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Ovda Regio

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tessera terrain. During the first phase, the thrust faults and fold belts started to develop parallel to the margins. At the beginning of the first phase, these faults and folds made an impact on the tessera terrain, but later on it made an impact on the intratessera volcanic plains. On second phase, all the thrust faults and fold belts experienced a perpendicular extension. Furthermore, the last phase occurred when the extensional events continuously carried out the deformed structures from the plateau and affecting the volcanic units.
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recognition from SAR images. The folds observed in this part of the Regio are concentric, associated with plunges, and share a common axis that is trending in an east–west fashion. Another feature that is observed in this part is ribbons structures. Ribbons can be described as structures that are steep with long depression of about 1–3 km in width and shallow depths of less than 500 m. In contrast to the folding structures, the ribbons in the western part are randomly distributed.
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because the mantle underneath the lava ponds are depleted with residual melts as compared to the neighboring undepleted mantle. However, there are a few issues accompanying this model. The first issue is that scientists are not confident that meteor impacts have the capabilities to melt a significant
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and volcanic activities associated with the thin lithosphere. Planetary scientists that support this model identify two categories of extensional structures: long-narrow graben, referred to as a ribbons, and more widely spaced graben. The sequence of formation for these structures is still debatable.
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In the eastern part of Ovda, the structural setting is defined mainly by wide folds and ribbons structures. The wide folds are observed to have amplitudes up to 25 km and several hundred km in length. While the ribbons structures generally hold a radial pattern. Some of the ribbons structures on
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There are generally two different phases of structural evolution that describe the Regio's crustal plateau margins. The initial phase preceded the first phase and the last phase concluded the second phase. The initial phase was when all the material being set in place, which would then construct the
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Folds and a distinct compositional layering generally characterize the western part of Ovda Regio. Compositional layering means that the structural layers differ from each other in terms of their chemical compositions. In particular, the layers are differentiated based on their tone and textural
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chasmata to the south. The crustal plateau serves as a place to hold the localized tessera terrains in the planet, which makes up roughly 8% of Venus' surface area. The kinematic evolution of crustal plateaus on Venus has been a debated topic in the planetary science community. Understanding its
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Regionally, there are two separate phases of tectonic evolution. Initially, the Regio was at a stable state where there are no stresses acting on the crustal plateaus. This state was then followed by the first phase in which the north–south-oriented compressional stresses acted on the Regio and
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to find insight into the Regio's deformation and formation mechanisms. The challenge in this process is to find the ideal temporal and spatial relationships, which hold a prominent role in comprehending the tectonic processes. In terms of structural setting, the Regio is characterized mainly by
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portion of the planet's lithosphere and generate enough magma that would cause isostasy. The second issue is the planet's large folds need a high amount of stresses to pass the thin brittle layer, but the underlying magma is not capable of transferring enough stresses through the layer.
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stack and duplex formation on the southern margin. A more detailed analysis was conducted in this part indicate that central Ovda hosts a strike-slip tectonic regime where the deformation is accompanied by three different structures: folds, normal faults, and strike-slip faults.
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Central Ovda is distinguishable by ridges exhibiting east–west orientations similar to those of western Ovda. These ridges are common on the northern margin and often share a common axis with the fold structures. Other structural features observed in this part of Ovda are
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this part of Ovda are quite difficult to interpret due to the SAR images' limited resolution. A good number of grabens are also present in this part, although the grabens are not highly distinguishable and are limited to fold crests.
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produced an east–west folding pattern. This pattern provides the primary structural framework in Ovda Regio. Then, the second phase took place in which the compressional stresses intensified and developed significant mega
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Under the impact model, the crustal plateaus were formed by lava ponds from mantle melting due to meteor impacts to the planet's thin lithosphere. Based on this model, the crustal plateaus would be uplifted by
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This model describes that the mantle downwelling flow assisted the development of crustal thickening and shortening of the ductile crust because of compression and accretion of thin
574:"Tectonic and kinematic study of a strike-slip zone along the southern margin of Central Ovda Regio, Venus: Geodynamical implications for crustal plateaux formation and evolution" 266:
Some scientists believe that the ribbons were formed first, followed later on by the wide spaced graben. But there are other scientists who believe the reverse sequence.
