Chemical composition and petrogenesis of plagioclases in plagioclase-phyric basalts from the Southwest Indian Ridge (51°E)

Jie Li; Jihao Zhu; Fengyou Chu; Xiaohu Li; Zhimin Zhu; Hao Wang

doi:10.1007/s13131-020-1613-1

Volume 39 Issue 7

Jul. 2020

Turn off MathJax

Article Contents

Article Navigation > Acta Oceanologica Sinica > 2020 > 39(7): 42-49

Jie Li, Jihao Zhu, Fengyou Chu, Xiaohu Li, Zhimin Zhu, Hao Wang. Chemical composition and petrogenesis of plagioclases in plagioclase-phyric basalts from the Southwest Indian Ridge (51°E)[J]. Acta Oceanologica Sinica, 2020, 39(7): 42-49. doi: 10.1007/s13131-020-1613-1

Citation:

Jie Li, Jihao Zhu, Fengyou Chu, Xiaohu Li, Zhimin Zhu, Hao Wang. Chemical composition and petrogenesis of plagioclases in plagioclase-phyric basalts from the Southwest Indian Ridge (51°E)[J]. Acta Oceanologica Sinica, 2020, 39(7): 42-49. doi: 10.1007/s13131-020-1613-1

Citation:

Jie Li, Jihao Zhu, Fengyou Chu, Xiaohu Li, Zhimin Zhu, Hao Wang. Chemical composition and petrogenesis of plagioclases in plagioclase-phyric basalts from the Southwest Indian Ridge (51°E)[J]. Acta Oceanologica Sinica, 2020, 39(7): 42-49. doi: 10.1007/s13131-020-1613-1

PDF( 778 KB)

Chemical composition and petrogenesis of plagioclases in plagioclase-phyric basalts from the Southwest Indian Ridge (51°E)

doi: 10.1007/s13131-020-1613-1

Jie Li^{1, 2
,
,},
Jihao Zhu^{1, 2},
Fengyou Chu^{1, 2},
Xiaohu Li^{1, 2},
Zhimin Zhu^{1, 2},
Hao Wang^{1, 2}

1.
Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, China
2.
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China

Funds: The National Natural Science Foundation of China under contract Nos 41606041 and 41903046; the Scientific Research Fund of the Second Institute of Oceanography, MNR under contract Nos JG1604 and JT1504; China Ocean Mineral R&D Association (COMRA) Project under contract Nos DY135-G2-1-03 and DY135-N2-1-04.

More Information

Corresponding author: E-mail: lijie@sio.org.cn
Received Date: 2019-12-15
Accepted Date: 2020-02-25

Available Online: 2020-12-28

Publish Date: 2020-07-25

Abstract

Abstract

Electron microprobe analysis was conducted on plagioclase from the plagioclase ultraphyric basalts (PUBs) erupted on the Southwest Indian Ridge (SWIR) (51°E) to investigate the geochemical changes in order to better understand the magmatic processes occurring under ultraslow spreading ridges and to provide insights into the thermal and dynamic regimes of the magmatic reservoirs and conduit systems. The phenocryst cores are generally calcic (An_74–82) and are depleted in FeO and MgO. Whereas the phenocryst rims (An_67–71) and the plagioclase in the groundmass (An_58–63) are more sodic and have higher FeO and MgO contents than the phenocryst cores. The crystallization temperatures of the phenocryst cores and the calculation of the equilibrium between the phenocrysts and the matrix suggest that the plagioclase cores are unlikely to have crystallized from the host basaltic melt, but are likely to have crystallized from a more calcic melt. The enrichment in incompatible elements (FeO and MgO), as well as the higher FeO/MgO ratios of the outermost phenocryst rims and the groundmass, are the result of plagioclase-melt disequilibrium diffusion during the short residence time in which the plagioclase crystallized. Our results indicate that an evolved melt replenishing under the SWIR (51°E) drives the eruption over a short period of time.
- plagioclase–phyric basalt,
- plagioclase phenocrysts,
- magmatic evolution,
- SWIR

FullText(HTML)

