北大别黄土岭长英质麻粒岩的原岩、变质作用及源区热事件年龄的锆石LA-ICPMS U-Pb测年约束

陈能松; 刘嵘; 孙敏; 李惠民; 何蕾; 王勤燕; 张宏飞

北大别黄土岭长英质麻粒岩的原岩、变质作用及源区热事件年龄的锆石LA-ICPMS U-Pb测年约束

陈能松^{1, 2,},
刘嵘¹,
孙敏³,
李惠民⁴,
何蕾¹,
王勤燕¹,
张宏飞²

1.
中国地质大学地球科学学院, 湖北武汉 430074
2.
中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074
3.
香港大学地球科学系
4.
天津地质矿产研究所, 天津 300170

基金项目:

高校博士点基金项目 98049114

国家自然科学基金项目 49972023

国家自然科学基金项目 40202008

中国地质大学地质过程与矿产资源国家重点实验室自由基金项目 MGMR2002-29

详细信息

作者简介:
陈能松(1956-), 男, 教授, 从事造山带变质作用过程和年代学研究. E-mail: nengsongchen@cug.edu.cn

中图分类号: P597
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出版历程
- 收稿日期: 2005-08-29
- 刊出日期: 2006-05-25

LA-ICPMS U-Pb Zircon Dating for Felsic Granulite, Huangtuling Area, North Dabieshan: Constraints on Timing of Its Protolith and Granulite-Facies Metamorphism, and Thermal Events in Its Provenance

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
3.
Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
4.
Institute of Geology and Mineral Resources of Tianjin, Tianjin 300170, China

摘要

摘要: 本研究应用激光剥蚀技术测定了北大别黄土岭高温-高压长英质麻粒岩锆石3个结构域的U-Pb年龄.变质锆石成因的碎屑锆石域的²⁰⁷Pb/²⁰⁶Pb年龄范围为(2493±54) Ma~(2500±180) Ma, 岩浆成因的碎屑锆石域的²⁰⁷Pb/²⁰⁶Pb年龄范围为2628~2690Ma, 其最大的²⁰⁶Pb/²³⁸U年龄为(2790±150) Ma, 变质增生或变质重结晶锆石域的不一致线上交点年龄为(2044.7±29.3) Ma.长英质麻粒岩的矿物组合成分、主量元素地球化学, 尤其是锆石副矿物内部结构特征显示其原岩为沉积岩.这表明, 麻粒岩原岩物质来自具有复杂热历史的蚀源区, 该蚀源区曾发生过~2.8Ga的岩浆作用和~2.5Ga变质作用, 因此其原岩的沉积年龄不应早于2.5Ga.高温-高压麻粒岩相变质作用的精确年龄为(2.04±0.03) Ga, 表明黄土岭麻粒岩是一个晚古元古代超高温变质岩之残块.
- 激光锆石U-Pb定年 /
- 原岩和麻粒岩相变质年龄 /
- 蚀源区 /
- 长英质麻粒岩 /
- 北大别.
Abstract: LA-ICPMS U-Pb dating was conducted on three textural domains in zircon from a high-temperature high-pressure felsic granulite in the Huangtuling area, North Dabieshan, Central China. The metamorphic growth-derived detrital zircon domain yielded a ²⁰⁷Pb/²⁰⁶Pb age in the range of (2 493±54) - (2 500±180) Ma. The magmatic genesis-derived detrital zircon domain gave a ²⁰⁷Pb/²⁰⁶Pb age ranging from 2 628 Ma to 2 690 Ma, with an oldest ²⁰⁶Pb/²³⁸U age of (2 790±150) Ma. The metamorphic overgrowth or metamorphic recrystallization zircon domain yielded a discordia with an upper intercept age of (2 044.7±29.3) Ma. Compositions of the mineral assemblage, major element geochemistry, and an especially complex interior texture of zircon suggest that the protolith of the felsic granulite is of sedimentary origin. The protolith material of the granulite came from a provenance with a complex thermal history, i.e. 2.8 Ga magmatism and 2.5 Ga metamorphism, and deposited in a basin not earlier than 2.5 Ga. The high-temperature and high-pressure granulite-facies metamorphic age was precisely constrained at (2.04±0.03) Ga, which indicates the granulite in Huangtuling area should be a relict of the Paleoproterozoic UHT metamorphosed slab.
- LA-ICPMS U-Pb zircon dating /
- ages of protolith and granulite-facies metamorphism /
- provenance /
- felsic granulite /
- North Dabieshan.

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图 1 大别造山带东段地质和构造单元简图(据Chen and Jahn, 1998; Wang et al., 1998; Hacker et al., 1998,略作修改)

UAF-GF.高角闪岩相-麻粒岩相带; LAF.低角闪岩相带; EAF.绿帘角闪岩相带

Fig. 1. Schetch geological map showing tectonic units in eastern Dabie orogen

下载: 全尺寸图片幻灯片

图 2 (al+fm)-(c+alk)-Si图解(Simonen, 1953)

Fig. 2. (al+fm)-(c+alk)-Si discrimination diagram

下载: 全尺寸图片幻灯片

图 3 长英质麻粒岩锆石阴极发光图像

Fig. 3. Cathodoluminescence images of zircons from the felsic granulite

下载: 全尺寸图片幻灯片

图 4 变质增生和变质重结晶锆石(Ⅲ域锆石) 的U-Pb年龄谐和图

图b是图a中椭圆区的放大

Fig. 4. Concordia diagram for metamorphic overgrowth or recrystallized zircons (domain Ⅲ zircons)

下载: 全尺寸图片幻灯片

表 1 黄土岭长英质麻粒岩岩石化学成分

Table 1. Petrochemical composition of the felsic granulite from Huangtuling

表 2 锆石U-Pb同位素分析和年龄计算结果

Table 2. U-Pb zircon dating and isotope analysis

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