LI San-zhong, LÜ Hai-qing, HOU Fang-hui, GUO Xiao-yu, JIN Chong, LIU Bao-hua. OCEANIC CORE COMPLEX[J]. Marine Geology & Quaternary Geology, 2006, 26(1): 47-52.
Citation: LI San-zhong, LÜ Hai-qing, HOU Fang-hui, GUO Xiao-yu, JIN Chong, LIU Bao-hua. OCEANIC CORE COMPLEX[J]. Marine Geology & Quaternary Geology, 2006, 26(1): 47-52.

OCEANIC CORE COMPLEX

More Information
  • Received Date: June 07, 2005
  • Revised Date: October 09, 2005
  • Oceanic core complex, a new structural type, was proposed to explain many listric detachment faults and ridge-perpendicular lineations such as megamullion in the Atlantic by comparison with the metamorphic core complex in the continent. The oceanic core complex consists of three parts based on deep seismic reflection profile. The first part is dominated by brittle deformation in layer 1 and layer 2 of the oceanic crust. The second part is brittle-ductile transition layer dominating the detachment fault. The detachment fault zone is composed of white carbonite, strongly serpentinized peridotite or basalt, ultramafic mylonite and mylonitic gabbro and others, rather than felsic mylonite and chlorinized breccia. The detachment surface is covered with thin, unmetamorphic and oceanic sediments, or directly crops out on oceanic crust. Under the detachment fault is retrograde metamorphic hot oceanic mantle. The third part is the core of oceanic core complex, which is dominated by ductile deformation intruded structurally by diapiric ultramafic plutons, especially gabbro intrusions. The oceanic core complex of the oceanic crust is obviously different from the metamorphic core complex of the continent. The oceanic core complex can result in a displacement of several kilometers along the detachment fault, producing local offsets of seafloor magnetic zones and the complexity of structural pattern in the oceanic crust.
  • [1]
    Tucholke B E, Lin J, Kleinrock M C.Megamullions and mullion structure defining oceanic metamorphic core complexes on the Mid-Atlantic Ridge[J]. Journal of Geophysical Research, 1998, 103:9857-9866.
    [2]
    Ranero C R, Reston T J.Detachment faulting at ocean core complexes[J]. Geology, 1999, 27(11):983-986.
    [4]
    李学伦.海洋地质学[M]. 青岛:青岛海洋大学,1997.[LI Xue-lun.Marine Geology[M]. Qingdao:Press of Ocean University of Qingdao, 1997.]
    [5]
    MacLeod C J, Escartin J, Banerji D, et al.Direct geological evidence for oceanic detachment faulting:The Mid-Atlantic Ridge, 15°45'N[J]. Geology, 2002, 30(10):879-882.
    [6]
    Nooner S L, Sasagawa G S, Blackman D K, et al.Structure of oceanic core complexes:Constraints from seafloor gravity measurements made at the Atlantis Massif[J]. Geophysical Research Letters, 2003, 30(8):1446.
    [7]
    Blackman D K, Karson J A, Kelley D S, et al.Geology of the Atlantis Massif (Mid-Atlantic Ridge, 30 degrees N):Implications for the evolution of an ultramafic oceanic core complex[J]. Marine Geophysical Researches, 2002, 23(5-6):443-469.
    [8]
    Reston T J,Weinrebe I, Grevemeyer E R F, et al. Participants of Meteor 47/2. A rifted inside corner massif on the Mid-Atlantic Ridge at 5°S[J]. Earth and Planetary Science Letters, 2002, 200:255-269.
    [9]
    Blackman D K, Cann J R, Janssen B, et al.Origin of extensional core complexes:evidence from the Mid-Atlantic Ridge at Atlantis fracture zone[J]. Journal of Geophysical Research B:Solid Earth, 2001,106(8):16145-16161.
    [10]
    Baines A G, Cheadle M J, Dick H J B, et al.Mechanism for generating the anomalous uplift of oceanic core complexes:Atlantis Bank, southwest Indian Ridge[J]. Geology, 2003, 31(12):1105-1108.
    [11]
    Searle R C, Cannat M, Fujioka K, et al.FUJI Dome:A large detachment fault near 64 degrees E on the very slow-spreading southwest Indian Ridge[J]. Geochemistry Geophysics Geosystems, 2003, 4:9105.
    [12]
    Gao D L, Hurst S D, Karson J A, et al.Computer-aided interpretation of side-looking sonar images from the eastern intersection of the Mid-Atlantic Ridge with the Kane Transform[J]. Journal of Geophysical Research-Solid Earth, 1998, 103(B9):20997-21014.
    [13]
    Kumagai H, Dick H J B, Kaneoka I.Noble gas signatures of abyssal gabbros and peridotites at an Indian Ocean core complex[J]. Geochemistry Geophysics Geosystems, 2003, 4:9107.
  • Related Articles

