岩石矿物学杂志2024，Vol.43Issue(4)：905-917,13.DOI:10.20086/j.cnki.yskw.2024.0408
江陵凹陷西南部始新世盐湖卤水演化和钾锂来源
The evolution of Eocene saline lake brine and sources of K and Li in the southwestern Jiangling depression:Evidence from fluid inclusion of halite
摘要
Abstract
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.关键词
江陵凹陷/石盐原生流体包裹体/钾石盐沉积/岩盐溶解Key words
Jiangling depression/primary fluid inclusion of halite/sylvite precipitation/dissolution of halite分类
天文与地球科学引用本文复制引用
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..江陵凹陷西南部始新世盐湖卤水演化和钾锂来源[J].岩石矿物学杂志,2024,43(4):905-917,13.基金项目
国家重点研发计划(2023YFC2906605) （2023YFC2906605）
国家自然科学基金(U20A2092,41502089) （U20A2092,41502089）
中国地质调查局地质调查项目(DD20230056,DD20190437,DD20190606) （DD20230056,DD20190437,DD20190606）
中央级公益性科研院所基本科研业务费专项(KK2005,KK2016) National Key Research and Development Project of China(2023YFC2906605) （KK2005,KK2016）
National Natural Science Foundation of China(U20A2092,41502089) （U20A2092,41502089）
Project of China Geological Survey(DD20230056,DD20190437,DD20190606) （DD20230056,DD20190437,DD20190606）
Central Welfare Basic Scientific Research Business Expenses(KK2005,KK2016) （KK2005,KK2016）
