부산대학교 도서관

In the Saltoro Hills of northern Ladakh, Shyok volcanics of the Shyok suture zone are dissected by a ~5 m wide granite intrusion. Such granitic intrusions, in the Shyok volcanics are more pronounced to the west of Udmaru village and could be observed for several hundred metres. The Cretaceous Shyok volcanics consist of basalts and andesites. U-Pb age data from separated zircon suggests that the crystallization age of this calc-alkaline granitic body is 24.52 ± 0.40 Ma. Younger granitic intrusion or body has not been reported earlier from the Shyok suture zone of northern Ladakh, however, the younger intrusive bodies ranging between 25 and 17 Ma have been recorded from the Baltoro and Tangtse-Mugalib plutonic unit of the Karakoram block. Therefore, it is most likely that the young post-collisional intrusive phase of the Shyok suture zone and the Karakoram block are similar and may be part of a common major late-to-posttectonic plutonic phase of the Karakoram batholith or they are related to the incipient synkinematic activity along the Karakoram fault. [ABSTRACT FROM AUTHOR]