142:(SAR) images from the NASA Magellan mission have been analyzed to recognize the distribution of its structural features. The distribution was then mapped to find its 358:
Kucinskas, Algis B.; Turcotte, Donald L.; Huang, Jie; Ford, Peter G. (25 August 1992). "Fractal Analysis of Venus Topography in Tinatin Planitia and Ovda Regio".
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Ghent, Rebecca; Hansen, Vicki (6 January 1999). "Structural and Kinematic Analysis of Eastern Ovda Regio, Venus: Implications for Crustal Plateau Formation".
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Hansen, Vicki L.; Willis, James J. (April 1998). "Ribbon Terrain Formation, Southwestern Fortuna Tessera, Venus: Implications for Lithosphere Evolution".
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Bindschadler, Duane L.; Schubert, Gerald; Kaula, William M. (25 August 1992). "Coldspots and hotspots: Global tectonics and mantle dynamics of Venus".
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Chetty, T.R.K.; Venkatrayudu, M.; Venkatasivappa, V. (24 May 2010). "Structural Architecture and a New Tectonic Perspective of Ovda Regio, Venus".
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There are a few ideas being continuously discussed in the planetary science community regarding the tectonic evolution of Ovda Regio:
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Romeo, I.; Capote, R. (13 June 2011). "Tectonic evolution of Ovda Regio: An example of highly deformed continental crust on Venus?".
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This 3D view depicts the border between the lowland plains on the right and the crustal plateau region of Ovda Regio on the left
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This second model describes the upwelling of a mantle flow (plume) that accommodates the formation of crustal thickening by
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There are several models that have been debated to explain crustal plateau formation in Venus, particularly in Ovda Regio:
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complex evolution is expected to contribute to a better knowledge of the geodynamic history of Venus. It is named after a
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The tectonic evolution at the crustal plateau's margins of Ovda Regio. Modified from Romeo and Capote, 2010.
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Kidder, J.G.; Phillips, R.J. (1996). "Convection-driven subsolidus crustal thickening on Venus".
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Hansen, Vicki L.; Phillips, Roger J.; Willis, James J.; Ghent, Rebecca R. (25 February 2000).
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that stretches from 10°N to 15°S and 50°E to 110°E. Known as the largest crustal plateau in
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The red rectangle shows the approximate location of Ovda Regio on the western part of
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The regional tectonic evolution at Ovda Regio. Modified from Chetty et al., 2010.
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Romeo, Ignacio; Capote, Ramon; Anguita, Francisco (10 February 2005).
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forest spirit that can appear as both male and female.
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Extensive research has been conducted to describe the
