杨良哲,苑金玲,赵璧,陈超,李姜丽,吴奎

• 1:湖北省地质科学研究院
• 2:资源与生态环境地质湖北省重点实验室
• 3:湖北省地质调查院

摘要(Abstract)：

晚三叠世是地球生命演化的重要时期。鄂西秭归盆地、荆—当(荆门—当阳)盆地发育相对完整的上三叠统,富含植物化石,是区域大地构造、古气候研究的理想对象。通过LA-ICP-MS锆石U-Pb测年,本研究首次报道了荆—当盆地九里岗组下部沉凝灰岩夹层年龄236.7±0.9Ma(MSWD=0.83,n=15),该年龄与前人在秭归盆地获得的巴东组二段凝灰岩夹层年龄237.5±2 Ma误差范围内一致,均位于卡尼期底界(～237 Ma)附近。荆—当盆地九里岗组、秭归盆地巴东组近同期的凝灰岩夹层上、下部分的古生物化石和碎屑锆石年龄谱均可较好对比,进一步证明两个凝灰岩年龄的可靠性。秭归盆地巴东组中上部可能跨度到卡尼期,荆—当盆地九里岗组中下部可能跨度到拉丁期。秭归盆地、荆—当盆地中—晚三叠世岩石地层可能具有穿时性,秭归盆地九里岗组沉积时间晚于荆—当盆地。由于鄂西九里岗组表现为一套海陆交互相沉积,因此秭归盆地海—陆沉积转换的时间可能滞后于荆—当盆地,这为华北、扬子克拉通自东向西剪刀式拼合提供了新的证据。

关键词(KeyWords)： 荆—当盆地;九里岗组;沉凝灰岩;锆石U-Pb测年;剪刀式拼合;三叠系

Abstract:

Keywords:

基金项目(Foundation): 湖北省地质局项目(KJ2025-3)资助

作者(Author): 杨良哲,苑金玲,赵璧,陈超,李姜丽,吴奎

DOI: 10.19839/j.cnki.dcxzz.2025.0008

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