南极布兰斯菲尔德海峡区域重力场特征及异常分析

马龙; 郑彦鹏; 刘晨光; 赵强; 裴彦良; 华清峰; 李先锋; 夏成龙

doi:10.3969/j.issn.0253-4193.2017.12.005

南极布兰斯菲尔德海峡区域重力场特征及异常分析

doi: 10.3969/j.issn.0253-4193.2017.12.005

1.
国家海洋局第一海洋研究所海洋沉积与环境地质国家海洋局重点实验室, 山东青岛 266061;青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室, 山东青岛 266061
2.
中国海洋大学海洋地球科学学院, 山东青岛 266100

基金项目: 南北极环境综合考察与评估专项（CHINARE2016-01-03-02，CHINARE 2016-04-01-04）；泰山学者攀登计划（tspd 2016007）；国家基金委-山东省联合基金项目（U1606401）。

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出版历程
- 收稿日期: 2016-12-16
- 修回日期: 2017-06-14

Regional characteristics and anomaly analysis of gravity field for the Bransfield Strait, Antarctic

1.
Key Laboratory of Marine Sedimentology and Environmental Geology, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
2.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China

摘要

摘要: 南极布兰斯菲尔德海峡及周边区域是南极大陆火山、地震等新构造活动最活跃的地区，与南设得兰海沟、南设得兰群岛一同构成南极大陆边缘现存唯一的"沟-弧-盆"构造体系。本文基于"雪龙"船第28、第30航次实测数据及两个航次的国际共享资料，利用均衡改正数据处理方法获得布兰斯菲尔德海峡的莫霍面深度及其分布规律，分析深部构造-断裂的区域分布及其重力异常特征等。布兰斯菲尔德海峡内的空间重力异常呈条带状分布，走向总体与地形相近，布格重力异常则由两侧向中间升高，大致在坡折处形成异常场值为100×10^-5 m/s²的分界线，在中央次海盆和东部次海盆海山处形成两个异常高值圈闭，异常值最高为150×10^-5 m/s²。莫霍面深度以弧后扩张中心为最低值，向南设得兰群岛和南极半岛两个方向递增，深度从12 km递增至陆坡位置的24 km。
- 重力场特征 /
- 均衡改正 /
- 异常分析 /
- 南极 /
- 布兰斯菲尔德海峡
Abstract: Bransfield Strait and its surrounding areas are the most active neotectonics region of volcanoes and earthquakes, which constitute the only existing "trench-arc-basin" system together with the South Shetland Trench and South Shetland Islands. Based on the observed data from the 28th, 30th Antarctic expeditions and the international public data, this study takes use of the isostatic correction method to invert the Moho depth and its distribution characteristics. The gravity field anormaly of the deep tectonic was analyzed. The free-air gravity anomaly shows a strip-like distribution, orienting closely to the terrain. The Bouguer gravity anomaly in the strait rises up from both of the two sides to the middle. Two high-value-anomaly traps appear in the central trough and the seamounts in the eastern trough respectively, with the highest value up to 150×10^-5 m/s². The minimum value of Moho depth (12 km) appears in the back-arc spreading area. The depth gradually increases from the back-arc spreading area to the both sides (e.g., Bransfield Strait and Antarctic Peninsula), and reaches 24 km at the slope area.
- regional gravity field /
- isostatic correction /
- anomaly analysis /
- Antarctic /
- Bransfield Strait

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参考文献(39)

吕文正, 吴水根. 布兰斯菲尔德海槽——新生代裂谷[J]. 极地研究, 1989(4):28-35. Lu Wenzheng, Wu Shuigen. The Bransfield Trough-A Cenozoic Rift[J]. Antarctic Research, 1989(4):28-35.

陈圣源, 刘方兰, 梁东红. 南极布兰斯菲尔德海域地球物理场与地质构造[J]. 海洋地质与第四纪地质, 1997, 17(1):77-86. Chen Shengyuan, Liu Fanglan, Liang Donghong. Geophysical field and geologic structure of the Bransfield sea area in the Antractic circle[J]. Marine Geology & Quaternary Geology, 1997, 17(1):77-86.

