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Galápagos hotspot

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1385: 41: 29: 2007: 2031: 2019: 219:; the hotspot interacts with both plates and the spreading ridge over the last twenty million years as the relative location of the hotspot in relation to the plates has varied. Based on similar seismic velocity gradients of the lavas of the Carnegie, Cocos and Malpelos Ridges there is evidence that the hotspot activity has been the result of a single long mantle melt rather than multiple periods of activity and dormancy. 607:), characteristic of that island's lavas. It is thought that this reservoir came from subducted ocean crust that has been entrained by the mantle plume. It has enriched Sr and Pb ratios and is enriched with trace elements. FLO is associated principally with the island of Floreana and shows up on the mixing of lavas within the Galapagos along the southern side archipelago and is diluted to the east and north of there. 2043: 522:
Spreading Centre starts to rift the Malpelo Ridge away from the Carnegie Ridge. The majority of the hotspot lavas are created on the Cocos plate resulting in the formation of the Cocos Ridge. The lavas formed here are similar to the types erupted on the western shield volcanoes of the Galapagos, which are predominantly plume.
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The movement of the Nazca and Cocos plates have been tracked. The Nazca plate moves at 90 degrees at a rate of 58±2 km per million years. The Cocos Plate moves at 41 degrees at a rate of 83±3 km per million years. The location of the hotspot over time is recorded in the oceanic plate as the
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From 14.5 million years to 12.5 million years ago: the Galapagos Spreading Centre moved south and the ridge overlay the southern edge of the hotspot. Less material is erupted over the Nazca plate resulted in the saddle being formed in the Carnegie Ridge. The movement of the location of the Galapagos
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at the northern end of the ridge is only 2 million years old, and was therefore created at a time well after the ridge had moved away from the hotspot. The presence of a pronounced sedimentary hiatus in sediments on the Cocos Ridge indicates that the Cocos Ridge was probably buckled upon its initial
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The Carnegie Ridge is on the Nazca plate is 600 km (373 mi) long and up to 300 km (186 mi) wide. It is orientated parallel to the plate movement, and its eastern end is approximately 20 million years old. There is a prominent saddle in the ridge at 86 degrees West where
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3.5 million to 2 million years ago: A short-lived east–west trending spreading centre is formed north of the Galapagos Spreading Centre. This new rift fails but leads to post abandonment volcanic activity and the subsequent formation of the Cocos Island and surrounding seamounts. Around the hotspot
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The current model for the interaction of the hotspot and the spreading centre between the Cocos and Nazca plates attempts to explain the ridges on both plates; the split between the Carnegie and Malpelo Ridge and subsequent volcanic activity away from the hotspot. There have been eight major phases
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DGM – (Depleted Galapagos Mantle), this has similar characteristics to ocean ridge basalts throughout the Pacific and the Galapagos Spreading Centre. Partial melting of the upper mantle as a result of the spreading centre will leave mantle material depleted in some compounds. It has low Sr and Pb
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In Hawaii the evidence suggests that each volcano has a distinct period of activity as the hotspot moves under that portion of the Pacific plate before becoming dormant and then extinct and eroding under the ocean. This does not appear to be the case in the Galapagos, instead there is evidence of
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The hotspot is believed to be over 20 million years old and in that time there has been interaction between the hotspot, both of these plates, and the divergent plate boundary, at the Galapagos Spreading Centre. Lavas from the hotspot do not exhibit the homogeneous nature of many hotspots; instead
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PLUME – this is magma associated with the plume itself and is similar to magmas from other ocean islands within the Pacific. It has the characteristics of intermediate Strontium (Sr), Neodymium (Nd) and Lead (Pb) ratios. The PLUME lavas are found predominantly in the west of the islands, around
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proposed the "hotspot" theory to explain why although most earthquake and volcanic activity occurs at plate boundaries, some occurs far from plate boundaries. The theory claimed that small, long-lasting, exceptionally "hot" areas of magma are located under certain points on Earth. These places,
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or being relatively cool at formation in the mantle. They are then found in lower quantities in a horseshoe pattern north and south of the central islands mixing with the other reservoirs as it progresses east. PLUME lavas are also found in the lavas from the Galapagos Spreading Centre due to
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convection and mixing of all of these lavas. In the upper mantle convection currents bring in mantle material at shallow angles from the south of the Galapagos Spreading Centre. These convection current will draw in some PLUME type magma to the spreading centre where it is then erupted.
