Geochemistry and petrogenesis of Quaternary volcanism from the islets in the eastern Beibu Gulf: evidence for Hainan plum
doi: 10.1007/s13131-013-0386-1
Geochemistry and petrogenesis of Quaternary volcanism from the islets in the eastern Beibu Gulf: evidence for Hainan plum
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摘要: Some of the islets in the eastern Beibu Gulf are covered by Quaternary volcano strata. The rock samples from these islets mainly consist of quartz tholeiites (at Shenjiandao), olivine tholeiites (at Linshidao and Xieyangdao) and alkali basalts (at Yangpubi and Jianshidao), and basically represent four periods of the Quaternary volcanism of Hainan Island and its adjacent regions. Except for the samples from Shenjiandao, most of the Quaternary volcanics of these islets belong to alkali magma series. The trace element characteristics of all of these samples show they are OIB (oceanic island basalt) -like, which implies that their deep geodynamic setting may be related to a mantle plume. The Sr-Nd-Pb isotopic compositions show that the mantle source beneath the Quaternary strata can be regarded as a result of binary mixing between a depleted, DMM (depleted MORB mantle)-like source and an enriched mantle type 2 (EM2). The EM2 may be originated from the Hainan mantle plume, and has been metasomatized by carbonaceous fluids released from ancient recycled oceanic crust at an asthenospheric mantle level. These features, together with typical trace element ratios, reflect that the parent magma was not subjected to crustal contamination during its ascent to the surface. This study provides further petrological and geochemical evidence for the existence of the Hainan mantle plume.Abstract: Some of the islets in the eastern Beibu Gulf are covered by Quaternary volcano strata. The rock samples from these islets mainly consist of quartz tholeiites (at Shenjiandao), olivine tholeiites (at Linshidao and Xieyangdao) and alkali basalts (at Yangpubi and Jianshidao), and basically represent four periods of the Quaternary volcanism of Hainan Island and its adjacent regions. Except for the samples from Shenjiandao, most of the Quaternary volcanics of these islets belong to alkali magma series. The trace element characteristics of all of these samples show they are OIB (oceanic island basalt) -like, which implies that their deep geodynamic setting may be related to a mantle plume. The Sr-Nd-Pb isotopic compositions show that the mantle source beneath the Quaternary strata can be regarded as a result of binary mixing between a depleted, DMM (depleted MORB mantle)-like source and an enriched mantle type 2 (EM2). The EM2 may be originated from the Hainan mantle plume, and has been metasomatized by carbonaceous fluids released from ancient recycled oceanic crust at an asthenospheric mantle level. These features, together with typical trace element ratios, reflect that the parent magma was not subjected to crustal contamination during its ascent to the surface. This study provides further petrological and geochemical evidence for the existence of the Hainan mantle plume.
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Cande S C, Kent D V. 1995. Revised calibration of the geomagnetic polarity timescale for the Late Cretaceous and Cenozoic. J Geophys Res, 98: 6299-6328 Castillo P. 1988. The Dupal anomaly as a trace of the upwelling lower mantle. Nature, 336: 667-670 Chazot G. 2005. Lithospheric Mantle Evolution during continental break-up: the West Iberia non-volcanic passive margin. Journal of Petrology, 46(12): 2527-2568 Chen Lihui, Zeng Gang, Hu Senlin, et al. 2012. Crustal recycling and genesis of continental Alkaline basalts: case study of the Cenozoic alkaline basalts from Shandong Province, eastern China (in Chinese). Geological Journal of China Universities, 18(1): 16-27 Clift P, Lin J, Barckhausen U. 2002. Evidence of low flexural rigidity and low viscosity lower continental crust during continental break-up in the South China Sea. Marine and Petroleum Geology, 19: 951-970 Dasgupta R, Hirschmann