岩石矿物学杂志2018，Vol.37Issue(1)：128-142,15.
水-岩反应过程中的锂硼同位素分馏变化规律
Lithium-boron isotopic fractionation variation in the water-rock interaction process
摘要
Abstract
As an essential precondition of ore-forming process in the hydrothermal system,water-rock interaction is not only an important subject of metallogeny but also an international geological trend.This process is along with isotopic exchange,which changes the isotopic compositions of fluid and rock.As tracers of non-traditional stable isotopes,boron and lithium isotopes are often used to constrain fluid-basalt hydrothermal interaction process.This paper gives a detailed review of factors of boron and lithium isotopic fractionation variation,which include temperature,pH values,primary phase dissolution,surface exchange and secondary mineral formation.Some conclusions have been reached:① Generally,the fluids in equilibrium become more quickly enriched in 11B and end with higher δ11B;At low temperatures (＜ 150℃) Li is taken into secondary minerals and at high temperatures (＞200℃) it is leached from the rocks.② Primary phase dissolution and surface exchange hardly have influence upon lithium isotope fractionation.③ Usually,the heavier isotope 7Li preferentially goes into solution and finally the solution tends to be with higher δ7Li.Simulation of mass balance equilibrium of the evolution of isotopic compositions in the fluid and the bulk rock with the reaction progress was also made in this paper.关键词
水-岩反应/硼同位素/锂同位素/地球化学示踪工具Key words
water-rock interaction/boron isotope/lithium isotope/geochemical tracer分类
天文与地球科学引用本文复制引用
翁梅茂,杨丹..水-岩反应过程中的锂硼同位素分馏变化规律[J].岩石矿物学杂志,2018,37(1):128-142,15.基金项目
National Natural Science Foundation of China (41573038)国家自然科学基金面上基金(41573038) （41573038）
