| 云南特提斯带保山-腾冲地块早古生代岩浆岩 |
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| 关键词:Yunnan Tethyan belt early Paleozoic magmatic rocks Gondwana |
| 基金项目:本文由国家自然科学基金委员会项目（编号：40372106)资助。 |
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| Early Paleozoic Magmatism in Baoshan-Tengchong Block of the Tethyan Belt, Yunnan Province |
| Western Yunnan belongs to one of the important branches of eastern Tethyan tectonic belt and therefore bears significance of eastern Tethyan belt. The Tengchong-Bacshan block is considered to be a part of the Sibumasu micro-continent, in which the basement of Gandwana affinity is exposed. Two granites sampled from the basement section yield U-Pb zircon ages of about 490 Ma, suggesting an early Paleozoic emplacement. In addition, parts of late Cretaceous granites having crustal origin contain inherited zircon cores giving around 500 Ma ages. Granite lenses of 486 Ma were also found in late Paleozoic melange of the Nan-Uttaradit zone suturing the Sibumasu and Indochina blocks. This early Paleozoic magmatism found in the Tengchong-Baoshan block and in neighboring areas implies a comparable history of the basements between Southeast Asia and western Tethyan belt in early Paleozoic. For exampie, the basements outcrop in the Alpine belt and probably in the European Variscides as well，which are also considered as continental blocks rifted from Gondwana prior to or simultaneously with those of Southeast Asia. |
| CHEN Fukun,Ll Qiuli,WANG Xiuli,LI Xianghui.2005.Early Paleozoic Magmatism in Baoshan-Tengchong Block of the Tethyan Belt, Yunnan Province[J].Acta Geoscientica Sinica,26(z1):93. |
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