A study of the distribution characteristics of basin tectonic units based on gravity data in Madagascar and its adjacent basins
Xue-Fa WANG1,2,3(), Wan-Yin WANG1,2,3(), Jie MA1,2,3, Min YANG1,2,3,4, Jian-She LIANG5, Chun-Guang QIU5, Ding-Ding WANG1,2,3, Xiao-Lin JI1,2,3, Jin-Lan LIU1,2,3
1. Insititute of Gravity and Magnetic Technology,Chang’an University,Xi’an 710054,China 2. College of Geology Engineering and Geomatics,Chang’an University,Xi’an 710054,China 3. Key Laboratory of Western China’s Mineral Resources and Geological Engineering,Ministry of Education,Chang’an University,Xi’an 710054,China 4. Department of Earth Sciences,Memorial University of Newfoundland,St.Johns’,A1B3X5,Canada 5. Cnooc Research Institute Limited,Beijing 100027,China
With offering the increasing opening exploration of oil and gas resources to the oversea exploration companies in Africa which remains in an early exploration stage, a good opportunity is provided for the companies in China. In this study, the gravity data of this research area were collected in order to study the tectonic characteristics of Malagasy Island, which has insufficient oil and gas geological data but abundant mineral resources. The faults and the boundaries of this basin were identified according to the response of the gravity anomaly to the sediments by the separation method of the minimum curvature, the vertical derivative of the normalized total horizontal derivative (NVDR-THDR) and the inversion of the depth of the curvature attribute, with Bouguer gravity anomaly. The geological and geophysical characteristics of the main faults were analyzed, and the distribution characteristics of faults and basins were determined, which were based on the geological and geophysical data. According to this research, there are 9 primary faults and 11 secondary faults inferred in this study area trending NNE, NE and nearly NS. The tectonics of Tamatave Basin, Morondava Basin and Majunga Basin were re-divided into 7 depressions and 3 uplifts combined with the distribution of faults from this study and previous studies, which are shown as a zonal distribution like "two depressions with one uplift". This research can provide geophysical information for exploration of oil, gas and mineral resources in Madagascar and its adjacent regions.
王学发, 王万银, 马杰, 杨敏, 梁建设, 邱春光, 王丁丁, 纪晓琳, 刘金兰. 基于重力资料的马达加斯加岛及邻区盆地构造单元分布特征[J]. 物探与化探, 2020, 44(4): 928-937.
Xue-Fa WANG, Wan-Yin WANG, Jie MA, Min YANG, Jian-She LIANG, Chun-Guang QIU, Ding-Ding WANG, Xiao-Lin JI, Jin-Lan LIU. A study of the distribution characteristics of basin tectonic units based on gravity data in Madagascar and its adjacent basins. Geophysical and Geochemical Exploration, 2020, 44(4): 928-937.
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