气候变化领域集成服务门户(CCPortal): Anhydrite-Assisted Hydrothermal Metal Transport to the Ocean Floor—Insights From Thermo-Hydro-Chemical Modeling

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DOI	10.1029/2019JB019035
	Anhydrite-Assisted Hydrothermal Metal Transport to the Ocean Floor—Insights From Thermo-Hydro-Chemical Modeling
	Guo Z.; Rüpke L.H.; Fuchs S.; Iyer K.; Hannington M.D.; Chen C.; Tao C.; Hasenclever J.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	High-temperature hydrothermal venting has been discovered on all modern mid-ocean ridges at all spreading rates. Although significant strides have been made in understanding the underlying processes that shape such systems, several first-order discrepancies between model predictions and observations remain. One key paradox is that numerical experiments consistently show entrainment of cold ambient seawater in shallow high permeability ocean crust causing a temperature drop that is difficult to reconcile with high vent temperatures. We investigate this conundrum using a thermo-hydro-chemical model that couples hydrothermal fluid flow with anhydrite- and pyrite-forming reactions in the shallow subseafloor. The models show that precipitation of anhydrite in warming seawater and in cooling hydrothermal fluids during mixing results in the formation of a chimney-like subseafloor structure around the upwelling, high-temperature plume. The establishment of such anhydrite-sealed zones reduces mixing between the hydrothermal fluid and seawater and results in an increase in vent temperature. Pyrite subsequently precipitates close to the seafloor within the anhydrite chimney. Although anhydrite thus formed may be dissolved when colder seawater circulates through the crust away from the spreading axis, the inside pyrite walls would be preserved as veins in present-day metal deposits, thereby preserving the history of hydrothermal circulation through shallow oceanic crust. ©2020. The Authors.
英文关键词	anhydrite; hydrothermal; numerical simulation; pyrite; thermo-hydro-chemical
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187772
作者单位	Key Laboratory of Submarine Geosciences, SOA, Second Institute of Oceanography, MNR, Hangzhou, China; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, China; Federal Institute for Geosciences and Natural Resources, Hannover, Germany; School of Oceanography, Shanghai Jiao Tong University, Shanghai, China; Institute of Geophysics, Hamburg University, Hamburg, Germany
推荐引用方式 GB/T 7714	Guo Z.,Rüpke L.H.,Fuchs S.,等. Anhydrite-Assisted Hydrothermal Metal Transport to the Ocean Floor—Insights From Thermo-Hydro-Chemical Modeling[J],2020,125(7).
APA	Guo Z..,Rüpke L.H..,Fuchs S..,Iyer K..,Hannington M.D..,...&Hasenclever J..(2020).Anhydrite-Assisted Hydrothermal Metal Transport to the Ocean Floor—Insights From Thermo-Hydro-Chemical Modeling.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Guo Z.,et al."Anhydrite-Assisted Hydrothermal Metal Transport to the Ocean Floor—Insights From Thermo-Hydro-Chemical Modeling".Journal of Geophysical Research: Solid Earth 125.7(2020).