榍石LA-ICP-MS U-Pb定年方法的评估及其对中喜马拉雅退变榴辉岩变质及深熔时代的限定-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

榍石LA-ICP-MS U-Pb定年方法的评估及其对中喜马拉雅退变榴辉岩变质及深熔时代的限定

Evaluation of in situ U-Pb dating method of titanite by LA-ICP-MS and its constraints on the metamorphic and anatectic ages of retrograded eclogites from the central Himalaya

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DOI	10.20086/j.cnki.yskw.2025.4091
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2025, 44(3)
作者	王淑真，张贵宾*，刘帅奇，熊璐，李楠，刘泽宇,
作者单位	北京大学地球与空间科学学院, 造山带与地壳演化教育部重点实验室, 北京 100871
摘要	榍石U-Pb年代学是目前研究变质演化、部分熔融等过程的重要手段。本文利用ThermoFisher Scientific iCapRQ激光剥蚀四级杆等离子体质谱仪,配套GeoLas HD 193 nm准分子激光剥蚀系统,评估了榍石U-Pb定年方法。通过评估剥蚀束斑、激光能量以及剥蚀频率对于榍石U-Pb体系分馏的影响,确定了适合本实验室的最佳仪器条件为5~8 J/cm²、5~8 Hz、44 μm,并且准确测定了3种榍石国际标样年龄 (BLR-1: 1 047±6 Ma; Ontario: 1 055±6 Ma; Pakistan: 21.0±0.6 Ma)。另外采用该系统对中喜马拉雅退变榴辉岩中榍石进行了U-Pb定年和微量元素分析。中喜马拉雅榴辉岩及深熔浅色体中的榍石可划分为两种类型,基质榴辉岩中为典型的变质榍石,而浅色体中的榍石为转熔成因榍石。中喜马拉雅退变榴辉岩变质榍石具有低含量的Nb、 Ta和Y但高的Nb/Ta值,3组变质榍石的U-Pb年龄分别为14.1±1.6 、14.2±0.4和15.3±2.5 Ma。榴辉岩中变质榍石通常以退变产物的形式出现,记录了变质冷却时代,结合榍石的Zr温度计(700~850℃),本研究认为在15~14 Ma中喜马拉雅榴辉岩已经退变至麻粒岩相-高角闪岩相。而转熔榍石中包含有熔体包裹体,并且其相对于变质榍石具有高含量的Th、Nb、Ta和REE和Th/U值但低的Nb/Ta值,U-Pb年龄为12.1±1.7 Ma,与浅色体锆石边部的年龄结果(13.5±0.9 Ma)一致,但明显晚于幔部变质锆石,指示中喜马拉雅榴辉岩在折返阶段发生了减压熔融。两种不同类型的榍石U-Pb定年结果和微量元素特征限定了中喜马拉雅榴辉岩15~14 Ma的麻粒岩相-高角闪岩相退变质时间和折返过程中约12 Ma的深熔时代。
Abstract	Titanite U-Pb dating is a significant way to investigate the geological processes such as metamorphism and partial melting. Here, we evaluate in situ titanite U-Pb dating method based on three well-known titanite standards (BLR-1, Ontario, Pakistan), using ThermoFisher Scientific iCapRQ quadrupole-inductively coupled plasma-mass spectrometer (Q-ICP-MS) coupled with 193 nm ArF excimer GeoLas HD laser-ablation system. After evaluating the influence of beam diameters, laser energy, and repetition rates on the U-Pb isotopic fractionation, the optimal instrumental conditions were confirmed at 5～8 J/cm²,5～8 Hz,44 μm. Besides, the titanite standards were accurately determined with ages of 1 047±6 Ma for BLR-1, 1 055±6 Ma for Ontario, 21.0±0.6 Ma for Pakistan. Further, we chose the granulitized eclogite and its partial melts from the central Himalaya for titanite U-Pb dating. Two types of titanite were recognized from the Himalayan granulitized eclogite and its partial melts, metamorphic type in eclogite and peritectic type in the leucosome. The metamorphic titanites in granulitized eclogites are characterized with lower Nb, Ta, Y but higher Nb/Ta. The U-Pb ages for three sets of metamorphic titanites are 14.1±1.6, 14.2±0.4 and 15.3±2.5 Ma. However, titanite commonly appears as the retrograded product and records the cooling age in eclogite, hence this study insists that granulitized eclogite from the central Himalaya has retrograded into granulite facies to high amphibolite facies at 15～14 Ma, combined with the Zr thermometer (700～850℃) of the titanite. The peritectic titanites with melt inclusions occurred are characterized with higher Th, Nb, Ta, REE and Th/U ratio but lower Nb/Ta ratio than the metamorphic type. Forty laser analyses for the peritectic titanite yield intercept ages of 12.1±1.7 Ma, consistent with the zircon rims (13.5±0.9 Ma) from the leucosome, but much younger than the zircon mantle (17.3±3.2 Ma), these results indicate eclogite from the central Himalaya has undergone decompression melting during the middle Miocene. Two different types of titanite U-Pb dating limit the retrograde metamorphism time of granulite facies to high amphibolite facies at 15～14 Ma and the partial melting age at about 12 Ma during the exhumation process.
关键词	变质榍石；转熔榍石；U-Pb定年；榴辉岩；中喜马拉雅
KeyWord	metamorphic titanite; peritectic titanite; U-Pb dating; eclogite; the central Himalaya
基金项目
页码	587-610

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王淑真，张贵宾*，刘帅奇，熊璐，李楠，刘泽宇. 榍石LA-ICP-MS U-Pb定年方法的评估及其对中喜马拉雅退变榴辉岩变质及深熔时代的限定 [J]. 岩石矿物学杂志. 2025; 44; (3). 587 - 610.

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