大别山英山和熊店榴辉岩单颗粒锆石SHRIMPU-Pb年代学研究

高山; 凌文黎; McNaughtonNeal J.; 张本仁; 张国伟; 张泽明; 钟增球; 索书田

大别山英山和熊店榴辉岩单颗粒锆石SHRIMPU-Pb年代学研究

1.
中国地质大学地球科学学院, 湖北武汉 430074
2.
西北大学地质学系, 陕西西安 710069
3.
战略矿床教学与研究中心, 西澳大学, 佩思, 澳大利亚
4.
中国地质科学院地质研究所, 北京 100081

基金项目:

国家自然科学基金 49794043

国家自然科学基金 49625305

科技部项目 G1999043202

澳大利亚研究理事会 ARC

详细信息

作者简介:
高山(1962-), 男, 教授, 1989年毕业于中国地质大学(武汉), 获博士学位, 现主要从事岩石圈地球化学研究

中图分类号: P588.34
计量
- 文章访问数: 4617
- HTML全文浏览量: 758
- PDF下载量: 19
- 被引次数: 0
出版历程
- 收稿日期: 2001-10-15
- 刊出日期: 2002-09-25

SHRIMP Single Zircon U-Pb Geochronology of Eclogites from Yingshan and Xiongdian

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Department of Geology, Northwest University, Xi'an 710069, China
3.
Key Center for Teaching and Research in Strategic Mineral Deposits, the University of Western Australia, Nedlands 6907, Perth, Australia
4.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100081, China

摘要

摘要: 报道了对大别山高压-超高压带河南罗山熊店和湖北英山蜜蜂尖两地榴辉岩单颗粒锆石SHRIMPU -Pb原位(in-situ)定年结果.英山超高压榴辉岩年龄有4组: (773±20)Ma, (730±16)Ma, (461±7)Ma和(262±6)Ma, 其中以(461±7)Ma占绝对优势.熊店高压榴辉岩有3组年龄: (44 9±14)Ma, (30 7±14)Ma和(216±4)Ma.两地榴辉岩中均存在约450Ma的早古生代奥陶纪年龄, 它们均具有极低的Zr含量(9×10^-6~19×10^-6).结合熊店榴辉岩样品具有类似于MORB的微量元素特征和ε_Nd值(45 0Ma时为+6.56), 说明该古生代年龄应代表古生代洋壳和岛弧物质俯冲经高压-超高压变质作用的产物.由于奥陶纪高压-超高压事件的年龄同时出现在英山和熊店榴辉岩中, 且熊店榴辉岩中清楚地记录了三叠纪高压-超高压事件, 表明大别高压-超高压带北界无论是在奥陶纪或三叠纪时均应在熊店榴辉岩以北的桐柏.
- 高压-超高压变质带 /
- 榴辉岩 /
- 锆石U-PB年龄 /
- SHRIMP /
- 古生代 /
- 大别山
Abstract: Zircons of eclogites from Xiongdian (Luoshan, Henan) and Mifengjian (Yingshan, Hubei) are dated by the SHRIMP U-Pb method. The Yingshan coesite-bearing ultrahigh-pressure eclogite shows four age groups: (773±20) Ma, (730±16) Ma, (461±7) Ma and (262±6) Ma, with the dominance of the (461±7) Ma group. The Xiongdian high-pressure eclogite shows three age groups of (449±14) Ma, (307±14) Ma and (216±4) Ma. The ca. 450 Ma age is present in eclogites from both localities. They have extremely low Zr (9×10^-6-19×10^-6). Together with the MORB-like trace element characteristics and ε_Nd (+6.56 at 450 Ma), the age suggests an early Paleozoic high-and ultrahigh-pressure metamorphic event probably related to the subduction of oceanic crust and associated arc materials. The coexisting Ordovician and Triassic ages in the Xiongdian eclogite also suggest that the northern boundary of the Dabie high and ultrahigh-pressure metamorphic belt, regardless of time, is to the north of Xiongdian.
- high-and ultrahigh-pressure metamorphic belt /
- eclogite /
- zircon U-Pb age /
- SHRIMP /
- Paleozoic /
- Dabieshan mountain

HTML全文

图 1 湖北英山蜜蜂尖超高压榴辉岩样品M1053的单颗粒锆石SHRIMP U-Pb年龄谐和

Fig. 1. Concordia diagram of single-zircon SHRIMP U-Pb dating for M1053 UHP eclogite from Mifengjian of Yingshan, Hubei Province

下载: 全尺寸图片幻灯片

图 2 河南熊店高压榴辉岩样品HXD98-7的单颗粒锆石SHRIMP U-Pb年龄谐和

Fig. 2. Concordia diagram of single-zircon SHRIMP U-Pb dating for HXD98-7 HP eclogite from Xiongdian of Luoshan, Henan Province

