...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Three-dimensional structure of the submarine flanks of La Reunion inferred from geophysical data
【24h】

Three-dimensional structure of the submarine flanks of La Reunion inferred from geophysical data

机译：地球物理数据推断留尼汪岛海底侧面的三维结构

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

La Reunion (Indian Ocean) constitutes a huge volcanic oceanic system of which most of the volume is submerged. We present a study of its submarine part based on the interpretation of magnetic and gravity data compiled from old and recent surveys. A model of the submarine internal structure is derived from 3-D and 2-D models using constraints from previous geological and geophysical studies. Two large-scale, previously unknown, buried volcanic construction zones are discovered in continuation of the island's construction. To the east, the Alizes submarine zone is interpreted as the remnants of Les Alizes volcano eastward flank whose center is marked by a large hypovolcanic intrusion complex. To the southwest, the Etang Sale submarine zone is interpreted as an extension of Piton des Neiges, probably fed by a volcanic rift zone over a large extent. They were predominantly built during the Matuyama period and thus probably belong to early volcanism. A correlation exists between their top and seismic horizons recognized in previous studies and interpreted as the base of the volcanic edifice. Their morphology suggested a lithospheric bulging beneath La Reunion, not required to explain our data, since the seismic interfaces match the top of our volcanic constructions. The coastal shelf coincides with a negative Bouguer anomaly belt, often associated with magnetic anomalies, suggesting a shelf built by hyaloclastites. A detailed analysis of the offshore continuation of La Montagne Massif to the north confirms this hypothesis. The gravity analysis confirms that the bathymetric bulges, forming the northern, eastern, southern, and western submarine flanks, are predominantly built by debris avalanche deposits at the surface.
机译：留尼汪岛（印度洋）构成了一个巨大的火山海洋系统，其中大部分被淹没。我们根据对旧的和最近的调查收集的磁和重力数据的解释，对潜艇部分进行了研究。利用以前的地质和地球物理研究的约束条件，从3-D和2-D模型中得出海底内部结构的模型。在该岛的建设过程中，发现了两个大规模的，以前未知的，埋在地下的火山构造区。在东部，Alizes海底带被解释为Les Alizes火山东侧的残留物，其中心的特征是大型的火山爆发侵入复合体。在西南地区，Etang Sale潜艇区被解释为Piton des Neiges的延伸，可能在很大程度上由火山裂谷带提供。它们主要是在Matuyama时期建造的，因此可能属于早期火山活动。它们的顶部和地震层位之间存在相关性，这在先前的研究中已被公认并被解释为火山岩的基础。他们的形态表明，在留尼汪岛（La Reunion）下面是岩石圈凸起，不需要解释我们的数据，因为地震界面与我们的火山构造顶部相匹配。沿海大陆架与负的布格异常带重合，通常与磁异常有关，表明该地区由透明质岩构成。对北部La Montagne Massif海上延伸的详细分析证实了这一假设。重力分析证实，形成北部，东部，南部和西部海底侧面的测深凸出物主要是由表面的碎屑雪崩沉积物构成的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号