Tectonic evolution of the Yap trench-arc system
-
摘要:
雅浦沟-弧体系具有十分独特的地质特征，雅浦岛弧以变质岩为主，岛弧岩浆作用较为缺乏，同时雅浦沟-弧距离异常短，增生楔缺失。在总结雅浦沟-弧系统及其邻区的地球化学、地球物理以及构造特征等证据的基础上，探讨了雅浦沟-弧系统的构造演化过程。雅浦岛上的变质基底具有相对较高的K2O含量、高Ti含量以及较低的87Sr/86Sr比值，表明雅浦岛上的变质基底为帕里西维拉海盆洋壳的一部分。雅浦海沟东侧存在一块水深较深的三角形区域将雅浦岛弧与加罗林海岭间隔开来，地球物理特征显示该区域并没有受到加罗林热点的影响，说明加罗林海岭并没有与雅浦岛弧直接碰撞。结合帕里西维拉海盆在20～15 Ma的NE-SW向扩张以及与之相关的海盆东西两侧洋壳发生的左旋相对移动，推测雅浦海沟很可能是雅浦岛弧东侧的扩张中心暴露转变成的俯冲带，而雅浦海沟东侧的三角形区域则为俯冲板片重新暴露的结果。
-
关键词:
- 雅浦岛弧 /
- 帕里西维拉海盆 /
- 索罗尔海槽；构造演化
Abstract:The geological characteristics of the Yap trench-arc system is quite unique, which is dominated by metamorphic rocks and lack of island arc magmatism. Meanwhile, the trench-island distance of the Yap trench-arc system is abnormally short and the accretion wedge is absent. In this paper, the tectonic evolution of the Yap trench-arc system is discussed on the basis of geochemical, geophysical and tectonic data. The metamorphic basement of Yap island has relatively high K2O, Ti and low 87Sr/86Sr ratio, which indicates that the basement is once the oceanic crust of the Parece-Vela basin. A deep triangular area is located on the east side of the Yap trench which separates the Yap island arc from the Caroline ridge. The geophysical characteristics of this triangular area demonstrate that the area has not been affected by the Caroline Hotspot, and then the Caroline ridge does not collide with the Yap island arc directly. Considering the spreading of the Parece-Vela basin in NE-SW trending at 20～15 Ma and the relative sinistral movement of the oceanic crust on both sides of the Parece-Vela basin, the Yap trench is probably a subduction zone formed by the exposure of the spreading center on the eastern side of the Yap island arc, while the triangular area on the eastern side of the Yap trench is caused by the re-exposure of the subduction plates.
-
Key words:
- Yap island arc /
- Parece-Vela basin /
- Sorol trough;tectonic evolution
-
-
图 3 雅浦岛变质岩和岛弧岩浆岩F1-F2图解（a）与雅浦组变质岩Cr-Ti图解(b)及帕里西维拉海盆洋壳以及马里亚纳火山弧的Pb-Sr同位素图解（c）
Figure 3.
-
[1] Ohara Y, Fujioka K, Ishizuka O, et al. Peridotites and volcanics from the Yap arc system: implications for tectonics of the southern Philippine Sea Plate [J]. Chemical Geology, 2002, 189(1-2): 35-53. doi: 10.1016/S0009-2541(02)00062-1
[2] Matsuda J I, Zashu S, Ozima M. Sr isotopic studies of volcanic rocks from island arcs in the western pacific [J]. Tectonophysics, 1977, 37(1-3): 141-151. doi: 10.1016/0040-1951(77)90044-0
[3] Shiraki K. Metamorphic basement rocks of Yap Islands, western Pacific: possible oceanic crust beneath an island arc [J]. Earth and Planetary Science Letters, 1971, 13(1): 167-174. doi: 10.1016/0012-821X(71)90120-8
[4] Hawkins J, Batiza R. Metamorphic rocks of the Yap arc-trench system [J]. Earth and Planetary Science Letters, 1977, 37(2): 216-229. doi: 10.1016/0012-821X(77)90166-2
[5] Sato T, Kasahara J, Katao H, et al. Seismic observations at the Yap Islands and the northern Yap Trench [J]. Tectonophysics, 1997, 271(3-4): 285-294. doi: 10.1016/S0040-1951(96)00251-X
[6] Fujiwara T, Tamura C, Nishizawa A, et al. Morphology and tectonics of the Yap Trench [J]. Marine Geophysical Researches, 2000, 21(1-2): 69-86.
