Zircon U-Pb Geochronology of the Meta-Acidic Volcanic Rocks from the Wudangshan Group , Southern Qinling Mountains , Central China
Zircon U-Pb Geochronology of the Meta-Acidic Volcanic Rocks from the Wudangshan Group , Southern Qinling Mountains , Central China
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发表时间：
2013
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通讯作者：
Z. Yongqing
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作者：
Z. Yongqing
本文用LA-MC-ICPMS方法研究了南秦岭武当山群3个变酸性火山岩的锆石U-Pb年龄。定年结果表明，中酸性火山岩的年龄为675.2±3.1Ma (MSWD=3.7)，限制了武当山群具有南环（低温）期成分。武当山群主要由不同时代的火山岩和少量沉积岩组成，具有复杂的变形变质作用，包括多期岩浆岩。武当山群中部分变酸性火山岩与姚岭河群火山岩和武当山群基性侵入岩年龄相近，说明酸性火山岩与武当山群和姚岭河群火山岩的基性侵入岩可能存在成因关系。根据现有同位素测年结果，认为武当山群的年龄跨度从太古宙一直延伸到中生代，但新近获得的年龄资料总体趋势比早期获得的年龄要年轻。
Zircon U-Pb ages of three meta-acidic volcanic rocks from the Wudangshan Group , southern Qinling Mountains , Central China , are reported in this paper by means of LA-MC-ICPMS.Thedating results show that the age of the meta-acidic volcanic rock is 675.2±3.1Ma ( MSWD=3.7 ),which constrains that the Wudangshan Group contains Nanhuan ( Cryogenian ) Period components.The Wudangshan Group is mainly composed of volcanic rocks of various ages and minor sedimentary rocks ,demonstrating complex deformation and metamorphism and including poly-phases of magmatic rocks.Some meta-acidic volcanic rocks in the Wudangshan Group have similar agewith the volcanic rock in the Yaolinghe Group and the basic intrusive rocks in the Wudangshan Group , indicating possible genetic relationship between the acidic volcanic rocks with the basic intrusive rocks in the Wudangshan Group and the Yaolinghe Group volcanic rock.Based on the available isotopicdating , it can be concluded that the age span of the Wudangshan Group extends from the Archean to the Mesozoic , but the general trend of the recently acquired agedata are younger than those obtained earlier.