首页|江陵凹陷西南部始新世盐湖卤水演化和钾锂来源——来自石盐流体包裹体的证据

江陵凹陷西南部始新世盐湖卤水演化和钾锂来源——来自石盐流体包裹体的证据

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
江陵凹陷中部和北部发现了富钾锂卤水的存在,而西南部地区则以不含钾锂的固体蒸发岩为主.本次研究旨在通过ZK0303井石盐流体包裹体中的化学成分来揭示凹陷西南部古盐湖卤水的演化和钾锂的来源.根据镜下观察,在始新世的3个石盐层中找到了具有人字形和堆积形的原生流体包裹体,并利用激光剥蚀电感耦合等离子体质谱仪(LA-ICP-MS)技术测试了石盐单个原生流体包裹体中Li、K、Mg、Ca、Br的浓度.通过实验数据的分析,凹陷西南部始新世石盐流体包裹体中卤水为Na-K-Mg-Ca-Cl型,其中K的浓度最高达到3 362.15 mg/L,Li的浓度最高达到15.10mg/L.ZK0303井3组石盐层中Mg-Ca-2K之间的关系表明,凹陷西南部盐湖卤水达到钾石盐沉积阶段.3个石盐组中各离子浓度的变化说明,盐湖卤水的蒸发程度经历了由低升高再降低的变化.根据前人的研究,卤水中钾锂的来源与凹陷内的玄武岩密切相关.但是凹陷西南部地区离玄武岩分布区较远难以获得足够的物质补给,该地区始新世盐湖卤水中的钾锂元素除蒸发外,还可能来源于早期岩盐的溶解.
The evolution of Eocene saline lake brine and sources of K and Li in the southwestern Jiangling depression:Evidence from fluid inclusion of halite
The potassium and lithium-rich brine is found in the central and northern part of Jiangling depression,while the southwest area is dominated by solid evaporites without potassium and lithium.This study aims to investi-gate the evolution of the paleo-saline lake brine in the southwestern Jiangling depression and sources of K and Li by the chemical composition of halite fluid inclusions of well ZK0303.Microscopic observations revealed the presence of primary fluid inclusions with chevron and cumulate structures in three groups of halite layers.The concentrations of Li,K,Mg,Ca,Br from the individual primary fluid inclusions were analyzed using laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS).According to the analysis of experimental data,the brine of Eo-cene halite fluid inclusion in the southwestern of the Jiangling depression is Na-K-Mg-Ca-Cl type,in which the highest concentration of K is 3 362.15 mg/L,and the highest concentration of Li is 15.10 mg/L.The relationship between Mg-Ca-2K of three halite layers in well ZK0303 shows that the brine of Eocene saline lake in the south-western depression reached the stage of sylvite precipitation.The changes of each ion concentration of the three halite layers show that the degree of evaporation of Eocene saline lake had changed from low to high and then de-creased.According to previous studies,the sources of Li and K in the brine are closely related to the basalt in the depression.However,the southwest area of the depression is far from the basalt distribution area,and it is difficult to obtain sufficient material supply.Lithium and K of the Eocene saline lake brine in this area may come from the dissolution of early halite in addition to evaporation.

Jiangling depressionprimary fluid inclusion of halitesylvite precipitationdissolution of halite

颜开、王春连、陈仁义、刘雪、刘延亭、尹传凯、孙珮婕、赵雨欣、廖世龙

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中国地质科学院矿产资源研究所,自然资源部成矿作用与资源评价重点实验室,北京 100037

冰岛大学地球科学学院,雷克雅未克102

昆明理工大学国土资源工程学院,云南昆明 650093

东华理工大学地球科学学院,江西南昌 330013

成都理工大学沉积地质研究院,四川成都 610059

长江大学地球物理与石油资源学院,湖北武汉 430100

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江陵凹陷 石盐原生流体包裹体 钾石盐沉积 岩盐溶解

国家重点研发计划国家自然科学基金国家自然科学基金中国地质调查局地质调查项目中国地质调查局地质调查项目中国地质调查局地质调查项目中央级公益性科研院所基本科研业务费专项中央级公益性科研院所基本科研业务费专项

2023YFC2906605U20A209241502089DD20230056DD20190437DD20190606KK2005KK2016

2024

10.20086/j.cnki.yskw.2024.0408

岩石矿物学杂志
中国地质学会岩石学专业委员会 矿物学专业委员会 中国地质科学院地质所

岩石矿物学杂志

CSTPCD北大核心
影响因子：1.104
ISSN：1000-6524
年,卷(期)：2024.43(4)