大别山碰撞造山带俯冲盘陆壳基底组成:白垩纪脉岩捕获/继承锆石的证据

doi:10.13745/j.esf.sf.2023.5.1

地学前缘 ›› 2023, Vol. 30 ›› Issue (4): 299-316.DOI: 10.13745/j.esf.sf.2023.5.1

大别山碰撞造山带俯冲盘陆壳基底组成:白垩纪脉岩捕获/继承锆石的证据

徐大良¹^,²(), 邓新¹^,², 彭练红¹^,^*(), 田洋¹^,², 金巍¹^,²^,³, 金鑫镖¹^,²

1.中国地质调查局武汉地质调查中心(中南地质科技创新中心), 湖北武汉 430205
2.中国地质调查局花岗岩成岩成矿地质研究中心, 湖北武汉 420205
3.中国地质科学院地质研究所, 北京 100037

收稿日期:2023-02-24 修回日期:2023-05-04 出版日期:2023-07-25 发布日期:2023-07-07
通讯作者: *彭练红(1966-),男,教授级高级工程师,从事区域大地构造研究。E-mail: 245737309@qq.com
作者简介:徐大良(1983-),男,高级工程师,从事基础地质调查与研究工作。E-mail: xdl2003geo@163.com
基金资助:
中国地质调查局地质调查项目(DD20221634);中国地质调查局地质调查项目(DD20190050);中国地质调查局花岗岩成岩成矿地质研究中心开放基金课题(PMGR202014)

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

XU Daliang¹^,²(), DENG Xin¹^,², PENG Lianhong¹^,^*(), TIAN Yang¹^,², JIN Wei¹^,²^,³, JIN Xinbiao¹^,²

1. Wuhan Center, China Geological Survey (Geosciences Innovation Center of Central South China), Wuhan 430205, China
2. Research Center for Petrogenesis and Mineralization of Granitoid Rocks, China Geological Survey, Wuhan 430205, China
3. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Received:2023-02-24 Revised:2023-05-04 Online:2023-07-25 Published:2023-07-07

摘要/Abstract

摘要：

蕴藏在年轻造山带中的古老陆壳基底是揭示陆块早期构造事件和演化的良好载体。碰撞造山带中俯冲盘大陆基底一般位于多层次地壳结构的下部而难以在地表广泛出露,而浅表火成岩中的捕获/继承锆石可以用来示踪大陆地壳深部古老物质的组成和演化。本文报道了在大别山南缘8件中生代脉岩(140~127 Ma)中新发现捕获/继承锆石的U-Pb年龄和Hf同位素组成特征,用以探讨鲜有关注的大别山碰撞造山带俯冲盘陆壳基底的组成和演化等关键问题。捕获/继承锆石U-Pb年龄显示出显著的前寒武纪峰值年龄,记录了丰富的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和0.71~0.59 Ga等多阶段岩浆事件,以及3.28 Ga、2.87 Ga、2.73 Ga、2.51 Ga、1.98 Ga和0.80 Ga等六期变质事件。捕获/继承锆石的Hf同位素显示大别山南缘在太古宙发生过显著的陆壳生长,主要集中在古太古代(3.6~3.3 Ga)和新太古代(2.7~2.6 Ga),并经历了多期次的陆壳再造(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和0.1 Ga)。综合分析认为大别山南缘应代表了未卷入深俯冲的俯冲盘早前寒武纪陆壳基底,并至少经历了古元古代、新元古代等多期次岩浆构造热事件的叠加改造,其形成分别与Columbia超大陆和Rodinia超大陆的聚合与裂解有关。

关键词: 大别山碰撞造山带, 太古宙, 元古宙, 前寒武纪, 捕获/继承锆石, 地壳生长与再造

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

中图分类号:

P542
P534

徐大良, 邓新, 彭练红, 田洋, 金巍, 金鑫镖. 大别山碰撞造山带俯冲盘陆壳基底组成:白垩纪脉岩捕获/继承锆石的证据[J]. 地学前缘, 2023, 30(4): 299-316.

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.

图/表 7

图1 大别山南缘区域构造简图(据文献[10,23,27-28]修编)

Fig.1 Geological sketch map showing major tectonic units of the southern Dabie orogen. Modified after [10,23,27-28].

图2 大别山南缘中生代侵入岩脉的野外和镜下特征 a-正长岩脉侵入到变质表壳岩中;b-闪长岩脉侵入到花岗质片麻岩中;c-变基性岩脉侵入到花岗质片麻岩中;d-正长岩脉;e-闪长岩脉;f-变基性岩脉。Qtz-石英;Pl-斜长石;Ab-钠长石;Hbl-角闪石;Bt-黑云母。

Fig.2 Terrain feature and microscopic characteristics of Mesozoic intrusive dykes in the southern Dabie orogen

表1 大别山南缘中生代脉岩中捕获/继承锆石年龄统计表

Table 1 Statistical Table of xenocrystic/inherited zircon ages of Mesozoic dykes in the southern Dabie orogen

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

图3 大别山南缘中生代侵入岩脉代表性锆石阴极发光图像数字为锆石表观年龄和εHf(t)值。

Fig.3 Cathodoluminescence (CL) images for representative zircons from Mesozoic intrusive dykes in the southern Dabie orogen

图4 大别山南缘中生代侵入岩脉锆石U-Pb年龄图(a-h)和年龄频谱直方图(A-H)

Fig.4 Zircon U-Pb ages (a-h) and zircon age histograms (A-H) of Mesozoic intrusive dykes in the southern Dabie orogen

图5 大别山南缘锆石U-Pb年龄和Hf同位素特征对比图数据来源:大别山核部捕获/继承锆石[33],大别山南缘碎屑锆石[4-5,22],大别山南缘前寒武纪岩浆岩[18,23,27-28,34]。

Fig.5 Comparison of zircon U-Pb age and Hf isotope characteristics in the southern Dabie orogen. Xenocrystic/inherited zircon data from [33]; detrital zircon data from [4-5,22]; Precambrian igneous rock data from [18,23,27-28,34].

图6 大别山南缘锆石Hf同位素二阶段模式年龄分布和地壳生长曲线图早前寒武纪地壳生长曲线分别依据碎屑锆石[5]和捕获/继承锆石Hf同位素亏损地幔二阶段模式年龄绘制。

Fig.6 Two-stage zircon Hf model age (TDM2) distribution and crustal growth curve showing two main crustal growth periods (3.6-3.3 Ga and 2.7-2.6 Ga) in the southern Dabie orogen

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大别山碰撞造山带俯冲盘陆壳基底组成:白垩纪脉岩捕获/继承锆石的证据

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

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