References(42)

References

[1]	Bennett E N, Lissenberg C J, Cashman K V. 2019. The significance of plagioclase textures in mid-ocean ridge basalt (Gakkel Ridge, Arctic Ocean). Contributions to Mineralogy and Petrology, 174(6): 49. doi: 10.1007/s00410-019-1587-1
[2]	Bézos A, Humler E. 2005. The Fe³⁺/ΣFe ratios of MORB glasses and their implications for mantle melting. Geochimica et Cosmochimica Acta, 69(3): 711–725. doi: 10.1016/j.gca.2004.07.026
[3]	Bindeman I N, Davis A M, Drake M J. 1998. Ion microprobe study of plagioclase-basalt partition experiments at natural concentration levels of trace elements. Geochimica et Cosmochimica Acta, 62(7): 1175–1193. doi: 10.1016/S0016-7037(98)00047-7
[4]	Cannat M, Sauter D, Bezos A, et al. 2008. Spreading rate, spreading obliquity, and melt supply at the ultraslow spreading Southwest Indian Ridge. Geochemistry, Geophysics, Geosystems, 9(4): Q04002. doi: 10.1029/2007GC001676
[5]	Chen Xiaoming, Tan Qingquan, Zhao Guangtao. 2002. Plagioclases from the basalt of Okinawa Trough and its petrogenesis significance. Acta Petrologica Sinica (in Chinese), 18(4): 482–488
[6]	Coogan L A, MacLeod C J, Dick H J B, et al. 2001. Whole-rock geochemistry of gabbros from the Southwest Indian Ridge: constraints on geochemical fractionations between the upper and lower oceanic crust and magma chamber processes at (very) slow-spreading ridges. Chemical Geology, 178(1−4): 1–22. doi: 10.1016/S0009-2541(00)00424-1
[7]	Coote A C, Shane P. 2016. Crystal origins and magmatic system beneath Ngauruhoe volcano (New Zealand) revealed by plagioclase textures and compositions. Lithos, 260: 107–119. doi: 10.1016/j.lithos.2016.05.017
[8]	Coote A, Shane P, Stirling C, et al. 2018. The origin of plagioclase phenocrysts in basalts from continental monogenetic volcanoes of the Kaikohe-Bay of Islands field, New Zealand: implications for magmatic assembly and ascent. Contributions to Mineralogy and Petrology, 173(2): 14. doi: 10.1007/s00410-018-1440-y
[9]	Costa F, Chakraborty S, Dohmen R. 2003. Diffusion coupling between trace and major elements and a model for calculation of magma residence times using plagioclase. Geochimica et Cosmochimica Acta, 67(12): 2189–2200. doi: 10.1016/S0016-7037(02)01345-5
[10]	Costa F, Coogan L A, Chakraborty S. 2010. The time scales of magma mixing and mingling involving primitive melts and melt-mush interaction at mid-ocean ridges. Contributions to Mineralogy and Petrology, 159(3): 371–387. doi: 10.1007/s00410-009-0432-3
[11]	Cullen A, Vicenzi E, McBirney A R. 1989. Plagioclase-ultraphyric basalts of the Galapagos Archipelago. Journal of Volcanology and Geothermal Research, 37(3−4): 325–337. doi: 10.1016/0377-0273(89)90087-5
[12]	Dick H J B. 1989. Abyssal peridotites, very slow spreading ridges and ocean ridge magmatism. In: Saunders A D, Norry M J, eds. Magmatism in the Ocean Basins. Geological Society, London, Special Publications, 42: 71–105. doi: 10.1144/GSL.SP.1989.042.01.06
[13]	Dick H J B, Lin Jian, Schouten H. 2003. An ultraslow-spreading class of ocean ridge. Nature, 426(6965): 405–412. doi: 10.1038/nature02128
[14]	Drignon M J, Nielsen R L, Tepley III F J, et al. 2019. Upper mantle origin of plagioclase megacrysts from plagioclase-ultraphyric mid-oceanic ridge basalt. Geology, 47(1): 43–46. doi: 10.1130/G45542.1