M M, Smith N D. 2007. Partial melting experiments of peridotitie+CO2 at 3 GPa and genesis of alkalic ocean island basalts. Journal of Petrology, 48: 2093-2124 Fan Qicheng, Sun Qian, Sui Jianli, et al. 2008. Trace-element and isotopic geochemistry of volcanic rocks and its tectonic implications in Weizhou Island and Xieyang Island, Northern Bay (in Chinese). ActaPetrologicaSinica, 24(6): 1323-1332 Flower M F, Zhang M, Chen C Y, et al. 1992. Magmatism in the South China Basin 2.Post-spreading Quaternary basalts from Hainan Island, south China. Chemical Geology, 97: 65-87 Halliday A N, Lee D C, Tommasini S, et al. 1995. Incompatible trace elements in OIB and MORB and source enrichment in the sub-oceanic mantle. Earth Planet SciLett, 133: 379-395 Hamelin B, Allègre C J. 1985. Large scale regional units in the depleted upper mantle revealed by an isotopic study of the south-west Indian ridge. Nature, 315: 196-199 Hart S R. 1984.A large-scale isotope anomaly in the Southern Hemisphere mantle. Nature, 309: 753-757 Hirose K. 1997. Partial melt compositions of carbonated peridotite at 3 GPa and role of CO2 in alkali-basalt magma generation. Geophysical Research Letters, 24: 2837-2840 Hoang N, Flower M, Carlson R W. 1996. Major, trace element, and isotopic compositions of Vietnamese basalts: interaction of hydrous EM1-rich asthenosphere with thinned Eurasian lithosphere. GeochimicaetCosmochimicaActa, 60(22): 4329- 4351 Hofmann A W. 1988. Chemical differentiation of the Earth: the relationship between mantle, continental crust and oceanic crust. Earth Planet SciLett, 90: 297-314 Hofmann A W. 1997. Mantle geochemistry—the message from oceanic volcanism. Nature, 385: 219-229 Irvine T N, Baragar W R A. 1971. A guide to the chemical classification of the common volcanic rocks. Can J Earth Sci, 8: 523-548 Janney P E, Castillo P R. 1996. Basalts from the Central Pacific Basin: Evidence for the origin of Cretaceous igneous complexes in the Jurassic western Pacific. Journal of Geophysical Research, 101(B2): 2875-2893 Jia Dacheng, Qiu Xuelin, Hu Ruizhong, et al. 2003. Geochemical nature of mantle reservoirs and tectonic setting of basalts in Beibu Gulf and its adjacent region (in Chinese). Journal of Tropical Oceanography, 22(2): 30-39 Le Maitre R W. 1989. A Classification of Igneous Rocks and Glossary of Terms. Oxford: Blackwell, 193 Lebedev S, Chevrot S, Nolet G, et al. 2000. New seismic evidence for a deep mantle origin of the S. China basalts (the Hainan Plume?) and other observations in SE Asia. Eos Trans. AGU, 81 (48), Fall Meeting Supplement Lebedev S, Nolet G. 2003. Upper mantle beneath Southeast Asia from S velocity tomography. Journal of Geophysical Research, 108: 2048, doi: 10.1029/2000JB000073 Lei Jianshe, Zhao Dapeng. 2009. New seismic constraints on the upper mantle structure of the Hainan plume. Physics of the Earth and Planetary Interiors, 173: 33-50 Li Changnian, Wang Fangzheng, ZhongChengsheng. 2005. Geochemistry of Quaternary basaltic volcanic rocks of Weizhou island in Beihai City of Guangxi and a discussion on characteristics of their source (in Chinese). Acta Petrologia et Mineralogia, 24(1): 1-11 Li Sitian, Lin Changsong, Zhang Q, et al. 1999. Dynamic process of episodic rifting in continental marginal basin and tectonic events since 10 Ma in South China Sea. Chinese Science Bulletin, 41(1): 10-23 Lugmair G W, Galer S J. 1992. Age and isotopic relationships among the angerites Lewis Cliff 86010 and Angra dos Reis.Geochimica et Cosmochimica Acta, 56: 1673-1694 Maruyama S. 1994. Plume tectonics. The Geological Society of Japan, 100(1): 24-29 Montelli R, Nolet G, Dahlen F A, et al. 2006. A catalogue of deep mantle plumes: New results from finitefrequency tomography. GeochemGeophysGeosyst, 7(1): 1-69 NiuYaoling, O'Hara M J. 2003. Origin of ocean island basalts: A new perspective from petrology, geochemistry, and mineral physics considerations. J Geophys Res, 108(B4): 5-19 Pearce J A, Cann J R. 1973. Tectonic setting of basic volcanic rocks determined using trace element analysis. Earth Planet SciLett, 19: 290-300 Pearce J A, Norry M J. 1979. Petrogenetic implications of Ti, Zr, Y, and Nb. Variations in volcanic rocks. Contributions to Mineralogy and Petrology, 69: 33-37 Shi Xuefa, Yan Quanshu. 