Hydrothermal Alteration Zones Detection in Limnos Island, Through the Application of Remote Sensing

Anifadi, A.; Parcharidis, Issaak; Sykioti, Olga

doi:10.12681/bgsg.11879

Cited by 5 publications

(6 citation statements)

References 11 publications

(6 reference statements)

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“…This fact shows that some of the artefacts moved slightly from their original position because of natural processes. The dune deposit, c. 70-cm thick, covers the fissured limestone and sandstone basements (Anifadi et al, 2016), which is typical of the geology of the area (Fig. 4,bottom).…”

Section: Agia Marinamentioning

confidence: 99%

Agia Marina and Peristereònas: Two New Epipalaeolithic Sites on the Island of Lemnos (Greece)

et al. 2022

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The surveys carried out along the coasts of the island of Lemnos (Greece) have led to the discovery of new Late Epipalaeolithic sites at Agia Marina and Peristereònas. Peristereònas yielded a knapped stone assemblage that is strictly comparable with that from Ouriakos, a site located along the south-eastern coast of the same island, while the artefacts from Agia Marina are more problematic to interpret because they are probably to be attributed to a slightly different period. However, the most characteristic artefacts recovered from the sites are represented by microlithic geometrics obtained by abrupt, bipolar, or direct retouch, end scrapers, and different types of exhausted cores and technical pieces, which help us reconstruct the operational sequence employed for the manufacture of the armatures. The aim of the paper is to contribute to the interpretation of the characteristics of the Late Epipalaeolithic assemblages discovered on the island and to frame them into the general picture of the end of the Pleistocene in this part of the Aegean. The artefacts from the sites show unique characteristics, without parallels to the knapped stone assemblages of the same period so far recovered along the coasts of the Aegean Sea, the eastern Mediterranean, the Levant, and the Black Sea.

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Section: Agia Marinamentioning

confidence: 99%

Agia Marina and Peristereònas: Two New Epipalaeolithic Sites on the Island of Lemnos (Greece)

et al. 2022

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“…The nearby Kondias Artificial Lake (W04; Figures 3 and 4) covering an area of 1,100,000 m 2 in the southeastern part of the island represents together with the Thanos reservoir the largest artificial water bodies on Lemnos [29], formed after the building of a soil dam in 1976. Moving northwards, Road Geo-Archaeo-Route 3 reaches the village of Sardes, where the Metal-Bearing Zone of Sardes (G08; Table 3, Figures 3 and 4), a system of quartz, has been developed in zones within the volcanic rocks and sandstones, in the same direction as that of the Fakos zones [118]. This interesting metal-bearing zone includes pyrite, marcasite and veinlets of silica [114].…”

Section: Road "Geo-archaeo-route" 1: Kotsinas-faraklo-gomatimentioning

confidence: 99%

“…Moving northwards, Road Geo-Archaeo-Route 3 reaches the village of Sardes, where the Metal-Bearing Zone of Sardes (G08; Table 3, Figures 3 and 4), a system of quartz, has been developed in zones within the volcanic rocks and sandstones, in the same direction as that of the Fakos zones [118]. This interesting metal-bearing zone includes pyrite, marcasite and veinlets of silica [114].…”

Section: Road "Geo-archaeo-route" 1: Kotsinas-faraklo-gomatimentioning

confidence: 99%

“Geo-Archaeo-Routes” on the Island of Lemnos: The “Nalture” Experience as a Holistic Geotouristic Approach within the Geoethical Perspective

Triantaphyllou,

Firkasis,

Tsourou

et al. 2023

Geosciences

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The geosites of Lemnos represent local touristic products that, beyond their high aesthetic value, display significant scientific links to the geological past as well as prehistory and history, archaeology, mythology and religious heritage of the island. The unique wealth of Lemnos geosites in combination with the abundance of archaeological sites, cultural monuments and museums composes the basis of what we define here as “Geo-Archaeo-Routes”: certain routes that can be geographically defined, offered, guided and finally followed by the touristic masses. The outcome of the performed quantitative Lemnos geosite assessment enables decision making, thus providing a toolbox useful for sustainable Geo-Archaeo-tourism development at a local level and forms the basis for designing “Geo-Archaeo-Routes”. “Geo-Archaeo-Routes” are particularly favorable of environmentally friendly alternative types of tourism, attracting naturalists, hikers, fans of cultural or religious tourism and many others who represent a major part of the touristic needs of the 21st century. The established hiking and road “Geo-Archaeo-Routes” on Lemnos Island may represent a distinctive touristic product as they offer a high level of “nalture” entertainment, blending “nature with culture” in the framework of a holistic geotouristic approach.