[15]	Georgen J E, Lin Jian, Dick H J B. 2001. Evidence from gravity anomalies for interactions of the Marion and Bouvet hotspots with the Southwest Indian Ridge: effects of transform offsets. Earth and Planetary Science Letters, 187(3−4): 283–300. doi: 10.1016/S0012-821X(01)00293-X
[16]	Ginibre C, Wörner G, Kronz A. 2002. Minor-and trace-element zoning in plagioclase: implications for magma chamber processes at Parinacota volcano, northern Chile. Contributions to Mineralogy and Petrology, 143(3): 300–315. doi: 10.1007/s00410-002-0351-z
[17]	Ginibre C, Wörner G, Kronz A. 2004. Structure and dynamics of the laacher see magma chamber (Eifel, Germany) from major and trace element zoning in sanidine: a cathodoluminescence and electron microprobe study. Journal of Petrology, 45(11): 2197–2223. doi: 10.1093/petrology/egh053
[18]	Grove T L, Baker M B, Kinzler R J. 1984. Coupled CaAl-NaSi diffusion in plagioclase feldspar: experiments and applications to cooling rate speedometry. Geochimica et Cosmochimica Acta, 48(10): 2113–2121. doi: 10.1016/0016-7037(84)90391-0
[19]	Hellevang B, Pedersen R B. 2008. Magma ascent and crustal accretion at ultraslow-spreading ridges: constraints from plagioclase ultraphyric basalts from the arctic mid-ocean ridge. Journal of Petrology, 49(2): 267–294
[20]	Jian Hanchao, Singh S C, Chen Y J, et al. 2017. Evidence of an axial magma chamber beneath the ultraslow-spreading Southwest Indian Ridge. Geology, 45(2): 143–146. doi: 10.1130/G38356.1
[21]	Kamenetsky V S, Everard J L, Crawford A J, et al. 2000. Enriched end-member of primitive MORB melts: petrology and geochemistry of glasses from Macquarie Island (SW Pacific). Journal of Petrology, 41(3): 411–430. doi: 10.1093/petrology/41.3.411
[22]	Kudo A M, Weill D F. 1970. An igneous plagioclase thermometer. Contributions to Mineralogy and Petrology, 25(1): 52–65. doi: 10.1007/BF00383062
[23]	Landi P, Métrich N, Bertagnini A, et al. 2004. Dynamics of magma mixing and degassing recorded in plagioclase at Stromboli (Aeolian Archipelago, Italy). Contributions to Mineralogy and Petrology, 147(2): 213–227. doi: 10.1007/s00410-004-0555-5
[24]	Lange A E, Nielsen R L, Tepley III F J, et al. 2013. The petrogenesis of plagioclase-phyric basalts at mid-ocean ridges. Geochemistry, Geophysics, Geosystems, 14(8): 3282–3296. doi: 10.1002/ggge.20207
[25]	Martel C, Radadi Ali A, Poussineau S, et al. 2006. Basalt-inherited microlites in silicic magmas: evidence from Mount Pelée (Martinique, French West Indies). Geology, 34(11): 905–908. doi: 10.1130/G22672A.1
[26]	Martel C, Schmidt B C. 2003. Decompression experiments as an insight into ascent rates of silicic magmas. Contributions to Mineralogy and Petrology, 144(4): 397–415. doi: 10.1007/s00410-002-0404-3
[27]	Mollo S, Putirka K, Iezzi G, et al. 2011. Plagioclase-melt (dis)equilibrium due to cooling dynamics: implications for thermometry, barometry and hygrometry. Lithos, 125(1−2): 221–235. doi: 10.1016/j.lithos.2011.02.008
[28]	Moore A, Coogan L A, Costa F, et al. 2014. Primitive melt replenishment and crystal-mush disaggregation in the weeks preceding the 2005−2006 eruption 9°50′N, EPR. Earth and Planetary Science Letters, 403: 15–26. doi: 10.1016/j.jpgl.2014.06.015
