沉积与特提斯地质2024，Vol.44Issue(4)：883-896,14.DOI:10.19826/j.cnki.1009-3850.2024.11008
喜马拉雅东构造结早中新世隆升:锆石和金红石U-Pb年龄约束
Early Miocene uplift of the eastern Himalayan syntaxis:Constraints from U-Pb ages of zircon and rutile
摘要
Abstract
Zircon and rutile U-Pb chronology of rocks from the eastern Himalayan syntaxis(EHS)were carried out to reveal the early uplift history of the EHS.The zircon U-Pb ages of two hornblendite samples are(34.0±0.2)Ma and(31.4±0.4)Ma,respectively.The rutile U-Pb ages are(23.8±0.9)Ma and(21.8±0.5)Ma,respectively.The rutile inclusions in the skarn garnet marble(with garnet as the host mineral)yield a U-Pb age of(19.5±0.7)Ma.Both zircon and rutile in the hornblendite are of magmatic origin,while the rutile inclusions are of metamorphic origin.We interpret the zircon age to represent the time of magma crystallization.While the ages of magmatic and metamorphic rutile represent the time of uplift and cooling after intrusion and crystallization.Comprehensive analyses show that the core of the EHS,surrounded by the Yarlung Tsangpo River,underwent significant uplift in the Early Miocene from 23 Ma to 19 Ma,and the uplift has accelerated since the Pliocene,from 5 Ma to 3 Ma.In addition,it is inferred that the EHS and the central Himalaya share a concurrent uplift history during the closure of Neotethys Ocean and the Early Miocene.关键词
喜马拉雅东构造结/隆升/锆石/金红石/U-Pb定年Key words
eastern Himalayan syntaxis/uplift/zircon/rutile/U-Pb dating分类
天文与地球科学引用本文复制引用
王冬兵,秦雅东,曾纪培,罗亮,唐渊,曾孝文,韩明明..喜马拉雅东构造结早中新世隆升:锆石和金红石U-Pb年龄约束[J].沉积与特提斯地质,2024,44(4):883-896,14.基金项目
中国地质调查局项目(DD20240026,DD20221811,DD20190053) （DD20240026,DD20221811,DD20190053）
国家自然科学基金项目(U2244226) （U2244226）
第二次青藏高原综合科学考察研究项目(2019QZKK0702) （2019QZKK0702）