2011. Geochemistry of Cenozoic magmatism in the South China Sea and its tectonic implications. Marine Geology & Quaternary Geology (in Chinese), 31(2): 59-72 Staudigel P, Zindler A, Hart S R, et al. 1984. The isotope systematics of a juvenile intra-plate volcano: Pb, Nd and Sr isotope ratios of basalts from loihi Seamount, Hawaii. Earth Planet.SciLett, 69: 13-29 Sun S S, McDonough W F. 1989. Chemical and isotopic systemtics of oceanic basalts: Implications of mantle composition and processes. Geological Society, London, Special Publications, 42: 313-345 Taylor S R, McLennan S M. 1985. The Continental Crust: Its Composition and Evolution. Oxford: Blackwell Tu K, Flower M F J, Carlson R W, et al. 1991. Sr, Nd, and Pb isotopic compositions of Hainan basalts (south China): implications for a subcontinental lithosphere Dupal source. Geology, 19: 567-569 Tu K, Flower F J, Carlson R W, et al. 1992. Magmatism in the South China Basin 1.Isotopic and trace-element evidence for an endogenous Dupal mantle component.Chem Geol, 97(1-2): 47-63 Wang Xuance, Li Zhengxiang, Li Xianhua, et al. 2012. Temperature, pressure, and composition of the mantle source region of late Cenozoic basalts in Hainan Island, SE Asia: a consequence of a young thermal mantle plume close to subduction zones? Journal of Petrology, 53: 177-233 Wang Yunliang, Zhang Chengjiang, XiuShuzhi. 2001. Th/Hf - Ta/Hf identification of tectonic setting of basalts. ActaPetrologicaSinica (in Chinese), 17(3): 413-421 White W M. 1985. The sources of ocean basalts: radiogenic isotopic evidence. Geology, 13: 115-118 White W M. 2010. Oceanic Island Basalts and Mantle Plumes: the geochemical perspective. Annu Rev Earth Planet Sci, 38: 133-160 Willbold M, Stracke A. 2010. Formation of enriched mantle components by recycling of upper and lower continental crust. Chemical Geology, 276: 188-197 Xia Kanyuan, Huang Ciliu Jiang Shaoren, et al. 1994. Comparison of the tectonics and geophysics of the major structural belts between the northern and southern continental margins of the South China Sea. Tectonophysics, 235(1-2): 99-116 Yan Quanshu, Shi Xuefa. 2007. Hainan plume and the formation and evolution of the South China Sea. Geological Journal of China Universities (in Chinese), 27(2): 311-322 Yan Quanshu, Shi Xuefa, Wang Kunshan, et al. 2008a. Major element, trace element, Sr-Nd-Pb isotopic studies of Cenozoic alkali basalts from the South China Sea. Science in China (Series D), 51(4): 550-566 Yan Quanshu, Shi Xuefa, Yang Yaomin, et al. 2008b. K-Ar/Ar-Ar Geochronology of Cenozoic alkali basalts from the South China Sea.Acta Oceanologica Sinica, 27(6): 115-123 Yan Quanshu, Shi Xuefa, Li Naisheng. 2011. Oxygen and lead isotope characteristics of granitic rocks from the Nansha block (South China Sea): Implications for their petrogenesis and tectonic affinity. Island Arc, 20: 150-159 Zeng Weijun, Li Zhenwu, Wu Nengyou, et al. 1997. The upper mantle activation of South China Sea and the Indosinian mantle plume (in Chinese). Geological research of South China Sea, 9: 1-19 Zhao Dapeng. 2007. Seismic images under 60 hotspots: Search for mantle plumes. Gondwana Research, 12: 335-355 Zhou Pinbo, Mukasa S B. 1997. Nb-Sr-Pbisotopic, and major- and trace-element geochemistry of Cenozoic lavas from the Khorat Plateau, Thailand: sources and petrogenesis. Chemical Geology, 137: 175-193 Zhu Bingquan, Wang Huifang. 1989. Nd-Sr-Pb isotopic evidence for MORB-OIB transitional type mantle-source volcanism in Leiqiong region. Geochimica, 3: 193-201 Zindler A, Hart S R. 1986. Chemical geodynamics.Annu Rev Earth Planet SciLett, 14: 493-571 ZouHaibo, Fan Qicheng. 2010. U-Th isotopes in Hainan basalts: Implications for sub-asthenospheric origin of EM2 mantle endmember and the dynamics of melting beneath Hainan Island. Lithos, 116: 145-152
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