Regional characteristics and Moho depth for the Ross Sea, Antarctic

Ma Long; Zheng Yanpeng

doi:10.3969/j.issn.0253-4193.2020.01.015

Volume 42 Issue 1

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Ma Long，Zheng Yanpeng. Regional characteristics and Moho depth for the Ross Sea, Antarctic[J]. Haiyang Xuebao，2020, 42(1)：144–153，doi:10.3969/j.issn.0253−4193.2020.01.015

Citation:

Ma Long，Zheng Yanpeng. Regional characteristics and Moho depth for the Ross Sea, Antarctic[J]. Haiyang Xuebao，2020, 42(1)：144–153，doi:10.3969/j.issn.0253−4193.2020.01.015

Citation:

Ma Long，Zheng Yanpeng. Regional characteristics and Moho depth for the Ross Sea, Antarctic[J]. Haiyang Xuebao，2020, 42(1)：144–153，doi:10.3969/j.issn.0253−4193.2020.01.015

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Regional characteristics and Moho depth for the Ross Sea, Antarctic

doi: 10.3969/j.issn.0253-4193.2020.01.015

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

Received Date: 2019-03-27
Rev Recd Date: 2019-11-01

Available Online: 2021-04-21

Publish Date: 2020-01-25

Abstract

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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References

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