The components of the subducted continental basement within the Dabieshan orogenic belt as evidenced by xenocrystic/inherited zircons from Cretaceous dykes

doi:10.13745/j.esf.sf.2023.5.1

Abstract

Abstract:

Ancient continental basement of young orogenic belts may reveal the early evolutionary history of continental blocks. Continental basement of subduction plate in a collision orogen is generally located in the Earth’s lower crust and unlikely to be widely exposed on the Earth’s surface, however, xenocrystic/inherited zircons from shallow igneous rocks can be used to trace the content and evolution of continental crust at depth. Here we present in situ U-Pb and Hf isotope data for the newly discovered xenocrystic/inherited zircons from Late-Mesozoic dykes (140-127 Ma) in the southern Dabieshan orogen to address the critical issue about the nature, age and evolution of geologic basement of the Dabieshan orogenic belt. The xenocrystic/inherited zircons are dated to the Precambrian and show an episodic age distribution. They record a large number of multi-stage magmatic events (at 3.44-3.23 Ga, 2.99-2.82 Ga, 2.79-2.60 Ga, 2.47 Ga, 2.00 Ga, 1.82 Ga, 0.89 Ga, 0.82-0.78 Ga and 0.71-0.59 Ga) as well as six metamorphic events (at 3.28 Ga, 2.87 Ga, 2.73 Ga, 2.51 Ga, 1.98 Ga and 0.80 Ga). The Hf isotopic composition of the xenocrystic/inherited zircons shows that the southern Dabieshan orogen experienced significant continental growth in the Archean, mainly concentrated in the Paleoarchean (3.6-3.3 Ga) and Neoarchean (2.7-2.6 Ga), and underwent multi-stage reconstruction (3.4-3.2 Ga, 3.0~2.8 Ga, 2.7-2.5 Ga, 2.0-1.8 Ga, 0.9-0.6 Ga and 0.1 Ga). According to comprehensive analysis, the southern Dabie orogen should represent basement of subduction plate that was not involved in deep subduction and at least modified by multi-stage tectono-thermal events in the Paleoproterozoic and Neoproterozoic relating to the formation of the Columbia and breakup of the Rodinia supercontinents, respectively.

Key words: Dabieshan orogenic belt, Archean, Proterozoic, Precambrian, xenocrystic/inherited zircon, crustal growth and reconstruction

CLC Number:

P542
P534

XU Daliang, DENG Xin, PENG Lianhong, TIAN Yang, JIN Wei, JIN Xinbiao. The components of the subducted continental basement within the Dabieshan orogenic belt as evidenced by xenocrystic/inherited zircons from Cretaceous dykes[J]. Earth Science Frontiers, 2023, 30(4): 299-316.

Figures/Tables 7

References 78

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样品号	点位	名称	分析点数	捕获/继承锆石数量	捕获/继承锆石峰值年龄/Ma	年龄解释
D904-2	30°17'13.7″ 115°30'20.9″	正长岩脉	130	74	812、1 985、2 470、688、2 932~2 602	岩浆锆石
D904-2	30°17'13.7″ 115°30'20.9″	正长岩脉	130	74	2 433	变质锆石
D964	30°13'50.7″ 115°32'57.6″	正长岩脉	70	47	799、1 985、2 380、2 652	岩浆锆石
D964	30°13'50.7″ 115°32'57.6″	正长岩脉	70	47	2 566、2 054、1 976	变质锆石
D912	30°13'59.1″ 115°32'38.3″	正长岩脉	110	82	2 003、803、2 479、2 873~2 591	岩浆锆石
D912	30°13'59.1″ 115°32'38.3″	正长岩脉	110	82	2 733、2 024、2 013、1 902、804、470	变质锆石
D910-2	30°13'13.1″ 115°33'15.6″	闪长岩脉	55	14	2 004、2 455、791~724	岩浆锆石
D961-7	30°19'11.4″ 115°55'21.8″	闪长岩脉	70	47	1 985、2 735、2 902、2 612	岩浆锆石
D961-7	30°19'11.4″ 115°55'21.8″	闪长岩脉	70	47	2 736、2 298、1 973	变质锆石
D966-6	30°16'54.1″ 115°29'55.8″	变基性岩脉	90	61	1 822、3 376、2 958~2 198	岩浆锆石
D966-6	30°16'54.1″ 115°29'55.8″	变基性岩脉	90	61	3 285	变质锆石
D7466n	30°16'55.9″ 115°30'36.2″	变基性岩脉	90	85	2 929、1 994、2 776~2 443、821	岩浆锆石
D7466n	30°16'55.9″ 115°30'36.2″	变基性岩脉	90	85	2 915~2 861、2 510、2 155、2 072、2 040、 1 984~1 980	变质锆石
D9523-1	30°11'17.7″ 115°17'43.4″	变基性岩脉	105	67	2 460、813、2 007、3 287~2 822	岩浆锆石
D9523-1	30°11'17.7″ 115°17'43.4″	变基性岩脉	105	67	2 502	变质锆石

样品号	点位	名称	分析点数	捕获/继承锆石数量	捕获/继承锆石峰值年龄/Ma	年龄解释
D904-2	30°17'13.7″ 115°30'20.9″	正长岩脉	130	74	812、1 985、2 470、688、2 932~2 602	岩浆锆石
D904-2	30°17'13.7″ 115°30'20.9″	正长岩脉	130	74	2 433	变质锆石
D964	30°13'50.7″ 115°32'57.6″	正长岩脉	70	47	799、1 985、2 380、2 652	岩浆锆石
D964	30°13'50.7″ 115°32'57.6″	正长岩脉	70	47	2 566、2 054、1 976	变质锆石
D912	30°13'59.1″ 115°32'38.3″	正长岩脉	110	82	2 003、803、2 479、2 873~2 591	岩浆锆石
D912	30°13'59.1″ 115°32'38.3″	正长岩脉	110	82	2 733、2 024、2 013、1 902、804、470	变质锆石
D910-2	30°13'13.1″ 115°33'15.6″	闪长岩脉	55	14	2 004、2 455、791~724	岩浆锆石
D961-7	30°19'11.4″ 115°55'21.8″	闪长岩脉	70	47	1 985、2 735、2 902、2 612	岩浆锆石
D961-7	30°19'11.4″ 115°55'21.8″	闪长岩脉	70	47	2 736、2 298、1 973	变质锆石
D966-6	30°16'54.1″ 115°29'55.8″	变基性岩脉	90	61	1 822、3 376、2 958~2 198	岩浆锆石
D966-6	30°16'54.1″ 115°29'55.8″	变基性岩脉	90	61	3 285	变质锆石
D7466n	30°16'55.9″ 115°30'36.2″	变基性岩脉	90	85	2 929、1 994、2 776~2 443、821	岩浆锆石
D7466n	30°16'55.9″ 115°30'36.2″	变基性岩脉	90	85	2 915~2 861、2 510、2 155、2 072、2 040、 1 984~1 980	变质锆石
D9523-1	30°11'17.7″ 115°17'43.4″	变基性岩脉	105	67	2 460、813、2 007、3 287~2 822	岩浆锆石
D9523-1	30°11'17.7″ 115°17'43.4″	变基性岩脉	105	67	2 502	变质锆石