琼北火山岩激光<sup>40</sup>Ar/<sup>39</sup>Ar定年研究

洒骁; 季建清; 周晶

琼北火山岩激光⁴⁰Ar/³⁹Ar定年研究

- 1.
  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
- 2.
  中国地质大学，北京 100083
基金项目:
本文受中国地质调查局地质调查项目(12120113013700)资助.

详细信息

作者简介:
洒骁，男，1986年生，硕士生，地质工程专业，E-mail: shtsx@163.com

通讯作者: 季建清，男，1968年生，博士，副教授，岩石学、构造地质学与地质年代学专业，E-mail: grsange@pku.edu.cn

中图分类号: P597.3

收稿日期: 2012-11-21

修回日期: 2013-02-26

刊出日期: 2013-08-01

High-precision Laser ⁴⁰Ar/³⁹Ar dating of Qiongbei volcanic rocks

- 1.
  Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China
- 2.
  China University of Geosciences, Beijing 100083, China

More Information

Corresponding author: JI JianQing, E-mail: grsange@pku.edu.cn

Received Date: 21 November 2012

Revised Date: 26 February 2013

Publish Date: 01 August 2013

摘要

摘要:
新生代以来，雷琼地区多次、大量地喷发了一系列火山岩。前人主要基于K-Ar法对此划分了期次。本文采用激光⁴⁰Ar/³⁹Ar年代学方法，对琼北火山岩区进行了精细定年研究。低本底激光⁴⁰Ar/³⁹Ar法能够对低钾含量，极少量样品(毫克级)进行精细测定，非常适合极年轻火山岩的定年工作。结果显示的火山岩激光⁴⁰Ar/³⁹Ar法高质量数据表明琼北火山喷发活动时限跨越1.3~0.052Ma。在比较了表观年龄与等时线年龄差异之后，本文给出了年龄推荐值。正如测试数据所显示，本地区新生代火山岩普遍存在⁴⁰Ar和³⁶Ar过剩的问题，此时只有等时线年龄才代表喷发的真实年龄。
- ⁴⁰Ar/³⁹Ar年代学 /
- 琼北火山岩 /
- Ar丢失与过剩
Abstract:
Since Late Cenozoic era, volcanic rocks have been frequently and massively erupted in the Leiqiong area. Those volcanic rocks, on the basis of K-Ar dating method, are divided to several volcanic phases. In this paper, laser ⁴⁰Ar/³⁹Ar dating method is used to test and calculate the accurate time of volcanic rocks in Qiongbei area. The high quality data result by laser ⁴⁰Ar/³⁹Ar dating method shows that the time spans of eruption of Qiongbei volcanoes are around 1.3~0.052Ma. Considering the differences between the apparent ages and the isochron ages, a series of ages are recommended. As shown as the data, there are widespread inherited ⁴⁰Ar^* and ³⁶Ar excess in the Cenozoic volcanic rocks, then the isochorn ages are more recommended to be the real ages of the eruptions.
- ⁴⁰Ar/³⁹Ar Dating /
- Qiongbei volcanic rocks /
- Inherited ⁴⁰Ar

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图 1
琼北火山群区域地质简图及野外采样位置(据海南省地质矿产勘查开发局，1998^①，有修改)

Figure 1.
Sketch geological map showing the location of samples in Qiongbei

下载: 全尺寸图片幻灯片

图 2
琼北火山岩显微岩相图

Figure 2.
Microphotos of Qingbei volcanic rocks

下载: 全尺寸图片幻灯片

图 3
激光⁴⁰Ar/³⁹Ar等时现年龄结果和表观年龄的概率统计图

Figure 3.
Laser ⁴⁰Ar/³⁹Ar isochron age and age-probability diagrams

下载: 全尺寸图片幻灯片

参考文献(40)

