Long-Term Evolution of Nontransform Discontinuities at the Mid-Atlantic Ridge, 24 degrees N-27 degrees 30 ' N
文献类型：期刊论文
| 作者 | Zheng, Tingting; Tucholke, Brian E.; Lin, Jian |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2019 |
| 卷号 | 124期号:10页码:10023 |
| 关键词 | Mid-Atlantic Ridge nontransform discontinuity plate reconstruction propagating rift |
| DOI | 10.1029/2019JB017648 |
| 英文摘要 | We studied long-term evolution of nontransform discontinuities (NTDs) on the Mid-Atlantic Ridge from 0- to similar to 20- to 25-Ma crust using plate reconstructions of multibeam bathymetry, long-range HMR1 sidescan sonar, residual mantle Bouguer gravity anomaly (RMBA), and gravity-derived crustal thickness. NTDs have propagated north and south with respect to flowlines of relative plate motion and both rapidly and slowly compared to the half spreading rate; at times they have been quasi-stable. Fast, short-term (<2 Myr) propagation is driven by reduced magma supply (increased tectonic extension) in the propagating ridge tip when NTD ridge-axis offsets are small (less than or similar to 5 km). Propagation at larger offsets generally is slower and longer term. These NTDs can show classic structures of rift propagation including inner and outer pseudofaults and crustal blocks transferred between ridge flanks by discontinuous jumps of the propagating ridge tip. In all cases crustal transfer occurs within the NTD valley. Aside from ridge-axis offset, the evolution of NTDs appears to be controlled by three factors: (1) gross volume and distribution of magma supplied to ridge segments as controlled by 3-D heterogeneities in mantle fertility and/or dynamic upwelling; this controls fundamental ridge segmentation. (2) The lithospheric plumbing system through which magma is delivered to the crust. (3) The consequent focusing of tectonic extension in magma-poor parts of spreading segments, typically at segment ends, which can drive propagation. We also observe long-wavelength (5-10 Myr) RMBA asymmetry between the conjugate ridge flanks, and we attribute this to asymmetric distribution of density anomalies in the upper mantle. |
| 资助机构 | National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [91628301, 41890813, U1606401]; Chinese Academy of SciencesChinese Academy of Sciences [Y4SL021001, QYZDY-SSW-DQC005, 133244KYSB20180029]; Chinese National 985 Project [1350141509]; International Exchange Program for Graduate Students of Tongji University [2016020006]; China Scholarship CouncilChina Scholarship Council [201706260034]; Office of Naval ResearchOffice of Naval Research [N00014-90-J-6121]; U.S. National Science FoundationNational Science Foundation (NSF) [OCE-9503561]; Woods Hole Oceanographic Institution ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [91628301, 41890813, U1606401]; Chinese Academy of SciencesChinese Academy of Sciences [Y4SL021001, QYZDY-SSW-DQC005, 133244KYSB20180029]; Chinese National 985 Project [1350141509]; International Exchange Program for Graduate Students of Tongji University [2016020006]; China Scholarship CouncilChina Scholarship Council [201706260034]; Office of Naval ResearchOffice of Naval Research [N00014-90-J-6121]; U.S. National Science FoundationNational Science Foundation (NSF) [OCE-9503561]; Woods Hole Oceanographic Institution |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18260]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 推荐引用方式 GB/T 7714 | Zheng, Tingting,Tucholke, Brian E.,Lin, Jian. Long-Term Evolution of Nontransform Discontinuities at the Mid-Atlantic Ridge, 24 degrees N-27 degrees 30 ' N[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2019,124(10):10023, 10055. |
| APA | Zheng, Tingting,Tucholke, Brian E.,&Lin, Jian.(2019).Long-Term Evolution of Nontransform Discontinuities at the Mid-Atlantic Ridge, 24 degrees N-27 degrees 30 ' N.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,124(10),10023. |
| MLA | Zheng, Tingting,et al."Long-Term Evolution of Nontransform Discontinuities at the Mid-Atlantic Ridge, 24 degrees N-27 degrees 30 ' N".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 124.10(2019):10023. |
入库方式： OAI收割
来源：南海海洋研究所
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