MD 143 / CHAMAK
Type | Oceanographic cruise |
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Ship | Marion Dufresne |
Ship owner | TAAF |
Dates | 22/09/2004 - 16/10/2004 |
Chief scientist(s) | ELLOUZ-ZIMMERMANN Nadine , LALLEMANT Siegfried |
INSTITUT FRANCAIS DU PETROLE ENERGIES NOUVELLES - RUEIL-MALMAISON 1-4 avenue du Bois Préau 92852 Rueil-Malmaison +33 (0)1 47.52.60.00 |
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DOI | 10.17600/4200250 |
Objective | Between the two large collision systems of Zagros (Iran) and the Himalaya (Pakistan-India), one of the oldest ocean crusts of the Indian subducts under the Eurasian blocks. This phenomenon of Indian and Arab plate subduction under Asia began at the start of the Tertiary, as shown by the formation of the volcanic arc at the border between Pakistan and Afghanistan. Significant historic earthquakes, like that of 1945, can be linked to these convergence movements. The Makran tectonic accretionary prism (stacks of thrust slices made up of sediments from the Indus) thus results in the subduction of ocean plates towards the north at an average speed which is currently 5 cm/year. Currently, 2/3 of the prism is emerged and can be studied on land, which makes this a unique example. In addition, the deformation front, where the most recent processes can be analyzed, is located at sea, off Pakistan. |