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地质通报  2010 

黔东南―桂北地区四堡群凝灰岩锆石SHRIMPU-Pb年龄及其地层学意义

, PP. 1259-1267

Keywords: 黔桂地区,四堡群,斑脱岩,锆石SHRIMPU-Pb定年,“江南造山带”

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Abstract:

首次获得黔桂地区晚前寒武纪四堡群凝灰岩(斑脱岩)锆石SHRIMPU-Pb年龄,结合新获得的侵位于四堡群的花岗岩锆石SHRIMPU-Pb年龄,将四堡群明确定位于新元古界。“江南造山带”普遍发育的新元古代四堡群(梵净山群、冷家溪群、双桥山群)和上覆的丹州群(下江群、板溪群、河上镇群)均为低变质绿片岩系,构成了江南古陆的变质基底。多年来四堡群一直划归中元古界,并且构成“四堡运动”的主体,其时代的定位一直影响着整个江南古陆变质基底的地层划分和对比,也制约着中国地质学家对江南造山带的地质背景和成矿条件解疑。通过对四堡群及其上覆地层中斑脱岩锆石的研究,精确地测定并获得了四堡群斑脱岩锆石的年龄841.7Ma±5.9Ma和黔东南摩天岭地区侵入四堡群的花岗岩锆石的年龄826.8Ma±5.9Ma。

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