摘要:
作者与项目同仁于2008年9月~2010年实施项目辖区1:5万区调地质填图期间发现,前人资料对该区晚寒武世岩石地层的划分,或因当时地质构造背景尚未弄清,或因年代地层、生物地层的惯性犹存,以致同一地层小区内同一组界并无明确、稳定的岩性划分标志,令同行临场操作难以掌握。遂在测区填图、实测剖面的基础上,通过实地考察富宁小区相关地层剖面,充分尊重并务实引用前人涉区调研所获化石成果,循岩石地层要义,重新厘定调研区所属富宁小区晚寒武世岩石地层层序略为:唐家坝组(∈3t)台地潮坪相碳酸盐岩,"大老堡组"("∈3d")潮坪潟湖相陆源沉积岩(下部和顶部夹有碳酸盐岩层),博菜田组(∈Ob)台地潮坪相碳酸盐岩,其中"大老堡组"为新拟建单位,上覆层位为下木都底组(O1xm)。
Abstract:
In the light of 1:50 000 regional geological mapping and section measurements during September 2008-2010 period and relevant previous data, the authors in the present paper propose a new scheme of re-establishment and redivision of the Late Cambrian strata in the Funing stratigraphic microrealm east of the Wenshan-Malipo fault zone in eastern Yunnan. The lithostratigraphic sequences consist,in an ascending order, of the platform-tidal flat carbonate rocks in the Tangjiaba Formation (∈3), the tidal flat-lagoon terrigenous sedimentary rocks (intercalated with carbonate rocks in the lower and topmost parts) in the "Dalaobao Formation"(∈3d), and the platform to tidal-flat carbonate rocks in the Bocaitian Formation (∈3Ob), of which the "Dalaobao Formation" is a proposed stratigraphic unit in this study. The overlying strata are grouped into the Xiamududi Formation (O1xm).
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