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concurrent volcanism over a wide area. Nearly all Galapagos Islands show volcanism in the recent geological past, not just at the current location of the hotspot at Fernandina. The list below gives the last eruption dates for the Galapagos volcanoes, ordered from West to East.
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Analysis of the radioactive isotopes of the lavas on the islands of the Galapagos archipelago and on the Carnegie Ridge shows that there are four major reservoirs of magma that mix in varying combinations to form the volcanic province.
196:, the magma supply is cut, and the volcano goes dormant. Meanwhile, the process repeats all over again, this time forming a new island, on and on until the hotspot collapses. The theory was developed to explain the 531:
5.2 million years ago to 3.5 million years ago: the Galapagos Spreading Centre has another ridge jump, moving northwards with the plume now erupting on the Nazca plate, similar to the present orientation.
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19.5 million years – 14.5 million years ago: the hotspot was located on the Nazca plate, forming a combined Carnegie and Malpelo Ridge. The type of lava erupted was a mix of plume material and depleted
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2.6 million years ago: a major transform fault occurs north of the Galapagos hotspot. This results in widespread volcanism in the northern Galapagos along the Wolf Darwin Lineament and around
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and the seamounts that connect them along the Wolf Darwin Lineament. It has a unique Pb ratio. WD is located along the northern side of the archipelago and dilutes to the east and south.
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that eventually rise above the ocean current, forming volcanic islands. As the islands slowly moved away from the hotspot, by the motion of sliding plates as described by the theory of
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there is evidence of four major reservoirs feeding the hotspot. These mix to varying degrees at different locations on the archipelago and also within the Galapagos Spreading Centre.
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the height drops much closer to the surrounding ocean floor. The Malpelo Ridge, which is 300 km (186 mi) long was once believed to be part of the Carnegie Ridge.
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dubbed "hotspots", provide localized heat and energy systems (thermal plumes) that sustain long-lasting volcanic activity on the surface. This volcanism builds up
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12 million years to 11 million years: The Galapagos hotspot is centred under the Galapagos Spreading Centre. plume-type lavas are now abundant on the Cocos Ridge.
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at the Galapagos Spreading Centre towards the Panamanian coast. The north eastern end of the ridge dates from about 13–14.5 million years ago. However,
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The Cocos Ridge is a 1000 km long feature located on the Cocos plate and is orientated parallel to the plates motion from the 91 degree west
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The Galapagos hotspot has a very complicated tectonic setting. It is located very close to the spreading ridge between the
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WD – (Wolf Darwin) is unique in the Pacific and resembles material from an Indian Ocean Ridge system. It is found on the
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Present : The Galapagos hotspot is south of the spreading centre and there is geochemical zonation of the plume.
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The Galápagos Islands, with a red dot over Isla Fernandina to show the approximate location of the mantle plume
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Li, Yong-Xiang; Zhao, Xixi; Jovane, Luigi; Petronotis, Katerina E.; Gong, Zheng; Xie, Siyi (1 December 2015).
583: 337: 1481: 1300: 709:"Crustal seismology helps constrain the nature of mantle melting anomalies: The Galápagos Volcanic Province" 896: 297: 232: 79: 1837: 1654: 1694: 155: 1141: 2035: 1293: 1276: 1113: 868: 568: 1885: 682: 598:. It fills in the centre of the horseshoe formed by the PLUME lavas to the west, north and south. 2023: 1927: 582:
isotope ratios and high Nd ratios. DGM is found in the central islands of the Galapagos such as
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Harpp, Karen S.; Wanless, Virginia D.; Otto, Robert H.; Hoernle, Kaj; Werner, Reinhard (2005).
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Bathymetric map of the Galápagos Islands and the effects of the hotspot on the tectonic plates
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9.5 million years ago: the rifting between the Carnegie and Malpelo Ridges ends.
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Northern Galapagos Province Hotspot Near Ridge Volcanism
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shallow subduction along the Middle American Trench.