下载: 全尺寸图片幻灯片

图 3 M1053和HXD98-7榴辉岩单颗粒锆石SHRIMP U-Pb年龄与w(Th)/w(U)之间的关系

Fig. 3. Correlation between SHRIMP ²³⁸U/²⁰⁶Pb age and w (Th)/w(U)ratio for zircon of eclogites M1053 and HXD98-7

下载: 全尺寸图片幻灯片

图 4 M1053和HXD98-7榴辉岩的稀土元素分配模式

Fig. 4. REE distributions of eclogites M1053 and HXD98-7

下载: 全尺寸图片幻灯片

图 5 M1053和HXD98-7榴辉岩的微量元素分配模式

Fig. 5. Trace elemental distributions of eclogites M1053 and HXD98-7

下载: 全尺寸图片幻灯片

表 1 蜜蜂尖榴辉岩M1053的SHRIMP U-Pb锆石年龄分析结果

Table 1. SHRIMP U-Pb isotopic cormposition of zircons for Mifengjian eclogite M1053

表 2 熊店榴辉岩HXD98-7的SHRIMP U-Pb锆石年龄分析结果

Table 2. SHRIMP U-Pb isotopic composition of zircons for Xiongdian eclogite HXD98-7

参考文献(22)

[1]	Li S G, Xiao Y, Liou D, et al. Collision for the North China and Yangtze blocks and formation of coesite-bearing eclogite: timing and processes[J]. Chemical Geology, 1993, 161: 89-111.
[2]	李曙光, 李惠民, 陈移之, 等. 大别山-苏鲁地体超高压变质年代学: Ⅱ. 锆石U-Pb同位素体系[J]. 中国科学(D辑), 1997, 27(3): 200-206. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK199703001.htm LI S G, LI H M, CHEN Y Z, et al. Metamorphic geochronology of the Dabie-Sulu ultrahigh-pressure terrain. Ⅱ. Zircon U-Pb isotopic system[J]. Science in China (Series D), 1997, 27(3): 200-206. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK199703001.htm
[3]	Jahn B M, Cornichet J, Cong B, et al. Ultrahigh-ε_Nd eclogites from an ultrahigh-pressure metamorphic terrane of China[J]. Chemical Geology, 1996, 127: 61-79. doi: 10.1016/0009-2541(95)00108-5
[4]	Ames L, Zhou G, Xiong B. Geochronology and geochemistry of ultrahigh-pressure metamorphism with implications for collision of the Sino-Korean and Yangtze cratons, Central China[J]. Tectonics, 1996, 15: 472-489. doi: 10.1029/95TC02552
[5]	Rowley D B, Xue F, Tucker R D, et al. Ages of ultrahigh pressure metamorphism and protolith orthogneisses from the eastern Dabie Shan: U/Pb zircon geochronology[J]. Earth and Planetary Science Letters, 1997, 151: 191-203. doi: 10.1016/S0012-821X(97)81848-1
[6]	Hacker B R, Ratschbacher L, Webb L, et al. U/Pb zircon ages constrain the architecture of the ultrahigh-pressure Qinling-Dabie orogen, China[J]. Earth and Planetary Science Letters, 1998, 161: 215-230. doi: 10.1016/S0012-821X(98)00152-6
[7]	张泽明, 游振东, 韩郁菁. 大别-苏鲁榴辉岩带的岩石学、变质作用过程及成因研究[J]. 地质学报, 1995, 69: 306-323. doi: 10.3321/j.issn:0001-5717.1995.04.002 ZHANG Z M, YOU Z D, HAN Y J. Study of petrology, metamorphism and genesis of Dabie-Sulu eclogites[J]. Acta Geologica Sinica, 1995, 69: 306-323. doi: 10.3321/j.issn:0001-5717.1995.04.002
[8]	游振东, 韩郁菁, 张泽明. 东秦岭-大别高压-超高压变质带[M]. 武汉: 中国地质大学出版社, 1998. 157. YOU Z D, HAN Y J, ZHANG Z M. East Qinling-Dabie ultrahigh-pressure metamorphic belt[M]. Wuhan: China University of Geosciences Press, 1998. 157.
[9]	简平, 杨巍然, 李志昌. 大别山西部熊店加里东期榴辉岩——同位素年代学的证据[J]. 地质学报, 1997, 71(2): 133-141. https://www.cnki.com.cn/Article/CJFDTOTAL-DZXE199702004.htm JIAN P, YANG W R, LI Z C. Caledonian eclogite from Xiongdian, western Dabieshan mountains: geochronological evidence[J]. Acta Geologica Sinica, 1997, 71(2): 133-141. https://www.cnki.com.cn/Article/CJFDTOTAL-DZXE199702004.htm
[10]	简平, 刘敦一, 杨巍然, 等. 大别山西部河南罗山熊店加里东期榴辉岩锆石特征及SHRIMP分析结果[J]. 地质学报, 2000, 74(3): 259-264. https://www.cnki.com.cn/Article/CJFDTOTAL-DZXE200003007.htm JIAN P, LIU D Y, YANG W R, et al. Characteristics and SHRIMP U-Pb dating of zircon from Caledonian Xiongdian eclogite, Luoshan, Henan Province, western Dabieshan mountains[J]. Acta Geologica Sinica, 2000, 74(3): 259-264. https://www.cnki.com.cn/Article/CJFDTOTAL-DZXE200003007.htm
