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赣南—粤北版石群及其地质时代
引用本文:巫建华,张树明,周维勋.赣南—粤北版石群及其地质时代[J].地层学杂志,1999,23(3):226-233.
作者姓名:巫建华  张树明  周维勋
作者单位:华东地质学院,江西,临川,344000
摘    要:赣南—粤北中生代晚期存在上、中、下3个不同时代的火山岩系,其中上火山岩系称为版石群。根据岩性岩相特征,版石群可进一步划分为两个岩组:下岩组称为合水组,以砾岩、砂岩、页岩等沉积岩为主、夹火山岩,代表火山活动初始期的产物;上岩组称为优胜组,岩性为流纹岩、流纹质凝灰岩、熔结凝灰岩,代表火山活动喷发期的产物。长塘盆地优胜组熔结凝灰岩全岩RbSr等时线年龄为89.5Ma;仁差盆地优胜组流纹岩全岩RbSr等时线年龄为91.9~94Ma,熔结凝灰岩锆石UPb法年龄为86.5Ma,次流纹斑岩锆石UPb法年龄为93.5Ma;菖蒲盆地优胜组流纹岩全岩RbSr等时线年龄为104Ma;版石盆地优胜组流纹岩全岩RbSr等时线年龄为72.2Ma,全岩KAr法年龄为77.6Ma,可见版石群优胜组的地质时代为早白垩世晚期—晚白垩世早期。另外,合水组的生物化石反映出早白垩世的特征,因此,将版石群置于早白垩世—晚白垩世早期是可信的。

关 键 词:版石群  合水组  优胜组  江西  广东  白垩纪

Banshi Group in South Jiangxi-North Guangdong and Its Geological Age
Wu Jianhua,Zhang Shuming,Zhou Weixun.Banshi Group in South Jiangxi-North Guangdong and Its Geological Age[J].Journal of Stratigraphy,1999,23(3):226-233.
Authors:Wu Jianhua  Zhang Shuming  Zhou Weixun
Abstract:There are three igneous rock series during the Late Mesozoic era in South Jiangxi—North Guangdong:upper,middle,and lower igneous rock series.The upper ig neous rock series is called Banshi Group,which can be subdivided into the Heshui and Yousheng Formations.The Heshui Formation is mainly sedimentary rock and interstrati fies proclastic rock representing the product of the initial volcanic activity and the Yousheng Formation isignimbrite,rhyolite,and rhyotaxitictuffand sometimesinterstrati fies sandstone,which stands for the product ofvolcanic eruption.The whole rock Rb Sr isochron age ofthe ignimbrite in the Yousheng Formation in Changtang Basin is 89 5Ma, while thatofthe rhyolite in the Yousheng Formation is1 0 4Ma in Changpu Basin,91 .9~ 94Ma in Rencha Basin,72 .2 Ma in Banshi Basin.The whole rock K Arisochron age ofthe rhyolite is77.6 Main Banshi Basin.Consequently,thegeologicalageofthe Banshi Group is from Early Cretaceous to early Late Cretaceous.
Keywords:Banshi Group  Heshui Formation  Yousheng Formation  Jiangxi  Guang  dong  Cretaceous
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