Knowledge

Petrology

Source 📝

407: 25: 867: 1469: 1016: 393: 1481: 1101: 1493: 90: 223: 350:) which have undergone chemical, mineralogical or textural changes due to the effects of pressure, temperature, or both). The original rock, prior to change (called the protolith), may be of any sort. 368:
that rarely survive the journey to the surface in pristine condition. They are also one of the prime sources of information about completely inaccessible rocks, such as those in the Earth's
199:, but in current usage, lithology focuses on macroscopic hand-sample or outcrop-scale description of rocks while petrography is the speciality that deals with microscopic details. 210:, is the graphic representation of geological formations being drilled through and drawn on a log called a mud log. As the cuttings are circulated out of the 360:
of natural or synthetic materials at elevated pressures and temperatures. Experiments are particularly useful for investigating rocks of the lower
380:. The work of experimental petrologists has laid a foundation on which modern understanding of igneous and metamorphic processes has been built. 732: 54: 800: 747: 323:
which consist of pieces or particles derived from other rocks or biological or chemical deposits, and are usually bound together in a
841: 160:, their mineralogy, composition, texture, structure and the conditions under which they form. Petrology has three subdivisions: 708: 672: 654: 617: 586: 530: 483: 458: 1345: 826: 241:, and chemical analysis to describe the composition and texture of rocks. Petrologists also include the principles of 1052: 793: 635: 565: 76: 120: 47: 764: 836: 846: 137: 1529: 573: 786: 751: 1123: 552: 1524: 1307: 646: 609: 598: 504: 102: 756: 1090: 851: 98: 37: 769: 214:, they are sampled, examined (typically under a 10× microscope) and tested chemically when needed. 41: 33: 226: 172:. Igneous and metamorphic petrology are commonly taught together because both make heavy use of 353: 176:, chemical methods, and phase diagrams. Sedimentary petrology is commonly taught together with 113: 58: 16:
Branch of geology that studies the formation, composition, distribution and structure of rocks
1386: 1045: 412: 963: 920: 831: 557: 365: 8: 1447: 1411: 1381: 1128: 1080: 773: 627: 373: 1519: 1401: 1340: 1292: 1218: 1179: 1110: 1085: 1075: 978: 726: 238: 203: 356:
employs high-pressure, high-temperature apparatus to investigate the geochemistry and
1497: 1391: 991: 968: 900: 714: 704: 686: 668: 664: 650: 631: 613: 582: 561: 526: 479: 454: 277: 161: 778: 1485: 1406: 1376: 1302: 1287: 1197: 1038: 856: 331: 324: 308: 181: 165: 261:
There are three branches of petrology, corresponding to the three types of rocks:
1426: 1228: 1202: 1149: 953: 943: 361: 101:
seen under the microscope, with plane-polarized light in the upper picture, and
1473: 1421: 1355: 1317: 1312: 1264: 1144: 1020: 948: 910: 890: 885: 678: 398: 357: 301: 157: 718: 1513: 1452: 1233: 1169: 1118: 935: 895: 578: 297: 250: 169: 1335: 1259: 1192: 1187: 1154: 1001: 925: 818: 698: 694: 369: 281: 242: 177: 94: 866: 222: 1416: 1282: 1238: 1223: 270: 266: 253:
data and experiments in order to better understand the origins of rocks.
207: 196: 1396: 1371: 1350: 1327: 1254: 1159: 958: 915: 905: 246: 234: 1468: 1100: 1015: 624:
Mantle Petrology: field observations and high-pressure experimentation
392: 184:. Modern sedimentary petrology is making increasing use of chemistry. 1442: 1297: 320: 312: 192: 173: 143: 126: 760: 622:
Fei, Yingwei; Bertka, Constance M.; Mysen, Bjorn O. (eds.) (1999),
425: 211: 249:
through the study of geochemical trends and cycles and the use of
1274: 1061: 996: 986: 809: 606:
Gems, Granites, and Gravels: knowing and using rocks and minerals
285: 262: 153: 330:
Metamorphic petrology focuses on the composition and texture of
307:
Sedimentary petrology focuses on the composition and texture of
229:(1906–1988), first female professor of petrography in Yugoslavia 347: 343: 339: 289: 772:- Center for International Earth Science Information Network, 748:
Atlas of Igneous and metamorphic rocks, minerals, and textures
335: 316: 293: 145: 525:(2nd ed.). New York: Prentice Hall. pp. 467–468. 377: 89: 1030: 474:
Blatt, Harvey; Tracy, Robert J.; Owens, Brent E. (2006).
