Osl dating of sediments from deserts in northern china america adult chat sites


23-Sep-2017 17:03

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Le lien entre les déserts du Tertiaire et les déserts actuels n’est en fait pas encore entièrement compris.

Dans les déserts du nord-ouest de la Chine, des sédiments lacustres et fluviaux d’âge pléistocène, ou même holocène, sont enfouis sous les dunes en de nombreux endroits, ce qui montre que les secteurs dunaires ont connu de brusques changements environnementaux pendant le Quaternaire supérieur.

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It generally occurs as a blanket deposit that covers areas of hundreds of square kilometers and tens of meters thick.

Loess often stands in either steep or vertical faces.

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Les déserts sont largement représentés dans le nord-ouest de la Chine où on les trouve à des altitudes allant de -155 m à plus de 5 000 m dans des contextes géomorphologiques et tectoniques variés.

Sediments derived from weathered sandstone were found to be brighter than those from metamorphosed schists, suggesting that sensitivity may be inherited from the source rock and its earlier sedimentary history.



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