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(8 January 2008). 134:responsible for the creation of the 1315: 657:""Hotspots": Mantle thermal plumes" 203: 13: 681:Uhlik, Caroline (8 January 2003). 636:Volcanoes of the Galápagos Islands 14: 2086: 549: 169: 2075:Geology of the Galápagos Islands 2041: 2030: 2029: 2017: 2005: 1383: 631:Caribbean large igneous province 198:Hawaiian-Emperor seamount chain 1933:South American–Antarctic Ridge 820: 648: 509:in the last 20 million years. 1: 2070:Hotspots of the Pacific Ocean 641: 972: 7: 707:Sallarès, Vallenti (2005). 624: 489:Carnegie and Cocos Ridges. 228:List of Galápagos volcanoes 10: 2091: 1886:Galápagos Spreading Center 655:Watson, Jim (5 May 1999). 173: 1999: 1951: 1836: 1753: 1480: 1392: 1381: 1323: 1269: 1246: 1178: 1150: 1122: 1089: 1056: 1008: 980: 156:Galapagos Triple Junction 78: 70: 60: 50: 38: 26: 799:10.1093/petrology/egh064 535:plume lavas predominate. 18:Pacific volcanic hotspot 1928:Pacific-Antarctic Ridge 1981:Pacific-Farallon Ridge 1953:Ancient oceanic ridges 1943:Southwest Indian Ridge 1938:Southeast Indian Ridge 1675:Philippine Mobile Belt 1271:Proposed mechanisms: 1091:Indo-Australian Plate 913:Harpp, Karen (2001). 893:"Galapagos Plumology" 1856:Central Indian Ridge 1248:South American Plate 1152:North American Plate 846:10.1002/2015GC006058 786:Journal of Petrology 558:The four types are: 398:San Cristóbal Island 1971:Kula-Farallon Ridge 255: 98: /  23: 2012:Geology portal 1986:Pacific-Kula Ridge 1976:Mid-Labrador Ridge 1901:Mid-Atlantic Ridge 1896:Juan de Fuca Ridge 734:. mantleplumes.org 711:. Mantleplumes.org 226: 180:In 1963, Canadian 21: 2057: 2056: 1871:East Pacific Rise 1283: 1282: 839:(12): 4479–4493. 685:. Stanford Report 486: 485: 368:Santa Cruz Island 176:Hotspot (geology) 136:Galápagos Islands 121:Galápagos hotspot 117: 116: 65:Galápagos Islands 22:Galápagos hotspot 2082: 2045: 2044: 2033: 2032: 2021: 2020: 2010: 2009: 1911:Kolbeinsey Ridge 1387: 1310: 1303: 1296: 1287: 1286: 967: 960: 953: 944: 943: 937: 936: 934: 932: 926: 919: 910: 901: 900: 899:on 10 June 2007. 888: 873: 865: 859: 858: 848: 824: 818: 816:Mantleplumes.org 813: 804: 803: 801: 777: 764: 762:Mantleplumes.org 759: 744: 743: 741: 739: 727: 721: 720: 718: 716: 704: 695: 694: 692: 690: 678: 672: 671: 669: 667: 652: 256: 249: 242: 235: 225: 204:Tectonic setting 113: 112: 110: 109: 108: 103: 99: 96: 95: 94: 91: 43: 31: 24: 20: 2090: 2089: 2085: 2084: 2083: 2081: 2080: 2079: 2060: 2059: 2058: 2053: 2004: 1995: 1947: 1921:Reykjanes Ridge 1906:Knipovich Ridge 1851:Carlsberg Ridge 1832: 1749: 1655:North Galápagos 1476: 1388: 1379: 1348:Indo-Australian 1319: 1317:Tectonic plates 1314: 1284: 1279: 1265: 1242: 1174: 1146: 1118: 1085: 1052: 1004: 982:Antarctic Plate 976: 971: 941: 940: 930: 928: 927:on 20 July 2011 924: 917: 911: 904: 889: 876: 866: 862: 825: 821: 814: 807: 778: 767: 760: 747: 737: 735: 728: 724: 714: 712: 705: 698: 688: 686: 679: 675: 665: 663: 653: 649: 644: 627: 569:Isabela Islands 552: 540:Genovesa Island 498:transform fault 388:Genovesa Island 378:Floreana Island 338:Santiago Island 318:Marchena Island 254: 253: 206: 194:plate tectonics 