摘要
利用"大洋一号"首次环球科考获得的地球物理资料,通过对多波束地形和地磁异常的解译,对大西洋Logatchev热液区的地球物理场特征进行了研究,研究结果表明Logatchev热液喷口位于裂谷东侧的滑塌体上,处于南北地磁正负高值异常中心之间的缓冲带上,新发现的磁异常区与热液喷口区具有相似的特征,推测为未来的热液矿区。区内南西西-北东东和北-南向断裂不仅控制了基底深度和隆坳结构,也控制了超基性岩和热源磁性层的分布,因此它的形成与交叉切割的拆离断层、超基性岩、海洋核杂岩和重力滑塌有关。
Magnetic and multibeam data were collected from DAYANG No.1 first world cruise at Mid Atlantic Ridge.The interpretation of magnetic anomalies and bathymetric data shows the geophysical characteristics of hydrothermal plumes at the Logatchev vent field.Logatchev vent site is situated on the eastern inner flank of the rift valley and between the high value of positive and negative anomalies.NWW-SEE and NS trending fault not only control basement depth and upwelling-sag,but also dose the distribution of ultramafic rock and heat source.It is suggest that the Logatchev hydrothermal field is associated with ultramafic-hosted,off-axis location with detachment faulting,oceanic core complex,abundant gravitational landslides.
出处
《海洋学报》
CAS
CSCD
北大核心
2012年第1期120-126,共7页
基金
国家"九七三"项目(2007CB411703)
公益项目(200805078)
基本科研业务费专项资金项目(JG1007)
