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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Mineralogical, geochemical and isotopic features of tuffs from the CFDDP drill hole: Hydrothermal activity in the eastern side of the Campi Flegrei volcano (southern Italy)
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Mineralogical, geochemical and isotopic features of tuffs from the CFDDP drill hole: Hydrothermal activity in the eastern side of the Campi Flegrei volcano (southern Italy)

机译：CFDDP钻孔凝灰岩的矿物学，地球化学和同位素特征：Campi Flegrei火山（意大利南部）东侧的热液活动

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摘要

A 506 m drill-hole has been recently drilled in the framework of the Campi Flegrei Deep Drilling Project (CFDDP) and the International Continental Scientific Drilling Program (ICDP) with the intention of coring the subsurface in the eastern sector of the Campi Flegrei caldera. The borehole, located in the western district of the Neapolitan city (Bagnoli Plain) 3 km to the east of the most active volcanic area and about 5 m above sea level, is now targeted for monitoring purposes. This paper reports the results obtained from the analysis of two short cores collected at depths of -443 and -506 m below the ground level. The cores sampled two pre-caldera tuffs. Observations performed by optical and scanning electron microscopy, energy dispersive spectroscopy and powder X-ray diffraction were used to achieve data on the primary lithology, both primary and secondary mineralogical assemblages, and the relationship between texture and secondary mineralization. Sr isotope ratios were determined on selected primary feldspars, whereas δ~(13)C and δ~(18)O analyses were performed on carbonates from veins and filled-voids in tuffs. Our results provide information on the hydrothermal system in the eastern sector of the caldera that was not among the goals in the previous drilling programs. Secondary mineralization suggests a saline hydrothermal environment characterized by fluids that progressively evolved from boiling toward more alkaline and cooler conditions. A paleo-temperature of ca. 160℃ has been inferred from authigenic mineral occurrences and calculated on the basis of equilibria between cored calcites and fluids presently emitted at the surface, by using carbon and oxygen isotope data. The temperature measured at the bottom of the drilling is about 80℃.
机译：最近在Campi Flegrei深度钻探项目（CFDDP）和国际大陆科学钻探计划（ICDP）的框架内钻了一个506 m的钻孔，目的是在Campi Flegrei破火山口的东部扇形地表下取心。该钻孔位于那不勒斯市西部地区（巴格诺利平原），距最活跃的火山区以东3公里，海拔约5 m，现在已成为监测的目标。本文报告了对两个短岩心的分析结果，这些短岩心是在地下-443和-506 m的深度处收集的。核心采样了两个破火山口前凝灰岩。通过光学和扫描电子显微镜，能量分散光谱和粉末X射线衍射进行的观察获得了有关主要岩性，主要和次要矿物学组合以及质地与次要矿化之间关系的数据。在选定的主要长石上确定了Sr同位素比，而对凝灰岩中的脉状碳酸盐和空洞中的碳酸盐进行了δ〜（13）C和δ〜（18）O分析。我们的结果提供了有关破火山口东部地区热液系统的信息，而以前的钻探计划并未将其作为目标。二次矿化表明存在盐分热液环境，其特征是流体从沸腾逐渐发展为更碱性和更凉爽的条件。的古温度约为根据自生矿物的存在推断出160℃，并利用碳和氧同位素数据，根据有核方解石与目前在地表排放的流体之间的平衡来计算。在钻探底部测得的温度约为80℃。

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