Experimental study on water rock interactions at temperatures up to 435 degrees C and implications for geophysical features in upper mid-crust condition

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	Experimental study on water rock interactions at temperatures up to 435 degrees C and implications for geophysical features in upper mid-crust condition
	Zhang, RH (Zhang, Ronghua); Zhang, XT (Zhang, Xuetong); Hu, SM (Hu, Shumin)
刊名	TECTONOPHYSICS
	2011
卷号	502 期号:3-4 页码:276-292
关键词	Chemical kinetics Critical state Water rock interaction Middle crust High conductive-low velocity zone High temperature experiment
ISSN号	0040-1951
英文摘要	Globally observed zones of high conductivity and low seismic velocity in the mid-crust remain enigmatic despite previous theoretical and experimental investigations. We have carried out a series of dissolution experiments on mineral and rock samples in aqueous solutions using flow-through reactors at temperatures as high as 435 degrees C and at pressures of 23-36 MPa. These experiments provide useful information for evaluating the behavior of crustal fluids and their role in the formation of geophysical detectible anomalies in the mid-crust. The steady state dissolution rates of minerals or rocks are measured as functions of temperature, flow rate and pressure. The maximum release rates of Si for silicate minerals are always observed at 300 degrees C (or at 300-400 degrees C for silicate rocks), which results in strong leaching of Si and the break-up of silicate framework structures in minerals and rocks. From a tectonic perspective, plate motions are ultimately responsible for inducing cracking in rocks, generating porosity, decreasing pressure, and moving fluids across and through continents. These processes of decreasing pressure probably lead to the migration of aqueous fluid in the mid-crust to locations where they are close to their critical state at temperatures ranging from 300 to 435 degrees C. Therefore, water rock interactions occurring in the crust will cause strong leaching of Si, breakage of silicate framework structures, and rock collapse. The strong water-rock interaction will further lead to the generation of increased rock porosity and also drive fluid flow. These hydrothermal events, therefore, have a significant role in enhancing the conductivity of rocks in the mid-crust. (C) 2011 Elsevier B.V. All rights reserved.
学科主题	岩矿鉴定与测试
WOS关键词	SODIUM-CHLORIDE SOLUTIONS ; DIAMOND-ANVIL CELL ; SOUTHERN TIBET ; FLUID-FLOW ; DISSOLUTION KINETICS ; MASS-TRANSFER ; SUPERCRITICAL WATER ; CONTINENTAL-CRUST ; IR SPECTROSCOPY ; HIGH-PRESSURES
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000290507900002
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39316]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Mineral Resources, Lab Geochem Kinet, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Zhang, RH ,Zhang, XT ,Hu, SM . Experimental study on water rock interactions at temperatures up to 435 degrees C and implications for geophysical features in upper mid-crust condition[J]. TECTONOPHYSICS,2011,502(3-4):276-292.
APA	Zhang, RH ,Zhang, XT ,&Hu, SM .(2011).Experimental study on water rock interactions at temperatures up to 435 degrees C and implications for geophysical features in upper mid-crust condition.TECTONOPHYSICS,502(3-4),276-292.
MLA	Zhang, RH ,et al."Experimental study on water rock interactions at temperatures up to 435 degrees C and implications for geophysical features in upper mid-crust condition".TECTONOPHYSICS 502.3-4(2011):276-292.