FLUID-FLOW AND MASS FLUX DETERMINATIONS AT VENT SITES ON THE CASCADIA MARGIN ACCRETIONARY PRISM

被引：81

作者：

CARSON, B ^{[1
]}

SUESS, E ^{[1
]}

STRASSER, JC ^{[1
]}

机构：

[1] OREGON STATE UNIV, COLL OCEANOG, CORVALLIS, OR 97331 USA

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS | 1990年 / 95卷 / B6期

关键词：

D O I：

10.1029/JB095iB06p08891

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Fluid venting from the toe of the accretionary prism off Oregon was measured in situ during a series of dives with DSRV Alvin in 1987 and 1988. Calibrated flow meter measurements and flow rates determined from dissolved methane transfer indicate that discharge from two vent sites, Alvin 1428 and Alvin 1900, ranges roughly between 100 and 500L m-2d-1 with the most reliable estimates falling in the range of 125-150L m-2d-1. These rates imply subsurface advective flow on the order of 100m yr-1. Comparison of observed discharge rates with rates calculated for steady state expulsion supported by accretion-related compaction indicates that the observed flow is greater than predicted flow by several orders of magnitude. The disparity dictates that fluids are not derived locally, but are transported laterally within the prism, or that flow is not steady state and that individual vents are short-lived features in the ongoing accretion process. -from Authors

引用

页码：8891 / 8897

页数：7

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