The geological and structural characteristics of the southern Parece Vela Basin and their genetic mechanisms
-
摘要: 帕里西维拉海盆是西太平洋地区最大、最典型的弧后盆地，根据帕里西维拉海盆的形态特征，将帕里西维拉海盆分为帕里西维拉海盆主盆地和帕里西维拉海盆南端。本文利用国际公开的重力数据和实测的多波束、浅地层剖面数据研究了帕里西维拉海盆南端的重力异常特征和海底地形特征，并进一步探讨了该区域的特殊性及成因机制。海底地形与地球物理特征研究表明，帕里西维拉海盆南端可划分为A、B、C、D、E 5个区域，分别代表海盆NE−SW向扩张形成的NW−SE向扩张构造、海盆E−W向扩张形成的N−S向扩张构造、海盆旋转过程中由北向南传播的扩张中心与海盆最南端的裂谷系统相互作用形成的NEE−SWW向构造、与帕里西维拉海盆同期形成的海山区以及裂谷系统相互作用形成的深渊区。海盆南端表现出明显的东西不对称性，海盆只存在扩张中心以西的部分，推测受卡罗琳海脊碰撞影响，帕里西维拉海盆南端东半部一部分逆冲至雅浦岛弧之上，还有一部分被推离至现今西马里亚纳海脊以西，随着洋壳持续的逆冲和迁移，最南端逐渐暴露的帕里西维拉海盆扩张中心与雅浦海沟合并，形成现今的雅浦海沟，最终造成了现今帕里西维拉海盆南端缺失东半部的构造形态。Abstract: Parece Vela Basin (PVB), the most typical and largest back-arc basin in the western Pacific, is divided into the main PVB and the southern PVB based on its morphological distribution. In this study, the gravity anomalies and seafloor topographic features of the southern PVB are analyzed based on the open source gravity data, the measured swath bathymetry data and the sub-bottom profile data, and the particularity of this region and its genetic mechanism are further discussed. According to the seafloor topographic and geophysical characteristics, the southern PVB is mainly divided into five regions, namely, A, B, C, D, and E, which represent that the NW−SE seafloor fabrics formed during the NE−SW spreading, that the N−S spreading fabrics formed during the stage of E−W spreading of the PVB, that the NEE−SWW fabrics formed by the interaction between N−S trending spreading axis propagated from the north and the southernmost rift system during the rotation of the basin, that the seamounts formed at the same time as the PVB, and that the deeps formed by the interaction of the rift systems, respectively. The southern PVB shows obvious east-west asymmetry, that is, only the part west of the spreading center exists in the basin. We speculate that a part of the eastern half of the southern PVB thrusted over the Yap Arc, and another part was offset by a transform fault and the region now lies west of the West Mariana Ridge affected by the collision of the Caroline Ridge. With the continuous thrusting and migration of the oceanic crust, the gradually exposed spreading center of the southern PVB merged with the Yap Trench to form the present Yap Trench, and finally resulting in the absence of the eastern counterpart of the southern PVB.
-
Key words:
- seafloor topography /
- gravity anomaly /
- structural morphology /
- Caroline Ridge /
- genetic mechanisms
-
图 2 帕里西维拉海盆南端的海底地形渲染图（a）和叠加在水深阴影图上的构造特征图（b）
Fig. 2 Render map of submarine topography of the southern Parece Vela Basin (a) and structural features superimposed on the bathymetry shadow map (b)
图 3 研究区的地形和沉积特征
a. A区的浅地层剖面；b. B区的多道地震剖面，改自Dong等[32]；c. C区的浅地层剖面。剖面位置见图2a
Fig. 3 Topography and sedimentary characteristics of the study area
a. A sub-bottom profile of Area A; b. a multi-channel seismic profile of Area B, modified from Dong et al. [32]; c. a sub-bottom profile of Area C. the location of profiles are shown in Figure 2a
图 4 研究区重力异常
a. 空间重力异常；b. 完全布格重力异常
Fig. 4 Gravity anomaly map of the study area
a. Free-air anomaly map of the study area; b. Bouguer anomaly map of the study area
-
[1] 殷征欣, 李正元, 沈泽中, 等. 西太平洋帕里西维拉海盆不对称性发育特征及其成因[J]. 吉林大学学报(地球科学版), 2019, 49(1): 218−229. doi: 10.13278/j.cnki.jjuese.20180140Yin Zhengxin, Li Zhengyuan, Shen Zezhong, et al. Asymmetric geological developments and their geneses of the Parece Vela Basin in western Pacific Ocean[J]. Journal of Jilin University (Earth Science Edition), 2019, 49(1): 218−229. doi: 10.13278/j.cnki.jjuese.20180140 [2] Mrozowski C L, Hayes D E. The evolution of the Parece Vela Basin, eastern Philippine Sea[J]. Earth and Planetary Science Letters, 1979, 46(1): 49−67. doi: 10.1016/0012-821X(79)90065-7 [3] 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 [4] Okino K, Kasuga S, Ohara Y. A new scenario of the Parece Vela Basin genesis[J]. Marine Geophysical Researches, 1998, 20(1): 21−40. doi: 10.1023/A:1004377422118 [5] 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. [6] 夏成龙, 郑彦鹏, 董冬冬, 等. 菲律宾海盆磁条带特征及61Ma以来的海底扩张过程重建[J]. 