SHRIMP U-Pb zircon dating on Nyainqentanglha granite in central Lhasa block  被引量:11

SHRIMP U-Pb zircon dating on Nyainqentanglha granite in central Lhasa block

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作  者:LIUQisheng WUZhenhan HUDaogong YEPeisheng JIANGWan WANGYanbin ZHANGHancheng 

机构地区:[1]InstituteofGeomechanics,InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing100081,China [2]BeijingSHRIMPCenter,InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing100037,China [3]ChinaUniversityofGeosciences,Beijing100083,China

出  处:《Chinese Science Bulletin》2004年第1期76-82,共7页

摘  要:The Nyainqentanglha granite, a batholith with an area of 1500 km^2 in the central Lhasa block, comprises mainly medium-fine-grained biotite monzonitic granite and medium-coarse-grained biotite monzonitic granite. Their contact relationship suggests that the medlum-fine-grained biotite monzonitic granite was crystallized earlier than the medium-coarse-grained monzonitic granite. A SHRIMP U-Pb dating on zircons from representative samples of the batholith shows that the crystallization age of the medium-fine-grained biotite monzonitic granite is 18.3 Ma and that of the medium-coarse-grained monzonitic granite is 11.01 Ma. The emplacement and crystallization of the Nyainqentanglha granite, the youngest granite batholith ever known inside the Lhasa block, have a close relationship with the collisional orogeny, crustal thickening, plateau uplifting,E-W crustal extension and have a dynamic genetic relationship with the crustal partial melting.The Nyainqentanglha granite, a batholith with an area of 1500 km2 in the central Lhasa block, comprises mainly medium-fine-grained biotite monzonitic granite and medium-coarse-grained biotite monzonitic granite. Their contact relationship suggests that the medium-fine-grained biotite monzonitic granite was crystallized earlier than the medium-coarse-grained monzonitic granite. A SHRIMP U-Pb dating on zircons from representative samples of the batholith shows that the crystallization age of the medium-fine-grained biotite monzonitic granite is 18.3 Ma and that of the medium-coarse-grained monzonitic granite is 11.01 Ma. The emplacement and crystallization of the Nyainqentanglha granite, the youngest granite batholith ever known inside the Lhasa block, have a close relationship with the collisional orogeny, crustal thickening, plateau uplifting, E-W crustal extension and have a dynamic genetic relationship with the crustal partial melting.

关 键 词:锆石 花岗岩 拉萨 青藏高原 

分 类 号:P619.222[天文地球—矿床学] P578.941[天文地球—地质学]

 

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