[7] Sato T, Matsu’ura M. A kinematic model for evolution of island arc-trench systems [J]. Geophysical Journal International, 1993, 114(3): 512-530. doi: 10.1111/j.1365-246X.1993.tb06984.x
[8] Kim Y M, Lee S M, Okino K. Comparison of gravity anomaly between mature and immature intra-oceanic subduction zones in the western Pacific [J]. Tectonophysics, 2009, 474(3-4): 657-673. doi: 10.1016/j.tecto.2009.05.004
[9] 张正一, 董冬冬, 张广旭, 等. 板块俯冲侵蚀雅浦岛弧的地形制约[J]. 海洋地质与第四纪地质, 2017, 37(1):41-50
ZHANG Zhengyi, DONG Dongdong, ZHANG Guangxu, et al. Topographic constraints on the subduction erosion of the Yap Arc, western Pacific [J]. Marine Geology & Quaternary Geology, 2017, 37(1): 41-50.
[10] McCabe R, Uyeda S. Hypothetical model for the bending of the Mariana Arc[M]//Hayes D E. The Tectonic and Geologic Evolution of Southeast Asian Seas and Islands: Part 2. Washington DC: AGU, 1983: 281-293.
[11] Lee S M. Deformation from the convergence of oceanic lithosphere into Yap trench and its implications for early-stage subduction [J]. Journal of Geodynamics, 2004, 37(1): 83-102. doi: 10.1016/j.jog.2003.10.003
[12] Dong D D, Zhang Z Y, Bai Y L, et al. Topographic and sedimentary features in the Yap subduction zone and their implications for the Caroline Ridge subduction [J]. Tectonophysics, 2018, 722: 410-421. doi: 10.1016/j.tecto.2017.11.030
[13] 张吉, 张国良. 雅浦岛弧变质岩成因和构造环境研究[J]. 海洋地质与第四纪地质, 2018, 38(4):71-82
ZHANG Ji, ZHANG Guoliang. Origin and tectonic setting of metamorphic rocks in the Yap Island Arc [J]. Marine Geology & Quaternary Geology, 2018, 38(4): 71-82.
[14] Okino K, Ohara Y, Kasuga S, et al. The Philippine Sea: new survey results reveal the structure and the history of the marginal basins [J]. Geophysical Research Letters, 1999, 26(15): 2287-2290. doi: 10.1029/1999GL900537
[15] Kasuga S, Ohara Y. A new model of back-arc spreading in the Parece Vela Basin, northwest Pacific margin [J]. Island Arc, 1997, 6(3): 316-326. doi: 10.1111/j.1440-1738.1997.tb00181.x
[16] Sdrolias M, Roest W R, Müller R D. An expression of Philippine Sea plate rotation: the Parece Vela and Shikoku Basins [J]. Tectonophysics, 2004, 394(1-2): 69-86. doi: 10.1016/j.tecto.2004.07.061
[17] Ishizuka O, Yuasa M, Taylor R N, et al. Two contrasting magmatic types coexist after the cessation of back-arc spreading [J]. Chemical Geology, 2009, 266(3-4): 274-296. doi: 10.1016/j.chemgeo.2009.06.014
[18] Tani K, Dunkley D J, Ohara Y. Termination of backarc spreading: zircon dating of a giant oceanic core complex [J]. Geology, 2011, 39(1): 47-50. doi: 10.1130/G31322.1
[19] Beccaluva L, Macciotta G, Savelli C, et al. Geochemistry and K/Ar ages of volcanics dredged in the Philippine Sea (Mariana, Yap, and Palau trenches and Parece Vela Basin)[M]//Hayes D E. The Tectonic and Geologic Evolution of Southeast Asian Seas and Islands. Washington DC: AGU, 1980: 247-268.
[20] Ryan W B F, Carbotte S M, Coplan J O, et al. Global multi‐resolution topography synthesis [J]. Geochemistry, Geophysics, Geosystems, 2009, 10(3): Q03014.
