-
摘要:
西太平洋俯冲带是世界上最典型、最活跃的俯冲带，分布众多的海沟-岛弧-弧后盆地（沟弧盆）系统。马里亚纳俯冲带是典型的洋-洋俯冲带，而马里亚纳海槽作为马里亚纳俯冲带的重要构造单元，是研究不受陆壳物质影响的俯冲作用的理想区域。前人对马里亚纳海槽岩浆地幔源区性状、俯冲组分的影响、岩浆演化等进行了详细研究。结果表明：（1） 马里亚纳海槽岩浆源区主要为亏损地幔，岩性主要为橄榄岩，且不同区段具有不一致的地幔部分熔融程度；（2） 不同区段受到来自蚀变洋壳及沉积物的俯冲组分的影响程度也不同，并由此影响了不同区段的地幔熔融程度和初始岩浆成分；（3） 俯冲组分的影响自中段向南北两段逐渐加强，中段主要受到来自沉积物熔体的影响，南、北段受到板片释放的含水流体的影响则更为明显；（4） 不同区段甚至同一区段的岩浆在演化过程中，经历了橄榄石、辉石、斜长石等斑晶矿物的差异性分离结晶过程，这也很好地解释了该区丰富的岩石类型和玄武质岩石的不同矿物组合特征。以上研究很好地促进了对马里亚纳海槽岩浆作用过程的认识，也深化了对俯冲带构造-岩浆作用的理解。
Abstract:The Western Pacific subduction zone is one of the most typical and active ones in the world, featuring a vast distribution of trench-island arc-back-arc basin systems. The Mariana subduction zone is a typical ocean-ocean subduction zone, and the Mariana Trough is an important component tectonic unit and an ideal area to elucidate the subduction without the influence of continental crust materials. The magmatic processes of the Mariana Trough were studied in detail, such as rock mantle source properties, subduction components, and magmatic evolution. The research clarified that: (1) the magma source in the Mariana Trough is mostly depleted mantle as it features peridotite dominance and the degree of partial melting of the source mantle varies in different regions. (2) The subduction components from altered oceanic crust and sediments in different parts are affected to different degrees of mantle melting and initial magma composition in different regions. (3) The influence of subduction components gradually increased from the middle section to the north and south sections. The middle section was mainly affected by melt from sediments, and the south and north sections were more significantly affected by hydrous fluids. (4) During the magma evolution in different regions or even in the same region, the fractional crystallization of olivine, pyroxene, and plagioclase can well explain the diverse rock types and different phenocryst assemblages in basaltic rocks. The achievements above could promote the understanding of the magmatism process in the Mariana Trough and also strengthen the deep understanding of tectonic-magmatism in the subduction zone.
-
Key words:
- mantle melting /
- subduction components /
- magma evolution /
- back-arc basin /
- Western Pacific
-
-
[1] 曾志刚, 张玉祥, 陈祖兴, 等. 西太平洋典型弧后盆地的地质构造、岩浆作用与热液活动[J]. 海洋科学集刊, 2016(51):3-36
ZENG Zhigang, ZHANG Yuxiang, CHEN Zuxing, et al. Geological tectonics, magmatism and seafloor hydrothermal activity in the back-arc basins of the Western Pacific[J]. Studia Marina Sinica, 2016(51):3-36.
[2] 石学法, 鄢全树. 西太平洋典型边缘海盆的岩浆活动[J]. 地球科学进展, 2013, 28(7):737-750
SHI Xuefa, YAN Quanshu. Magmatism of typical marginal basins (or back-arc basins) in the West Pacific[J]. Advances in Earth Science, 2013, 28(7):737-750.
[3] 刘鑫, 李三忠, 赵淑娟, 等. 马里亚纳俯冲系统的构造特征[J]. 地学前缘, 2017, 24(4):329-340
LIU Xin, LI Sanzhong, ZHAO Shujuan, et al. Structure of the Mariana subduction system[J]. Earth Science Frontiers, 2017, 24(4):329-340.
[4] Tian L Y, Zhao G T, Zhao G C, et al. Geochemistry of basaltic lavas from the Mariana Trough: evidence for influence of subduction component on the generation of backarc basin magmas[J]. International Geology Review, 2005, 47(4):387-397. doi: 10.2747/0020-6814.47.4.387
[5] Guo K, Zhai S K, Wang X Y, et al. The dynamics of the southern Okinawa Trough magmatic system: new insights from the microanalysis of the An contents, trace element concentrations and Sr isotopic compositions of plagioclase hosted in basalts and silicic rocks[J]. Chemical Geology, 2018, 497:146-161. doi: 10.1016/j.chemgeo.2018.09.002
[6] Zhang Y X, Zeng Z G, Gaetani G, et al. Mineralogical constraints on the magma mixing beneath the Iheya Graben, an active back-arc spreading Centre of the Okinawa trough[J]. Journal of Petrology, 2020, 61(9):egaa098.
