Alfonso Garcia Caballero, Author at PROMETHEUS

A morphogram for silica-witherite biomorphs and its application to microfossil identification in the early earth rock record

Posted on April 19, 2018April 19, 2018 by Alfonso Garcia Caballero

Rouillard, J.; Garcia-Ruiz, J. M.; Gong, J.; van Zuilen, M. A., A morphogram for silica-witherite biomorphs and its application to microfossil identification in the early earth rock record. Geobiology 2018. Download paper. Archean hydrothermal environments formed a likely site for the origin and early evolution of life. These are also the settings, however, were complex abiologic structures can form. Low-temperature serpentinization of ultramafic crust can generate alkaline, silica-saturated fluids in which carbonate-silica crystalline aggregates with…

Structural Transition of Inorganic Silica-Carbonate Composites Towards Curved Lifelike Morphologies

Posted on April 19, 2018April 19, 2018 by Alfonso Garcia Caballero

Opel, J.; Kellermeier, M.; Sickinger, A.; Morales, J.; Coelfen, H.; Garcia-Ruiz, J.-M., Structural Transition of Inorganic Silica-Carbonate Composites Towards Curved Lifelike Morphologies. Minerals 2018, 8 (2). Download paper. The self-assembly of alkaline earth carbonates in the presence of silica at high pH leads to a unique class of composite materials displaying a broad variety of self-assembled superstructures with complex morphologies. A detailed understanding of the formation process of these purely inorganic architectures is crucial for…

Sampling Lake Natron

Posted on April 2, 2018 by Alfonso Garcia Caballero

Magadi Secondary School

Posted on April 2, 2018 by Alfonso Garcia Caballero

Beautiful day in the surroundings of Lake Natron

Posted on March 26, 2018 by Alfonso Garcia Caballero

Today we have experienced a beautiful day in the surroundings of Lake Natron, in Tanzania on the border with Kenya. We were able to sample there because it is Masai territory and with our guide Lucas Sozoika we didn’t need a passport. Lucas knows the terrain like the back of his hand because, among other things, he brings from Magadi the chlorine tablets that allow them to make the water of the Ewaso Ngi’ro River…

Marshland of Orgarua

Posted on March 26, 2018 by Alfonso Garcia Caballero

When the river Ewaso Ng’iro (Brown River) overflows, it creates a marshland in this idyllic place called Orgarua. The mountain on the left is the Shompole. Behind it, Tanzania. https://www.facebook.com/2077435265872724/photos/a.2077659872516930.1073741828.2077435265872724/2082536108695973/?type=3&theater

Conference at Magadi Public Secondary School for Masai boys and girls

Posted on March 26, 2018 by Alfonso Garcia Caballero

https://www.facebook.com/2077435265872724/videos/2081907558758828/

Lecture on Crystals by two students of the Nova School in Nairobi

Posted on March 26, 2018 by Alfonso Garcia Caballero

Two students of the Nova School in Nairobi made an excellent presentation of the lecture on Crystals. https://www.facebook.com/2077435265872724/videos/2081378855478365/

Ephemeral currents

Posted on March 22, 2018March 22, 2018 by Alfonso Garcia Caballero

Unlike Lake Natron, Lake Magadi has neither affluents nor effluents. There is no water current coming in or out. It rains a few hours a year. To catch one of those days when ephemeral currents are formed was a gift. https://www.facebook.com/2077435265872724/videos/2080411805575070/?t=28

Dinner after a long day of work

Posted on March 22, 2018 by Alfonso Garcia Caballero

Today, a special dinner to celebrate Javier’s birthday and the progress of his work with potato omelette (Gracias Martha). Ah! And candy bars.

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