420: 451:
The 22nd edition of the Manual of mineral science. Buch
571:
Blatt, Harvey; Tracy, Robert J.; Owens, Brent (2005),
105:
light in the lower picture. Scale box is 0.25 mm.
808: 604:
Dietrich, Richard Vincent; Skinner, Brian J. (2009),
763:) – Department of Earth and Environmental Sciences, 388: 273:, and another dealing with experimental techniques: 1511: 770:Petrological Database of the Ocean Floor (PetDB) 574:Petrology: igneous, sedimentary, and metamorphic 46:but its sources remain unclear because it lacks 643:Principles of Igneous and Metamorphic Petrology 523:Principles of igneous and metamorphic petrology 501:Essentials of Igneous and Metamorphic Petrology 476:Petrology: igneous, sedimentary and metamorphic 473: 180:because it deals with the processes that form 1046: 794: 692: 292:which have crystallized from molten rock or 1053: 1039: 801: 787: 731:: CS1 maint: location missing publisher ( 498: 280:focuses on the composition and texture of 77:Learn how and when to remove this message 842:Principle of cross-cutting relationships 700:An introduction to metamorphic petrology 221: 88: 195:was once approximately synonymous with 1512: 852:Principle of inclusions and components 677: 641:Philpotts, Anthony; Ague, Jay (2009), 520: 1034: 782: 661:Introduction to Ore-Forming Processes 592: 516: 514: 453:. New York: Wiley. 2002. p. 1. 18: 1492: 827:Principle of original horizontality 499:Frost, B. R.; Frost, C. D. (2014). 478:(3rd ed.). New York: Freeman. 152: 'study of') is the branch of 13: 865: 206:, lithology, or more specifically 14: 1541: 741: 553:Igneous and Metamorphic Petrology 511: 233:Petrology utilizes the fields of 1491: 1480: 1479: 1467: 1099: 1014: 765:Rensselaer Polytechnic Institute 405: 391: 372:and in the mantles of the other 23: 837:Principle of lateral continuity 847:Principle of faunal succession 757:Metamorphic Petrology Database 595:Petrology of Sedimentary Rocks 492: 467: 443: 217: 1: 431: 187: 752:University of North Carolina 436: 7: 1124:Geological history of Earth 1060: 384: 256: 10: 1546: 1097: 647:Cambridge University Press 610:Cambridge University Press 599:Cambridge University Press 543: 505:Cambridge University Press 136: 119: 1461: 1435: 1364: 1326: 1273: 1247: 1211: 1178: 1138:Composition and structure 1137: 1109: 1091:Index of geology articles 1068: 1010: 977: 934: 876: 863: 817: 703:(2 ed.). Cambridge. 296:). Igneous rocks include 133: 'rock' and 936:Geomorphologic processes 819:Stratigraphic principles 812:principles and processes 521:Winter, John D. (2010). 32:This article includes a 550:Best, Myron G. (2002), 227:Ljudmila Dolar Mantuani 61:more precise citations. 1002:Mass wasting processes 870: 750:– Geology Department, 593:Boggs, S. Jr. (2009), 354:Experimental petrology 230: 106: 1387:Environmental geology 878:Petrologic principles 869: 683:Sedimentary Petrology 413:Earth sciences portal 225: 170:sedimentary petrology 92: 1530:Oilfield terminology 1346:Planetary geophysics 964:Marine transgression 832:Law of superposition 558:Blackwell Publishing 1448:Petroleum geologist 1412:Forensic geophysics 1382:Engineering geology 1129:Timeline of geology 1081:Glossary of geology 774:Columbia University 693:Yardley, B. W. D.; 628:Geochemical Society 374:terrestrial planets 327:of finer material). 