HYDROTHERMAL ACTIVITY AND METALLOGENESIS IN THE LAU BACK-ARC BASIN

被引:159
作者
FOUQUET, Y
VONSTACKELBERG, U
CHARLOU, JL
DONVAL, JP
ERZINGER, J
FOUCHER, JP
HERZIG, P
MUHE, R
SOAKAI, S
WIEDICKE, M
WHITECHURCH, H
机构
[1] BUNDESANSTALT GEWISSENSCH & ROHSTOFFE,W-3000 HANNOVER 51,GERMANY
[2] UNIV GIESSEN,INST GEOWISSENSCH,W-6300 GIESSEN,GERMANY
[3] RHEIN WESTFAL TH AACHEN,INST MINERAL & LAGERSTATTENLEHRE,W-5100 AACHEN,GERMANY
[4] MINIST LANDS SURVEY & NAT RESOURCES,NUKUALOFA,TONGA
[5] ECOLE & OBSERV PHYS GLOBE STRASBOURG,F-67084 STRASBOURG,FRANCE
[6] UNIV KIEL,INST GEOL,W-2300 KIEL 1,GERMANY
关键词
D O I
10.1038/349778a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
IN 1989, the submersible Nautile discovered one of the most active hydrothermal fields on the modern ocean floor, in the Lau back-arc basin (Fig. 1). The field contains high-temperature white and black smokers, and as we report here, its characteristics contrast strongly with those of the hydrothermal fields found at normal mid-ocean ridges. The main differences are the acidity (pH as low as 2), chemistry and temperature (up to 400-degrees-C) of the hydrothermal fluids, the composition of the ore deposits, and the volcanic and tectonic environments. The fluids also have very high concentrations of trace metals, and primary gold is present in the accompanying mineral deposits. Our data show that these back-arc deposits in the Lau Basin are intermediate between typical mid-ocean-ridge mineralization and massive sulphide deposits of the Kuroko type.
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页码:778 / 781
页数:4
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