摘要
盐湖卤水型锂矿与富锂伟晶岩是目前最为主要的可利用锂资源,前者是经地表风化/高温水岩淋滤形成的水体通过蒸发作用浓缩而成的卤水,而后者被认为是陆表风化沉积物熔融产物经高演化形成的富锂硬岩。大陆地壳是此类表生物质循环最根本的物源,因而探究富锂地壳的形成及其表生风化剥蚀对于理解盐湖与伟晶岩锂成矿至关重要。本文将从元素循环视角切入,结合内生高温-外生低温过程中锂的元素地球化学行为,梳理锂在俯冲带各圈层的循环过程,探讨富锂地壳的形成机制及其对高原盐湖与造山带伟晶岩锂资源发育的影响。研究发现:(1)俯冲板片对弧岩浆锂的物质贡献有限;(2)厚地壳环境下的弧岩浆具有更高的锂含量;(3)造山带富锂弧岩石的循环应是盐湖与伟晶岩锂成矿的重要控制因素。
Continental brines and Li-enriched pegmatites are two primary lithium resources nowadays,with the former concentrated from streams derived from the weathering of subaerial crust or springs derived from the crust-fluid interaction in high temperature,and the latter highly fractionated from the crustal sediment-derived melts as Li-enriched hard rocks.Continental crust serves as the source rocks in both weathering scenarios.Exploring how Li-enriched continental crust grows and weathers is vital for a fundamental understanding of how lithium mineralizes in continental brines and pegmatites.From a perspective of elemental cycling in subduction zones,we first review lithium geochemical behaviors in both endogenous and exogenous geological processes.We further discuss the primary factors for lithium enrichment in arc magmas and the significance of Li-enriched arcs to the lithium mineralization of continental brines in plateau and pegmatites in orogen.Three conclusions are reached here:(1) Subduction contributes limited lithium input to arc magma;(2) Arc magma with thicker crust has higher lithium contents;(3) Cycling of Li-enriched arc rocks in orogen shall be a crucial step in the lithium mineralization in continental brine and pegmatite.
作者
陈晨
闫庆贺
章荣清
李庆宽
姜禾禾
刘海洋
秦占杰
张西营
孙卫东
CHEN Chen;Yan QingHe;ZHANG RongQing;LI QingKuan;JIANG HeHe;LIU HaiYang;QIN ZhanJie;ZHANG XiYing;SUN WeiDong(Center of Deep Sea Research,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China;School of Earth Sciences,Yunnan University,Kunming 650500,China;State Key Laboratory for Mineral Deposits Research,School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China;Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China;State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China)
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2024年第2期591-604,共14页
Acta Petrologica Sinica
基金
国家自然科学基金项目(42303042)
中国博士后科学基金(2022M710150)
地质过程与矿产资源国家重点实验室开放课题(GPMR202110)
中国科学院特别研究助理资助项目
青岛市博士后应用研究项目联合资助。
关键词
锂循环
盐湖
LCT伟晶岩
造山
地壳加厚
大陆风化
Lithium cycling
Lithium brine
LCT pegmatite
Orogeny
Crustal thickening
Continental weathering
