海南岛北部更新世道堂组的重新厘定
Revision of the Pleistocene Daotang Formation in northern Hainan Island, China
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摘要: 根据1：25万琼海县幅区域地质调查最新资料，对《海南省岩石地层》中的第四系道堂组进行了重新厘定，在原道堂组正层型剖面上原一段与二段之问识别出沉积不整合面、超覆不整合面，从而将原道堂组划分为2个不同的组级岩石地层单位。按照岩石地层单位的命名原则，超覆不整合面之下的原道堂组一段划归新建立的下中更新统多文组；原道堂组二段、三段、四段厘定为新定义的道堂组，分别定义为新道堂组的下段、中段和上段。新厘定的道堂组的地质时代为中晚更新世。Abstract: On the basis of the latest data of 1:250000 regional geological mapping of the Qionghai County Sheet, the authors redefine the Quaternary Daotang Formation in the "Lithostratigraphy of Hainan Province". A sedimentary unconformity and an overlap unconformity are recognized between the previously established First Member and Second Member in the orthostratotype of the original Daotang Formation, thus dividing the original Daotang Formation into two formation rank lithostratigraphic units. According to the naming principle of lithostratigraphic units, the First Member of the original Daotang Formation below the overlap unconformity is assigned to the newly established Duowen Formation, while the Second, Third and Fourth members in the upper part of the original Daotang Formation above the overlap unconformity are assigned to the newly defined Daotang Formation and defined as the Lower, Middle and Upper members of the revised Daotang Formation respectively. The age of the redefined Daotang Formation is mid-late Pleistocene.
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Keywords:
- Daotang Formation /
- revision /
- mid-late Pleistocene /
- Hainan Island
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