Geochronology of Bimodal Volcanic Rocks from Dingyuan Formation in Western Dabie Orogen, Central China: Implications for Extension during Breakup of Rodinia
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摘要: 西大别地区定远组由浅变质的酸性火山岩（流纹岩和流纹质凝灰岩）和基性火山岩组成，二者在空间上互层产出，具典型的双峰式火山岩系组合特征，为认识南秦岭-大别造山带及扬子陆块北缘前寒武纪物质组成和地质演化提供了极佳的研究对象.通过对2件变流纹岩、1件变流纹质晶屑凝灰岩和1件变基性火山岩样品进行LA-ICP-MS锆石原位U-Pb测年，获得其成岩年龄分别为737±5 Ma、740±3 Ma、740±5 Ma和739±6 Ma.结果表明，定远组双峰式火山岩系形成时代并非前人认识的古生代，而是新元古代约740 Ma.定远组与红安岩群双峰式火山建造形成时间基本一致，指示了西大别地区新元古代一次重要的拉张构造-岩浆事件，可能形成于大陆边缘裂谷环境.扬子陆块北缘武当-随枣-大别地区新元古代800~720 Ma岩浆活动广泛且强烈，其峰期为755~730 Ma，可能是对Rodinia超大陆裂解事件的响应.Abstract: In-situ zircon U-Pb ages are reported for the meta-bimodal volcanic suite of rhyolites and basalts from the Dingyuan Formation in the western Dabie orogen. The rhyolite, the rhyolitic tuff, and the basalt yield zircon U-Pb ages of 737±5 Ma (1σ, MSWD=0.02), 740±3 Ma (1σ, MSWD=0.07), 740±5 Ma (1σ, MSWD=0.07) and 739±6 Ma (1σ, MSWD=0.07), respectively, indicating that the bimodal suite was erupted during the Neoproterozoic. Intensive magmatic rocks were widespread throughout the South Qinling, Suizao, western Dabie and eastern Dabie areas during 755 to 730 Ma, such as the Yaolinghe Group, the Suixian Group, the Hong'an Group and the Dingyuan Formation. These igneous rocks show peak ages at ca.740 Ma, indicating a continental rift extensional setting in the northern margin of the Yangtze Block during the breakup of supercontinent Rodinia.
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Key words:
- bimodal /
- volcanic rock /
- geochronology /
- Neoproterozoic /
- tectonic setting /
- Dabie orogen /
- geochemistry
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图 1 西大别地区地质简图
NWZ.泥盆系南湾组陆源碎屑岩; DYZ.定远组变质火山岩带；HWZ.浒湾组混杂岩带；XXZ.新县超高压变质带；HZ.红安岩群；SZ.宿松岩群；据刘贻灿等(2010)修改
Fig. 1. The geological sketch map of the Western Dabie belt
图 2 定远组双峰式火山岩剖面
Fig. 2. Section showing the bimodal volcanic suite of the Dingyuan Formation
图 3 定远组双峰式火山岩典型野外现象、手标本和显微照片
a.双峰式火山岩典型野外现象照片，浅变质流纹岩和变基性火山岩互层产出，并持续向南延伸.1、3、5、7层为浅变质流纹岩，2、4、6层为变基性火山岩(斜长角闪岩)；b.变流纹岩手标本照片；c.变流纹岩正交偏光显微照片；d.变流纹质凝灰岩手标本照片；e.变流纹质凝灰岩单偏光显微照片；f.变基性火山岩手标本照片；g.变基性火山岩单偏光显微照片.Pl.斜长石; Qz.石英; Hbl.角闪石
Fig. 3. Field photograph, hand spicemen and photo micrograph of the bimodal volcanic suite from the Dingyuan Formation
图 4 定远组双峰式火山岩锆石CL图像
Fig. 4. Cathodoluminescence images and LA-ICP-MS U-Pb determination spots with ages of representative zircons from the bimodal volcanic suite of the Dingyuan Formation
图 5 定远组双峰式火山岩锆石U-Pb年龄
a、b.浅变质流纹岩样品PM026-7锆石U-Pb年龄谐和图和加权平均年龄图，3颗变质锆石年龄未显示；c、d.浅变质流纹岩样品PM027-7锆石U-Pb年龄谐和图和加权平均年龄图；e、f.浅变质流纹质晶屑凝灰岩样品PM027-10锆石U-Pb年龄谐和图和加权平均年龄图；g、h.变基性火山岩样品PM027-6锆石U-Pb年龄谐和图和加权平均年龄图，变质锆石和捕获锆石数据未显示
Fig. 5. U-Pb concordia diagrams and weighted mean ages for the bimodal volcanic suite from the Dingyuan Formation
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