CHARACTERISTIC OF SUBSTRATE ROCKS OF CAIWEI SEAMOUNTS IN THE WEST PACIFIC OCEAN

WEI Zhenquan; DENG Xiguang; ZHU Kechao; YAO Huiqiang; YANG Yong; REN Jiangbo

doi:10.16028/j.1009-2722.2017.12001

2017 Vol. 33, No. 12

Article Contents

Article navigation > Marine Geology Frontiers > 2017 > 33(12): 1-6

Next Article Previous Article

WEI Zhenquan, DENG Xiguang, ZHU Kechao, YAO Huiqiang, YANG Yong, REN Jiangbo. CHARACTERISTIC OF SUBSTRATE ROCKS OF CAIWEI SEAMOUNTS IN THE WEST PACIFIC OCEAN[J]. Marine Geology Frontiers, 2017, 33(12): 1-6. doi: 10.16028/j.1009-2722.2017.12001

Citation:

WEI Zhenquan, DENG Xiguang, ZHU Kechao, YAO Huiqiang, YANG Yong, REN Jiangbo. CHARACTERISTIC OF SUBSTRATE ROCKS OF CAIWEI SEAMOUNTS IN THE WEST PACIFIC OCEAN[J]. Marine Geology Frontiers, 2017, 33(12): 1-6. doi: 10.16028/j.1009-2722.2017.12001

CHARACTERISTIC OF SUBSTRATE ROCKS OF CAIWEI SEAMOUNTS IN THE WEST PACIFIC OCEAN

Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou Marine Geological Survey, CGS, Guangzhou 510075, China

Received Date: 27 March 2017

Publish Date: 28 December 2017

Abstract

Abstract

Lithology and distribution of substrate rocks of the Caiwei Seamount are scrutinized. Results show that the substrate of the Caiwei Seamounts is mainly composed of pyroclastic rock, limestone, basalt and phosphorite. Pyroclastic rock is the most common one, and basalt and limestone are the second. Phosphorite is seldom. Microscopic examination suggests that pyroclastic rocks are dominated by basaltic volcanic breccias, and limestone is dominated by sparry bioclastic limestone or micritic bioclastic limestone. Phosphorite is mainly formed by phosphatization of bioclastic limestone or volcanic breccia. Preliminary study on geochemistry of basalts from the Caiwei Seamounts shows that the major elements contents of basalts from the Caiwei Seamounts are similar to that of Hawaii alkaline basalts. It suggests that the basalt might be formed in a tectonic environment of alkali island.
- geochemistry /
- basalt /
- substrate rock /
- Caiwei Seamounts /
- West Pacific Ocean

FullText(HTML)

References

[1]	任向文.西太平洋富钴结壳成矿系统[D].青岛:中国科学院海洋研究所,2005:64-67. Google Scholar
[2]	Epp D.Possible perturbations to hotspot traces and implications for the origin and structure of the Line Islands[J].Journal of Geophysical Research,1984,89:11273-11286. doi: 10.1029/JB089iB13p11273 CrossRef Google Scholar
[3]	Lonsdale P.Geography and history of the Louisville hotspot chain in the Southwest Pacific[J].Journal of Geophysical Research,1988,93(B4):3078-3104.doi:10.1029/JB093iB04p03078 CrossRef Google Scholar
[4]	Wessel P,Kroenke L.A geometric technique for relocating hotspots and refining absolute plate motions[J].Nature,1997,387(6631):365-369. doi: 10.1038/387365a0 CrossRef Google Scholar
[5]	Koppers A A P,Staudigel H,Pringle M S,et al.Short-lived and discontinuous intraplate volcanism in the South Pacific:Hot spots or extensional volcanism?[J].Geochemistry Geophysics Geosystems,2003,4(10):1-49. Google Scholar
[6]	Koppers A A P,Staudigel H,Wijbrans J R,et al.The Magellan seamount trail:implications for Cretaceous hotspot volcanism and absolute Pacific plate motion[J].Earth and Planetary Science Letters,1998,163(1-4):53-68. doi: 10.1016/S0012-821X(98)00175-7 CrossRef Google Scholar
[7]	何高文,赵祖斌,朱克超,等．西太平洋富钴结壳资源[M]．北京:地质出版社,2001. Google Scholar
[8]	Staudigel H,Park K H,Pringle M,et al.The longevity of the South Pacific Isotope and Thermal Anomaly[J].Earth and Planetary Science Letters,1991,102(1):24-44.doi:10.1016/0012-821X(91)90015-A CrossRef Google Scholar
[9]	Koppers A A P,Staudigel H,Christie D M,et al.Sr-Nd-Pb Isotope Geochemistry of Leg 144 West Pacific guyots:implications for the geochemical evolution of the ‘SOPITA’ mantle anomaly[C]// Haggerty J A,Premoli Silva I,Rack F,et al.Proc.ODP Leg 144,1995:535-545. Google Scholar
[10]	Koppers A A P.⁴⁰Ar/³⁹Ar geochronology and isotope geochemistry of the West Pacific seamount province:implications for Pacific plate motion and chemical geodynamics[D].Amsterdam:Vrije Universiteit Amsterdam,1998:263. Google Scholar
[11]	陈建林,马维林,武光海,等.中太平洋海山富钴结壳与基岩关系的研究[J].海洋学报,2004,26(4):71-79. doi: 10.3321/j.issn:0253-4193.2004.04.008 CrossRef Google Scholar
[12]	Basaltic Volcanism Study Project.Basaltic volcanism on the terrestial planets[M].New York:Progamon Press,1981:1286. Google Scholar
[13]	Wilson M.Igneous Petrogenesis[M].London:Unwin Hyman,1989:21-22. Google Scholar
[14]	王春生,马维林,李振韶,等.DY115-17B航次报告[R].2008. Google Scholar
[15]	初凤友,李振韶,武光海,等.DY115-18航次报告[R].2008. Google Scholar
[16]	马维林,李振韶,倪建宇,等.DY115-19航次报告[R].2009. Google Scholar
[17]	Winchester J A,Floyd P A.Geochemical discrimination of different magma series and their differentiation products using immobile elements[J].Chemical Geology,1977,20(C):325-343. Google Scholar
[18]	Pearce J A.Role of the sub-continental lithosphere in magma genesis at active continental margins[M]//Hawkesworth C J,Norry M J.Continental Basalts and Mantle Xenoliths.Nantwish:Shiva,1983:230-249. Google Scholar
[19]	Sun S S,McDonough W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[C]// Saunders A D,Norry M J.Magmatism in Ocean Basins.Londn:Geol.Soc.Spec.Publ.,1989:313-345. Google Scholar
[20]	Wood D A.The application of a Th-Hf-Ta diagram to problems of tectonomagmatic classification and to establishing the nature of crustal contamination of basaltic lavas of the British Tertiary volcanic province[J].Earth and Planetary Science Letters,1980, 50:11-30. doi: 10.1016/0012-821X(80)90116-8 CrossRef Google Scholar