[7] 李晓辉, 杨慧心, 曾志刚. 西太平洋弧后盆地火山岩中熔体包裹体研究进展[J]. 海洋地质与第四纪地质, 2021, 41(1):166-179
LI Xiaohui, YANG Huixin, ZENG Zhigang. Advances in melt inclusion studies in back-arc basin volcanic rocks in Western Pacific[J]. Marine Geology & Quaternary Geology, 2021, 41(1):166-179.
[8] Fryer P. Geology of the Mariana trough[M]//Taylor B. Backarc Basins: Tectonics and Magmatism. New York: Springer, 1995: 237-279.
[9] Lai Z Q, Zhao G T, Han Z Z, et al. The magma plumbing system in the Mariana Trough back-arc basin at 18° N[J]. Journal of Marine Systems, 2018, 180:132-139. doi: 10.1016/j.jmarsys.2016.11.008
[10] Zhao G T, Luo W Q, Lai Z Q, et al. Influence of subduction components on magma composition in back‐arc basins: a comparison between the Mariana and Okinawa troughs[J]. Geological Journal, 2016, 51(S1):357-367. doi: 10.1002/gj.2820
[11] Pearce J A, Stern R J, Bloomer S H, et al. Geochemical mapping of the Mariana arc–basin system: implications for the nature and distribution of subduction components[J]. Geochemistry, Geophysics, Geosystems, 2005, 6(7):Q07006.
[12] Anderson M O, Chadwick W W Jr, Hannington M D, et al. Geological interpretation of volcanism and segmentation of the Mariana back-arc spreading center between 12.7°N and 18.3°N[J]. Geochemistry, Geophysics, Geosystems, 2017, 18(6):2240-2274. doi: 10.1002/2017GC006813
[13] Hawkins J W, Lonsdale P F, Macdougall J D, et al. Petrology of the axial ridge of the Mariana Trough backarc spreading center[J]. Earth and Planetary Science Letters, 1990, 100(1-3):226-250. doi: 10.1016/0012-821X(90)90187-3
[14] Lai Z Q, Gao W, Han Z Z, et al. Mineralogical and geochemical constraints on the mantle source characteristics of basaltic lavas from the central Mariana Trough[J]. Journal of Ocean University of China, 2023, 22(5):1313-1325. doi: 10.1007/s11802-023-5449-0
[15] Martínez F, Fryer P, Baker N A, et al. Evolution of backarc rifting: Mariana Trough, 20°-24°N[J]. Journal of Geophysical Research:Solid Earth, 1995, 100(B3):3807-3827. doi: 10.1029/94JB02466
[16] Stern R J, Bloomer S H, Martinez F, et al. The composition of back-arc basin lower crust and upper mantle in the Mariana Trough: a first report[J]. Island Arc, 1996, 5(3):354-372. doi: 10.1111/j.1440-1738.1996.tb00036.x
[17] Michibayashi K, Ohara Y, Stern R J, et al. Peridotites from a ductile shear zone within back-arc lithospheric mantle, southern Mariana Trench: results of a Shinkai 6500 dive[J]. Geochemistry, Geophysics, Geosystems, 2009, 10(5):Q05X06. doi: 10.1029/2008GC002197
[18] Gribble R F, Stern R J, Bloomer S H, et al. MORB mantle and subduction components interact to generate basalts in the southern Mariana Trough back-arc basin[J]. Geochimica et Cosmochimica Acta, 1996, 60(12):2153-2166. doi: 10.1016/0016-7037(96)00078-6
[19] 高永军, 穆治国, 吴世迎. 马里亚纳海槽玄武岩K-Ar地质年代学及地球化学研究[J]. 海洋地质与第四纪地质, 2000, 20(3):53-59
GAO Yongjun, MU Zhiguo, WU Shiying. Studies on K-Ar geochronology and geochemistry of Mariana Trough basalts[J]. Marine Geology & Quaternary Geology, 2000, 20(3):53-59.
[20] Yan Q S, Zhang P Y, Metcalfe I, et al. Geochemistry of axial lavas from the mid- and southern Mariana Trough, and implications for back-arc magmatic processes[J]. Mineralogy and Petrology, 2019, 113(6):803-820. doi: 10.1007/s00710-019-00683-x
[21] 张国良, 罗青, 陈立辉. 大洋地幔化学组成不均一性成因研究回顾及展望[J]. 海洋地质与第四纪地质, 2017, 37(1):1-13
ZHANG Guoliang, LUO Qing, CHEN Lihui. Geochemical heterogeneity of oceanic mantle: a review[J]. Marine Geology & Quaternary Geology, 2017, 37(1):1-13.