[29]	Mutch E J F, Maclennan J, Holland T J B, et al. 2019. Millennial storage of near--Moho magma. Science, 365(6450): 260–264. doi: 10.1126/science.aax4092
[30]	Nielsen R L, Crum J, Bourgeois R, et al. 1995. Melt inclusions in high-An plagioclase from the Gorda Ridge: an example of the local diversity of MORB parent magmas. Contributions to Mineralogy and Petrology, 122(1−2): 34–50. doi: 10.1007/s004100050111
[31]	Niu Xiongwei, Ruan Aiguo, Li Jiabiao, et al. 2015. Along-axis variation in crustal thickness at the ultraslow spreading Southwest Indian Ridge (50°E) from a wide-angle seismic experiment. Geochemistry, Geophysics, Geosystems, 16(2): 468–485. doi: 10.1002/2014GC005645
[32]	Robinson C J, Bickle M J, Minshull T A, et al. 2001. Low degree melting under the Southwest Indian Ridge: the roles of mantle temperature, conductive cooling and wet melting. Earth and Planetary Science Letters, 188(3−4): 383–398. doi: 10.1016/S0012-821X(01)00329-6
[33]	Sauter D, Cannat M, Meyzen C, et al. 2009. Propagation of a melting anomaly along the ultraslow Southwest Indian Ridge between 46°E and 52°20′E: interaction with the Crozet hotspot?. Geophysical Journal International, 179(2): 687–699. doi: 10.1111/j.1365-246X.2009.04308.x
[34]	Shcherbakov V D, Plechov P Y, Izbekov P E, Shipman J S. 2011. Plagioclase zoning as an indicator of magma processes at Bezymianny Volcano, Kamchatka. Contributions to Mineralogy and Petrology, 162(1): 83–99. doi: 10.1007/s00410-010-0584-1
[35]	Sisson T W, Grove T L. 1993. Experimental investigations of the role of H₂O in calc-alkaline differentiation and subduction zone magmatism. Contributions to Mineralogy and Petrology, 113(2): 143–166. doi: 10.1007/BF00283225
[36]	Stolper E. 1980. A phase diagram for mid-ocean ridge basalts: preliminary results and implications for petrogenesis. Contributions to Mineralogy and Petrology, 74(1): 13–27. doi: 10.1007/BF00375485
[37]	Tao Chunhui, Lin Jian, Guo Shiqin, et al. 2012. First active hydrothermal vents on an ultraslow-spreading center: Southwest Indian Ridge. Geology, 40(1): 47–50. doi: 10.1130/G32389.1
[38]	Yang Fan, Huang Xiaolong, Xu Yigang, et al. 2019. Plume-ridge interaction in the South China Sea: thermometric evidence from Hole U1431E of IODP Expedition 349. Lithos, 324−325: 466–478. doi: 10.1016/j.lithos.2018.11.031
[39]	Yang A Y, Zhao Taiping, Zhou Meifu, et al. 2013. Os isotopic compositions of MORBs from the ultra-slow spreading Southwest Indian Ridge: Constraints on the assimilation and fractional crystallization (AFC) processes. Lithos, 179: 28–35. doi: 10.1016/j.lithos.2013.07.020
[40]	Yang A Y, Zhou Meifu, Zhao Taiping, et al. 2014. Chalcophile elemental compositions of morbs from the ultraslow-spreading southwest Indian ridge and controls of lithospheric structure on S-saturated differentiation. Chemical Geology, 382: 1–13. doi: 10.1016/j.chemgeo.2014.05.019
[41]	Yang A Y, Zhao T P, Zhou M F, et al. 2017. Isotopically enriched N-MORB: a new geochemical signature of off-axis plume-ridge interaction-a case study at 50°28′E, Southwest Indian Ridge. Journal of Geophysical Research: Solid Earth, 122(1): 191–213. doi: 10.1002/2016JB013284
[42]	Zhang Tao, Lin Jian, Gao Jinyao. 2013. Magmatism and tectonic processes in Area A hydrothermal vent on the Southwest Indian Ridge. Science China Earth Sciences, 56(12): 2186–2197. doi: 10.1007/s11430-013-4630-5