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(2003). 151:ribbons, folds, and a complex of 2191: 2182: 2181: 795:Journal of Geophysical Research 751:Journal of Geophysical Research 677:Journal of Geophysical Research 396:Mythology of All Races Volume 4 360:Journal of Geophysical Research 269: 181: 167: 158: 407: 386: 290: 49:10°N to 15°S and 50°E to 110°E 1: 516:Lunar and Planetary Institute 296:Dimensions are 6000 × 2500 km 283: 601:10.1016/j.icarus.2004.11.007 228:Marginal kinematic evolution 215:Regional kinematic evolution 57:15,000,000 square kilometres 7: 2114:Artificial objects on Venus 2109:Geological mapping of Venus 642:Planetary and Space Science 471:Planetary and Space Science 10: 2234: 507:Ghent, R.R.; Hansen, V.L. 2218:Surface features of Venus 2177: 2164:Neith (hypothetical moon) 2126: 2101: 2072: 2026: 1990: 1965: 1681: 1672: 1640: 1592: 1566: 1559: 1519: 1336: 1283: 1250: 1056: 1024: 993: 986: 950: 943: 930: 922: 662:10.1016/j.pss.2011.05.013 491:10.1016/j.pss.2010.05.010 414:McLeish, Kenneth (1996). 61: 53: 45: 37: 21: 1892:Pioneer Venus Multiprobe 1242:List of coronae on Venus 140:Synthetic aperture radar 2034:European Venus Explorer 1650:Venus-crosser asteroids 718:(E8): 13, 495–13, 532. 654:2011P&SS...59.1428R 483:2010P&SS...58.1286C 1894: / Pioneer 13 1888: / Pioneer 12 559:10.1006/icar.1998.5897 393:Holmberg, Uno (1927). 345:10.1006/icar.1999.6085 211: 203: 131: 1886:Pioneer Venus Orbiter 1207:Scalloped margin dome 1177:Quetzalpetlatl Corona 263:magmatic underplating 209: 201: 129: 816:10.1029/2006je002714 772:10.1029/1999JE001137 683:(E10): 23181–23294. 858:2003Geo....31..869I 807:2006JGRE..11111010H 763:2000JGR...105.4135H 724:1992JGR....9713495B 689:1996JGR...10123181K 593:2005Icar..175..320R 551:1998Icar..132..321H 372:1992JGR....9713635K 366:(E8): 13635–13641. 327:1999Icar..139..116G 237:Dynamic development 191:Kinematic evolution 18: 1265:Guinevere Planitia 1157:Nightingale Corona 435:Trinity University 429:Kroeger, Glenn C. 416:Dictionary of Myth 212: 204: 136:structural geology 132: 122:Structural geology 16: 2205: 2204: 2122: 2121: 2018:Venus Life Finder 1689:Sputnik programme 1668: 1667: 1555: 1554: 1052: 1051: 757:(E2): 4135–4152. 732:10.1029/92JE01165 697:10.1029/96JE02530 648:(13): 1428–1445. 477:(10): 1286–1297. 441:on 8 October 2015 431:"Exploring Earth" 380:10.1029/92JE01132 245:Downwelling model 105:to the east, and 85:located near the 72: 71: 2225: 2195: 2185: 2184: 2087:Inspiration Mars 1679: 1678: 1564: 1563: 1537:Surface features 1192:Sacajawea Patera 991: 990: 978:Mapping of Venus 948: 947: 935:Outline of Venus 917: 910: 903: 894: 893: 887: 886: 884: 882: 876:10.1130/g19669.1 869: 843: 834: 828: 827: 825: 823: 818: 792: 783: 777: 776: 774: 742: 736: 735: 707: 701: 700: 672: 666: 665: 637: 620: 619: 617: 615: 610:on 27 April 2015 609: 603:. 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Retrieved 439:the original 434: 424: 415: 409: 395: 388: 363: 359: 353: 318: 314: 292: 273: 270:Impact model 260: 248: 240: 231: 218: 194: 185: 182:Eastern Ovda 171: 168:Central Ovda 162: 159:Western Ovda 133: 103:Thetis Regio 74: 73: 54:Surface area 38:Feature type 1981:BepiColombo 1674:Exploration 1527:Geodynamics 1511:Yablochkina 1313:Dali Chasma 1237:Zisa Corona 1187:Renpet Mons 1137:Irnini Mons 1127:Iaso Tholus 1077:Akna Montes 1072:Abeona Mons 1001:Alpha Regio 968:Dune fields 614:13 February 522:13 February 399:. pp.  251:lithosphere 222:shear zones 109:as well as 46:Coordinates 2169:Phosphorus 2144:In fiction 2139:In culture 1861:Mariner 10 