南极罗斯海重力场特征及莫霍面深度反演

马龙; 郑彦鹏

doi:10.3969/j.issn.0253-4193.2020.01.015

南极罗斯海重力场特征及莫霍面深度反演

doi: 10.3969/j.issn.0253-4193.2020.01.015

马龙^{1, 2, 3,},
郑彦鹏^{1, 3, ,}

1.
自然资源部第一海洋研究所海洋沉积与环境地质重点实验室，山东青岛 266061
2.
自然资源部海底矿产资源重点实验室，广东广州 510075
3.
青岛海洋科学与技术试点国家实验室海洋地质过程与环境功能实验室，山东青岛 266061

基金项目: 自然资源部海底矿产资源重点实验室开放基金(KLMMR-2018-B-01)；国家基金委−山东省联合基金项目(U1606401)；泰山学者攀登计划(tspd20161007)；极地科学战略研究基金(20120309)；国家青年基金(41606084)；南北极环境综合考察与评估专项(CHINARE2017-01-03-02，CHINARE2017-04-01-04)。

详细信息

作者简介:
马龙(1988—)，男，江西省九江市人，研究实习员，主要从事海洋地球物理方面研究。E-mail：malong@fio.org.cn

通讯作者:
郑彦鹏，研究员，主要从事海洋地球物理与海底构造方面研究。E-mail：zhengyp@fio.org.cn

中图分类号: P738.2
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出版历程
- 收稿日期: 2019-03-27
- 修回日期: 2019-11-01
- 网络出版日期: 2021-04-21
- 刊出日期: 2020-01-25

Regional characteristics and Moho depth for the Ross Sea, Antarctic

Ma Long^{1, 2, 3
,},
Zheng Yanpeng^{1, 3
, ,}

1.
Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Key Laboratory of Marine Mineral Resources, Ministry of Natural Resources, Guangzhou 510075, China
3.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China

摘要

摘要: 本文基于中国南极考察第30航次、第32航次所获得的实测重力资料，结合NGDC资料，开展12个航次重力场数据的平差融合工作，全部386个交点平差后标准差减小为±1.53×10⁻⁵ m/s²，与卫星重力差值平均值为1.49×10⁻⁵ m/s²，均方差为±3.81×10⁻⁵ m/s²，并在此基础上采用频率域界面反演法计算莫霍面深度。研究发现，与沉积盆地对应重力异常低值相悖，在罗斯海北部盆地、维多利亚地盆地、中央海槽、东部盆地4个主要盆地腹地却表现为重力异常高值，跨度达100 km以上。莫霍面深度分布整体呈南深北浅之势，范围为10～28 km。伴随着罗斯海西部盆地的多次拉张及岩浆活动，该区域的地壳厚度和莫霍面深度高值和低值相间分布，并表现出越来越大的差异性。综合剖面结果表明，罗斯海重力异常值的长波长变化与莫霍面的起伏呈正相关关系，但是反演的莫霍面深度与区域重力场特征并非完全对应，所以岩浆底侵和地壳侵入仍不足以导致罗斯海盆地的重力异常或盆地几何形状。
- 重力场特征 /
- 莫霍面深度 /
- 罗斯海 /
- 南极
Abstract: Based on the measured data in the 30th, 32th of Chinese National Antarctic Research Expedition, combined with the reference data, this study processed 12 groups of data in study area and draw the gravity anomaly map, with all 386 crossovers among these cruises the standard deviation reaching ±1.53×10⁻⁵ m/s². Compared to satellite gravity, the mean value of the difference is 1.49×10⁻⁵ m/s², with the standard deviation is ±3.81×10⁻⁵ m/s². On this basis, we used a frequency domain interface inversion method to calculate the Moho depth. It is contrary to sedimentary basins with low values of gravity anomaly, the gravity of the hinterland in the northern Ross Basin, the Victoria Basin, the Central Trough and the Eastern Basin is high, with a span of 100 km or more. The distribution of the Moho depth is generally high in the south and low in the north, ranging from 10 km to 28 km. Along with the multiple extensions and magmatism in the western part of the Ross Sea, the crustal thickness and Moho depth of the area show increasing differences, with interphase distribution of abnormal high and low values. Combining inverted depth of Moho and Gravity-Seismic inversion interpretation profile, we considered the long-wavelength variation of the gravity anomaly is positively correlated with the fluctuation of the Moho depth. However, the inversion Moho depth does not correspond exactly to the regional gravity field characteristics, so magma underplating and crustal intrusion are still insufficient to cause gravity anomalies or basin geometries in the Ross Sea Basin.
- regional gravity field /
- Moho depth /
- Ross Sea /
- Antarctic

