Record of hydrothermal activity in the Yuhuang hydrothermal field and its implications for the Southwest Indian Ridge: evidence from sulfide chronology

被引:0
作者
Weifang Yang
Chunhui Tao
Shili Liao
Jin Liang
Wei Li
Teng Ding
Ágata Alveirinho Dias
Xuefeng Wang
Lisheng Wang
机构
[1] Ministry of Natural Resources,Key Laboratory of Submarine Geosciences, Second Institute of Oceanography
[2] Shanghai Jiaotong University,School of Oceanography
[3] Nanjing Normal University,School of Marine Science and Engineering
[4] University of Saint Joseph,Institute of Science and Environment
[5] Chinese Academy of Sciences,Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics
来源
Acta Oceanologica Sinica | 2023年 / 42卷
关键词
Southwest Indian Ridge; seafloor massive sulfides; Th/U dating; hydrothermal activity; mass accumulation;
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学科分类号
摘要
The Yuhuang hydrothermal field (YHF) is located between the Indomed and Gallieni fracture zones near the top of the off-axis slope on the south rift wall of Segment 29 on the ultraslow Southwest Indian Ridge (SWIR). Previous studies have shown that sulfides in the YHF formed during different mineralization episodes and the YHF has the greatest potential for the formation of large-scale seafloor massive sulfide deposits. However, the sulfide chronology and hydrothermal activity of the YHF remain poorly constrained. In this study, mineralogical analyses and 230Th/U dating were performed. Hydrothermal activity may start about (35.9 ± 2.3) ka from the southwest part of the YHF and may cease about (708 ± 81) a ago from the northeast part of the YHF. The 74 nonzero chronological data from hydrothermal sulfide samples provide the first quantitative characterization of the spatial and temporal history along the SWIR. Hydrothermal activity in the SWIR has been relatively active over the past 20 ka. In contrast, between 40 ka and 100 ka, hydrothermal activity was relatively infrequently and short in duration. The maximum activity occurred at 15–11 ka, 9–7 ka, 6–0.2 ka. There was a slight positive correlation between the maximal age and estimated surface area or estimated tonnage. The minimum mass accumulation rate of YHF is about 278 t/a, which is higher than most HFs related to ultramafic systems. The ultraslow spreading SWIR has the greatest potential to form large-scale seafloor massive sulfides (SMS) deposits. The results of this study provide new insights into the metallogenic mechanism of hydrothermal sulfides along ultraslow-spreading ridges.
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页码:59 / 68
页数:9
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