Kaoline Mapping Using ASTER Satellite Imagery: The Case Study of Kefalos Peninsula, Kos Island

The present work aims to map kaolin occurrences on the Kefalos peninsula, SW Kos Island, Greece, through the elaboration of ASTER satellite imagery. The island of Kos is located on the eastern edge of the South Aegean Active Volcanic Arc (SAAVA) and is characterised by its complex geologic structure. During Plio-Pleistocene, the voluminous eruption of the Kos Plateau Tuff was recorded on Kefalos; the largest quaternary eruption in the Mediterranean. Kaolin is the product of hydrothermal alteration of the Pliocene volcanic rocks with rhyolitic composition. Our study emphasises the usefulness of satellite imagery combined with the Mixture Tuned Matched Filtering (MTMF) technique to detect occurrences of industrial minerals, kaolin-group minerals in this case, either in terms of raw mineral exploitation or by mapping hydrothermal alteration.

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NEW FIND OF ZUNYITE IN ADVANCED ARGILLIC ALTERATION OF RHYOLITES, KOS ISLAND, SOUTH AEGEAN VOLCANIC ARC , GREECE

Bulletin of the Geological Society of Greece ◽

10.12681/bgsg.16738 ◽

2004 ◽

Vol 36 (1) ◽

pp. 474 ◽

Cited By ~ 4

Author(s):

D. Papoulis ◽

P. Tsolis-Katagas ◽

C. Katagas

Keyword(s):

Raman Spectroscopy ◽

Hydrothermal Alteration ◽

Volcanic Rocks ◽

Hydrothermal Fluids ◽

Accessory Mineral ◽

Volcanic Arc ◽

Argillic Alteration ◽

Edx Analyses ◽

Advanced Argillic Alteration

Zunyite [Ali3SÌ5C>2o(OH,F)i8CI], an extremely rare mineral, was found as an accessory mineral in highly altered rhyolitic rocks at Kefalos, southwestern Kos, and in a completely kaolinized rhyolitic dyke at Asfendiou, northeastern Kos. It is associated with dickite, kaolinite, quartz and minor pyrophyllite. Kos Island contains both Tertiary and Quaternary volcanic rocks. Zunyite has been identified by XRD and studied by SEM, EDS, Raman spectroscopy and FTIR spectroscopy. The presence of zunyite, in the highly altered samples is significant for the determination of the conditions of the hydrothermal alteration that took place. Zunyite crystals, are up to 90 pm in diameter but usually are less than 10 pm; the crystals are partly covered by kaolinite layers. EDX analyses on the surface of zunyite revealed AI2O3/S1O2 values raging from 2.6 to 2.7. The occurrence of zunyite suggests incorporation of hydrothermal fluids rich in F" and CI", thus indicating contamination by seawater

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Geoeconomic Leverage of Natural Gas Resources in the Mediterranean

Contemporary Arab Affairs ◽

10.1525/caa.2019.12.4.141 ◽

2019 ◽

Vol 12 (4) ◽

pp. 141-155 ◽

Cited By ~ 1

Author(s):

Ahmed Mahdi

Keyword(s):

Natural Gas ◽

Economic Resources ◽

Tel Aviv ◽

Economic Influence ◽

The Mediterranean ◽

Influence Attempts ◽

Gas Fields

This article examines the claim that Israel’s natural gas exports from its Mediterranean gas fields will give geopolitical leverage to Tel Aviv over the importing countries. Using the geoeconomic tradition of Klaus Knorr and others who wrote about applying leverage using economic resources to gain geopolitical advantage, it is argued that certain criteria have to be satisfied for economic influence attempts, and that Israel’s gas exports do not satisfy these criteria. They include the importer’s supply vulnerability, the supplier’s demand vulnerability, and the salience of energy as an issue between both countries. Israeli gas exports to Egypt are used as a case study.

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The formation of the Egyptian Arabic dialect area

10.1093/oso/9780198701378.003.0003 ◽

2018 ◽

Author(s):

Peter Behnstedt ◽

Manfred Woidich

Keyword(s):

Mediterranean Coast ◽

External Factors ◽

Internal Factors ◽

Dialect Contact ◽

Historical Information ◽

Egyptian Arabic ◽

Transitional Area ◽

The Mediterranean

This chapter deals with the sedentary dialects of Egypt, excluding the bedouin dialects of Sinai and the Libyan bedouin dialects on the Mediterranean coast. It attempts to combine historical information on the settlement of Arabic tribes in Egypt with accounts of present-day Egyptian dialects and those of the regions from which those tribes came, initially Yemen and the Levant, later Hejaz, and then the Maghreb. The diversity of the Egyptian Arabic dialect area is partly explained by external factors, namely different layers of arabization over centuries. It is also explained by internal factors, namely dialect contact, which implies phenomena such as hyperdialectisms. Egypt is seen as a dialect area in its own right, but one that shows phenomena of a transitional area between the Arab East and West. A case study of Alexandria deals with dialect death. The role of substrata is discussed, but is considered negligible.

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