印度洋Carlsberg洋脊玄武岩岩石地球化学特征及其地质意义

淳明浩; 于增慧; 翟世奎

doi:10.3969/j.issn.0253-4193.2015.08.005

印度洋Carlsberg洋脊玄武岩岩石地球化学特征及其地质意义

doi: 10.3969/j.issn.0253-4193.2015.08.005

1.
中国海洋大学海洋地球科学学院海底科学与探测技术教育部重点实验室, 山东青岛 266100;中国石油集团工程技术研究院, 天津 300451
2.
中国海洋大学海洋地球科学学院海底科学与探测技术教育部重点实验室, 山东青岛 266100

基金项目: 国家重点基础研究发展计划项目(2013CB429702);中国大洋矿产资源研究开发协会"十二五"重大项目 (DY125-11-R-01,DY125-12-R-03)。

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出版历程
- 收稿日期: 2015-02-09
- 修回日期: 2015-06-19

The geochemistry and geological significances of basalts from Carlsberg Ridge in Indian Ocean

1.
The Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Ocean University of China, Qingdao 266100, China;CNPC Research Institute of Engineering Techology, Tianjin 300451, China
2.
The Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Ocean University of China, Qingdao 266100, China

摘要

摘要: 本文对采自印度洋Carlsberg脊14个站位的新鲜玄武岩样品进行了常量和微量元素组成分析,旨在研究岩浆源区地幔的性质以及岩浆作用过程。研究结果表明:该区玄武岩为典型的源于亏损型地幔的大洋中脊玄武岩,不同样品经历了不同程度的结晶分异作用,演化过程主要受控于橄榄石的结晶分异作用,部分样品中有单斜辉石结晶分异作用的影响,斜长石的结晶分异作用不显著;玄武岩岩浆来源于亏损型尖晶石二辉橄榄岩地幔的熔融,主微量元素组成中尚未见到富集型组分混入的证据;源区地幔不同比例的熔融作用及其后岩浆演化过程的差异是造成不同样品间地球化学性质差异的主要原因,彼此独立的局部岩浆作用过程是岩浆作用差异的主控制因素。Carlsberg脊玄武岩整体与全球标准大洋中脊玄武岩(N-MORB)平均组分相近,不同脊段间岩浆源区地幔的组成、熔融程度(比例)和熔融深度等无明显差异,这种特征向南直到CIR的北段。
- 印度洋 /
- Carlsberg脊 /
- 玄武岩 /
- 岩石地球化学 /
- 地幔熔融 /
- 结晶演化
Abstract: Major and ICP-MS trace element compositions have been determined for 14 fresh mid-ocean ridge basalts (MORBs) dredged from Carlsberg Ridge to investigate the nature of mantle source and magmatic process beneath this ridge. These basalts can be classified into the typical normal MORB derived from depleted mantle source and basalts with different geochemistry experienced variable degree of fractional crystallization which is mainly dominated by olivine fractionation, a few of basalts have experienced clinopyroxene fractionation and no significant plagioclase fractionation. The basaltic magma is derived from the depleted spinel lherzolite mantle melting and has no obvious major and trace element geochemical evidence suggested the enriched component mixing into the mantle source. The distinct geochemical characteristics for basalts are mainly controlled by various degree of mantle melting and the subsequently different magmatic evolution processes, and the independent magmatic process in different segments is the main dominating factor for differences of magmatism in this ridge. Major and trace element compositions of MORBs from Carlsberg Ridge are very similar to the average composition of global normal mid-ocean ridge basalt (N-MORB), there are no significant differences for compositions of mantle sources, and the average degree and depth of mantle melting among segments of Carlsberg Ridge, and this homogeneity feature continues southward to the northern section of the CIR.
- Indian Ocean /
- Carlsberg Ridge /
- basalts /
- geochemistry /
- mantle melting /
- crystallization evolution

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参考文献(52)

Klein E M,Langmuir C H. Global correlations of ocean ridge basalt chemistry with axial depth and crustal thickness[J]. Journal of Geophysical Research: Solid Earth,1987,92(B8): 8089-8115.

McKenzie D,Bickle M J. The volume and composition of melt generated by extension of the lithosphere[J]. Journal of Petrology,1988,29(3): 625-679.

Baker M B,Stolper E M. Determining the composition of high-pressure mantle melts using diamond aggregates[J]. Geochimica et Cosmochimica Acta,1994,58(13): 2811-2827.

Kushiro I,Walter M J. Mg-Fe partitioning between olivine and mafic-ultramafic melts[J]. Geophysical Research Letters,1998,25(13): 2337-2340.

Standish J J,Dick H J B,Michael P J,et al. MORB generation beneath the ultraslow spreading Southwest Indian Ridge (9-25°E): major element chemistry and the importance of process versus source[J]. Geochemistry,Geophysics,Geosystems,2008,9(5): 1-30.

Stolper E. A phase diagram for mid-ocean ridge basalts: preliminary results and implications for petrogenesis[J]. Contributions to Mineralogy and Petrology,1980,74(1): 13-27.

