Anche Paleobeppe vicino ai ghiacciai in Val di Rhemes!

E’ una lista infinita quella di studenti e studentesse che mi hanno dato grandissime soddisfazioni durante la mia vita universitaria da non studente…
Uno di questi è certamente Paleobeppe (Giuseppe Marramà) che in questi giorni ha pubblicato delle sue foto e mi ha permesso di utilizzarle per spiegare cos’è l’esarazione glaciale.

Le mani di Paleobeppe indicano la direzione del flusso glaciale sui solchi provocati dall'esarazione ad opera di ciotoli e massi trascinati al fondo
Le mani di Paleobeppe indicano la direzione del flusso glaciale sui solchi provocati dall’esarazione ad opera di ciotoli e massi trascinati al fondo

Il ghiacciaio, abbiamo già detto nei precedenti post e video (glaciologia su scienzafacile.it), è dinamico e si muove come un fiume al rallentatore realizzando una moltitudine di morfologie.

Il ghiacciaio, durante il suo movimento, trasporta detriti, ciotoli, enormi massi, sabbia, ghiaia e limo. Li trasporta anche sul fondo e con essi segna il suo percorso. Sasso su sasso compressi dal peso del ghiaccio, possono restare impressi nelle rocce alla base del flusso questi segni che vediamo in fotografia.

Paleobeppe, avvezzo ai fossili (con questo nome poi…!!!) è però anche un Geologo e questi segni non gli sono sfuggiti! Sono stati ripresi in alta Val di Rhemes e la cosa ha potuto solo farmi enorme piacere.

Sapete già che è un luogo che amo! Sono passato tante volte dove il ghiacciaio ha lasciato i suoi segni ma non avevo mai la macchina fotografica.

Oggi Paleobeppe ci fa questo regalo!

Paleobeppe si è messo anche ad imitare l’antico ghiacciaio nel suo lento e inesorabile movimento verso valle e mi ha ricordato che si può fare  scienza anche divertendosi e scherzando un po’!!! Grazie Giuseppe!

…guardate qui:

Paleobeppe mostra la direzione del flusso glaciale sulle rocce in posto soggette all'esarazione glaciale
Paleobeppe mostra la direzione del flusso glaciale sulle rocce in posto soggette all’esarazione glaciale

Oggi il ritiro dei ghiacciai ci permette di vedere in diretta ma più che altro in anteprima le dinamiche in corso e di comprendere ancor meglio quel che è successo in passato quando enormi calotte glaciali si svilupparono sulle Alpi in Nord Europa, Nord e Sud America…

Siamo fortunati?

Mah! Chissa?

Io la gradirei una nuova Piccola Età glaciale! Solo una piccola glaciazione…

Si tratterebbe solo di avere due o tre gradi in meno di media, un po’ più di neve in inverno ed estati relativamente fresche…

 

Un commento su “Anche Paleobeppe vicino ai ghiacciai in Val di Rhemes!”

  1. Un infinito grazie a Stefano per lo spazio che mi ha dedicato qui. Non credevo che una mia buffa foto potesse essere interessante per un articolo scientifico!! La prima foto invece mostra chiaramente ciò che hai riportato sull’articolo… Sono davvero bellissimi posti questi e ad ogni metro c’è sempre qualcosa di interessante da osservare da un punto di vista scientifico…in questo caso geologico! Spero allora durante le mie prossime escursioni di fare qualche altra foto che possa illustrare i vari argomenti trattati qui…
    A presto e complimenti ancora per il blog!!!!

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