海洋地质与第四纪地质, 2017, 37(1): 30−40. doi: 10.16562/j.cnki.0256-1492.2017.01.004Xia Chenglong, Zheng Yanpeng, Dong Dongdong, et al. Characteristics of magnetic lineations and reconstruction of seafloor spreading processes of the Philippine Sea Basin since 61 Ma[J]. Marine Geology & Quaternary Geology, 2017, 37(1): 30−40. doi: 10.16562/j.cnki.0256-1492.2017.01.004 [7] Fujioka K, Kanamatsu T, Ohara Y, et al. Parece Vela Rift and central basin fault revisited-STEPS-IV (Structure, tectonics and evolution of the philippine sea)-Cruise summary report[J]. InterRidge News, 2000, 9(1): 18−22. [8] 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 [9] Zhang Yong, Li Sanzhong, Suo Yanhui, et al. Origin of transform faults in back-arc basins: examples from Western Pacific marginal seas[J]. Geological Journal, 2016, 51(S1): 490−512. [10] 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. [11] 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: American Geophysical Union (AGU), 1983. [12] 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. doi: 10.1023/A:1004781927661 [13] 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 [14] Xia Chenglong, Zheng Yanpeng, Liu Baohua, et al. Geological and geophysical differences between the north and south sections of the Yap trench-arc system and their relationship with Caroline Ridge subduction[J]. Geological Journal, 2020, 55(12): 7775−7789. doi: 10.1002/gj.3903 [15] 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. [16] 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 [17] 张臻, 李三忠. 雅浦沟−弧体系构造演化过程[J]. 海洋地质与第四纪地质, 2019, 39(5): 138−146. doi: 10.16562/j.cnki.0256-1492.2019090301Zhang Zhen, Li Sanzhong. Tectonic evolution of the Yap trench-arc system[J]. Marine Geology & Quaternary Geology, 2019, 39(5): 138−146. doi: 10.16562/j.cnki.0256-1492.2019090301 [18] Ishizuka O, Hickey-Vargas R, Arculus R J, et al. Age of Izu-Bonin-Mariana arc basement[J]. Earth and Planetary Science Letters, 2018, 481: 80−90. doi: 10.1016/j.jpgl.2017.10.023 [19] Yamazaki T, Seama N, Okino K, et al. Spreading process of the northern Mariana Trough: rifting-spreading transition at 22°N[J]. Geochemistry, Geophysics, Geosystems, 2003, 4(9): 1075. [20] 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 [21] 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: American Geophysical Union, 1980: 247−268. [22] Hegarty K A, Weissel J K. Complexities in the development of the Caroline Plate region, western equatorial Pacific[M]//Nairn A E M, Stehli F G, Uyeda S. The Ocean Basins and Margins. Boston: Springer, 1988: 277−301. [23] Zhang Guoliang, Zhang Ji, Wang Shuai, et al. Geochemical and chronological constraints on the mantle plume origin of the Caroline Plateau[J]. Chemical Geology, 2020, 540: 119566. doi: 10.1016/j.chemgeo.2020.119566 [24] Zhang Ji, Zhang Guoliang. Geochemical and chronological evidence for collision of proto-Yap arc/Caroline plateau and rejuvenated plate subduction at Yap trench[J]. Lithos, 2020, 370−371: 105616. doi: 10.1016/j.lithos.2020.105616 [25] Fujioka K, Furuta T, Kimura G, et al. Sediments and rocks in and around the Palau and Yap Trenches, Preliminary Rep. of Hakuho-maru Cruise KH86-1[C]. Ocean Res, Inst, Unit. Tokyo, 1986, 38−148. [26] Crawford A J, Beccaluva L, Serri G, et al. Petrology, geochemistry and tectonic implications of volcanics dredged from the intersection of the Yap and Mariana trenches[J]. Earth and Planetary Science Letters, 1986, 80(3/4): 265−280. [27] Nagihara S, Kinoshita M, Fujimoto H, et al. Geophysical observations around the northern Yap Trench: seismicity, gravity and heat flow[J]. Tectonophysics, 1989, 163(1/2): 93−104. [28] 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. [29] GEBCO Bathymetric Compilation Group. The GEBCO_2019 Grid. A continuous terrain model of the global oceans and land[G]. UK: British Oceanographic Data Centre, National Oceanography Centre, NERC, 2019. [30] Sandwell D T, Müller R D, Smith W H F, et al. New global marine gravity model from CryoSat-2 and Jason-1 reveals buried tectonic structure[J]. Science, 2014, 346(6205): 65−67. doi: 10.1126/science.1258213 [31] Smith W H F, Sandwell D T. Global sea floor topography from satellite altimetry and ship depth soundings[J]. Science, 1997, 277(5334): 1956−1962. doi: 10.1126/science.277.5334.1956 [32] Dong Dongdong, Zhang Zhengyi, Bai Yongliang, 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 [33] Ohara Y, Kasuga S, Ishii T. Peridotites from the Parece Vela Rift in the Philippine Sea. Upper mantle material exposed in an extinct back-arc basin[J]. Proceedings of the Japan Academy, Series B, 1996, 72(6): 118−123. doi: 10.2183/pjab.72.118 [34] 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 [35] Yang Yaomin, Wu Shiguo, Gao Jinwei, et al. Geology of the Yap Trench: new observations from a transect near 10°N from manned submersible Jiaolong[J]. International Geology Review, 2018, 60(16): 1941−1953. doi: 10.1080/00206814.2017.1394226 -
下载:
图(6)
计量
- 文章访问数: 195
- HTML全文浏览量: 75
- PDF下载量: 60
- 被引次数: 0
