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首页> 外文期刊>Chinese science bulletin >SHRIMP U-Pb zircon dating on Nyainqentanglha granite in central Lhasa block
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SHRIMP U-Pb zircon dating on Nyainqentanglha granite in central Lhasa block

机译：拉萨中部Nyainqentanglha花岗岩上的SHRIMP U-Pb锆石约会

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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 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.
机译：Nyainqentanglha花岗岩是拉萨中部一块面积为1500 km〜2的岩溶岩基岩，主要包括中粒黑云母独居花岗岩和中粒黑云母独居花岗岩。他们的接触关系表明，中细粒黑云母单晶花岗岩的结晶要早于中粗粒单晶花岗岩。对来自“蝙蝠石”代表性样品的锆石进行的SHRIMP U-Pb测年表明，中细粒黑云母单晶花岗岩的结晶年龄为18.3 Ma，中粗粒岩单晶花岗岩的结晶年龄为11.01 Ma。拉萨地块内已知最年轻的花岗岩基岩Nyainqentanglha花岗岩的沉积和结晶与碰撞造山作用，地壳增厚，高原抬升，E-W地壳伸展密切相关，并且与地壳部分熔融具有动态遗传关系。

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