扬子克拉通后太古宙碎屑沉积岩地球化学及其构造意义

王选策; 高山; 刘勇胜

Volume 28 Issue 3

May 2003

Turn off MathJax

Article Contents

Article Navigation > Earth Science > 2003 > 28(3): 250-254

WANG Xuan-ce, GAO Shan, LIU Yong-sheng, 2003. Geochemical Evolution of Post-Archean Pelites from Yangtze Craton and Its Tectonic Significance. Earth Science, 28(3): 250-254.

Citation:

WANG Xuan-ce, GAO Shan, LIU Yong-sheng, 2003. Geochemical Evolution of Post-Archean Pelites from Yangtze Craton and Its Tectonic Significance. Earth Science, 28(3): 250-254.

WANG Xuan-ce, GAO Shan, LIU Yong-sheng, 2003. Geochemical Evolution of Post-Archean Pelites from Yangtze Craton and Its Tectonic Significance. Earth Science, 28(3): 250-254.

Citation:

WANG Xuan-ce, GAO Shan, LIU Yong-sheng, 2003. Geochemical Evolution of Post-Archean Pelites from Yangtze Craton and Its Tectonic Significance. Earth Science, 28(3): 250-254.

PDF( 291 KB)

Geochemical Evolution of Post-Archean Pelites from Yangtze Craton and Its Tectonic Significance

1.
Faculty ofEarth Sciences, China University ofGeosciences, Wuhan 430074, China
2.
Key Laboratory of Continental Dynamics, Department ofGeology, Northwest University, Xi'an 710069, China

Received Date: 2002-12-25
Publish Date: 2003-05-25

Abstract

Abstract

The North China and Yangtze cratons, the most important tectonic units of China, finally coalesced via collision with the formation of the E-W-trending Qinling Mountains. The North Qinling and South Qinling belts constitute the southern active margin of the North China craton and northern China passive margin of the Yangtze craton, respectively. Both the North China and Yangtze cratons and the North Qinling belt, characterized by a relatively uniform, non-evolutionary composition of clastic sediments in post-Archean La-Th-Sc-Co system, can be distinguished from each other in provenance in terms of La/Co, La/Sc, Th/Co, Th/Sc ratios. Systematic chemical compositions are analyzed (by ICP-MS ELAN 6100 DRC) for Cretaceous to Meso-Proterozoic sediments from the Yangtze craton. The REE patterns of these clastic sedimentary rocks are similar to those of the global typical sedimentary rocks such as PAAS, NASC, ES and the global upper continental crust (UC).The Silurian and Devonian pelites are characteristic of North Qinling belt with high La/Co, La/Sc, Th/Co, Th/Sc ratios. The value of δ (Eu) is sensitive to the mafic material. When the mafic material become a kind of provenance, the value of δ (Eu) changes from 0.61-0.62 to 0.68-0.69, showing that the Yangtze craton accreted to the North Qinling on the southern margin of North China cratons in the Silurian-Devonian period.
- clastic sedimentary rock,
- provenance,
- upper crust,
- geochemistry,
- Yangtze craton

FullText(HTML)

References(17)

