Discovery of Large-Scale Silurian Ancient Delta Deposition System in Longmu Co Area, <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:City w:st="on">Qinghai-Tibetan Plateau</st1:City>, <st1:country-region w:st="on">China</st1:country-region></st1:place> and Its Significance <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

Discovery of Large-Scale Silurian Ancient Delta Deposition System in Longmu Co Area, Qinghai-Tibetan Plateau, China and Its Significance

详细信息

责任者：Xia Jun (Anhui Institute of Geological Survey ; Hefei 230001 ; China) ; Wang Lutai
刊名：Geological Bulletin of China
出版年：2009
卷期：28(9)
关键词：三角洲沉积作用 ; deltaic sedimentation ; 沉积体系 ; depositional system ; 青藏高原 ; Qinghai-Tibetan Plateau
页码：p.1267-1275
图表：4 illus., 1 plate, 32 refs.
分类号：0803
issnNo：ISSN1671-2552
isbnNo：CN11-4648/P

摘要

During Silurian Period, the environment of study area has experienced four evolution stages: open sea platform, blocking gulf, delta and tidal flat. There is a large ancient delta deposition in the Lower Part of the Danmianshan Formation, and it is made up of the former and delta, the delta front and the delta plain. The triage river of delta plain, natural levee, river burst fan and segregation between the bay and lakes, swamps and other micro-phases of the ancient delta are developed and the sediment thickness is very big. The discovery of the large delta deposits, the frequent change between land and ocean, the unconformity between the Middle-Upper Devonian and Ordovician-Silurian around Wuzhishan, east of Longmu Co, these evidences have proven that the norther side of Longmu Co-Shuanghu suture zone was affected by the late Caledonian movement and it is distinctly different from the sediment structure in southern Qiangtang area.

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