Mantle 3He in hydrothermal vents and plume of the Lucky Strike site (MAR 37°17′N) and associated geothermal heat flux

被引：50

作者：

Jean-Baptiste, P ^{[1
]}

Bougault, H

Vangriesheim, A

Charlou, JL

Radford-Knoery, J

Fouquet, Y

Needham, D

German, C

机构：

[1] CEA Saclay, LMCE, DSM, F-91191 Gif Sur Yvette, France

[2] IFREMER, Ctr Brest, F-29280 Plouzane, France

[3] SOC, Southampton SO14 3ZH, Hants, England

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 1998年 / 157卷 / 1-2期

关键词：

helium; hydrothermal vents; isotopes; heat flux; Mid-Atlantic Ridge;

D O I：

10.1016/S0012-821X(98)00022-3

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The helium isotopes composition of hydrothermal fluids at the Lucky Strike vent field has been determined by mass spectrometry. [He-4] end-member concentration is in the 1.2 x 10(-5)-2.6 x 10(-5) cm(3) STP/g range and the He-3/He-4 ratio, R, is 8.13 +/- 0.05 x R-a. The helium-3 budget over the active vent field was estimated from the He-3 mapping of the plume advected along the rift valley, using a 1-D advection box-model constrained with current velocity measurements. This leads to a He-3 flux of 2.3 x 10(-8) mol/s. The scaling of the heat flux from the Lucky Strike site to that of 3He, using the He-3/heat ratio measured in the hydrothermal fluids (5.2 x 10(-18)-7.7 x 10(-18) mol/J) allows an initial evaluation of the total geothermal heat output from the site, in the 3800 +/- 1200 MW range. This flux, of the same order as that of the Endeavour segment (han de Fuca Ridge), indicates the present high level of the hydrothermal activity in this section of the Mid-Atlantic Ridge. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：69 / 77

页数：9

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