References

[1]	Taylor S R, McLennan S M. The continental crust: its composition and evolution[M]. Oxford: Blackwell, 1985. 1-45.
[2]	McLennan S M, Taylor S R, McCulloch M T, et al. Geochemical and Nd-Sr isotopic composition of deep-seaturbidites: crustal evolution and plate tectonic associations [J]. Geochim Cosmochim Acta, 1990, 54: 2015-2050. doi: 10.1016/0016-7037(90)90269-Q
[3]	McLennan S M, Taylor S R. Sedimentary rocks and crustal evolution: tectonic setting and secular trends[J]. J Geol, 1991, 99: 1-21. doi: 10.1086/629470
[4]	McLennan S M. Relationships between the trace element composition of sedimentary rocks and upper continental crust[J/OL]. Geochemistry Geophysics Geosystem(G3), 2000GC00109, 2001-04-20.
[5]	Condie K C. Chemical composition and evolution of the upper continental crust: contrasting results from surface samples and shales[J]. Chem Geol, 1993, 104: 1-37. doi: 10.1016/0009-2541(93)90140-E
[6]	Gao S, Wedpeohl K H. The negative Eu anomaly in Archean sedimentary rocks: implications for decomposition, age and importance of their granitic sources[J]. EPSL, 1995, (133): 81-94.
[7]	Gao S, Zhang B R, Zhu 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: 183197.
[8]	Gao S, Ling W L, Zhang B R, et al. Contrasting geochemical and Sm-Nd isotopic compositions of Archean metasediments from the Kongling high-grade terrain of the Yangtze craton: evidence for cratonic evolution and redistribution of REE during crustal anatexis[J]. GCA, 1999, 63(13/14): 2071-2088.
[9]	Taylor S R, McLennan S M. The geochemical evolution of the continental crust[J]. Review of Geophysics, 1995, 33 (2): 241-265. doi: 10.1029/95RG00262
[10]	赵祖斌, 高山, 骆庭川, 等. 华北克拉通碎屑沉积岩地球化学: 异常太古宙—元古宙界线的初步研究[J]. 地学前缘, 2000, 7(2): 431-439. doi: 10.3321/j.issn:1005-2321.2000.02.011 ZHAO Z B, GAO S, LUO T C, et al. Geochemistry of clastic sedimentary rocks from the North China craton: a preliminary study of anomalous Archean-Proterozoic boundary[J]. Earth Science Frontiers, 2000, 7(2): 431-439. doi: 10.3321/j.issn:1005-2321.2000.02.011
[11]	Gao S, Luo T C, Zhang B R, et al. Chemical composition of the continental crust as revealed by studies in East China[J]. GCA, 1998, 62(11): 1959-1975.
[12]	陈岳龙, 罗照华, 刘翠. 对扬子克拉通西缘四川康定—冕宁变质基底的新认识———来自Nd同位素的证据[J]. 地球科学———中国地质大学学报, 2001, 26(3): 279-285. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200103009.htm CHEN Y L, LUO Z H, LIU C. New recognition of Kangding-Mianning metamorphic complexes from Sichuan, western Yangtze craton: evidence from Nd istopic composition[J]. Earth Science— Journal of China University of Geosciences, 2001, 26(3): 279-285. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200103009.htm
[13]	李献华, McCulloch M T. 扬子南缘沉积岩的Nd同位素演化及其大地构造意义[J]. 岩石学报, 1996, 12(3): 359-369. doi: 10.3321/j.issn:1000-0569.1996.03.001 LI X H, McCulloch M T. Nd isotopic evolution of sediments from the southern margin of the Yangtze block and its tectonic significance[J]. J Petrology, 1996, 12(3): 359-369. doi: 10.3321/j.issn:1000-0569.1996.03.001
[14]	张宗清, 张国伟, 唐索寒, 等. 秦岭黑河镁铁质枕状熔岩年龄和地球化学特征[J]. 中国科学(D辑), 2001, 31 (1): 36-42. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK200101004.htm ZHANG Z Q, ZHANG G W, TANG S H, et al. Age and geochemical character of mafic pillow lava from Qinling Heihe[J]. Science in China(Series D), 2001, 31(1): 36-42. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK200101004.htm
[15]	De Baar H J W, Bacon M P, Brewer P G, et al. Rare earth elements in the Pacific and Atlantic oceans[J]. Geochim Cosmochim Acta, 1985, 49: 1943-1959. doi: 10.1016/0016-7037(85)90089-4
[16]	Murray R W, Buchholtz ten Brink R W, Jones M R, et al. Rare earth elements as indicators of different marine depositional environments in chert and shale[J]. Geology, 1990, 18: 268-271.
[17]	Murray R W, Buchholtz ten Brink M R, Gerlach D C, et al. Rare earth, major and trace elementsin chert from the Franciscan complex and Monterey Group, California: assessing REE sources to fine-grained marine sediments[J]. Geochim Cosmochim Acta, 1991, 155: 1875-1895.