the lhasa block 拉萨地块
It is generally accepted that there is a magmatic gap between ~40 Ma and 25 Ma in the Lhasa block,specially the Gangdese region,in respond to the hard collision between India and Asia plates after the breakoff of the Neo-Tethyan slab.
40~25 Ma之间通常被认为是拉萨地块特别是藏南冈底斯带岩浆活动的间歇期,与新特提斯洋板片断离后印度-亚洲大陆的硬碰撞有关。
参考来源 - 西藏冈底斯南缘冲木达约30Ma埃达克质侵入岩的成因:向北俯冲的印度陆壳的熔融?The Early Cretaceous OIB-type basalts near the Bonggong-Nujiang suture and the intermediate-acid volcanic rocks in the northern Lhasa block could be a consequence of the back-arc extension during the northward subduction of the Neo-Tethys.
早白垩世班公湖-怒江缝合带附近的OIB型玄武岩与拉萨地体北部的中酸性火山岩与新特提斯洋北向俯冲引起的弧后扩张有关。
参考来源 - 羌塘地体中生代构造演化:来自火山岩年代学、地球化学及同位素的证据·2,447,543篇论文数据,部分数据来源于NoteExpress
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