in Jurassic and Cretaceous Stratigraphy

More documents

Recommendations

Info

Earth Science Frontiers, Vol. 17, Special Issue, Aug. 2010 ISSN 1005-2321 Biomarkers for A Widespread Tethyan Flooding on Mexican Shelves During the Early Tithonian 294 A.B. Villaseñor 1 , F. Olóriz 2 1. Ana Bertha Villaseñor, Departamento de Paleontología, Instituto de Geología, UNAM, 04510, México, D. F. Mexico (E-mail: anab@servidor.unam.mx) 2. Federico Olóriz Departamento de Estratigrafía y Paleontología, Facultad de Ciencias, Universidad de Granada, Campus Universitario de Fuente Nueva, 18002, Granada, Spain (E-mail: foloriz@ugr.es) Mexican areas showing marine Upper Jurassic outcrops belonged to neritic shelves accommodating more or less fine terrigenous deposits and secondary carbonates during the Late Jurassic, including the Early Tithonian. The interpretation of fluctuations in relative sea level during the Late Jurassic has been proposed for long time ago in the area (e.g. Burckhardt, 1930). The Late Jurassic in Mexican epicontinental shelves was a time for their main biogeographic role as reception centers for cephalopods, as well as areas pro-moting common but variable endemism among these animals (e.g. Olóriz, 1992; Olóriz, 1992; Olóriz and Villaseñor, 2006). Fossil assemblages composed of megainverte- brates dominated by mollusks, especially ammonites and bivalves, have been usually reported together with the occurrence of wood and plants remains, and more recently obtained from the bed-by-bed sampling of Upper Jurassic sections (e.g. Burckhardt, 1930; Olóriz et al., 1999). Other groups of fossil macroinvertebrates and/or vertebrate remains are secondary, except for particular horizons (e.g. Burckhardt, 1930; Michalzik and Schumann, 1994). Factors determining skeletal accumulations, and their areal and stratigraphic distribution, as well as their preservation, have been approached taking into account eco-sedimentary conditions (e.g. Schumann, 1988; Michalzik and Schumann, 1994; Olóriz et al., 1997; De La Mora et al., 2000). Within a context of widely separate areas and highly distinct depositional conditions, ammonite records support the correlation of sedimentary packages and the assumed relative sea-level dynamics. Inter- pretations of Upper Jurassic (Lower Tithonian) deposits at the so-called third-order cycles of relative sea level are in agreement with effects of relative sea-level highs within the Lower Tithonian, Semiforme/Verruciferum Zone in the Secondary Standard for Tethyan areas (e.g. Geyssant, 1997) at both the global (e.g. Hardenbol et al., 1998) and regional levels. Consistent interpretations have been proposed for comparatively inland seas (e.g. Badenas et al., 2004 and References therein for the Iberian subplate), but the identification of local/ regional deviations forced by tectonics is widespread even within areas subdued to marine Tethyan influence (e.g. Benzzagah and Atrops, 1997; Krishna et al., 2000; and Ruban, 2007 for different ranges of deviation). Selected records of Mexican ammonites indicate Tethyan influence during the late-Early Tithonian, a time when a relative sea-level pulse favored the widespread distribution of Tethyan-derived ammonites throughout distant areas (e.g. Myczyński, 1994; Cecca, 1999; Olóriz et al., 1999; Parent, 2001; Villaseñor and Olóriz, 2001; Villaseñor et al., 2003; Ruban, 2007). Mexican records of genera Simocosmoceras, Pseudov- olanoceras and Pseudhimalayites, support biostrati- graphic correlation at the standard biochronozone level, thus favoring the possibility for long-distance correlation with the Americas and other areas subdued to Tethyan influence in Europe. Hence, Lower Tithonian deposits composed of claystone, siltstone, fine-grained and more or less calcareous sandstone, silty limestone and phosphorites belonging to the Semiforme/ Verruciferum Chron are evidenced and correlated in Mexico, and their relationships to relative sea levels discussed. In such a context, the underlying biogeo- graphical dynamics for interpreting Mexican records of Simocosmoceras, Pseudovolanoceras and Pseudhima- layites is approached. Key words: Ammonites; Correlation; Sea level; Upper Jurassic; Lower Tithonian; Mexico