[21] Altis S. Origin and tectonic evolution of the Caroline Ridge and the Sorol Trough, western tropical Pacific, from admittance and a tectonic modeling analysis [J]. Tectonophysics, 1999, 313(3): 271-292. doi: 10.1016/S0040-1951(99)00204-8
[22] Okino K, Ohara Y, Fujiwara T, et al. Tectonics of the southern tip of the Parece Vela Basin, Philippine Sea Plate [J]. Tectonophysics, 2009, 466(3-4): 213-228. doi: 10.1016/j.tecto.2007.11.017
[23] Tayama R. Topography, geology and coral reef of the yap Islands[R]. Contributions from the Institute of Geology and Paleontology, Tohoku Imperial University, 1935, 9: 43(in Japanese).
[24] Cole W S, Todd R, Johnson C G. Conflicting age determination suggested by foraminifera on Yap, Caroline Island [J]. Bulletins of American Paleontology, 1960(186): 77-112.
[25] Pearce J A. Statistical analysis of major element patterns in basalts [J]. Journal of Petrology, 1976, 17(1): 15-43. doi: 10.1093/petrology/17.1.15
[26] Shiraki K, Kuroda N, Maruyama S, et al. Evolution of the Tertiary volcanic rocks in the Izu-Mariana arc [J]. Bulletin Volcanologique, 1987, 41(4): 548-562.
[27] Hickey-Vargas R. Isotope characteristics of submarine lavas from the Philippine Sea: implications for the origin of arc and basin magmas of the Philippine tectonic plate [J]. Earth and Planetary Science Letters, 1991, 107(2): 290-304. doi: 10.1016/0012-821X(91)90077-U
[28] Hickey-Vargas R. Origin of the Indian Ocean-type isotopic signature in basalts from Philippine Sea plate spreading centers: an assessment of local versus large-scale processes [J]. Journal of Geophysical Research: Solid Earth, 1998, 103(B9): 20963-20979. doi: 10.1029/98JB02052
[29] Jenner F E, O'Neill H S C. Analysis of 60 elements in 616 ocean floor basaltic glasses [J]. Geochemistry, Geophysics, Geosystems, 2012, 13(2): Q02005.
[30] 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
[31] Kohut E J, Stern R J, Kent A J R, et al. Evidence for adiabatic decompression melting in the Southern Mariana Arc from high-Mg lavas and melt inclusions [J]. Contributions to Mineralogy and Petrology, 2006, 152(2): 201-221. doi: 10.1007/s00410-006-0102-7
[32] 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.
[33] Reagan M K, Ishizuka O, Stern R J, et al. Fore-arc basalts and subduction initiation in the Izu-Bonin-Mariana system [J]. Geochemistry, Geophysics, Geosystems, 2010, 11(3): Q03X12.
[34] Tamura Y, Ishizuka O, Stern R J, et al. Two Primary Basalt Magma types from Northwest Rota-1 Volcano, Mariana Arc [J]. Journal of Petrology, 2012, 52(6): 1143-1183.
[35] Ishizuka O, Taylor R N, Yuasa M, et al. Making and breaking an island arc: a new perspective from the Oligocene Kyushu‐Palau arc, Philippine Sea [J]. Geochemistry, Geophysics, Geosystems, 2011, 12(5): Q05005.
[36] Kobayashi K. Origin of the Palau and Yap trench-arc systems [J]. Geophysical Journal International, 2004, 157(3): 1303-1315. doi: 10.1111/j.1365-246X.2003.02244.x
[37] Kotake Y. Study on the tectonics of Western Pacific region derived from GPS data analysis [J]. Bulletin of Earthquake Research Institute, 2000, 75: 229-334.
[38] Tomoda Y, Fujimoto H. Gravity anomalies in the western Pacific and geophysical interpretation of their origin [J]. Journal of Physics of the Earth, 1981, 29: 387-419. doi: 10.4294/jpe1952.29.387
[39] Deschamps A, Lallemand S. The West Philippine Basin: an Eocene to early Oligocene back arc basin opened between two opposed subduction zones [J]. Journal of Geophysical Research: Solid Earth, 2002, 107(B12): 2322.
[40] Hall R. Cenozoic geological and plate tectonic evolution of SE Asia and the SW Pacific: computer-based reconstructions, model and animations [J]. Journal of Asian Earth Sciences, 2002, 20(4): 353-431. doi: 10.1016/S1367-9120(01)00069-4
-
下载:
图(6)
计量
- 文章访问数: 2767
- PDF下载数: 72
- 施引文献: 0