[22] Rubin K H, Sinton J M, Maclennan J, et al. Magmatic filtering of mantle compositions at mid-ocean-ridge volcanoes[J]. Nature Geoscience, 2009, 2(5):321-328. doi: 10.1038/ngeo504
[23] Pearce J A, Stern R J. Origin of back-arc basin magmas: trace element and isotope perspectives[M]//Christie D M, Fisher C R, Lee S M, et al. Back-Arc Spreading Systems: Geological, Biological, Chemical, and Physical Interactions. Washington: American Geophysical Union, 2006: 63-86.
[24] Volpe A M, Macdougall J D, Lugmair G W, et al. Fine-scale isotopic variation in Mariana Trough basalts: evidence for heterogeneity and a recycled component in backarc basin mantle[J]. Earth and Planetary Science Letters, 1990, 100(1-3):251-264. doi: 10.1016/0012-821X(90)90188-4
[25] Woodhead J, Stern R J, Pearce J, et al. Hf-Nd isotope variation in Mariana Trough basalts: the importance of “ambient mantle” in the interpretation of subduction zone magmas[J]. Geology, 2012, 40(6):539-542. doi: 10.1130/G32963.1
[26] Volpe A M, Macdougall J D, Hawkins J W. Mariana Trough basalts (MTB): trace element and Sr-Nd isotopic evidence for mixing between MORB-like and Arc-like melts[J]. Earth and Planetary Science Letters, 1987, 82(3-4):241-254. doi: 10.1016/0012-821X(87)90199-3
[27] Hawkins J W, Melchior J T. Petrology of Mariana Trough and Lau basin basalts[J]. Journal of Geophysical Research, 1985, 90(B13):11431-11468. doi: 10.1029/JB090iB13p11431
[28] 来志庆. 马里亚纳海槽中段深部岩浆作用过程研究[D]. 中国海洋大学博士学位论文, 2019
LAI Zhiqing. Magma formation and evolution in the Middle Mariana Trough[D]. Doctor Dissertation of Ocean University of China, 2019.
[29] Stern R J, Fouch M J, Klemperer S L. An overview of the Izu-Bonin-Mariana subduction factory[M]//Eiler J. Inside the Subduction Factory. Washington: American Geophysical Union, 2004: 175-222.
[30] Pearce J A, Kempton P D, Nowell G M, et al. Hf-Nd element and isotope perspective on the nature and provenance of mantle and subduction components in Western Pacific arc-basin systems[J]. Journal of Petrology, 1999, 40(11):1579-1611. doi: 10.1093/petroj/40.11.1579
[31] Workman R K, Hart S R. Major and trace element composition of the depleted MORB mantle (DMM)[J]. Earth and Planetary Science Letters, 2005, 231(1-2):53-72. doi: 10.1016/j.jpgl.2004.12.005
[32] Gribble R F, Stern R J, Newman S, et al. Chemical and isotopic composition of lavas from the northern Mariana Trough: implications for magmagenesis in back-arc basins[J]. Journal of Petrology, 1998, 39(1):125-154. doi: 10.1093/petroj/39.1.125
[33] Kelley K A, Plank T, Grove T L, et al. Mantle melting as a function of water content beneath back-arc basins[J]. Journal of Geophysical Research:Solid Earth, 2006, 111(B9):B09208.
[34] 曹志敏, 安伟, 周美夫, 等. 马里亚纳海槽扩张轴(中心)玄武岩铂族元素特征[J]. 海洋学报, 2006, 28(5):69-75
CAO Zhimin, AN Wei, ZHOU Meifu, et al. Characteristics of platinum-group elements in Mariana Trough basalts[J]. Acta Oceanologica Sinica, 2006, 28(5):69-75.
[35] Ohara Y, Stern R J, Ishii T, et al. Peridotites from the Mariana Trough: first look at the mantle beneath an active back-arc basin[J]. Contributions to Mineralogy and Petrology, 2002, 143(1):1-18. doi: 10.1007/s00410-001-0329-2
[36] Sinton J M, Fryer P. Mariana Trough lavas from 18°N: implications for the origin of back arc basin basalts[J]. Journal of Geophysical Research:Solid Earth, 1987, 92(B12):12782-12802. doi: 10.1029/JB092iB12p12782
[37] Li X H, Yan Q S, Zeng Z G, et al. Across-arc variations in Mo isotopes and implications for subducted oceanic crust in the source of back-arc basin volcanic rocks[J]. Geology, 2021, 49(10):1165-1170. doi: 10.1130/G48754.1
[38] Wiens D A, Kelley K A, Plank T. Mantle temperature variations beneath back-arc spreading centers inferred from seismology, petrology, and bathymetry[J]. Earth and Planetary Science Letters, 2006, 248(1-2):30-42. doi: 10.1016/j.jpgl.2006.04.011
[39] Matsuno T, Seama N, Shindo H P, et al. Enhanced and asymmetric melting beneath the southern Mariana back-arc spreading center under the influence of Pacific plate subduction[J]. Journal of Geophysical Research:Solid Earth, 2022, 127(3):e2021JB022374. doi: 10.1029/2021JB022374
[40] Stern R J. Subduction zones[J]. Reviews of Geophysics, 2002, 40(4):3-1-3-13.
