ZHANG Jiazheng, ZHAO Minghui, QIU Xuelin, LI Jiabiao, RUAN Aiguo. Seismic phases from the Moho and its implication on the ultraslow spreading ridge[J]. Acta Oceanologica Sinica, 2013, 32(12): 75-86. doi: 10.1007/s13131-013-0393-2
Citation: ZHANG Jiazheng, ZHAO Minghui, QIU Xuelin, LI Jiabiao, RUAN Aiguo. Seismic phases from the Moho and its implication on the ultraslow spreading ridge[J]. Acta Oceanologica Sinica, 2013, 32(12): 75-86. doi: 10.1007/s13131-013-0393-2

Seismic phases from the Moho and its implication on the ultraslow spreading ridge

doi: 10.1007/s13131-013-0393-2
  • Received Date: 2013-05-12
  • Rev Recd Date: 2013-08-20
  • The Moho interface provides critical evidence for crustal thickness and the mode of oceanic crust accretion. The seismic Moho interface has not been identified yet at the magma-rich segments (46°-52°E) of the ultra-slow spreading Southwestern Indian Ridge (SWIR). This paper firstly deduces the characteristics and domains of seismic phases based on a theoretical oceanic crust model. Then, topographic correction is carried out for the OBS record sections along Profile Y3Y4 using the latest OBS data acquired from the detailed 3D seismic survey at the SWIR in 2010. Seismic phases are identified and analyzed, especially for the reflected and refracted seismic phases from the Moho. A 2D crustal model is finally established using the ray tracing and travel-time simulation method. The presence of reflected seismic phases at Segment 28 shows that the crustal rocks have been separated from the mantle by cooling and the Moho interface has already formed at zero age. The 2D seismic velocity structure across the axis of Segment 28 indicates that detachment faults play a key role during the processes of asymmetric oceanic crust accretion.
  • loading
  • Ao Wei, Zhao Minghui, QiuXuelin, et al. 2010. The correction of shot and OBS position in the 3D seismic experiment of the SW Indian Ocean Ridge. Chinese Journal of Geophysics (in Chinese), 53(6): 1072-1081
    Barth G A, Mutter J C. 1996. Variability in oceanic crustal thickness and structure: Multichannel seismic reflection results from the northern East Pacific Rise. Journal of Geophysical Research, 101(B8): 17951-17975
    Blackman D K, Canales J P, Harding A. 2009. Geophysical signatures of oceanic core complexes. Geophysical Journal International, 178(2): 593-613
    Boudier F, Nicolas A. 1995. Nature of the Moho transition zone in the Oman ophiolite. Journal of Petrology, 36(3): 777-796
    Cann J R, Blackman D K, Smith D K, et al. 1997. Corrugated slip surfaces formed at ridge-transform intersections on the Mid-Atlantic Ridge. Nature, 385(6614): 329-332
    Cannat M, Rommevaux-Jestin C, Sauter D, et al. 1999.Formation of the axial relief at the very slow spreading Southwest Indian Ridge (49°to 69°E). Journal of Geophysical Research, 104(B10): 22825-22843
