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Analiza radioactiva a diamantelor din Jack Hills a aratat ca varsta lor variaza de la 3 miliarde si 60 milioane de ani (cele mai recente) la 4 miliarde si 250 milioane de ani (cele mai vechi). Diamantele se formeaza in conditii de presiune foarte inalta a rocii, de aceea, considera Martina Menneken, coordonatoare a cercetarilor, cu 4 miliarde si 250 milioane de ani in urma starea scoartei terestre trebuie sa fi fost deja destul de dura pentru a permite formarea unor astfel de geme.
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