姚伯初, 王光宇, 陈邦彦, 等. 南极布兰斯菲尔德海峡的地球物理场特征与构造发育史[J]. 南极研究, 1995, 7(1):25-34. Yao Bochu,Wang Guangyu, Chen Bangyan, et al. The characteristics of geophysical field and tectonical evolution evolution in the Bransfield Strait[J]. Antarctic Research, 1995, 7(1):25-34.

Dziak R P, Park M, Lee W S, et al. Tectonomagmatic activity and ice dynamics in the Bransfield Strait back-arc basin, Antarctica[J]. Journal of Geophysical Research:Solid Earth (1978-2012), 2010, 115(B1):B01102.

Galindo-Zaldívar J, Gamboa L, Maldonado A, et al. Tectonic development of the Bransfield Basin and its prolongation to the South Scotia Ridge, northern Antarctic Peninsula[J]. Marine Geology, 2004, 206(1):267-282.

Griffiths D H, Riddihough R P, Cameron H A D, et al. Geophysical investigation of the Scotia arc[R]. London:British Antarctic Survey,1964:43.

Davey F J. Marine gravity measurements in Bransfield Strait and adjacent areas[C]//Antarctic Geology and Geophysics-Symposium on Antarctic Geology and Solid Earth Geophysics Antarctic Geology and Geophysics. Oslo:Universitetsforlaget, 1972:39-45.

Elliot D H. Tectonic setting and evolution of the James Ross Basin, northern Antarctic Peninsula[J]. Geological Society of America Memoirs, 1988, 169:541-556.

Gràcia E, Canals M, Farràn M L, et al. Central and eastern Bransfield basins (Antarctica) from high-resolution swath-bathymetry data[J]. Antarctic Science, 1997, 9(2):168-180.

Gràcia E, Canals M, Farràn M L, et al. Morphostructure and evolution of the central and Eastern Bransfield Basins (NW Antarctic Peninsula)[J]. Marine Geophysical Researches, 1996, 18(2/4):429-448.

Barker D H N, Christeson G L, Austin J A, et al. Backarc basin evolution and cordilleran orogenesis:insights from new ocean-bottom seismograph refraction profiling in Bransfield Strait, Antarctica[J]. Geology, 2003, 31(2):107-110.

Schreider A A, Schreider A A, Evsenko E I. The stages of the development of the basin of the Bransfield Strait[J]. Oceanology, 2014, 54(3):365-373.

Schreider A A, Schreider A A, Galindo-Zaldivar J, et al. Structure of the Bransfield strait crust[J]. Oceanology, 2015, 55(1):112-123.

National Oceanic and Atmospheric Administration. NOAA-NESDIS-NCEI(formerly GDC)-Maps-Trackline Gephysical Data[EB/OL].[2016-12-01]. http://maps.ngdc.noaa.gov/viewers/geophysics/.

马龙, 郑彦鹏, 裴彦良, 等. 南极布兰斯菲尔德海峡船测重力资料平差处理[J]. 海洋科学进展, 2015, 33(3):403-413. Ma Long, Zheng Yanpeng, Pei Yanliang, et al. The adjustment of shipborne gravimetric data for the Bransfield Strait[J]. Advances in Marine Science, 2015, 33(3):403-413.

黄漠涛,翟国君,欧阳永忠,等. 海洋重力测量误差补偿两步处理法[J]. 武汉大学学报:信息科学版, 2002, 27(3):251-255. Huang Motao, Zhai Guojun, Ouyang Yongzhong, et al. Two step processing for compensating the systematic errors in marine gravity measurements[J]. Geomatics and Information Science of Wuhan University, 2002, 27(3):251-255.

刘晨光,刘保华,郑彦鹏,等.海洋重磁资料的最小二乘平差处理方法[J]. 海洋科学进展, 2005, 23(4):513-517. Liu Chengguang, Liu Baohua, Zheng Yanpeng, et al. Least square adjustment method for processing marine gravity and geomagnetic data[J]. Advances in Marine Science, 2005, 23(4):513-517.

高金耀,张涛,谭勇华,等. 不规则重磁测线网误差模型的约束最小二乘平差[J]. 海洋测绘, 2006, 26(4):6-10. Gao Jinyao, Zhang Tao, Tan Yonghua, et al. Constraint least-square adjustment for marine gravity and magnetic track-line data in irregular survey network with arbitrary error model[J]. Hydrographic Surveying and Charting, 2006, 26(4):6-10.

