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地质论评  2010 

豫西汝阳盆地九店组凝灰岩锆石SHRIMPU-Pb测年及其对含恐龙化石地层年代约束

Keywords: 豫西,汝阳盆地,下白垩统,地层,锆石SHRIMPUPb测年

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Abstract:

豫西汝阳盆地蟒川组陆相地层发育大型恐龙等动物化石,含化石的蟒川组与上覆、下伏地层序列和时代存有争议。通过汝阳盆地陆相地层野外系统调查,厘定了含恐龙地层―沉积序列及时代归属。在汝阳盆地早白垩世九店组凝灰岩中获得锆石SHRIMPUPb年龄为133~130Ma,结合九店组―陈宅沟组―蟒川组地层序列、沉积特征和接触关系等,认为汝阳盆地恐龙动物群及其赋存地层时代为早白垩世晚期。

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