178: 172: 106: 104: 100: 97: 92: 89: 87: 85: 84: 46: 34: 19: 12: 11: 5: 2088: 2078: 2077: 2072: 2055: 2054: 2052: 2051: 2039: 2027: 2015: 2000: 1997: 1996: 1994: 1993: 1988: 1983: 1978: 1973: 1968: 1963: 1957: 1955: 1949: 1948: 1946: 1945: 1940: 1935: 1930: 1925: 1924: 1923: 1918: 1913: 1908: 1898: 1893: 1888: 1883: 1878: 1876:Explorer Ridge 1873: 1868: 1863: 1858: 1853: 1848: 1842: 1840: 1838:Oceanic ridges 1834: 1833: 1831: 1830: 1825: 1820: 1815: 1810: 1805: 1800: 1795: 1790: 1785: 1780: 1775: 1770: 1768:Bellingshausen 1765: 1759: 1757: 1755:Ancient plates 1751: 1750: 1748: 1747: 1742: 1737: 1732: 1727: 1722: 1717: 1715:South Sandwich 1712: 1710:South Bismarck 1707: 1702: 1697: 1692: 1687: 1682: 1677: 1672: 1667: 1662: 1657: 1652: 1650:North Bismarck 1647: 1642: 1637: 1632: 1627: 1622: 1617: 1612: 1607: 1602: 1597: 1592: 1590:Juan Fernández 1587: 1582: 1577: 1572: 1567: 1562: 1557: 1552: 1547: 1542: 1537: 1532: 1527: 1522: 1517: 1512: 1507: 1502: 1497: 1492: 1486: 1484: 1478: 1477: 1475: 1474: 1469: 1464: 1459: 1454: 1449: 1444: 1439: 1434: 1429: 1424: 1419: 1414: 1409: 1404: 1398: 1396: 1390: 1389: 1382: 1380: 1378: 1377: 1375:South American 1372: 1367: 1365:North American 1362: 1361: 1360: 1355: 1345: 1340: 1335: 1329: 1327: 1321: 1320: 1313: 1312: 1305: 1298: 1290: 1281: 1280: 1270: 1267: 1266: 1264: 1263: 1258: 1252: 1250: 1244: 1243: 1241: 1240: 1235: 1230: 1225: 1220: 1215: 1210: 1205: 1200: 1195: 1190: 1184: 1182: 1176: 1175: 1173: 1172: 1167: 1162: 1156: 1154: 1148: 1147: 1145: 1144: 1142:Juan Fernández 1139: 1134: 1128: 1126: 1120: 1119: 1117: 1116: 1111: 1106: 1101: 1099:East Australia 1095: 1093: 1087: 1086: 1084: 1083: 1078: 1073: 1068: 1062: 1060: 1058:Eurasian Plate 1054: 1053: 1051: 1050: 1045: 1040: 1035: 1030: 1025: 1020: 1014: 1012: 1006: 1005: 1003: 1002: 997: 992: 986: 984: 978: 977: 970: 969: 962: 955: 947: 939: 938: 902: 874: 860: 819: 805: 792:(1): 109–133. 765: 745: 722: 696: 673: 646: 645: 643: 640: 639: 638: 633: 626: 623: 622: 621: 618:Darwin Islands 609: 608: 600: 599: 578: 577: 551: 550:Lava chemistry 548: 547: 546: 543: 536: 532: 529: 526: 523: 519: 484: 483: 480: 474: 473: 470: 464: 463: 460: 454: 453: 450: 444: 443: 440: 434: 433: 430: 424: 423: 420: 414: 413: 410: 404: 403: 400: 394: 393: 390: 384: 383: 380: 374: 373: 370: 364: 363: 360: 354: 353: 350: 344: 343: 340: 334: 333: 330: 324: 323: 320: 314: 313: 310: 304: 303: 300: 294: 293: 290: 284: 283: 280: 274: 273: 270: 264: 263: 262:Last eruption 260: 252: 251: 244: 237: 229: 227: 205: 202: 185:J. 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Index

Bathymetric map of the Galápagos islands and the surrounding tectonic plates
Map of the Galápagos islands with a red dot over the mantle plume location
Ecuador
Galápagos Islands
Coordinates
0°22′S 91°33′W / 0.37°S 91.55°W / -0.37; -91.55
volcanic
hotspot
Pacific Ocean
Galápagos Islands
Carnegie
Equator
Nazca Plate
Cocos Plate
Galapagos Triple Junction
Pacific Plate
Hotspot (geology)
geophysicist
J. Tuzo Wilson
seamounts
plate tectonics
Hawaiian-Emperor seamount chain
Cocos
Nazca
plates
v
t
e
La Cumbre
Wolf

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