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图 1 罗斯海海底地形

Fig. 1 Topographic map of the Ross Sea

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图 2 调查区测线分布

Fig. 2 Distribution of cruise data

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图 3 有效数据点分布

Fig. 3 Distribution of effective measuring points

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图 4 第30次南极船测重力数据与卫星重力数据对比

a. 测线剖面对比; b. 有效观测点差值分布

Fig. 4 Comparison in gravity anomaly by CHN30 measuring data and satellite data

a.Comparison of gravity profile; b. difference distribution of effective measuring points

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图 5 平差后数据分析

a. 船测数据平差后交点误差分布；b. 船测重力数据与卫星数据差值分布

Fig. 5 Histogram analysis of data after adjustment

a. Histogram of precision in crossover errors for shipborne data; b. difference distribution of ship-derived and satellite-deriver data

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图 6 罗斯海区域重力场特征（等值线间隔为10×10⁻⁵ m/s²）

Fig. 6 Regional gravity anomaly in the Ross Sea（the contour interval is 10×10⁻⁵ m/s²）

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图 7 莫霍面深度（火山组、断裂带分布据文献[10]）

Fig. 7 Depth of Moho（volcanic groups and fault modified after reference[10]）

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图 8 罗斯海地球物理综合剖面（修改自文献[30]）

Fig. 8 Gravity-seismic inversion interpretation profile in the Ross Sea (modified after reference [30])

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表 1 采用的罗斯海重力测线资料

Tab. 1 Gravity data for the Ross Sea used in this study

序号	航次	年份	测量仪器	月漂移/10⁻⁵m·s⁻²	出发港/返回港	数据来源
1	CHN30	2014年	L&R S型海洋重力仪	−2.98	中国极地科考码头/中国极地科考码头	实测数据
2	CHN32	2016年	L&R S型海洋重力仪	1.785	中国极地科考码头/中国极地科考码头	实测数据
3	ELT52	1972年	GSS-2型海洋重力仪	−	南极洲麦克默多站/新西兰利特尔顿港	文献[14]
4	ELT32	1967年	GSS-2型海洋重力仪	−	新西兰达尼丁港/新西兰惠灵顿港	文献[14]
5	I284AN	1984年	−	−	南极洲麦克默多站/新西兰利特尔顿港	文献[14]
6	NBP93-7	1993年	L&R S型海洋重力仪	−	蓬塔阿雷纳斯港/南极洲麦克默多站	文献[14]
7	NBP94-1	1994年	L&R S型海洋重力仪	0	南极洲麦克默多站/南极洲麦克默多站	文献[14]
8	NBP95-1	1995年	L&R S-36海洋重力仪	−	南极洲麦克默多站/新西兰利特尔顿港	文献[14]
9	NBP96-1	1996年	L&R S-36海洋重力仪	1.0	南极洲麦克默多站/南极洲麦克默多站	文献[14]
10	NBP0301	2003年	L&R S-36海洋重力仪	−	南极洲麦克默多站/南极洲麦克默多站	文献[14]
11	NBP0401	2004年	L&R S型海洋重力仪	−	南极洲麦克默多站/南极洲麦克默多站	文献[14]
12	RS8102	1981年	L&R S-80海洋重力仪	−	−	文献[14]
注：“−”代表NGDC未对测线的情况进行说明。

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表 2 密度模型

Tab. 2 Density model

	地层	密度/g·cm⁻³
库尔曼高地	上地壳	2.65
库尔曼高地	下地壳	2.92
中央高地	上地壳	2.70
中央高地	下地壳	2.92(存在密度异常体)
东部盆地	上地壳	2.73
东部盆地	下地壳	2.95

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