Lava flow layer‐East Pacific Rise
作者:
Thomas J. Herron,
期刊:
Geophysical Research Letters
(WILEY Available online 1982)
卷期:
Volume 9,
issue 1
页码: 17-20
ISSN:0094-8276
年代: 1982
DOI:10.1029/GL009i001p00017
数据来源: WILEY
摘要:
A multichannel seismic reflection profile across the East Pacific Rise near 9°N reveals an approximately 400 m thick layer at the top of the oceanic crust with seismic velocity of about 2.8 km/s at the Rise crest. This velocity increases to about 3.8 km/s, 210 km east of the Rise crest. These low velocities suggest that this layer is probably a porous lava flow layer (layer 2A of seismic refraction studies) generated by volcanic activity at the spreading center. Reflections from the base of the layer imply a relatively sharp transition between the lava flows and the underlying layer (presumably a sheeted dike complex). The underlying layer is a zone about 1.4 km thick (with velocity about 5.7 km/s) whose base may coincide with the top of a low velocity magma chamber from which the crust develops
点击下载:
PDF
(404KB)
返 回