Ray D,Misra S,Banerjee R. Geochemical variability of MORBs along slow to intermediate spreading Carlsberg-Central Indian Ridge,Indian Ocean[J]. Journal of Asian Earth Sciences,2013,70/71: 125-141.

Niu Yaoling,Batiza R. Trace element evidence from seamounts for recycled oceanic crust in the Eastern Pacific mantle[J]. Earth and Planetary Science Letters,1997,148(3/4): 471-483.

Niu Yaoling,Regelous M,Wendt I J,et al. Geochemistry of near-EPR seamounts: importance of source vs. process and the origin of enriched mantle component[J]. Earth and Planetary Science Letters,2002,199(3/4): 327-345.

Niu Yaoling,O'Hara M J. Global correlations of ocean ridge basalt chemistry with axial depth: a new perspective[J]. Journal of Petrology,2008,49(4): 633-664.

Zhang Guoliang,Zeng Zhigang,Yin Xuebo,et al. Periodical mixing of MORB magmas near East Pacific Rise 13°N: evidence from modeling and zoned plagioclase phenocrysts[J]. Science in China Series D: Earth Sciences,2008,51(12): 1786-1801.

Niu Yanlong,Waggoner D G,Sinton J M,et al. Mantle source heterogeneity and melting processes beneath seafloor spreading centers: the East Pacific Rise,18°—19°S[J]. Journal of Geophysical Research,1996,101(B12): 27711-27733.

Mudholkar A V,Kodagali V N,KameshRaju K A,et al. Geomorphological and petrological observations along a segment of slow-spreading Carlsberg Ridge[J]. Current Science,2002,82(8): 982-989.

Banerjee R,Iyer S D. Genetic aspects of basalts from the Carlsberg Ridge[J]. Current Science,2003,85(3): 299-305.

Raju K A K,Chaubey A K,Amarnath D,et al. Morphotectonics of the Carlsberg Ridge between 62°20' and 66°20'E,northwest Indian Ocean[J]. Marine Geology,2008,252(3/4): 120-128.

Price R C,Kennedy A K,Riggs-Sneeringer M,et al. Geochemistry of basalts from the Indian Ocean triple junction: implications for the generation and evolution of Indian Ocean ridge basalts[J]. Earth and Planetary Science Letters,1986,78(4): 379-396.

Humler E,Whitechurch H. Petrology of basalts from the Central Indian Ridge (lat.25°23'S,long.70°04'E): estimates of frequencies and fractional volumes of magma injections in a two-layered reservoir[J]. Earth and Planetary Science Letters,1988,88(1/2): 169-181.

Murton B J,Tindle A G,Milton J A,et al. Heterogeneity in southern Central Indian Ridge MORB: implications for ridge-hot spot interaction[J]. Geochemistry,Geophysics,Geosystems,2005,6(3): Q03E20.

Nauret F,Abouchami W,Galer S J G,et al. Correlated trace element-Pb isotope enrichments in Indian MORB along 18°-20°S,Central Indian Ridge[J]. Earth and Planetary Science Letters,2006,245(1/2): 137-152.

Cann J R. Spilites from the Carlsberg Ridge,Indian Ocean[J]. Journal of Petrology,1969,10(1): 1-19.

Banerjee R,Iyer S D. Petrography and chemistry of basalts from the Carlsberg Ridge[J]. Journal of the Geological Society of India,1991,38: 369-386.

Iyer S D,Banerjee R. Mineral chemistry of Carlsberg Ridge basalts at 3°35'-3°41'N[J]. Geo-Marine Letters,1993,13(3): 153-158.

Hekinian R. Rocks from the mid-oceanic ridge in the Indian Ocean[J]. Deep Sea Research and Oceanographic Abstracts,1968,15(2): 195-198.

Subbarao K V,Hekinian R,Chandrasekharam D. Large ion lithophile elements and Sr and Pb isotopic variation in volcanic rocks from the Indian Ocean[M]// Heirtzler J R,ed. Indian Ocean Geology and Biostratigraphy. American Geophysical Union,1977.

Subbarao K V,Kempe D R C,Reddy V V,et al. Review of the geochemistry of Indian and other oceanic rocks[J]. Physics and Chemistry of the Earth,1979,11: 367-399.

Sempéré J-C,Klein E M. New insights in crustal accretion expected from Indian Ocean spreading centers[J]. Eos,Transactions,American Geophysical Union,1995,76(11): 113-116.

McKenzie D,Sclater J G. The evolution of the Indian Ocean since the late cretaceous[J]. Geophysical Journal International,1971,24(5): 437-528.

Ray D,Raju K A K,Baker E T,et al. Hydrothermal plumes over the Carlsberg Ridge,Indian Ocean[J]. Geochemistry,Geophysics,Geosystems,2012,13(1): 1-15.

Emslie R F. Liquidus relations and subsolidus reactions in some plagioclase-bearing systems[J]. Carnegie Inst Wash Yearbook,1970,69: 148-155.

