意大利那不勒斯坎皮弗莱格雷火山群莫费特和圣维托地热区的矿石成矿作用

IF 3.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Journal of Geochemical Exploration Pub Date : 2024-07-26 DOI:10.1016/j.gexplo.2024.107556
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引用次数: 0

摘要

莫菲特和圣维托地热田位于意大利那不勒斯以西,是坎皮弗莱格雷火山群的一部分。20 世纪 70 年代,人们钻探了深度约为 3000 米的探井,试图找到高焓流体,用于潜在的电力生产。Mofete 井(MF1、MF2 和 MF5)和 San Vito 井(SV1 和 SV3)的钻探岩芯样本含有自生矿化物。黄铁矿、黄铁矿和方铅矿含量丰富。黄铜矿、闪锌矿、砷黄铁矿和白钨矿较少见;千枚岩、辉钼矿、原生铋、碲铋矿、锡石、辉钼矿和尖晶石较罕见。矿物化学成分是通过电子显微镜波长色散光谱法和配备能量色散光谱仪的扫描电子显微镜测定的。矿物组合表明硫化环境较低,MF1 井和 SV1 井上部没有黄铁矿,表明硫活动不稳定。在 SV1-2860 和 SV3-2353 样品中发现了辉钼矿和白钨矿,SV3 井中的白钨矿呈带状分布,Mo6+ 含量可变;Mo6+ 含量低的区域显示蓝色阴极发光,而 Mo6+ 含量高的区域呈黄色至棕色。白钨矿的分带和两种含钼矿物的出现证明了地热流体中ƒO2和ƒS2的可变性。
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Ore mineralization in the Mofete and San Vito geothermal fields, Campi Flegrei volcanic complex, Naples, Italy

The Mofete and San Vito geothermal fields, located west of Naples, Italy, are part of the Campi Flegrei volcanic complex. In the 1970s, exploratory wells were drilled to a depth of ~3000 m in an attempt to locate high-enthalpy fluids for potential power production. Drill core samples from Mofete wells (MF1, MF2, and MF5) and from San Vito wells (SV1 and SV3) contain authigenic ore mineralization. Pyrite, pyrrhotite, and galena are abundant. Less common are chalcopyrite, sphalerite, arsenopyrite, and scheelite; rare are millerite, violarite, native bismuth, tellurobismuthite, cassiterite, molybdenite, and acanthite. Mineral chemistry was determined by electron microprobe wavelength dispersive spectroscopy aided by a scanning electron microscope equipped with energy-dispersive spectroscopy. The mineral assemblage suggests a low sulfidation environment and the absence of pyrrhotite in the MF1 well and upper part of the SV1 well indicates variable sulfur activity. Both molybdenite and scheelite were identified in samples SV1–2860 and SV3–2353 and scheelite in the SV3 well is zoned with variable Mo6+ content; low Mo6+ zones show blue cathodoluminescence, whereas, zones with high Mo6+ content are yellow to brown. Zoned scheelite and the occurrence of both Mo-bearing minerals attest to the variability of ƒO2 and ƒS2 in the geothermal fluid.

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来源期刊
Journal of Geochemical Exploration
Journal of Geochemical Exploration 地学-地球化学与地球物理
CiteScore
7.40
自引率
7.70%
发文量
148
审稿时长
8.1 months
期刊介绍: Journal of Geochemical Exploration is mostly dedicated to publication of original studies in exploration and environmental geochemistry and related topics. Contributions considered of prevalent interest for the journal include researches based on the application of innovative methods to: define the genesis and the evolution of mineral deposits including transfer of elements in large-scale mineralized areas. analyze complex systems at the boundaries between bio-geochemistry, metal transport and mineral accumulation. evaluate effects of historical mining activities on the surface environment. trace pollutant sources and define their fate and transport models in the near-surface and surface environments involving solid, fluid and aerial matrices. assess and quantify natural and technogenic radioactivity in the environment. determine geochemical anomalies and set baseline reference values using compositional data analysis, multivariate statistics and geo-spatial analysis. assess the impacts of anthropogenic contamination on ecosystems and human health at local and regional scale to prioritize and classify risks through deterministic and stochastic approaches. Papers dedicated to the presentation of newly developed methods in analytical geochemistry to be applied in the field or in laboratory are also within the topics of interest for the journal.
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