On the global distribution of hydrothermal vent fields

被引:241
作者
Baker, ET [1 ]
German, CR [1 ]
机构
[1] NOAA, Pacific Marine Environm Lab, Seattle, WA 98115 USA
来源
MID-OCEAN RIDGES: HYDROTHERMAL INTERACTIONS BETWEEN THE LITHOSPHERE AND OCEANS | 2004年 / 148卷
关键词
D O I
10.1029/148GM10
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 "magmatic budget hypothesis" proposes that variability in magma supply is the primary control on the large-scale hydrothermal distribution pattern along oceanic spreading ridges. The concept is simple but several factors make testing the hypothesis complex: scant hydrothermal flux measurements, temporal lags between magmatic and hydrothermal processes, the role of permeability, nonmagmatic heat sources, and the uncertainties of vent-field exploration. Here we examine this hypothesis by summarizing our current state of knowledge of the global distribution of active vent fields, which presently number similar to280, roughly a quarter of our predicted population of similar to1000. Approximately 20% of the global ridge system has now been surveyed at least cursorily for active sites, but only half that length has been studied in sufficient detail for statistical treatment. Using I I ridge sections totaling 6140 km we find a robust linear correlation between either site frequency or hydrothermal plume incidence and the magmatic budget estimated from crustal thickness. These trends cover spreading rates of 10-150 mm/yr and strongly support the magma budget hypothesis. A secondary control, permeability, may, become,increasingly important as spreading rates decrease and deep faults mine supplemental heat from direct cooling of the upper mantle, cooling gabbroic,intrusions, and serpentinization of underlying ultramafics. Preliminary observations and theory suggest that hydrothermal activity on hotspot-affected ridges is relatively deficient, although paucity of data precludes generalizing this result. While the fullness of our conclusions depends upon further detailed study of vent field frequency, especially on slow-spreading ridges, they. are consistent with global distributions of deep-ocean He-3, an unequivocally magmatic tracer.
引用
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页码:245 / 266
页数:22
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