	Bai ZD, Xu DB, Wei HQ et al. 2003. Division of the active period of Quaternary volcanism in Maanling, northern Hainan Province. Seismology and Geology, 25(Suppl.): 12-20(in Chinese)
	Chen WJ, Ge TM, Li DM et al. 1992. The K-Ar-magnetostratigraphic chronology of Cenozoic basalt in Hainan Island and Leizhou Peninsula. In: Liu RX (ed.). The Age and Geochemistry of Cenozoic Volcanic Rock in China. Beijing: Seosmological Press, 239-245(in Chinese)
	Fan QC, Sun Q, Li N et al. 2004. Periods of volcanic activity and magma evolution of Holocene in North Hainan Island. Acta Petrologica Sinica, 20(3): 533-544 (in Chinese with English abstract)
	Feng GR. 1992. Basic characteristics and relationship to tectonic environment of the Late Cenozoic basalts along the coast of South China Sea. Sun Yatsen University Forum, 1:93-103 (in Chinese with English abstract)
	Ge TM, Chen WJ, Xu X et al. 1989. The geomagnetic polarity timescale of Quaternary for Leiqiong region: The K-Ar dating and palaeomagnetic evidences from igneous rocks. Acta Geophysica Sinica, 32(5): 550-557(in Chinese with English abstract)
	Huang ZG, Cai FX, Han ZY et al. 1993. Quaternary Volcanoes in Leizhou Peninsula and Northern Hainan Island. Beijing: Science Press, 8-17 (in Chinese)
	Li DM, Chen WJ and Li Q. 1999. K-Ar age of young volcanic rocks and excess argon-Binary mixing model and quantitative study of excess argon effect. Chinese Science Bulletin, 44(7): 658-663(in Chinese)
	Li WR, Ji JQ, Zhou J et al. 2013. Laser ⁴⁰Ar/³⁹Ar isochron dating on Leizhou Quaternary volcanic rocks. Acta Petrologica Sinica, 29(8): 2775-2788 (in Chinese with English abstract)
	Liu JQ. 1987. Study on geochronology of the Cenozoic volcanic rocks in Northeast China. Acta Petrologica Sinica, (4): 21-31(in Chinese with English abstract)
	Liu JQ, Mai MT and Yi M. 1990. Quaternary volcanic distributing in West Kunlung Mountain and its K-Ar dating. Science in China (Series B), 2: 180-187(in Chinese)
	Liu JQ. 1999. Volcanos in China. Beijing: Science Press, 1-200 (in Chinese)
	McDougall I and Harrison TM. 1999. Geochronology and Thermochronology by the ⁴⁰Ar/³⁹Ar Method. 2^nd Editon. Oxford: Oxford University Press
	Mu ZG, Tong W and Garniss HC. 1987. Times of volcanic activity and origin of magma in Tengchong Geothermal aera, West Yunnan Province. Acta Geophysica Sinica, 30(3): 261-270 (in Chinese with English abstract)
	Purdy JW and Jger E. 1976. K-Ar ages on rock-forming minerals from the Central Alps. Memoria Instituto Geologica e Mineralogica, Università di Pavlova, 30: 31-42
