Santorini Island, Greece, spring 2019: Loumaravi

The oldest volcanic rocks on Santorini are found in the SW part of the island, in the area of Akrotiri (Loumaravi) complex and near the lighthouse (Cape Akrotiri). They consists dominantly of andesitic and dacitic domes and flows as well as large amounts of mostly fine-grained, silica-rich and bright-in-color submarine volcanic breccia and ashes. Hydrothermal alteration is common, leading to reddish and greenish secondary minerals in the tuffs.
A great way to observe these features is to take the beach shuttle boat from Akrotiri (opposite Nikolas Cave tavern) to the Black Beach via the Red and White Beaches.
Images taken during excursions on 11 and 17 May 2019.
Southern part of the Loumaravi complex under a stormy sky. (Photo: Tom Pfeiffer)
Southern part of the Loumaravi complex under a stormy sky. (Photo: Tom Pfeiffer) [info]
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Our tour guide and photographer Tobias Schorr collecting capers. (Photo: Tom Pfeiffer)
Our tour guide and photographer Tobias Schorr collecting capers. (Photo: Tom Pfeiffer) [info]
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Part of the old trail from Loumaravi's summit near Akrotiri to Agia Markella chapel near Kambia beach. (Photo: Tom Pfeiffer)
Part of the old trail from Loumaravi's summit near Akrotiri to Agia Markella chapel near Kambia beac... [info]
(85 Hits)
The area was once intensely being farmed. Old alonis (circular threshing places) witness of this past activity. (Photo: Tom Pfeiffer)
The area was once intensely being farmed. Old alonis (circular threshing places) witness of this pas... [info]
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In the lower part of the hills, a thick sequence of columnar jointed brown andesitic lavas is exposed, probably a shallow submarine intrusive or extrusive complex. (Photo: Tom Pfeiffer)
In the lower part of the hills, a thick sequence of columnar jointed brown andesitic lavas is expose... [info]
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Tobias studying the darker lavas. (Photo: Tom Pfeiffer)
Tobias studying the darker lavas. (Photo: Tom Pfeiffer) [info]
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Ancient pillow breccia, suggesting the extrusion took place underwater. (Photo: Tom Pfeiffer)
Ancient pillow breccia, suggesting the extrusion took place underwater. (Photo: Tom Pfeiffer) [info]
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The brown lavas are overlain by hydrothermally altered white to greenish volcanic tuff, inside which marine fossils can be found in many locations. (Photo: Tom Pfeiffer)
The brown lavas are overlain by hydrothermally altered white to greenish volcanic tuff, inside which... [info]
(66 Hits)
In the valley ending at Kambia beach, several lower hills are formed by irregular ridges of the andesitic intrusion. (Photo: Tom Pfeiffer)
In the valley ending at Kambia beach, several lower hills are formed by irregular ridges of the ande... [info]
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Much younger ash layers cover the surface in many areas. In this spot, the ash consists almost entirely of so-called accretionary lapilli - so-to-say fossil raindrops which once filtered volcanic ash out of the moist air by accretion to small balls up to 1 cm in diameter. (Photo: Tom Pfeiffer)
Much younger ash layers cover the surface in many areas. In this spot, the ash consists almost entir... [info]
(55 Hits)
Natural erosion has created many small caves in the sides of the hills, sometimes used as shelters for goats. (Photo: Tom Pfeiffer)
Natural erosion has created many small caves in the sides of the hills, sometimes used as shelters f... [info]
(58 Hits)
Some areas show strong hydrothermal alteration of rocks, as the presence of green clay minerals suggests. (Photo: Tom Pfeiffer)
Some areas show strong hydrothermal alteration of rocks, as the presence of green clay minerals sugg... [info]
(58 Hits)
Terraced hills (Photo: Tom Pfeiffer)
Terraced hills (Photo: Tom Pfeiffer) [info]
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Small chapel in the hillside. (Photo: Tom Pfeiffer)
Small chapel in the hillside. (Photo: Tom Pfeiffer) [info]
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Close-up of an old pillow lava structure. (Photo: Tom Pfeiffer)
Close-up of an old pillow lava structure. (Photo: Tom Pfeiffer) [info]
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The updomed Archangelos hill with Taxiachis chapel. (Photo: Tom Pfeiffer)
The updomed Archangelos hill with Taxiachis chapel. (Photo: Tom Pfeiffer) [info]
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The same rocks crop out at the sea cliff between Mesa Pigadia ("Black Beach") and Kambia beach. (Photo: Tom Pfeiffer)
The same rocks crop out at the sea cliff between Mesa Pigadia ("Black Beach") and Kambia beach. (Pho... [info]
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The intrusion (dark) and the partially altered white volcanic sediments. (Photo: Tom Pfeiffer)
The intrusion (dark) and the partially altered white volcanic sediments. (Photo: Tom Pfeiffer) [info]
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The cliffs are very colorful. (Photo: Tom Pfeiffer)
The cliffs are very colorful. (Photo: Tom Pfeiffer) [info]
(46 Hits)
Sea erosion created nice pillar-like structures. (Photo: Tom Pfeiffer)
Sea erosion created nice pillar-like structures. (Photo: Tom Pfeiffer) [info]
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The "White Beach". (Photo: Tom Pfeiffer)
The "White Beach". (Photo: Tom Pfeiffer) [info]
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Contact of the intrusive complex (dark) with the fine-grained sediments (bright). (Photo: Tom Pfeiffer)
Contact of the intrusive complex (dark) with the fine-grained sediments (bright). (Photo: Tom Pfeiff... [info]
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Columnar jointing is visible in some place on the upper surface of the intrusion where cooling of the lava in contact with the once overlying sediments initiated the formation of polygon-shaped cooling cracks. (Photo: Tom Pfeiffer)
Columnar jointing is visible in some place on the upper surface of the intrusion where cooling of th... [info]
(50 Hits)
Shuttle boat arriving at the Black Beach. (Photo: Tom Pfeiffer)
Shuttle boat arriving at the Black Beach. (Photo: Tom Pfeiffer) [info]
(44 Hits)
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