造山带构造年代学基本问题&mdash;&mdash;论同位素体系与变质作用的关系

简平，杨巍然

doi:10.11867/j.issn.1001-8166.1998.05.0452

地球科学进展 >

1998 , Vol. 13 >Issue 5: 452 - 457

DOI: https://doi.org/10.11867/j.issn.1001-8166.1998.05.0452

干旱气候变化与可持续发展

造山带构造年代学基本问题——论同位素体系与变质作用的关系

展开

中国地质大学地球科学院武汉 430074

简平, 男, 1964 年 10 月生, 副研究员, 主要从事同位素地质年代学研究。

收稿日期: 1998-02-09

修回日期: 1998-04-14

网络出版日期: 1998-10-01

基金资助

国家自然科学基金项目"大别山中生代构造年代学"(项目编号:49572146)及地矿部壳幔体系组成、物质交换及动力学开放实验室基金资助。

收起

THE BASIC PROBLEMS OF TECTONOCHRONOLOGY—RELATIONSHIP BETWEEN ISTOPIC SYSTEM AND METAMORPHISM

Expand

China University of Geosciences, Wuhan 430074

Received date: 1998-02-09

Revised date: 1998-04-14

Online published: 1998-10-01

Fold

摘要

造山带构造年代学以研究造山带重大地质事件时代，建立时空格架为目的。其实质是研究同位素体系与变质作用的关系，包括变质过程中同位素体系扰动、同位素平衡、同位素均匀化以及锆石增生和放射性成因铅丢失等方面。并以大别山黄土岭麻粒岩和熊店榴辉岩为例阐述了构造年代学的研究方法和步骤，论证大别古陆老于2 814 Ma，大别山早前寒武纪基底变质事件发生在约20亿年前；大别熊店榴辉岩峰变质年龄为468 Ma。

关键词： 构造年代学; 变质作用; 麻粒岩; 榴辉岩; 大别山

本文引用格式

简平，杨巍然 . 造山带构造年代学基本问题——论同位素体系与变质作用的关系[J]. 地球科学进展, 1998 , 13(5) : 452 -457 . DOI: 10.11867/j.issn.1001-8166.1998.05.0452

Abstract

Tectonochronology is aiming at dating tectonic events and constructing the framework of time-space. It is essential to study the relationship between isotopic systems and the processes of metamorphism for tectonochronology, including the processes of isotopic disturbance, resetting, isotopic equilibrium and isotopic homogenization, growth and inheritance of zircon etc. Taking examples of the Xiongdian eclogite and the Huangtuling granulite from the Dabie Mountains, Central China, this paper states studing methods and procedure of tectonochronology in detail. The peak high pressure metamorphism is dated at 468 Ma by a combined study of Sm-Nd,U-Pb and ²⁰⁷Pb/²⁰⁶Pb zircon dating on the Xiongdian eclogite. The protolith is of mesoproterozoic age. Two stages of retrogression metamorphism are given at about 400 Ma and 300 Ma repectively. Using zorcon ²⁰⁷Pb/²⁰⁶Pb dating, a minimum age of 2 814 Ma for the Dabie basement is obtained. And the high-grade metamorphic event of basement (lower Crust) occured at about 2 000 Ma.

Key words： Tectonochronology; Metamorphism; Granulite; Eclogite; Dabie mountains.

参考文献

[1] 杨巍然, 简平. 构造年代学——当今构造研究的一个新学科. 地质科技情报, 1996, 15(4): 39-42.
[2] Vance D. Rate and time controls on metamorphic processes. Geological Journal, 1995, 30: 241-259.
[3] Mezger K, Krogstad E J. Interpretation of discordance U-Pb zircon ages: An evaluation. Metamorphic Geol, 1997, 15: 127-140.
[4] Gerhard Vavera, Dieter Gesauer, Kolf Schomid, et al. Mutiple zirocn growth and recryst allization during polyphaze late carboniferous to Triassic metamorphism in granulite of the lvera zone (Southern Alps): an ion microprob (SHRIMP) Study.Contrib Mineral Petrol, 1996, 122: 237-358.
[5] 简平, 叶伯丹, 李志昌, 等. 大别山榴辉岩同位素地质年代学, PTt轨迹及其构造意义. 见: 陈好寿主编.同位素地球化学. 杭州: 浙江大学出版社, 1994，205-215.
[6] 简平, 杨巍然, 李志昌, 等. 大别山西部熊店加里东期榴辉岩——同位素地质年代学的证据. 地质学报, 1997, 71 (2) :133-141.
[7] Chen Nengsong, you zhendong, Suo shutian. U-Pb zirocn ages of intermediate granulite and deformed granite in Dabie Mountains, Central China. Chinese Science bullitin, 1996, 41(22):1 886- 1 890.
[8] Jian Ping, Yang Weiran, Zhang Zhichao. ²⁰⁷Pb/²⁰⁶Pb Zircon dating of the Huangtuling granulite from the Dabie orogenic belt, China: new evidence for early precambrian evolution. Acta Geologica Sinica(地质学报英文版), 1998, 72(2) (出版中).
[9] Jian Ping, Yang Weiran, Hanyiqing. U-Pb and Sm-Nd dating of ultrahigh metamorphic terrane from eastern Dabie mountains, Central China) Evidence for Caledonian ultrahigh metamorphism. Acta Geoscience sinica(Special issue), 1996: 241-245.
[10] 杨巍然, 王林森, 韩郁菁, 等. 大别蓝片岩—榴辉岩年代学研究. 见: 陈好寿主编.同位素地球化学. 杭州: 浙江大学出版社, 1994. 177-195.

Options

文章导航

模态框（Modal）标题

摘要

本文引用格式

Abstract

参考文献