Le Bas M J,Le Maitre R W,Streckeisen A,et al. A chemical classification of volcanic rocks based on the total alkali-silica diagram[J]. Journal of Petrology,1986,27(3): 745-750.

Niu Yaoling,Batiza R. DENSCAL: program for calculating densities of silicate melts and mantle minerals as a function of pressure,temperature,and composition in melting range[J]. Computers & Geosciences,1991,17(5): 679-687.

Niu Yaoling,Batiza R. An empirical method for calculating melt compositions produced beneath mid-ocean ridges: application for axis and off-axis (seamounts) melting[J]. Journal of Geophysical Research: Solid Earth (1978—2012),1991,96(B13): 21753-21777.

Nielsen R L,Dungan M A. Low pressure mineral-melt equilibria in natural anhydrous mafic systems[J]. Contributions to Mineralogy and Petrology,1983,84(4): 310-326.

Weaver J S,Langmuir C H. Calculation of phase equilibrium in mineral-melt systems[J]. Computers & Geosciences,1990,16(1): 1-19.

Niu Yaoling,Gilmore T,Mackie S,et al. Mineral chemistry,whole-rock compositions,and petrogenesis of Leg 176 gabbros: data and discussion[C]//Natland J H,Dick H J B,Miller D J. Proceedings of the Ocean Drilling Program,Scientific Results Volume 176,2002.

Jaques A L,Green D H. Anhydrous melting of peridotite at 0-15 Kb pressure and the genesis of tholeiitic basalts[J]. Contributions to Mineralogy and Petrology,1980,73(3): 287-310.

Villiger S,Ulmer P,Müntener O. Equilibrium and fractional crystallization experiments at 0.7 GPa; the effect of pressure on phase relations and liquid compositions of tholeiitic magmas[J]. Journal of Petrology,2007,48(1): 159-184.

Macdonald K C. A slow but restless ridge[J]. Nature,1990,384(6297): 108-109.

Sun S-S,McDonough W F. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes[J]. Geological Society,London,Special Publications,1989,42(1): 313-345.

Lonsdale P,Blum N,Puchelt H. The RRR triple junction at the southern end of the Pacific-Cocos East Pacific Rise[J]. Earth and Planetary Science Letters,1992,109(1/2): 73-85.

Kelley K A,Plank T,Ludden J,et al. Composition of altered oceanic crust at ODP Sites 801 and 1149[J]. Geochemistry,Geophysics,Geosystems,2003,4(6): 8910.

Staudigel H,Davies G R,Hart S R,et al. Large scale isotopic Sr,Nd and O isotopic anatomy of altered oceanic crust: DSDP/ODP sites417/418[J]. Earth and Planetary Science Letters,1995,130(1/4): 169-185.

Hart S R. K,Rb,Cs contents and K/Rb,K/Cs ratios of fresh and altered submarine basalts[J]. Earth and Planetary Science Letters,1969,6(4): 295-303.

Ford C E,Russell D G,Craven J A,et al. Olivine-liquid equilibria: temperature,pressure and composition dependence of the crystal/liquid cation partition coefficients for Mg,Fe²⁺,Ca and Mn[J]. Journal of Petrology,1983,24(3): 256-266.

Wilson B M. Igneous Petrogenesis A Global Tectonic Approach[M]. Netherlands: Springer,1989.

Rollinson H R. Using Geochemical Data: Evaluation,Presentation,Interpretation[M]. Routledge,2014.

Niu Yaoling,O'Hara M J. MORB mantle hosts the missing Eu (Sr,Nb,Ta and Ti) in the continental crust: new perspectives on crustal growth,crust-mantle differentiation and chemical structure of oceanic upper mantle[J]. Lithos,2009,112(1/2): 1-17.

Le Roex A P,Dick H J B,Watkins R T. Petrogenesis of anomalous K-enriched MORB from the Southwest Indian Ridge: 11°53'E to 14°38'E[J]. Contributions to Mineralogy and Petrology,1992,110(2/3): 253-268.

Standish J J. The influence of ridge geometry at the ultraslow-spreading Southwest Indian Ridge (9°-25°E): basalt composition sensitivity to variations in source and process[D]. Massachusetts: Massachusetts Institute of Technology,2006.

Gale A,Dalton C A,Langmuir C H,et al. The mean composition of ocean ridge basalts[J]. Geochemistry,Geophysics,Geosystems,2013,14(3): 489-518.

Tao Chunhui,Wu Guanghai,Deng Xianming,et al. New discovery of seafloor hydrothermal activity on the Indian Ocean Carlsberg Ridge and Southern North Atlantic Ridge-progress during the 26th Chinese COMRA cruise[J]. Acta Oceanologica Sinica,2013,32(8): 85-88.

Fournier M,Petit C,Chamot-Rooke N,et al. Do ridge-ridge-fault triple junctions exist on Earth？ Evidence from the Aden-Owen-Carlsberg junction in the NW Indian Ocean[J]. Basin Research,2008,20(4): 575-590.

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