1474:Geology portal 1402:Geologic modelling 1341:Geophysical survey 1293:Geodetic astronomy 1219:Structural geology 1180:Historical geology 1111:History of geology 1086:History of geology 1076:Outline of geology 1021:Geology portal 979:Sediment transport 871: 239:optical mineralogy 231: 204:petroleum industry 107: 34:list of references 1525:Petroleum geology 1507: 1506: 1392:Planetary geology 1308:Planetary geodesy 1028: 1027: 997:Glacial processes 992:Aeolian processes 987:Fluvial processes 969:Marine regression 710:978-1-108-65955-0 687:Blackwell Science 673:978-0-632-06378-9 665:Blackwell Science 659:Robb, L. (2005). 655:978-0-521-88006-0 618:978-0-521-10722-8 587:978-0-7167-3743-8 532:978-0-321-59257-6 485:978-0-7167-3743-8 460:978-0-471-25177-4 332:metamorphic rocks 309:sedimentary rocks 278:Igneous petrology 87: 86: 79: 1537: 1495: 1494: 1483: 1482: 1472: 1471: 1407:Forensic geology 1377:Economic geology 1303:Gravity of Earth 1198:Paleoclimatology 1103: 1055: 1048: 1041: 1032: 1031: 1019: 1018: 803: 796: 789: 780: 779: 736: 730: 722: 689: 601: 537: 536: 518: 509: 508: 496: 490: 489: 471: 465: 464: 447: 415: 410: 409: 408: 401: 396: 395: 182:sedimentary rock 149: 140: 130: 123: 82: 75: 71: 68: 62: 57:this article by 48:inline citations 27: 26: 19: 1545: 1544: 1540: 1539: 1538: 1536: 1535: 1534: 1510: 1509: 1508: 1503: 1466: 1457: 1431: 1427:Mineral physics 1360: 1322: 1269: 1243: 1229:Plate tectonics 1207: 1203:Palaeogeography 1174: 1150:Crystallography 1133: 1105: 1104: 1095: 1064: 1059: 1029: 1024: 1013: 1006: 973: 954:Tectonic uplift 944:Plate tectonics 930: 872: 861: 813: 807: 744: 739: 724: 723: 711: 546: 541: 540: 533: 519: 512: 497: 493: 486: 472: 468: 461: 449: 448: 444: 439: 434: 411: 406: 404: 397: 390: 387: 358:phase relations 334:(rocks such as 311:(rocks such as 284:(rocks such as 259: 237:, petrography, 220: 190: 103:cross-polarized 83: 72: 66: 63: 52: 38:related reading 28: 24: 17: 12: 11: 5: 1543: 1533: 1532: 1527: 1522: 1505: 1504: 1502: 1501: 1489: 1477: 1462: 1459: 1458: 1456: 1455: 1450: 1445: 1439: 1437: 1433: 1432: 1430: 1429: 1424: 1422:Mining geology 1419: 1414: 1409: 1404: 1399: 1394: 1389: 1384: 1379: 1374: 1368: 1366: 1362: 1361: 1359: 1358: 1356:Tectonophysics 1353: 1348: 1343: 1338: 1332: 1330: 1324: 1323: 1321: 1320: 1318:Geopositioning 1315: 1313:Remote sensing 1310: 1305: 1300: 1295: 1290: 1285: 1279: 1277: 1271: 1270: 1268: 1267: 1265:Marine geology 1262: 1257: 1251: 1249: 1245: 1244: 1242: 1241: 1236: 1231: 1226: 1221: 1215: 1213: 1209: 1208: 1206: 1205: 1200: 1195: 1190: 1184: 1182: 1176: 1175: 1173: 1172: 1167: 1162: 1157: 1152: 1147: 1145:Cosmochemistry 1141: 1139: 1135: 1134: 1132: 1131: 1126: 1121: 1115: 1113: 1107: 1106: 1098: 