Title: Zircon U-Pb Dating of Early Paleozoic Granites from the East Kunlun Mountains and Its Geological Significance
Abstract:Zircon U-Pb dating was conducted for four granite bodies in Wulonggou area by LA-MC-ICPMS.The mylonitized monzogranite(sample B20-14) from the middle of Huanglonggou yielded an average zircon U-Pb age...Zircon U-Pb dating was conducted for four granite bodies in Wulonggou area by LA-MC-ICPMS.The mylonitized monzogranite(sample B20-14) from the middle of Huanglonggou yielded an average zircon U-Pb age of(417.7±2.0) Ma,the mylonitized monzogranite(sample B21-2) from the upper part of Huanglonggou yielded an average zircon U-Pb age of(419.7±2.3) Ma,the middle-coarse grained monzogranite(sample B20-8) from Shenshuitan yielded an average zircon U-Pb age of(419.9±2.0) Ma,and the middle-coarse grained monzogranite(sample B25-9) from the middle of Hongqigou yielded an average zircon U-Pb age of(419.0±2.0) Ma.These ages should represent the formation epoch of the four granite bodies in Wulonggou area i.e.,Late Silurian,and thus record magmatic activities of the Early Paleozoic period.It is held that granites of the late Silurian period in Wulonggou area might have been concerned with the collisional orogeny after the closure of the Early Paleozoic Ocean.The discovery of 1861 Ma and 1666 Ma zircons of the Palaeoproterozoic epoch in the granite shows that the metamorphic basement materials of the East Kulun orogenic belt should be of Palaeoproterozoic period.Read More
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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Cited By Count: 28
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