Large along-axis variations in magma supply and tectonism of the Southeast Indian Ridge near the Australian-Antarctic Discordance
文献类型：期刊论文
| 作者 | Liu, Shoujin3; Lin, Jian2; Zhou, Zhiyuan4; Zhang, Fan4 |
| 刊名 | ACTA OCEANOLOGICA SINICA
 |
| 出版日期 | 2020 |
| 卷号 | 39期号:1页码:118 |
| 关键词 | Oceanic Core Complexes magma supply Southeast Indian Ridge lithospheric deformation Australian-Antarctic Discordance |
| ISSN号 | 1869-1099 |
| DOI | 10.1007/s13131-019-1518-z |
| 英文摘要 | We analyzed seafloor morphology and geophysical anomalies of the Southeast Indian Ridge (SEIR) to reveal the remarkable changes in magma supply along this intermediate fast-spreading ridge. We found systematic differences of the Australian-Antarctic Discordance (AAD) from adjacent ridge segments with the residual mantle Bouguer gravity anomaly (RMBA) being more positive, seafloor being deeper, morphology being more chaotic, M factors being smaller at the AAD. These systematic anomalies, as well as the observed Na-8.0 being greater and Fe-8.0 being smaller at AAD, suggest relatively starved magma supply and relatively thin crust within the AAD. Comparing to the adjacent ridges segments, the calculated average map-view M factors are relatively small for the AAD, where several Oceanic Core Complexes (OCCs) develop. Close to 30 OCCs were found to be distributed asymmetrically along the SEIR with 60% of OCCs at the northern flank. The OCCs are concentrated mainly in Segments B3 and B4 within the AAD at similar to 124 degrees-126 degrees E, as well as at the eastern end of Zone C at similar to 115 degrees E. The relatively small map-view M factors within the AAD indicate stronger tectonism than the adjacent SEIR segments. The interaction between the westward migrating Pacific mantle and the relatively cold mantle beneath the AAD may have caused a reduction in magma supply, leading to the development of abundant OCCs. |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18592]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, Guangzhou 523936, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China 4.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA |
| 推荐引用方式 GB/T 7714 | Liu, Shoujin,Lin, Jian,Zhou, Zhiyuan,et al. Large along-axis variations in magma supply and tectonism of the Southeast Indian Ridge near the Australian-Antarctic Discordance[J]. ACTA OCEANOLOGICA SINICA,2020,39(1):118, 129. |
| APA | Liu, Shoujin,Lin, Jian,Zhou, Zhiyuan,&Zhang, Fan.(2020).Large along-axis variations in magma supply and tectonism of the Southeast Indian Ridge near the Australian-Antarctic Discordance.ACTA OCEANOLOGICA SINICA,39(1),118. |
| MLA | Liu, Shoujin,et al."Large along-axis variations in magma supply and tectonism of the Southeast Indian Ridge near the Australian-Antarctic Discordance".ACTA OCEANOLOGICA SINICA 39.1(2020):118. |
入库方式： OAI收割
来源：南海海洋研究所
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