F 2 folding, the L 2 lineation does not change the orientation, but becomessteeper. The successive F 3 folding changes the orientation of steep S 2 foliation; the L 2 lineation should rotate into N±S direction maintaining its steep plunge.In the D3 structures the MeÏdeÏnec and the KlõÂnovec antiforms), however, the lineation is always E±W oriented and mostly subhorizontal.59
Page 3:
“It strikes me that all our knowl
Page 8 and 9:
Contentsviii4.7 Schulmann, Konopás
Page 11:
Dedicated to my wife Markéta, daug
Page 14 and 15:
Foreword 2First topic “Quantitati
Page 16 and 17:
Foreword 4source and freely availab
Page 18 and 19:
1. Quantitative analysis of deforma
Page 20 and 21: 1. Quantitative analysis of deforma
Page 31 and 32: Chapter 2Mechanisms of lower crusta
Page 33 and 34: 2. Mechanisms of lower crustal flow
Page 41 and 42: Chapter 3Quantitative analyses ofme
Page 43 and 44: 3. Quantitative analyses of metamor
Page 51: 3. Quantitative analyses of metamor
Page 54 and 55: Bibliography 42Culshaw, N., Beaumon
Page 56 and 57: Bibliography 44sources and trigger
Page 58 and 59: Bibliography 46Skrzypek, E., Štíp
Page 61 and 62: Journal of Structural Geology 23 20
Page 63 and 64: J. KonopaÂsek et al. / Journal of
Page 69: J. KonopaÂsek et al. / Journal of
Page 81 and 82: JOURNAL OF GEOPHYSICAL RESEARCH, VO
Page 83 and 84: SCHULMANN ET AL.: STRAIN DISTRIBUTI
Page 95: SCHULMANN ET AL.: STRAIN DISTRIBUTI
Page 98 and 99: 5 - 2 LEXA ET AL.: COLLISION IN WES
Page 106 and 107: 5 - 10 LEXA ET AL.: COLLISION IN WE
Page 114 and 115: 156O. Lexa et al. / Journal of Stru
Page 121 and 122:
DTD 5ARTICLE IN PRESSJournal of Str
Page 123 and 124:
DTD 5ARTICLE IN PRESSL. Baratoux et
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Table 1Statistical values of the qu
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Table 2Summary of parameters derive
Page 143 and 144:
Page 145 and 146:
J. metamorphic Geol., 2008, 26, 273
Page 147 and 148:
EXHUMATION IN LARGE HOT OROGEN 275m
Page 149 and 150:
Probabi l irequencyProbabi l ireque
Page 151 and 152:
EXHUMATION IN LARGE HOT OROGEN 279y
Page 153 and 154:
EXHUMATION IN LARGE HOT OROGEN 281N
Page 155 and 156:
EXHUMATION IN LARGE HOT OROGEN 283w
Page 157 and 158:
EXHUMATION IN LARGE HOT OROGEN 285a
Page 159 and 160:
EXHUMATION IN LARGE HOT OROGEN 287w
Page 161 and 162:
EXHUMATION IN LARGE HOT OROGEN 289T
Page 163 and 164:
EXHUMATION IN LARGE HOT OROGEN 291O
Page 165 and 166:
EXHUMATION IN LARGE HOT OROGEN 293r
Page 167 and 168:
EXHUMATION IN LARGE HOT OROGEN 295B
Page 169:
EXHUMATION IN LARGE HOT OROGEN 297R
Page 172 and 173:
Author's personal copyK. Schulmann
Page 174 and 175:
Page 176 and 177:
Page 178 and 179:
Page 180 and 181:
Page 182 and 183:
Page 184 and 185:
Page 186 and 187:
Page 188 and 189:
Page 190 and 191:
Page 193 and 194:
J. metamorphic Geol., 2011, 29, 79-
Page 195 and 196:
HEAT SOURCES AND EXHUMATION MECHANI
Page 197 and 198:
