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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