1096: 1094: 1093: 1088: 1083: 1078: 1072: 1070: 1066: 1065: 1058: 1057: 1050: 1043: 1035: 1026: 1025: 1011: 1008: 1007: 1005: 1004: 999: 994: 989: 983: 981: 975: 974: 972: 971: 966: 961: 956: 951: 949:Salt tectonics 946: 940: 938: 932: 931: 929: 928: 923: 918: 913: 911:Soil formation 908: 903: 898: 893: 888: 882: 880: 874: 873: 864: 862: 860: 859: 854: 849: 844: 839: 834: 829: 823: 821: 815: 814: 806: 805: 798: 791: 783: 777: 776: 767: 754: 743: 742:External links 740: 738: 737: 709: 690: 675: 657: 639: 620: 602: 590: 569: 547: 545: 542: 539: 538: 531: 510: 491: 484: 466: 459: 441: 440: 438: 435: 433: 430: 429: 428: 423: 417: 416: 402: 399:Geology portal 386: 383: 382: 381: 351: 328: 305: 302:plutonic rocks 258: 255: 219: 216: 189: 186: 97:of a volcanic 85: 84: 42:external links 31: 29: 22: 15: 9: 6: 4: 3: 2: 1542: 1531: 1528: 1526: 1523: 1521: 1518: 1517: 1515: 1500: 1499: 1490: 1488: 1487: 1478: 1476: 1475: 1470: 1464: 1463: 1460: 1454: 1453:Volcanologist 1451: 1449: 1446: 1444: 1441: 1440: 1438: 1434: 1428: 1425: 1423: 1420: 1418: 1415: 1413: 1410: 1408: 1405: 1403: 1400: 1398: 1395: 1393: 1390: 1388: 1385: 1383: 1380: 1378: 1375: 1373: 1370: 1369: 1367: 1363: 1357: 1354: 1352: 1349: 1347: 1344: 1342: 1339: 1337: 1334: 1333: 1331: 1329: 1325: 1319: 1316: 1314: 1311: 1309: 1306: 1304: 1301: 1299: 1296: 1294: 1291: 1289: 1288:Earth's orbit 1286: 1284: 1281: 1280: 1278: 1276: 1272: 1266: 1263: 1261: 1258: 1256: 1253: 1252: 1250: 1246: 1240: 1237: 1235: 1234:Geomorphology 1232: 1230: 1227: 1225: 1222: 1220: 1217: 1216: 1214: 1212:Dynamic Earth 1210: 1204: 1201: 1199: 1196: 1194: 1191: 1189: 1186: 1185: 1183: 1181: 1177: 1171: 1170:Sedimentology 1168: 1166: 1163: 1161: 1158: 1156: 1153: 1151: 1148: 1146: 1143: 1142: 1140: 1136: 1130: 1127: 1125: 1122: 1120: 1119:Geochronology 1117: 1116: 1114: 1112: 1108: 1102: 1092: 1089: 1087: 1084: 1082: 1079: 1077: 1074: 1073: 1071: 1067: 1063: 1056: 1051: 1049: 1044: 1042: 1037: 1036: 1033: 1023: 1022: 1017: 1009: 1003: 1000: 998: 995: 993: 990: 988: 985: 984: 982: 980: 976: 970: 967: 965: 962: 960: 957: 955: 952: 950: 947: 945: 942: 941: 939: 937: 933: 927: 924: 922: 919: 917: 914: 912: 909: 907: 904: 902: 899: 897: 894: 892: 889: 887: 884: 883: 881: 879: 875: 868: 858: 857:Walther's law 855: 853: 850: 848: 845: 843: 840: 838: 835: 833: 830: 828: 825: 824: 822: 820: 816: 811: 804: 799: 797: 792: 790: 785: 784: 781: 775: 771: 768: 766: 762: 758: 755: 753: 749: 746: 745: 734: 728: 720: 716: 712: 706: 702: 701: 696: 695:Warren, Clare 691: 688: 684: 680: 679:Tucker, M. E. 676: 674: 670: 666: 662: 658: 656: 652: 648: 644: 640: 637: 636:0-941809-05-6 633: 629: 626:(Houston TX: 625: 621: 619: 615: 611: 607: 603: 600: 596: 591: 588: 584: 580: 579:W. H. Freeman 576: 575: 570: 567: 566:1-4051-0588-7 563: 559: 555: 554: 549: 548: 534: 528: 524: 517: 515: 506: 502: 495: 487: 481: 477: 470: 462: 456: 452: 446: 442: 427: 424: 422: 419: 418: 414: 403: 400: 394: 389: 379: 375: 371: 367: 363: 359: 355: 352: 349: 345: 341: 337: 