[41] Yan Q S, Meng X W, Shi X F. Geochemical and Sr-Nd-Hf-Pb isotopic constraints the petrogenesis and origin of basalts from the southern Okinawa Trough[J]. Acta Geologica Sinica:English Edition, 2019, 93(S2):116-119. doi: 10.1111/1755-6724.14216
[42] Ikeda Y, Nagao K, Ishii T, et al. Contributions of slab fluid and sediment melt components to magmatism in the Mariana Arc–Trough system: evidence from geochemical compositions and Sr, Nd, and noble gas isotope systematics[J]. Island Arc, 2016, 25(4):253-273. doi: 10.1111/iar.12150
[43] Masuda H, Fryer P. Geochemical characteristics of active backarc basin volcanism at the southern end of the Mariana Trough[M]//Ishibashi J I, Okino K, Sunamura M. Subseafloor Biosphere Linked to Hydrothermal Systems. Tokyo: Springer, 2015: 261-273.
[44] Chen Z X, Chen J B, Zeng Z G, et al. Zinc isotopes of the Mariana and Ryukyu arc-related lavas reveal recycling of forearc serpentinites into the subarc mantle[J]. Journal of Geophysical Research:Solid Earth, 2021, 126(11):e2021JB022261. doi: 10.1029/2021JB022261
[45] 徐义刚, 王强, 唐功建, 等. 弧玄武岩的成因: 进展与问题[J]. 中国科学: 地球科学, 2020, 50(12): 1818-1844
XU Yigang, WANG Qiang, TANG Gongjian, et al. The origin of arc basalts: New advances and remaining questions[J]. Science China Earth Sciences, 2020, 63(12): 1969-1991.
[46] Ribeiro J M, Stern R J, Martinez F, et al. Asthenospheric outflow from the shrinking Philippine Sea Plate: evidence from Hf–Nd isotopes of southern Mariana lavas[J]. Earth and Planetary Science Letters, 2017, 478:258-271. doi: 10.1016/j.jpgl.2017.08.022
[47] 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. doi: 10.1144/GSL.SP.1989.042.01.19
[48] Niu Y L, O'Hara M J, Pearce J A. Initiation of subduction zones as a consequence of lateral compositional buoyancy contrast within the lithosphere: a petrological perspective[J]. Journal of Petrology, 2003, 44(5):851-866. doi: 10.1093/petrology/44.5.851
[49] 张平阳, 鄢全树. 马里亚纳海槽玄武岩中斜长石矿物化学及意义[J]. 海洋科学进展, 2017, 35(2):234-248
ZHANG Pingyang, YAN Quanshu. Compositions of plagioclase hosted by basaltic rocks from the Mariana Trough and their petrogenesis significances[J]. Advances in Marine Science, 2017, 35(2):234-248.
[50] Newman S, Stolper E, Stern R. H2O and CO2 in magmas from the Mariana arc and back arc systems[J]. Geochemistry, Geophysics, Geosystems, 2000, 1(1):1013.
[51] Newman S, Macdougall J D, Finkel R C. 230Th-238U disequilibrium in island arcs: evidence from the Aleutians and the Marianas[J]. Nature, 1984, 308(5956):268-270. doi: 10.1038/308268a0
[52] 孙海青, 高爱国, 倪培, 等. 马里亚纳海槽玄武岩中熔融包裹体的初步研究[J]. 海洋科学进展, 2004, 22(3):292-298
SUN Haiqing, GAO Aiguo, NI Pei, et al. A preliminary study on melt inclusions in basalts from the Mariana Trough[J]. Advances in Marine Science, 2004, 22(3):292-298.
[53] Chen Z X, Chen J B, Tamehe L S, et al. Light Fe isotopes in arc magmas from cold subduction zones: implications for serpentinite-derived fluids oxidized the sub-arc mantle[J]. Geochimica et Cosmochimica Acta, 2023, 342:1-14. doi: 10.1016/j.gca.2022.12.005
-
下载:
图(5)
计量
- 文章访问数: 1471
- PDF下载数: 84
- 施引文献: 0