Page 199 and 200:
Page 201 and 202:
Page 203 and 204:
Page 205 and 206:
Page 207 and 208:
Page 209 and 210:
Page 211 and 212:
Page 213 and 214:
Page 215 and 216:
Page 217 and 218:
Page 219 and 220:
EXTRUSIONOFLOWERCRUSTINVARISCANOROG
Page 221 and 222:
Page 223 and 224:
Page 225 and 226:
Page 227 and 228:
Page 229 and 230:
Page 231 and 232:
Page 233 and 234:
Page 235 and 236:
Page 237 and 238:
Page 239 and 240:
Page 241 and 242:
Page 243 and 244:
J. metamorphic Geol., 2005, 23, 649
Page 245 and 246:
CONTRASTING TEXTURAL RECORD OF TWO
Page 247 and 248:
Page 249 and 250:
Page 251 and 252:
Page 253 and 254:
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Page 261 and 262:
Contrasting microstructures and def
Page 263 and 264:
TEXTURES OF NATURALLY DEFORMED META
Page 265 and 266:
Page 267 and 268:
Page 269 and 270:
Page 271 and 272:
Page 273 and 274:
1.0--0.9__Mg~(Mg2++Fe2+)9 Core of p
Page 275 and 276:
Page 277 and 278:
' ~'-----2~--~----TEXTURES OF NATUR
Page 279 and 280:
Page 281 and 282:
Page 283 and 284:
Page 285 and 286:
Page 287 and 288:
Page 289:
Page 292 and 293:
B10210ZÁVADA ET AL.: EXTREME DUCTI
Page 294 and 295:
Page 296 and 297:
Page 298 and 299:
Page 300 and 301:
Page 302 and 303:
Page 304 and 305:
Page 307 and 308:
ClickHereforFullArticleJOURNAL OF G
Page 309 and 310:
B10406SCHULMANN ET AL.: RHEOLOGY OF
Page 311 and 312:
Page 313 and 314:
Page 315 and 316:
Page 317 and 318:
Page 319 and 320:
Page 321 and 322:
Page 323 and 324:
Page 325 and 326:
Page 327 and 328:
Page 329 and 330:
ORIGIN OF FELSIC MIGMATITES 31Ó 20
Page 331 and 332:
ORIGIN OF FELSIC MIGMATITES 33durin
Page 333 and 334:
ORIGIN OF FELSIC MIGMATITES 35(a)Ty
Page 335 and 336:
ORIGIN OF FELSIC MIGMATITES 37(a)Pl
Page 337 and 338:
ORIGIN OF FELSIC MIGMATITES 39Grain
Page 339 and 340:
ORIGIN OF FELSIC MIGMATITES 41(a)(b
Page 341 and 342:
ORIGIN OF FELSIC MIGMATITES 43(a)(b
Page 343 and 344:
ORIGIN OF FELSIC MIGMATITES 45Fig.
Page 345 and 346:
ORIGIN OF FELSIC MIGMATITES 47produ
Page 347 and 348:
ORIGIN OF FELSIC MIGMATITES 49stron
Page 349 and 350:
ORIGIN OF FELSIC MIGMATITES 51Cmı
Page 351:
ORIGIN OF FELSIC MIGMATITES 53easte
Page 354 and 355:
104 J. FRANĚK ET AL.in terms of th
Page 356 and 357:
106 J. FRANĚK ET AL.Fig. 2. Struct
Page 358 and 359:
108 J. FRANĚK ET AL.(a)perthite po
Page 360 and 361:
110 J. FRANĚK ET AL.(a)(b)(c) (d)
Page 362 and 363:
112 J. FRANĚK ET AL.Table 1. Repre
Page 364 and 365:
114 J. FRANĚK ET AL.at these P-T c
Page 366 and 367:
116 J. FRANĚK ET AL.(a)(b)Fig. 10.
Page 368 and 369:
Page 370 and 371:
120 J. FRANĚK ET AL.Table 2. Quant
Page 372 and 373:
Page 374 and 375:
124 J. FRANĚK ET AL.Fig. 16. Inter
Page 376 and 377:
126 J. FRANĚK ET AL.development of
Page 378 and 379:
128 J. FRANĚK ET AL.Behrmann, J.H.
Page 380:
130 J. FRANĚK ET AL.Southern Bohem
show all

Quantitative structural analyses and numerical modelling of ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?