FORMATION MECHANISM OF OCEANIC CORE COMPLEX AND ITS SIGNIFICANCE TO THE MINERALIZATION OF HYDROTHERMAL SULFIDE

LI Honglin; LI Jianghai; WANG Honghao; ZHANG Huatian

doi:10.3724/SP.J.1140.2014.02053

2014 Vol. 34, No. 2

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Article navigation > Marine Geology & Quaternary Geology > 2014 > 34(2): 53-59

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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

Citation:

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

FORMATION MECHANISM OF OCEANIC CORE COMPLEX AND ITS SIGNIFICANCE TO THE MINERALIZATION OF HYDROTHERMAL SULFIDE

School of Earth and Space Sciences, Peking University, Key Laboratory of Orogenic Belts and Crustal Evolution(MOE), Beijing 100871

Received Date: 15 November 2012

Revised Date: 08 February 2013

Abstract

Abstract

The oceanic core complex(OCC)is a new style of sea floor structure discovered in recent years. OCCs are mainly found on both sides of the slow and ultra-slow spreading ridges. Recent study of OCCs is mainly carried out on the Mid-Atlantic Ridge, Southwest Indian Ridge, Central Indian Ridge and Southeast Indian Ridge. Surface corrugations and lineations are the main features for identification of OCCs, and detachment fault parallel to ridge axis, rift valleys and normal faults on the hanging wall are all the important structures of OCC systems. Serpentinite gabbro, olivinite and the thin oceanic sediments compose OCC. The development of OCCs has much link with ocean ridge spreading velocity, manga supply and detachment fault:the manga supply at slow and ultra-slow spreading ridges is not enough to balance the ridge spreading-caused strain vacancies. There needs detachment fault on the weak zone to bring the rocks from mantle to the sea floor for balance. The development of OCCs experiences four stages including embryonic stage, development stage, maturity stage and decline stage. OCCs maybe the favorable structural setting for hydrothermal sulfide and a new off-axis hydrothermal system to provide substance, heat resource and favorable passages for the hydrothermal system and mineralization.
- oceanic complex core /
- detachment fault /
- (ultra) slow spreading ridge /
- hydrothermal sulfide /
- manga supply

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References

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