Anomalia magnetica di Temagami

L'anomalia magnetica di Temagami, chiamata anche l'anomalia di Temagami o l'anomalia di Wanapitei, è una grande struttura geologica sepolta, che si estende dall'isola Bear nel lago Temagami fino al lago Wanapitei a Ovest. L'anomalia magnetica è situata sullo scudo canadese nella regione di Temagami nel Nordest dell'Ontario, in Canada. Il territorio della Comunità aborigena di Teme-Augama Anishnabai è compreso parzialmente all'interno dell'anomalia magnetica di Temagami, incluso il suo territorio d'origine, l'isola Bear (Isola dell'Orso in italiano), situata nel lago Temagami.

Struttura

L'anomalia magnetica di Temagami ha il profilo di un uovo, è lunga 58 chilometri e larga 19 chilometri, è disposta lungo l'asse Est-Ovest e ha la larghezza maggiore nella sezione centrale. La parte occidentale sembra più regolare mentre la sezione orientale è lunga e stretta. L'anomalia magnetica di Temagami raggiunge circa 10 microtesla (il normale campo magnetico terrestre varia da 20 a 70 microtesla) rendendola una delle più grandi anomalie positive magnetiche del Nord America.[1]

Questa anomalia è stata scoperta nel corso di rilevamenti geofisici per la stesura di mappe magnetiche e gravitazionali. L'anomalia magnetica di Temagami ha notevoli somiglianze col vicino bacino di Sudbury, che è una delle zone minerarie più ricche della Terra, pertanto potrebbe essere anch'essa un cratere meteorico ricco di metalli come il cratere di Sudbury.[2]

Note

  1. ^ Pilkington, Mark (1997). 3-D Magnetic Imaging using Conjugate Gradients: Temagami anomaly Geophysics, Vol. 62, No. 4 (July–August 1997).
  2. ^ Temagami Magnetic Anomaly, retrieved on March 11, 2008.

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