333: 329: 326: 322: 318: 314: 310: 306: 303: 299: 295: 291: 287: 283: 282:igneous rocks 279: 276: 275: 274: 272: 268: 264: 254: 252: 251:thermodynamic 248: 244: 240: 236: 228: 224: 215: 213: 209: 205: 200: 198: 194: 185: 183: 179: 175: 171: 167: 163: 159: 156:that studies 155: 151: 148: 147: 139: 135: 132: 129: 122: 118: 115: 114:Ancient Greek 111: 104: 100: 96: 91: 81: 78: 70: 67:December 2008 60: 56: 50: 49: 43: 39: 35: 30: 21: 20: 1496: 1484: 1465: 1365:Applications 1336:Geomagnetism 1260:Hydrogeology 1193:Paleontology 1188:Stratigraphy 1164: 1155:Geochemistry 1012: 926:Metamorphism 877: 699: 682: 660: 642: 623: 605: 594: 572: 551: 522: 500: 494: 475: 469: 450: 445: 370:lower mantle 366:upper mantle 260: 243:geochemistry 232: 201: 191: 178:stratigraphy 144: 141: 134: 127: 124: 117: 109: 108: 95:thin section 73: 64: 53:Please help 45: 1436:Occupations 1417:Meteoritics 1283:Cartography 1239:Volcanology 1224:Geodynamics 901:Exfoliation 271:sedimentary 267:metamorphic 218:Methodology 208:mud logging 197:petrography 166:metamorphic 59:introducing 1514:Categories 1397:Geobiology 1372:Biogeology 1351:Seismology 1328:Geophysics 1255:Glaciology 1160:Mineralogy 959:Subsidence 921:Compaction 916:Diagenesis 906:Weathering 719:1226719524 432:References 247:geophysics 235:mineralogy 188:Background 112:(from 99:sand grain 1520:Petrology 1443:Geologist 1298:Geomatics 1165:Petrology 1069:Overviews 891:Extrusive 886:Intrusive 727:cite book 437:Citations 321:limestone 313:sandstone 193:Lithology 174:chemistry 110:Petrology 896:Volcanic 810:Geologic 761:MetPetDB 697:(2021). 681:(2001), 426:Pedology 385:See also 376:and the 298:volcanic 257:Branches 212:borehole 1498:Geology 1486:Geology 1275:Geodesy 1062:Geology 544:Sources 286:granite 263:igneous 202:In the 162:igneous 154:geology 55:improve 717:  707:  671:  653:  634:  616:  585:  564:  529:  482:  457:  348:schist 344:gneiss 340:marble 325:matrix 290:basalt 269:, and 168:, and 146:-logía 138:-λογία 128:pétros 121:πέτρος 1248:Water 362:crust 346:, or 336:slate 319:, or 317:shale 294:magma 158:rocks 116: 40:, or 733:link 715:OCLC 705:ISBN 669:ISBN 651:ISBN 632:ISBN 614:ISBN 583:ISBN 562:ISBN 527:ISBN 480:ISBN 455:ISBN 378:Moon 364:and 300:and 245:and 667:) 649:) 421:Ore 288:or 1516:: 729:}} 725:{{ 713:. 685:, 630:) 612:) 597:, 581:) 560:) 513:^ 503:. 342:, 338:, 315:, 265:, 164:, 93:A 44:, 36:, 1054:e 1047:t 1040:v 802:e 795:t 788:v 759:( 735:) 721:. 663:( 645:( 638:. 608:( 589:. 577:( 568:. 556:( 535:. 507:. 488:. 463:. 304:. 150:) 142:( 131:) 125:( 80:) 74:( 69:) 65:( 51:.

Index

list of references
related reading
external links
inline citations
improve
introducing
Learn how and when to remove this message

thin section
sand grain
cross-polarized
Ancient Greek
πέτρος
-λογία
-logía
geology
rocks
igneous
metamorphic
sedimentary petrology
chemistry
stratigraphy
sedimentary rock
Lithology
petrography
petroleum industry
mud logging
borehole

Ljudmila Dolar Mantuani

Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.