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“…A special case of SIs is represented by band ratios, where the ratio of two spectral bands is computed. Several SIs have been proposed using a range of wavelength combinations for mapping various mineral assemblages (Cloutis, 1996;Sabins, 1999;Cudahy and Hewson, 2002;Yamaguchi and Naito, 2003;Henrich et al, 2009;Shim et al, 2021), especially after the arrival of ASTER data with their SWIR spectral bands (Abrams et al, 1983;Abrams & Hook, 1995;Yamaguchi et al, 1998;Yamagushi & Naito, 2003;Kalinowski and Oliver, 2004;Gad and Kusky, 2007;Rajendran et al, 2011;Abrams et al, 2015;Ferrier et al 2016;Askari et al, 2018;Shuai et al, 2022) and/or Landsat 8 data (Anifadi et al, 2016;Ferrier et al 2016;Tompolidi et al, 2020;Anifadi et al, 2022;Sykioti et al 2022), spectral unmixing on (i) S-2, ASTER and Landsat 8 OLI data (Tompolidi et al, 2020) and (ii) EO-1 Hyperion hyperspectral data (Nikolakopoulos et al, 2007), Spectral Angle Mapping and Mixture-Tuned Matched…”

Section: Volume 59mentioning

confidence: 99%

Investigating the capability of Sentinel-2 and Worldview-3 VNIR satellite data to detect mineralized zones at an igneous intrusion in the Koutala islet (Lavreotiki, Greece) using laboratory mineralogical analysis, reflectance spectroscopy and spectral indices

et al. 2023

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During the last decades, the rapid progress of remote sensing data processing for their utilization in detecting locations of possible sites linked to hydrothermal alteration and ores has gained increasing attention due to significant time and cost savings. In this study, we present the findings of a joint remote sensing and laboratory examination of a mineralization zone induced by a granitoid intrusion onshore the islet of “Koutala”, in Lavreotiki, central Greece. Our objective is to investigate the potential of Sentinel-2 and WorldView-3 VNIR satellite data to detect and map oxidized ore zones and alteration minerals that are detected from laboratory analysis of samples and could be linked to Fe-Mn mineralization. Two approaches are followed, namely reflectance spectroscopy and spectral indices. In reflectance spectroscopy, the spectral signatures of all minerals detected in the study area are retrieved from spectral libraries. The signatures are resampled to Sentinel-2 and to WorldView-3 VNIR spectral bands. Continuum-removal is then applied and the diagnostic absorption features of each mineral are detected for each spectral band configuration. The dataset with the best spectral configuration for mineral detection is then used for the production of mineral maps using the corresponding satellite image. The second approach involves the calculation of spectral indices, namely ferric, ferrous iron and hydroxyl-bearing alteration, on reflectance spectra. The ferric iron index is applied to both satellite datasets while the two other indices require the use of SWIR bands and therefore, they can be only calculated on Sentinel-2 data. All results show that laboratory and satellite data analyses results are consistent and complementary. WorldView-3 VNIR data seem to be sensitive only to the ferric and manganese phase. Sentinel-2 data seem to be capable to detect and map all alteration minerals that are potentially linked to Fe-Mn ore, including both ferric and ferrous phases. The mineral absorption and spectral indices maps show that in the investigated area, there is significant mineralization related to the granitoid intrusion. Hydrothermal alteration is observed on the entire surface of the islet but it seems to be stronger at the eastern part of the islet where the granitoid/schist contact is located. It is the first time that (i) minerals linked to a potential Fe-Mn ore are detected on the islet and (b) the corresponding alteration mineral maps are produced from satellite data, revealing their spatial distribution and providing indirect estimations of the degree of their presence.

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Hydrothermal Alteration Zones Detection in Limnos Island, Through the Application of Remote Sensing

Cited by 5 publications

References 11 publications

Agia Marina and Peristereònas: Two New Epipalaeolithic Sites on the Island of Lemnos (Greece)

Agia Marina and Peristereònas: Two New Epipalaeolithic Sites on the Island of Lemnos (Greece)

“Geo-Archaeo-Routes” on the Island of Lemnos: The “Nalture” Experience as a Holistic Geotouristic Approach within the Geoethical Perspective

Investigating the capability of Sentinel-2 and Worldview-3 VNIR satellite data to detect mineralized zones at an igneous intrusion in the Koutala islet (Lavreotiki, Greece) using laboratory mineralogical analysis, reflectance spectroscopy and spectral indices

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