	Renne PR. 2000. K-Ar and ⁴⁰Ar/³⁹Ar dating. In: Noller JS, Sowers JM and Lettis WR (eds.). Quaternary Geochronology: Methods and Applications. Washington: American Geophysical Union, 77-100
	Sang HQ, Wang F, He HY et al. 2006. Intercalibration of ZBH-25 biotite reference material untilized for K-Ar and ⁴⁰Ar/³⁹Ar age determination. Acta Petrologica Sinica, 32(12): 3059-3078 (in Chinese with English abstract)
	Steiger RH and Jger E. 1977. Subcommission on geochronology: Convention on the use of decay constants in geochronology and cosmochronology. Earth and Planetary Science Letters, 36: 359-362
	Sun JZ. 1988. Research on stratigraphic chronology of Quaternary in the northern Hainan Province. In: Ding YZ, Li P, Shi ZL et al. (eds.). Collected Papers of Research on Earthquake in Northern Hainan Island. Beijing: Seismological Press, 26-33 (in Chinese)
	Wang HF, Yang XC, Zhu BQ et al. 1988. K-Ar chronology and evolution of the Cenozoic volcanic rocks in the eastern China. Geochimica, 19(1): 1-11 (in Chinese)
	Wang XF, Ma DQ and Jiang DH. 1991. Geology of Hainan Island (No. 1). Beijing: Geological Publishing House, 167-183 (in Chinese)
	Zhou J, Ji JQ, Deino AL et al. 2013. Laser fusion ⁴⁰Ar/³⁹Ar dating on young volcanic rocks. Acta Petrologica Sinica, 29(8): 2811-2825 (in Chinese with English abstract)
	Zhu BQ, Wang HF, Yang XC. 1988. Geochronology of Cenozoic volcanism in East China and global changes of tectonic environment. Geochimica, 17(3): 209-215(in Chinese with English abstract)
	白志达, 徐德斌, 魏海泉等. 2003. 琼北马鞍岭地区第四纪火山活动期次划分. 北京: 地震地质, 25 (增): 12-20
	陈文寄, 葛同明, 李大明等. 1992. 雷琼新生代玄武岩的K-Ar——磁性地层年代学. 见:刘若新编.中国新生代火山岩年代学与地球化学. 北京: 地震出版社, 239-245
	樊祺诚, 孙谦, 李霓等. 2004. 琼北火山活动分期与全新世岩浆演化. 岩石学报, 20(3): 533-544
	冯国荣. 1992. 华南沿海晚新生代玄武岩基本特征及其与构造环境的关系. 中山大学学报论丛, 1:93-103
	葛同明, 陈文寄, 徐行等. 1989. 雷琼地区第四纪地磁极性年表——火山岩钾-氩年龄及古地磁学证据. 地球物理学报, 32(5): 550-557
	黄镇国, 蔡福祥, 韩中元等. 1993. 雷琼第四纪火山. 北京: 科学出版社, 8-17
	李大明, 陈文寄, 李齐. 1999. 年轻火山岩的K-Ar年龄与过剩氩: 二元混合模式及过剩氩影响的定量研究. 科学通报, 44(7): 658-663
	李蔚然, 季建清, 桑海清等. 2013. 雷州半岛第四纪火山岩激光⁴⁰Ar/³⁹Ar等时线定年研究. 岩石学报, 29(8): 2775-2788
	刘嘉麒. 1987. 中国东北地区新生代火山岩的年代学研究. 岩石学报, 4: 21-31
	刘嘉麒, 买买提, 依明. 1990. 西昆仑山第四纪火山的分布与K-Ar年龄. 中国科学(B辑), 2: 180-187
	刘嘉麒. 1999. 中国火山. 北京:科学出版社, 1-200
	穆治国, 佟伟,Garniss HC. 1987. 腾冲火山活动的时代和岩浆来源问题. 地球物理学报, 30(3): 261-270
	桑海清, 王非, 贺怀宇等. 2006. K-Ar法地质年龄国家一级标准物质ZBH-25黑云母的研制. 岩石学报, 22(12): 3059-3078
	孙建中. 1988. 琼北地区第四纪火山活动的研究. 见:丁原章,李玶,时振梁等编. 海南岛北部地震研究文集. 北京: 地震出版社, 26-33
	王慧芬, 杨学昌, 朱炳泉等. 1988. 中国东部新生代火山岩K-Ar年代学及其演化. 地球化学, 19(1): 1-11
	汪啸风, 马大铨, 蒋大海. 1991. 海南岛地质(一). 北京: 地质出版社, 167-183
	周晶, 季建清, Deino AL等. 2013.(极)年轻火山岩激光熔蚀⁴⁰Ar/³⁹Ar定年. 岩石学报,29(8): 2811-2825
	朱炳泉, 王慧芬, 杨学昌. 1988. 中国东部新生代火山作用时代与构造环境变迁. 地球化学. 17(3) :209-215