Earth Science Frontiers, Vol. 17, Special Issue, Aug. 2010 ISSN 1005-2321 Fig.1 Elevations, sediment types, and biomarkers for widespread flooding on Mexican Shelves in the early Tithonian References: Bádenas B., Salas R., Aurell M. Three orders of regional sea-level changes control facies and stacking patterns of shallow platform carbonates in the Maestrat Basin (Tithonian-Berriasian, NE Spain). International Journal of Earth Sciences (Geologische Rundschau), 2004, 93: 144-162. Benzaggagh M., Atrops F. Stratigraphie et association de faune d’ammonites des zones du Kirnméridgien, Tithonien et Berriasien basal dans le Prérif interne (Rif, Maroc). Newsletters on Stratigraphy, 1997, 35(3): 127-163. Burckhardt C. Etude synthétique sur le mésozoique mexicain. Mémoires de la Societé Paléontologique Suisse, 1930, (49-50): 1-280. Cecca F. Palaeobiogeography of Tethyan ammonites during the Tithonian (latest Jurassic). Palaeogeo- graphy, Palaeoclimatology, Palaeoecology, 1999, 147: 1-37. De La Mora A., Olóriz F., González-Arreola A. Auto- chthonous bivalve assemblages and palaeoeco- logic interpretation in the Upper Jurassic - Lower- most Cretaceous La Caja Formation from the Cañón de San Matías (Zacatecas, Mexico). Com- ptes Rendus Sommaires de l' Académie des Sciencies, Paris, 2000, 331: 741-747. Geyssant G. Tithonien. In: Cariou E. Hantzpergue P. (ed). Biostratigraphie du Jurasique Ouest: Euro- péen et Méditerranéen. Zonations Parallèles et Dis- tribution des Invertébrés et Microfossiles. Groupe Français Etude Jurassique. Bulletin du Centre de Recherches Elf Exploration−Production, 1997, Mémoir 17: 98-102. Hardenbol J., Thierry J., Farley M.B., et al. Mesozoic and Cenozoic sequence chronostratigraphic chart; Jurassic Biochonostratigraphy chart. In: de Gra- ciansky P.C., Hardenbol J., Jacquin T., Vail P.R. (ed). Mesozoic and Cenozoic Sequence Strati- graphy of European Basins. SEPM Special Publi- cation, 1998, 60: 3-13, 763-782. Krishna J., Pathak D.B., Pandey B., et al. Transgressive sediment intervals in the Late Jurassic of Kachchh, India. GeoResearch Forum, 2000, 6: 321-332. Michalzik D., Schumann D. Lithofacies relations and 295
Page 4 and 5:
THE 8 TH INTERNATIONAL CONGRESS ON
Page 6 and 7:
EARTH SCIENCE FRONTIERS Short paper
Page 8 and 9:
Earth Science Frontiers, Vol. 17, S
Page 10 and 11:
Page 12 and 13:
Page 14 and 15:
Page 16 and 17:
Page 18 and 19:
Page 20 and 21:
Page 22 and 23:
Page 24 and 25:
Page 26 and 27:
Page 28 and 29:
Page 30 and 31:
Page 32 and 33:
Page 34 and 35:
Page 36 and 37:
Page 38 and 39:
Page 40 and 41:
Page 42 and 43:
Page 44 and 45:
Page 46 and 47:
Page 48 and 49:
Page 50 and 51:
Page 52 and 53:
Page 54 and 55:
Page 56 and 57:
Page 58 and 59:
Page 60 and 61:
Page 62 and 63:
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
Page 70 and 71:
Page 72 and 73:
Page 74 and 75:
Page 76 and 77:
Page 78 and 79:
Page 80 and 81:
Page 82 and 83:
Page 84 and 85:
Page 86 and 87:
Page 88 and 89:
Page 90 and 91:
Page 92 and 93:
Page 94 and 95:
Page 96 and 97:
Page 98 and 99:
Page 100 and 101:
Page 102 and 103:
Page 104 and 105:
Page 106 and 107:
Page 108 and 109:
Page 110 and 111:
Page 112 and 113:
Page 114 and 115:
Page 116 and 117:
Page 118 and 119:
Page 120 and 121:
Page 122 and 123:
Page 124 and 125:
Page 126 and 127:
Page 128 and 129:
Page 130 and 131:
Page 132 and 133:
Page 134 and 135:
Page 136 and 137:
Page 138 and 139:
Page 140 and 141:
Page 142 and 143:
Page 144 and 145:
Page 146 and 147:
Page 148 and 149:
Page 150 and 151:
Page 152 and 153:
Page 154 and 155:
Page 156 and 157:
Page 158 and 159:
Page 160 and 161:
Page 162 and 163:
Page 164 and 165:
Page 166 and 167:
Page 168 and 169:
Page 170 and 171:
Page 172 and 173:
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 192 and 193:
Page 194 and 195:
Page 196 and 197:
Page 198 and 199:
Page 200 and 201:
Page 202 and 203:
Page 204 and 205:
Page 206 and 207:
Page 208 and 209:
Page 210 and 211:
Page 212 and 213:
Page 214 and 215:
Page 216 and 217:
Page 218 and 219:
Page 220 and 221:
Page 222 and 223:
Page 224 and 225:
Page 226 and 227:
Page 228 and 229:
Page 230 and 231:
Page 232 and 233:
Page 234 and 235:
Page 236 and 237:
Page 238 and 239:
Page 240 and 241:
Page 242 and 243:
Page 244 and 245:
Page 246 and 247:
Page 248 and 249:
Page 250 and 251: Earth Science Frontiers, Vol. 17, S
Page 350 and 351:
Page 352 and 353:
Page 354 and 355:
Page 356 and 357:
Page 358 and 359:
Page 360 and 361:
Page 362 and 363:
Page 364 and 365:
Page 366 and 367:
Page 368 and 369:
Page 370 and 371:
Page 372 and 373:
Page 374 and 375:
Page 376 and 377:
Page 378 and 379:
Page 380 and 381:
Page 382 and 383:
Page 384 and 385:
Page 386 and 387:
Page 388 and 389:
Page 390 and 391:
Page 392 and 393:
Page 394 and 395:
Page 396 and 397:
Page 398 and 399:
Page 400 and 401:
Page 402 and 403:
Page 404 and 405:
Page 406 and 407:
Page 408 and 409:
Page 410 and 411:
Page 412 and 413:
Page 414 and 415:
Page 416 and 417:
410 EARTH SCIENCE FRONTIERS Short P
Page 418 and 419:
P.A. Selden 191 V.I. Katkova 309 P.
show all

in Jurassic and Cretaceous Stratigraphy

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

Delete template?

Save as template?