[11]	张本仁, 骆庭川, 高山, 等. 秦巴岩石圈构造及成矿规律地球化学研究[M]. 武汉: 中国地质大学出版社, 1994. 446. ZHANG B R, LUO T C, GAO S, et al. Geochemical study of structure and ore genesis of lithosphere in the Qinba area[M]. Wuhan: China University of Geosciences Press, 1994. 446.
[12]	张国伟, 孟庆任, 于在平, 等. 秦岭造山带的造山过程及其动力学特征[J]. 中国科学(D辑), 1996, 39(3): 193-200. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK199603000.htm ZHANG G W, MENG Q R, YU Z P, et al. Orogenesis and dynamics of the Qinling orogen[J]. Science in China (Series D), 1996, 39(3): 225-234, https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK199603000.htm
[13]	Zhang H F, Gao S, Zhang B R, et al. Pb isotopes of granitoids suggest Devonian accretion of the Yangtze (South China)craton to the North China craton[J]. Geology, 1997, 25: 2015-2018. http://search.ebscohost.com/login.aspx?direct=true&db=aph&AN=9712015127&site=ehost-live
[14]	Kroner A, Zhang G W, Sun Y. Granulites in the Tongbai area, Qinling belt, China: geochemistry, petrology, single zircon geochronolgy, and implications for the tectonic evolution of eastern Asia[J]. Tectonics, 1993, 12: 245-255. doi: 10.1029/92TC01788
[15]	胡能高, 赵东林, 徐伯青, 等. 北秦岭官坡地区高压-超高压榴辉岩岩相学及变质作用研究[J]. 矿物岩石, 1995, 15(4): 1-9. https://www.cnki.com.cn/Article/CJFDTOTAL-KWYS504.000.htm HU N G, ZHAO D L, XU B Q, et al. Petrology and metamorphism of high to ultrahigh pressure eclogites from the Guanpo area, North Qinling[J]. Mineralogy and Petrology, 1995, 15(4): 1-9. https://www.cnki.com.cn/Article/CJFDTOTAL-KWYS504.000.htm
[16]	魏春景, 吴玉新, 倪云燕, 等. 河南桐柏地区榴辉岩的特征及其地质意义[J]. 科学通报, 1999, 44: 1882-1885. https://www.cnki.com.cn/Article/CJFDTOTAL-KXTB199917019.htm WEI C J, WU Y X, NI Y Y, et al. Characteristics and geological significance of eclogites from the Tongbai area, Henan Province[J]. Chinese Science Bulletin, 1999, 44: 1882-1885. https://www.cnki.com.cn/Article/CJFDTOTAL-KXTB199917019.htm
[17]	Qiu Y, Gao S, McNaughton N J, et al. SHRIMP U-Pb zircon and Nd isotopic evidence for> 3.0 Ga continental crust in the Yangtze craton, South China[J]. Geology, 2000, 28: 11-14.
[18]	Hofmann A W. Chemical differentiation of the Earth: the relationship between mantle, continental crust, and oceanic crust[J]. Earth and Planetary Science Letters, 1988, 90: 297-314.
[19]	Becker H, Jochum K P, Carlson R W. Trace element fractionation during dehydration of eclogites from high-pressure terranes and the implications for element fluxesin subduction zones[J]. Chemical Geology, 2000, 163: 65-99.
[20]	Gao S, Zhang B R, Gu X M, et al. Silurian-Devonian provenance changes of South Qinling basins: implications for accretion of the Yangtze(South China) to the North China cratons[J]. Tectonophysics, 1995, 250: 183-197.
[21]	Meng Q R, Zhang G W. Geologic frame work and tectonic evolution of the Qinling orogen, central China[J]. Tectonophysics, 2000, 323: 183-196.
[22]	徐树桐, 苏文, 刘贻灿. 大别山北部榴辉岩的发现及其岩相学意义[J]. 科学通报, 1999, 44: 1452-1456. https://www.cnki.com.cn/Article/CJFDTOTAL-KXTB199913020.htm XU S T, SU W, LIU Y C. Findings of eclogites from the North Dabie belt and their petrographic significance[J]. Chinese Science Bulletin, 1999, 44: 1452-1456. https://www.cnki.com.cn/Article/CJFDTOTAL-KXTB199913020.htm