Watts A B, Talwani M. Gravity anomalies seaward of deep-sea trenches and their tectonic implications[J]. Geophysical Journal of the Royal Astronomical Society, 2010,36(1):57-90.

Watts A B, Bodine J H, Steckler M S. Observations of flexure and the state of stress in the oceanic lithosphere[J]. Journal of Geophysical Research:Solid Earth, 1980, 85(B11):6369-6376.

Watts A B. An analysis of isostasy in the world's oceans 1. Hawaiian-Emperor Seamount Chain[J]. Journal of Geophysical Research:Solid Earth, 1978, 83(B12):5989-6004.

Parsons B, Molnar P. The origin of outer topographic rises associated with trenches[J]. Geophysical Journal of the Royal Astronomical Society, 2010, 1(4):707-712.

Caldwell J G, Turcotte D L. Dependence of the thickness of the elastic oceanic lithosphere on age[J]. Journal of Geophysical Research:Solid Earth, 1979, 84(B13):7572-7576.

Forsyth D W. Subsurface loading and estimates of the flexural rigidity of continental lithosphere[J]. Journal of Geophysical Research:Solid Earth, 1985, 90(B14):12623-12632.

Gunn R. A quantitative study of the lithosphere and gravity anomalies along the Atlantic coast[J]. Journal of the Franklin Institute, 1944, 237(2):139-154.

Keen C E. Thermal history and subsidence of rifted continental margins-evidence from wells on the Nova Scotian and Labrador shelves[J]. Canadian Journal of Earth Sciences, 1979, 16(3):505-522.

Watts A B, Steckler M S. Subsidence and tectonics of Atlantic type continental margins[J]. Oceanologica Acta, 1981(S):143-153.

Ashcroft W A. Crustal Structure of the South Shetland Islands and Bransfield Strait[M]. London:British Antarctic Survey, 1972,No.66.

Kaban M K, Schwintzer P, Reigber C. A new isostatic model of the lithosphere and gravity field[J]. Journal of Geodesy, 2004, 78(6):368-385.

Simpson R W, Jachens R C, Blakely R J. Airyroot:a Fortran program for calculating the gravitational attraction of an Airy isostatic root out to 166.7 km[R]. U.S.G.S. Open-File Report 83-883,1983:66.

Simpson R W, Jachens R C, Blakely R J, et al. A new isostatic residual gravity map of the conterminous United States with a discussion on the significance of isostatic residual anomalies[J]. Journal of Geophysical Research:Solid Earth (1978-2012), 1986, 91(B8):8348-8372.

曾华霖.重力场与重力勘探[M]. 北京:地质出版社,2005. Zeng Hualin. Gravity Field and Gravity Exploration[M]. Beijing:Geological Publishing House, 2005.

Grad M, Guterch A, Sroda P. Upper crustal structure of Deception Island area, Bransfield Strait, West Antarctica[J]. Antarctic Science, 1992, 4(4):469-476.

Lawver L A, Sloan B J, Barker D H N, et al. Distributed, active extension in Bransfield Basin, Antarctic Peninsula:evidence from multibeam bathymetry[J]. GSA Today, 1996, 6(11):1-6.

Barker D H N, Austin J A. Rift propagation, detachment faulting, and associated magmatism in Bransfield Strait, Antarctic Peninsula[J]. Journal of Geophysical Research:Solid Earth (1978-2012), 1998, 103(B10):24017-24043.

Keller R A, Fisk M R, Smellie J L, et al. Geochemistry of back arc basin volcanism in Bransfield Strait, Antarctica:Subducted contributions and along-axis variations[J]. Journal of Geophysical Research:Solid Earth (1978-2012), 2002, 107(B8):ECV 4-1-ECV 4-17.

Grad M, Shiobara H, Janik T, et al. Crustal model of the Bransfield Rift, West Antarctica, from detailed OBS refraction experiments[J]. Geophysical Journal International, 1997, 130(2):506-518.

Christeson G L, Barker D H N, Austin J A, et al. Deep crustal structure of Bransfield Strait:Initiation of a back arc basin by rift reactivation and propagation[J]. Journal of Geophysical Research:Solid Earth (1978-2012), 2003, 108(B10):2492.