    Cannat M, Sauter D, Escartín J, et al. 2009. Oceanic corrugated surfaces and the strength of the axial lithosphere at slow spreading ridges. Earth and Planetary Science Letters, 288(1): 174-183
    Dannowski A, Grevemeyer I, Ranero C R, et al. 2010. Seismic structure of an oceanic core complex at the Mid-Atlantic Ridge, 22°19'N. Journal of Geophysical Research, 115(B7): B07106
    Davydova N I, Kosminskaya I P, Kapustian N K, et al. 1972.Models of the Earth's crust and M-boundary. Z. Geophys, 38(3): 369-393
    Escartin J, Smith D K, Cann J, et al. 2008. Central role of detachment faults in accretion of slow-spreading oceanic lithosphere. Nature, 455(7214): 790-794
    Fujiwara T, Lin J, Matsumoto T, et al. 2003. Crustal evolution of the Mid-Atlantic Ridge near the Fifteen-Twenty fracture zone in the last 5 Ma. Geochemistry Geophysics Geosystems, 4(3): 1024
    Garmany J. 1989. Accumulations of melt at the base of young oceanic crust. Nature, 340: 628-632
    Georgen J E, Lin J, Dick H J B. 2001. Evidence from gravity anomalies for interactions of the Marion and Bouvet hotspots with the Southwest Indian Ridge: Effects of transform offsets. Earth and Planetary Science Letters, 187(3): 283-300
    Hallenborg E, Harding A J, Kent G M, et al. 2003. Seismic structure of 15 Ma oceanic crust formed at an ultrafast spreading East Pacific Rise: Evidence for kilometer-scale fracturing from dipping reflectors. Journal of Geophysical Research, 108(B11): 2532
    Herron T J, Stoffa P L, Buhl P. 1980. Magma chamber and mantle reflections—East Pacific Rise. Geophysical Research Letters, 7(11): 989-992
    Jousselin D, Nicolas A. 2000. The Moho transition zone in the Oman ophiolite-relation with wehrlites in the crust and dunites in the mantle. Marine Geophysical Researches, 21(3-4): 229-241
    Kent G M, Singh S C, Harding A J, et al. 2000.Evidence from three-dimensional seismic reflectivity images for enhanced melt supply beneath mid-ocean-ridge discontinuities. Nature, 406(6796): 614-618
    Mendel V, Sauter D, Rommevaux-Jestin C, et al. 2003. Magmato-tectonic cyclicity at the ultra-slow spreading Southwest Indian Ridge: Evidence from variations of axial volcanic ridge morphology and abyssal hills pattern. Geochemistry Geophysics Geosystems, 4(5): 9102
    Miller D J, Christensen N I. 1997.Seismic velocities of lower crustal and upper mantle rocks from the slow-spreading Mid-Atlantic Ridge, south of the Kane Transform Zone (MARK).Proceedings of the Ocean Drilling Program Scientific results. Ocean Drilling Program, 153: 437-454
    Minshull T A, Muller M R, White R S. 2006. Crustal structure of the Southwest Indian Ridge at 66°E: seismic constraints. Geophysical Journal International, 166: 135-147
    Minshull T A, White R S. 1996. Thin Crust on the Flanks of the Slow‐Spreading Southwest Indian Ridge. Geophysical Journal International, 125(1): 139-148
    Muller M R, Minshull T A, White R S. 1999. Segmentation and melt supply at the Southwest Indian Ridge. Geology, 27(10): 867-870
