Knowledge Resource Center for Ecological Environment in Arid Area
| Seafloor spreading in the eastern Gulf of Mexico: New evidence for marine magnetic anomalies | |
| Eskamani, Philip K. | |
| 出版年 | 2014 |
| 学位类型 | 硕士 |
| 导师 | Harry, Dennis |
| 学位授予单位 | Colorado State University |
| 英文摘要 | Possible sea-floor spreading anomalies are indentified in marine magnetic surveys conducted in the eastern Gulf of Mexico. A symmetric pattern of lineated anomalies can be correlated with the geomagnetic time scale using previously proposed opening histories for the Gulf of Mexico basin. Lineated magnetic anomalies are characterized by amplitudes of up to 30 nT and wavelengths of 45-55 km, and are correlatable across 12 different ship tracks spanning a combined distance of 6,712 km. The magnetic lineations are orientated in a NW-SE direction with 3 distinct positive lineations on either side of the inferred spreading ridge anomalies. The magnetic anomalies were forward modeled with a 2 km thick magnetic crust composed of vertically bounded blocks of normal and reverse polarity at a model source depth of 10 km. Remnant magnetization intensity and inclination are 1.6 A m-1 and 0.2° respectively, chosen to best fit the magnetic observed amplitudes and, for inclination, in accord with the nearly equatorial position of the Gulf of Mexico during Jurassic seafloor spreading. The current magnetic field is modeled with declination and inclination of and 0.65° and 20° respectively. Using a full seafloor spreading rate of 1.7 cm/yr, the anomalies correlate with magnetic chrons M21 to M10. The inferred spreading direction is consistent with previous suggestions of a North-East to South-West direction of sea-floor spreading off the west coast of Florida beginning 149 Ma (M21) and ending 134 Ma (M10). The opening direction is also consistent with the counter-clockwise rotation of Yucatan proposed in past models. |
| 英文关键词 | Gulf of mexico Marine magnetic anomalies Mexico Seafloor spreading |
| 语种 | 英语 |
| 国家 | United States |
| 来源学科分类 | Geology; Geophysics |
| URL | https://pqdtopen.proquest.com/doc/1616789727.html?FMT=AI |
| 来源机构 | Colorado State University |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/248142 |
| 推荐引用方式 GB/T 7714 | Eskamani, Philip K.. Seafloor spreading in the eastern Gulf of Mexico: New evidence for marine magnetic anomalies[D]. Colorado State University,2014. |
| 条目包含的文件 | 条目无相关文件。 | |||||
| 个性服务 |
| 推荐该条目 |
| 保存到收藏夹 |
| 导出为Endnote文件 |
| 谷歌学术 |
| 谷歌学术中相似的文章 |
| [Eskamani, Philip K.]的文章 |
| 百度学术 |
| 百度学术中相似的文章 |
| [Eskamani, Philip K.]的文章 |
| 必应学术 |
| 必应学术中相似的文章 |
| [Eskamani, Philip K.]的文章 |
| 相关权益政策 |
| 暂无数据 |
| 收藏/分享 |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
