LIBS作为锂伟晶岩勘探和前景评价的工具：卡罗莱纳锡锂辉石带土壤云母和土壤分析

IF 3.4 3区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Applied Geochemistry Pub Date : 2025-08-25 DOI:10.1016/j.apgeochem.2025.106534

Russell S. Harmon , P. Louis Lu , Adam C. Curry , Russell M. Murray , Daniel D. Richter

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引用次数: 0

摘要

在通往高科技未来的道路上，锂是必不可少的元素。为了降低勘探成本，缩短发现和生产之间的时间，最大限度地减少勘探和生产对环境的影响，必须能够有效地勘探和充分评估前景。激光诱导击穿光谱（LIBS）是一种用于实验室和现场实时地球化学分析的分析技术，有可能提高当前李伟晶岩勘探和远景评价的能力。这项研究是在北卡罗来纳州加斯顿县卡罗莱纳锡锂辉石带的一部分进行的，这是美国最大的锂伟晶岩远景之一。手持式LIBS分析首次观察到土壤中单个云母颗粒的Li-K /Rb系统与贫瘠的石英长石和含锂辉石伟晶岩中的云母相同，这表明土壤云母分析可能用于矿化伟晶岩的地球化学指向。在坎哈普勒多残余土壤的Bt层中，Li、K和Rb的含量是在野外通过基质匹配LIBS校准确定的，这些校准沿着一个区域的五个样带进行，该区域的地下锂辉石辉晶岩岩脉从钻探中已知存在于~ 15 m深度。与云母的情况不同，土壤K和Rb丰度没有系统变化，K/Rb比值不能反映地下矿化的存在。相比之下，当采样样带直接经过锂辉石矿化岩脉时，土壤Li含量急剧上升。与其他山前平原和沿海平原土壤相比，在区域尺度上，卡罗莱纳锡锂辉石带伟晶岩成矿带的土壤Li丰度显著升高。因此，在局部和区域空间尺度的锂伟晶岩勘探中，利用LIBS进行快速土壤地球化学分析是有潜力的。

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LIBS as a tool for Li-pegmatite exploration and prospect evaluation: Soil mica and soil analysis from the Carolina Tin-Spodumene Belt

Lithium is an essential element along the pathway to a high-technology future. Being able to efficiently explore for Li deposits and fully assess prospects is necessary to reduce exploration costs, shorten time between discovery and production, and minimize environmental impacts of exploration and production. Laser-induced breakdown spectroscopy (LIBS) is an analytical technology for real-time geochemical analysis in both the laboratory and the field that has potential to enhance current capabilities for Li pegmatite exploration and prospect evaluation. This study was conducted in a portion of the Carolina Tin-Spodumene Belt in Gaston County, NC at one of the largest Li-pegmatite prospects in the USA. Analysis by handheld LIBS first observed the same Li–K/Rb systematics for individual mica grains in soil as for mica in both barren quartz-feldspar and spodumene-bearing pegmatites, suggesting that soil mica analysis might be used for geochemical vectoring towards mineralized pegmatite. The contents of Li, K, and Rb in Bt horizons of residual Kanhapludult soil were determined in the field from matrix-matched LIBS calibrations along five transects across an area where a subsurface spodumene pegmatite dike was known from drilling to be present at ∼15-m depth. Unlike the situation for mica, no systematic variation was observed for soil K and Rb abundances, with K/Rb ratios not reflective of the presence of subsurface mineralization. By contrast, soil Li content spiked sharply where a sampling transect passed directly over the spodumene mineralized dike. It was also noted that soil Li abundances are significantly elevated across the domain of the Carolina Tin-Spodumene Belt of pegmatite mineralization on a regional scale compared to other Piedmont and Coastal Plain soils. Thus, there is potential for rapid soil geochemical analysis by LIBS in Li-pegmatite exploration at both local and regional spatial scales.

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来源期刊

Applied Geochemistry 地学-地球化学与地球物理

CiteScore

6.10

自引率

8.80%

发文量

272

审稿时长

65 days

期刊介绍： Applied Geochemistry is an international journal devoted to publication of original research papers, rapid research communications and selected review papers in geochemistry and urban geochemistry which have some practical application to an aspect of human endeavour, such as the preservation of the environment, health, waste disposal and the search for resources. Papers on applications of inorganic, organic and isotope geochemistry and geochemical processes are therefore welcome provided they meet the main criterion. Spatial and temporal monitoring case studies are only of interest to our international readership if they present new ideas of broad application. Topics covered include: (1) Environmental geochemistry (including natural and anthropogenic aspects, and protection and remediation strategies); (2) Hydrogeochemistry (surface and groundwater); (3) Medical (urban) geochemistry; (4) The search for energy resources (in particular unconventional oil and gas or emerging metal resources); (5) Energy exploitation (in particular geothermal energy and CCS); (6) Upgrading of energy and mineral resources where there is a direct geochemical application; and (7) Waste disposal, including nuclear waste disposal.