    [1]YAN Quanshu, YUAN Long, SHI Xuefa. Magmatism and tectonic evolution of the Parece Vela Basin and the drilling proposal[J]. Marine Geology & Quaternary Geology, 2022, 42(5): 103-109. DOI: 10.16562/j.cnki.0256-1492.2022062003
    [2]SUN Guohong, TIAN Liyan, LI Xiaohu, ZHANG Hanyu, CHEN Lingxuan, LIU Hongling. A review of studies on the magmatism at Southwest Indian Ridge from petrological and geochemical perspectives[J]. Marine Geology & Quaternary Geology, 2021, 41(5): 126-138. DOI: 10.16562/j.cnki.0256-1492.2021021701
    [3]HUANG Wei, TAO Chunhui, LIAO Shili, LU Jingfang, CUI Ruyong, DING Xue. Differential deposition of gold in mafic-hosted and ultramafic-hosted hydrothermal systems on the mid-ocean ridge[J]. Marine Geology & Quaternary Geology, 2020, 40(1): 126-135. DOI: 10.16562/j.cnki.0256-1492.2019060501
    [4]LIANG Yuyang, LI Jiabiao. IS THE VOLCANIC ERUPTION HIGH THE PRODUCT OF HOTSPOT AND MID-OCEAN RIDGE INTERACTION?[J]. Marine Geology & Quaternary Geology, 2015, 35(1): 71-79. DOI: 10.3724/SP.J.1140.2015.01071
    [5]DING Xue, LI Jun, ZHENG Changqing, HUANG Wei, CUI Ruyong, DOU Yanguang, SUN Zhilei. CHEMICAL COMPOSITION OF THE BASALTS ON EAST PACIFIC RISE (1.5°N~1.5°S) AND SOUTH MID-ATLANTIC RIDGE (13.2°S)[J]. Marine Geology & Quaternary Geology, 2014, 34(5): 57-66. DOI: 10.3724/SP.J.1140.2014.05057
    [6]LI Honglin, LI Jianghai, WANG Honghao, ZHANG Huatian. FORMATION MECHANISM OF OCEANIC CORE COMPLEX AND ITS SIGNIFICANCE TO THE MINERALIZATION OF HYDROTHERMAL SULFIDE[J]. Marine Geology & Quaternary Geology, 2014, 34(2): 53-59. DOI: 10.3724/SP.J.1140.2014.02053
    [7]SHAO Mingjuan, SU Xin, SHI Xuefa, YANG Yaomin, WANG Xiaofu. COMPARATIVE STUDY OF METALLOGENIC GEOLOGICAL CONDITIONS BETWEEN BASALT-HOSTED AND ULTRAMAFIC ROCK-HOSTED HYDROTHERMAL SYSTEMS ON THE MID-OCEAN RIDGE[J]. Marine Geology & Quaternary Geology, 2013, 33(6): 55-60. DOI: 10.3724/SP.J.1140.2013.06055
    [8]LI Xibing, WU Zhenli, LI Jiabiao. THE PRELIMINARY STUDY OF SEGMENTATION OF THE MID-OCEAN RIDGE IN SOUTHWEST SUB-BASIN OF THE SOUTH CHINA SEA[J]. Marine Geology & Quaternary Geology, 2013, 33(3): 101-107. DOI: 10.3724/SP.J.1140.2013.03101
    [9]ZHANG Guo-liang, ZENG Zhi-gang, YIN Xue-bo. U-SERIES DISEQUILIBRIUM ON MAGMA GENERATION AND TRANSPORTATION BENEATH MID-OCEAN RIDGE AXES[J]. Marine Geology & Quaternary Geology, 2008, 28(1): 77-84.
    [10]YAN Quan-shu, SHI Xue-fa. MANTLE PLUME(HOTSPOT)-RIDGE INTERACTION[J]. Marine Geology & Quaternary Geology, 2006, 26(5): 131-138.

Catalog

    Article views (1988) PDF downloads (24) Cited by()

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return