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浙江长兴县煤山剖面二叠系-三叠系界线层序的沉积特征

, PP. 716-729

Keywords: 煤山剖面,二叠系-三叠系界线,沉积特征,海侵淹没面

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Abstract:

?二叠系-三叠系界线全球层型剖面和点位置于浙江煤山D剖面第27层内Hindeodusparvus的首现面.第27层通常被视为均质的粉砂质灰岩,界线上下的沉积特征没有发生变化.深入研究界线层序的结果表明,第27层内二叠系-三叠系界线之下约2cm处有典型的发育Glossifungites遗迹相的固结基底(firmground)构造,在此构造面之上,不仅二叠纪生物碎屑的含量显著降低,碳酸盐沉积也由碳酸钙为主突然转变为白云石为主.本固结基底标志着二叠纪最末期快速海侵的到来及沉积环境和古气候的重大转变.这一海侵淹没面也见于华南浅水台地相的浙江黄芝山剖面、下斜坡-盆地边缘相的湖南江垭剖面和深水盆地相的安徽平顶山剖面,以及冈瓦纳大陆北缘的西藏色龙剖面,代表了二叠纪-三叠纪之交一次全球性快速海侵的开始.

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