Zircon U-Pb age and Hf isotopic systematics of Late Paleozoic volcanic from the western margin of east Junggar and tectonic implication
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摘要: 白碱沟和帐篷沟剖面位于东准噶尔西缘,出露有大量古生代火山岩,是研究东准噶尔古生代火山岩及构造演化的有利区域。本文利用LA-MC-ICP-MS锆石U-Pb定年法和Hf同位素系统对该区中的玄武岩、玄武质安山岩、流纹岩、角斑岩以及少量的凝灰岩和正长斑岩进行了地质年代学研究,认为它们形成于早泥盆世至晚石炭世之间(400～307 Ma)。玄武岩和玄武质安山岩多以岩脉产出,年龄在435～300 Ma之间,正的εHf(t)(+0.7～+15.4)值,这意味着东准噶尔为年轻地壳控制,前寒武纪基底即便存在也非常有限。白碱沟地区侵入的正长斑岩锆石U-Pb年龄为307 Ma和315 Ma,正的εHf(t)值,表明地壳物质的垂向增生。该区流纹岩锆石U-Pb年龄为323 Ma和315 Ma,也有正的εHf(t)值,表明地壳物质的侧向增生。帐篷沟地区角斑岩和流纹岩锆石U-Pb年龄分别为336 Ma和332 Ma,其形成于火山弧或受到了部分岛弧物质混染的环境中。因此,在后碰撞伸展垮塌背景下,东准噶尔主要为俯冲增生地体,现今可定义为古生代马里亚纳型洋内岛弧。Abstract: Two sections,namely Baijiangou and Zhangpenggo,in the western margin of east Junggar,where expose a large number of Paleozoic volcanic rocks,are the favorable areas to study the tectonic evolution of the east Junggar.LA-MC-ICP-MS zircon U-Pb dating and Hf isotopic systematics study of igneous rocks(basalt,basaltic andesite,rhyolite and keratophyre with minor tuff and syenite-porphyry),using geochrony technology,suggests that they were formed during Early Devonian to Late Carboniferous(400～307 Ma).Basalts and basaltic andesites are more likely output as dikes,and they display age-range from 435 Ma to 300 Ma and show positive εHf(t) values(+0.7～+15.4),which suggests that the east Junggar terrane is controled by juvenile crust and that the Precambrian crystalline rocks must be very limited,if there is any.The Zhangpenggou rhyolite and keratophyre,zircon U-Pb ages of 332 Ma and 336 Ma respectively,were formed in a volcanic arc environment or a environment which was mixed with part of island arc.The Baijiangou syenite-porphyries with positive εHf(t) values in Late Carboniferous(307 Ma and 315 Ma)indicate a vertical accretion of crustal materials.The Baijiangou rhyolites which show positive εHf(t)values and zircon U-Pb ages of 315 Ma and 323 Ma suggests a lateral accretion of crustal materials.Therefore,the east Junggar is mainly accretionary prism undering extensional settings of post-collisional period,and it's considered today to be a Paleozoic Mariana-type intra-oceanic island arc.
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Key words:
- Central Asian orogenic belt /
- East Junggar /
- Zircon U-Pb dating /
- Hf isotopic /
- Juvenile crust /
- Island arc /
- Continental growth
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