1787:Kosmos 482 1762:Kosmos 167 1722:Sputnik 21 1717:Sputnik 20 1712:Sputnik 19 1547:Venusquake 1542:Venus snow 1471:Merit Ptah 1406:De Lalande 1232:Ushas Mons 1227:Theia Mons 1222:Skadi Mons 1202:Sapas Mons 1132:Idunn Mons 1082:Anala Mons 1044:Lada Terra 1016:Ovda Regio 1011:Beta Regio 963:Atmosphere 284:References 75:Ovda Regio 17:Ovda Regio 2159:Mythology 2134:Cytherean 1944:MESSENGER 1854:Mariner 5 1847:Mariner 2 1840:Mariner 1 1827:Venera 16 1822:Venera 15 1817:Venera 14 1812:Venera 13 1807:Venera 12 1802:Venera 11 1797:Venera 10 1752:Kosmos 96 1737:Kosmos 27 1727:Kosmos 21 1694:Sputnik 7 1642:Asteroids 1560:Astronomy 1476:Mona Lisa 1421:Golubkina 1411:Dickinson 1391:Cleopatra 1167:Ozza Mons 1147:Maat Mons 1117:Gula Mons 1107:Fand Mons 1064:volcanoes 1058:Mountains 958:Arachnoid 944:Geography 862:CiteSeerX 331:CiteSeerX 175:imbricate 2212:Category 2187:Category 2149:Hesperus 2073:Proposed 2027:Proposed 2013:Venera-D 2003:EnVision 1974:Akatsuki 1918:Magellan 1792:Venera 9 1782:Venera 8 1777:Venera 7 1772:Venera 6 1767:Venera 5 1757:Venera 4 1747:Venera 3 1742:Venera 2 1707:Venera 1 1703:program 1594:Transits 1506:Wheatley 1496:Stefania 1441:Isabella 1436:Guilbert 1401:Danilova 1257:plateaus 1217:Sif Mons 973:Features 822:29 March 277:isostasy 144:temporal 116:Marijian 81:crustal 79:Venusian 66:Marijian 2127:Related 2089:(flyby) 2008:VERITAS 1998:DAVINCI 1991:Planned 1966:Current 1951:Shin'en 1925:Galileo 1574:Aspects 1567:General 1532:Geology 1481:Nanichi 1466:Meitner 1431:Gregory 1371:Aurelia 1366:Ariadne 1338:Craters 1290:valleys 1285:Canyons 987:Regions 951:General 881:1 March 854:Bibcode 846:Geology 803:Bibcode 759:Bibcode 720:Bibcode 685:Bibcode 650:Bibcode 589:Bibcode 547:Bibcode 479:Bibcode 445:1 March 368:Bibcode 323:Bibcode 111:Ix Chel 87:equator 83:plateau 2197:Portal 2075:crewed 2049:VISAGE 1938:IKAROS 1910:Vega 2 1905:Vega 1 1874:Zond 1 1701:Venera 1660:Zoozve 1584:Phases 1456:Mariko 1446:Jeanne 1426:Grimke 1396:Cunitz 1381:Barton 1361:Alcott 1356:Agnesi 1351:Adivar 1346:Addams 1252:Plains 1026:Terrae 864:  581:Icarus 539:Icarus 333:  315:Icarus 153:graben 107:Kuanja 62:Eponym 2102:Other 1579:Orbit 1520:Other 1501:Wanda 1486:Riley 1376:Balch 994:Regio 924:Venus 842:(PDF) 791:(PDF) 608:(PDF) 577:(PDF) 512:(PDF) 95:Venus 77:is a 41:Regio 2154:Life 2054:VICI 2044:VISE 2039:VAMP 1682:Past 1632:2012 1627:2004 1622:1882 1617:1874 1612:1769 1607:1761 1602:1639 1491:Ruth 1461:Mead 1386:Buck 883:2015 824:2015 616:2015 524:2015 447:2015 146:and 2059:VOX 1287:and 1254:and 1061:and 872:doi 811:doi 799:111 767:doi 755:105 728:doi 693:doi 681:101 658:doi 597:doi 585:175 555:doi 543:132 487:doi 401:183 376:doi 341:doi 319:139 2214:: 870:. 860:. 850:31 848:. 844:. 809:. 797:. 793:. 765:. 753:. 749:. 726:. 716:97 714:. 691:. 679:. 656:. 646:59 644:. 624:^ 595:. 583:. 579:. 553:. 541:. 514:. 499:^ 485:. 475:58 473:. 455:^ 433:. 374:. 364:97 362:. 339:. 329:. 317:. 301:^ 224:. 155:. 916:e 909:t 902:v 885:. 874:: 856:: 826:. 813:: 805:: 775:. 769:: 761:: 734:. 730:: 722:: 699:. 695:: 687:: 664:. 660:: 652:: 618:. 599:: 591:: 561:. 557:: 549:: 526:. 493:. 489:: 481:: 449:. 403:. 382:. 378:: 370:: 347:. 343:: 325:: 32:.

Index

}
Aphrodite Terra
Marijian
Venusian
plateau
equator
Aphrodite Terra
Venus
Salus Tessera
Thetis Regio
Kuanja
Ix Chel
Marijian

structural geology
Synthetic aperture radar
temporal
spatial relation
graben
imbricate


shear zones
lithosphere
magmatic underplating
isostasy



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