    Muller M R, Minshull T A, White R S. 2000.Crustal structure of the Southwest Indian Ridge at the Atlantis II fracture zone. Journal of Geophysical Research, 105(B11): 25809-25828
    Muller M R, Robinson C J, Minshull T A, et al. 1997.Thin crust beneath ocean drilling program borehole 735B at the Southwest Indian Ridge? Earth and Planetary Science Letters, 148(1): 93-107
    Mutter J C, Carton H D. 2013. The mohorovicic discontinuity in ocean basins: Some observations from seismic data. Tectonophysics, doi: 10.1016/j.tecto.2013.02.018
    Mutter J C, Detrick R S. 1984. Multichannel seismic evidence for anomalously thin crust at Blake Spur fracture zone. Geology, 12(9): 534-537椼换?派敏瑫慩浮潯爠灋栬椠捍?捴潳牵敤?挠潋洬瀠汃敨硲敩獳?潩湥?瑄栠敍??楥摴??瑬氮愠渲琰椰挴?删楄摥杶敥???潭略牮湴愠汯?漠景??敡潮灩档礠獤楥捴慡汣?剭敥獮整愠牡据桤???べ??????????????????扡牴?呴畨捥栠潁汵歳整???????楁湮????????????杯敲潤污潮杣楥挮愠汇?浯潣摨敥汭?晳潴牲?琠桇敥?獰瑨特畳捩瑣畳爠敇?潯晳?牳楴摥杭敳?猠攵木洱攲温琺猠?椱渲‰猱氲漍眼?獲瀾牑敩慵摘極湥杬?潮挬攠慚湨?捯爠畍獩瑮???潩甬爠湁慯氠?潥晩??敥潴瀠桡祬献椠挲愰氱?刮攠獏敂慓爠捳桵????????????????ㄠ??????扵牲?圠桯楦琠整?剥?卓???捨?敥湳穴椠敓????佡?乩楮漠湡獮?删???????自??佣捫攬愠湓楯捵?捨爠畃獨瑩慮污?瑓桥楡挮欠湃敨獩獮?晳牥漠浊?獵敲楮獡浬椠捯?洠敇慥獯異牨敹浳敩湣瑳猠?慩湮搠?牨慩牮敥?敥愩爬琠栵?攨氱攲洩攺渠琳?椱渷瘭攳爱猲椸漍渼獢? ̄?潡畮牥湲慯氠?漠晒??敒潥灳桴祯獮椠捔愠汊?删敂獥敬慹牫捨栠????????????????????????扶牥?婯散汥瑡??????卵浳楴琠桦?割??????????卡敳楴猭浳楰捲?瑡牤慩癮敧氠瑣楥浮整?楲渠癩敮爠獴楨潥渠?晡潣物?????捇牥畯獬瑯慧汹?瘠攲氵漨挶椩琺礠?猹琹爭电挰琲甍爼敢? ̄?敥潳灴桯祮猠楔挠慊氬??潥畩牮湲慥汢??湗琬攠片湲慥瑶楥潭湥慹汥?????????????????戠牁?婲敩湦杴剥潤渠杩獮桳敩湤来?????????湡瑳牳潩摦甠捯瑮椠潴湨?琠潍?卤漭汁楴摬??慴物瑣栠?偩桤祧獥椠捡獴??椠湓??桅楡湲整獨攠????敐楬橡楮湥杴??卹挠楓散湩捥敮?健爠敌獥獴??扲牳?娠栲愰渰木″?椺愠稲栵攵渭朲??娍格慢潲 ̄?楡湵杴桥畲椠??儠楃畡塲畴敯汮椠湈??敍瑥?慤汥????ㄠ???佡?匮?猲攰椰猴洮椠捒?摤慧瑥愠?灥牧潭捥敮獴獡楴湩杯?愠湡摮?瀠牴敨汥椠浭楡湧慮牥祴?牣攠獳畴汲瑵獣?潵湲?琠桯敦?桴票摥爠潓瑯桵整牨海慥汳?映楉敮汤摩?潮映?瑩桤敧?匠漨畡瑴栠眵攰猠琳‰?湣摥椠慌湣?剥楮摣来敌???潓畣物湥慮汣?漠晌?呣牨潥灭楩捳慴汲?佇捥敯慰湨潹杳物慣灳栠祲??楥湡??桨椬渠攲猰攰?????????????????戸爲?娶栮慮潡??楯湣来桮畴楥??儮椠畇塥畯散汨楥湭???楲??楇慥扯楰慨潹??散瑳?慇汥???び?づ??刬攠猵攨愵爩挺栠?搰攵癋攰永漍瀼浢敲渾瑓?慵湴摥?瀠牄漬猠灐敡捴瑲?潡湴?瑐栬爠敒敯?摭楥浶敡湵獸椭潊湥慳汴?獮攠楃猬洠楥捴?獡瑬爮甠挲琰田爱攮猠?潨晥?獓汯潵睴?慷湥摳?甠汉瑮牤慩獡汮漠睒?獤灧牥攠慢摥楴湷来?潮挠攴愹渦?爱椷搶朻攱猵???潡畮牤渠愵氷…漣昱?吶爻潅瀺椠捆慯汣?佳捥敤愠湡潣杣牲慥灴桩祯??楡湮??桭楡湧敭獡攠?????????????n. Earth and Planetary Science Letters, 192(3): 303-317
    Seher T, Crawford W C, Singh S C, et al. 2010. Crustal velocity structure of the Lucky Strike segment of the Mid-Atlantic Ridge at 37°N from seismic refraction measurements. Journal of Geophysical Research, 115(B3): 28
    Singh S C, Harding A J, Kent G M, et al. 2006. Seismic reflection images of the Moho underlying melt sills at the East Pacific Rise. Nature, 442(7100): 287-290
    Tao Chunhui, Lin Jian, GuoShiqin, et al. 2007. Discovery of the first active hydrothermal vent field at the ultraslow spreading Southwest Indian Ridge. InterRidge News, 16: 25-26
    Tao Chunhui, Lin Jian, GuoShiqin, et al. 2012. First active hydrothermal vents on an ultraslow-spreading center: Southwest Indian Ridge. Geology, 40(1): 47-50
    Tucholke B E, Lin J, Kleinrock M C. 1998. Megamullions and mullion structure defining ocean
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索

    Article Metrics

    Article views (1133) PDF downloads(1239) Cited by()
    Proportional views
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return