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浙江中生代火山岩时代厘定和问题讨论:兼评Lapierre等关于浙江中?…
引用本文:陶奎元,邢光福.浙江中生代火山岩时代厘定和问题讨论:兼评Lapierre等关于浙江中?…[J].地质论评,2000,46(1):14-21.
作者姓名:陶奎元  邢光福
作者单位:中国地质科学院南京地质矿产研究所火山地质矿产研究中心,210016
摘    要:浙江中生代火山岩的时代长期以来存在不同意见,主要分岐为浙江磨石山群和浙西建德群时代窨是晚侏罗世、早白垩世、抑或晚白垩世。Lapierre等(1997)的一文中据两条Rb-Sr等时线年龄,给出了如下论断;浙西火山活动(建德群)时代为124Ma,划归为第一幕第一次岩浆事件;浙东(磨石山群)时代为97Ma,划归为第一幕第二次岩浆事件,而第二幕岩浆事件(指永康群)时代〈97Ma,本文就Lapierre等文

关 键 词:中生代  火山活动时代  火山岩  时代厘定

Determination of and Discussion on the Ages of Mesozoic Volcanic Rocks in Zhejiang--Comments on the argumentation of Lapierre et al.
Tao Kuiyuan,Xing Guangfu,Yang Zhuliang,Mao Jianren,Zhao Yu,Xu Naizheng.Determination of and Discussion on the Ages of Mesozoic Volcanic Rocks in Zhejiang--Comments on the argumentation of Lapierre et al.[J].Geological Review,2000,46(1):14-21.
Authors:Tao Kuiyuan  Xing Guangfu  Yang Zhuliang  Mao Jianren  Zhao Yu  Xu Naizheng
Abstract:The ages of Mesozoic volcanic rocks in Zhejiang Province have been controversial for a long time. The major divergence lies in whether they belong to the late Jurassic, early Cretaceous or late Cretaceous. Lapierre et al. (1997) concluded on the basis of two Rb-Sr isochron ages that the Jiande Group volcanism (124 Ma) in western Zhejiang should be grouped into the first mag-matic event of Episode I , the Moshishan Group volcanism (97 Ma) in eastern Zhejiang into the second magmatic event of Episode I ,and the Yongkang Group volcanism (<97 Ma) in eastern Zhejiang into Episode I . Based on plentiful isotopic dating data and geological studies, the authors , in this paper, discuss the geological meanings of the two isotopic ages given by Lapierre et al. , and conclude; (1) Mesozoic volcanic activities in Zhejiang are most frequent in 130-83 Ma, that is, from the early to late Cretaceous but not the late Jurassic; (2) The Jiande and Moshishan groups are nearly in the same period and not in an upper-lower stratigraphic relationship with each other;(3) The period of 110-100 Ma is a transitional stage from the early high-K calc-alka-line dacite-rhyolite (associated with diorite-granodiorite) to the late basalt-rhyolite(associated with K-feldspar granite-alkali granite).
Keywords:Mesozoic  ages of volcanics activities  Zhejiang Province
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