Clastic Tempestite and Its Significance in Yinmin Formation, Kunyang Group (Me soproterozoic)in Central Yunnan Province

DU Yuan sheng; HAN Xin

Kunyang Group of Mesoproterozoic in central Yunnan province consists of 4 Formations: Yinmin Formation, Luoxue Formation, Etouchang Formation and Luzhi j iang Formation. Yinmin Formation is composed of clastic stone with the sedimenta ry structures developed characteristically in storm deposits, which includes gut ter casts, hummocky or sunken cross bedding, and graded bedding. The storm depos its consist of 4 types of lithofacies: a-sandstone with gutter casts and graded bedding, b-sandstone with hummocky or sunken cross bedding, c-siltstone and muds tone with homogeneous bedding, and d-argillite with horizontal bedding. These l ithofacies represent respectively deposits of storm current (a), deposits of sto rm wave(b), rapid suspended sediment (event deposits, c) and slow suspended sed iment (background deposits, d). These lithofacies constitute various sedimentary sequences of storm deposits. Sequence 1 is an assemblage upward of graded sands tone with gutter casts, sandstone with hummocky or sunken cross bedding, siltsto ne and mudstone with homogeneous bedding, and argillite with horizontal bedding. Sequence 2 is of graded sandstone with scouring casts, sandstone with parallel bedding, sandstone with wave ripple cross bedding and siltstone and mudstone wit h homogeneous bedding and horizontal bedding. Sequence 3 is of sandstone with hu mmocky or sunken cross bedding, fine sandstone with wave ripple cross bedding, a nd siltstone and mudstone with homogeneous bedding and horizontal bedding. The d iscovery of tempestite in Yinmin Formation, Kunyang Group of Mesoproterozoic in central Yunnan province reflects that the atmosphere, hydrosphere and their inte raction in Mesoprotozoic are similar to those in nowadays. The central Yunnan Pr ovince in Mesoprotozoic located in the area of low latitude（5°～30°） where deve loped storm. Meanwhile,the discovery of the storm deposits has important significance to explain the genesis of the sandstone with grade bedding and interpret the sequence of Kunyang Group.

China University of Geosciences, Wuhan 430074

Received Date: 1999-03-30

Rev Recd Date: 1999-05-03

Publish Date: 2000-06-10

Key words:

Abstract: Kunyang Group of Mesoproterozoic in central Yunnan province consists of 4 Formations: Yinmin Formation, Luoxue Formation, Etouchang Formation and Luzhi j iang Formation. Yinmin Formation is composed of clastic stone with the sedimenta ry structures developed characteristically in storm deposits, which includes gut ter casts, hummocky or sunken cross bedding, and graded bedding. The storm depos its consist of 4 types of lithofacies: a-sandstone with gutter casts and graded bedding, b-sandstone with hummocky or sunken cross bedding, c-siltstone and muds tone with homogeneous bedding, and d-argillite with horizontal bedding. These l ithofacies represent respectively deposits of storm current (a), deposits of sto rm wave(b), rapid suspended sediment (event deposits, c) and slow suspended sed iment (background deposits, d). These lithofacies constitute various sedimentary sequences of storm deposits. Sequence 1 is an assemblage upward of graded sands tone with gutter casts, sandstone with hummocky or sunken cross bedding, siltsto ne and mudstone with homogeneous bedding, and argillite with horizontal bedding. Sequence 2 is of graded sandstone with scouring casts, sandstone with parallel bedding, sandstone with wave ripple cross bedding and siltstone and mudstone wit h homogeneous bedding and horizontal bedding. Sequence 3 is of sandstone with hu mmocky or sunken cross bedding, fine sandstone with wave ripple cross bedding, a nd siltstone and mudstone with homogeneous bedding and horizontal bedding. The d iscovery of tempestite in Yinmin Formation, Kunyang Group of Mesoproterozoic in central Yunnan province reflects that the atmosphere, hydrosphere and their inte raction in Mesoprotozoic are similar to those in nowadays. The central Yunnan Pr ovince in Mesoprotozoic located in the area of low latitude（5°～30°） where deve loped storm. Meanwhile,the discovery of the storm deposits has important significance to explain the genesis of the sandstone with grade bedding and interpret the sequence of Kunyang Group.

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Reference (8)

[1]	Kelling G. Mullin P R. Graded limestones and limestone quartzite couple ts: possible storm-sediments[J] .Pleistocene of Massachusetts, Petrology，19 75，38:971～984
[2]	Aigner T. Schill-Tempestite in Oberen Muschlkalk (Trias, SW-deuts chland )[J] . N. Jb. Goel. Palaont. Abh.1979，157:326～343
[3]	安桐林.蓟县雾迷山组碳酸盐岩原地型风暴沉积特征及成因探讨[J] .沉积学报, 1993，11(4):30～36
[4]	周丽清,邵德艳. 北京十三陵中元古界蓟县系雾迷山组原地风暴沉积的砾屑体[J] .沉积学报，1994，12(2):72～76
[5]	杨进辉,周美玲，马力.河北平泉地区中元古界长城群高于庄组风暴浊积岩及其分形特征[J] .长春地质学院学报，1995，25(3):275～278
[6]	杜蜀宾,王翔,苏文智.蓟县地区团山子组风暴沉积[J] .西安矿业学院学报，199 5，15(3):241～245
[7]	吴懋德，段锦荪.云南昆阳群地质[M] .昆明：云南科技出版社，1990
[8]	林元弼.天气学[M] .南京：南京大学出版社，1988.195～235

[1]	Kelling G. Mullin P R. Graded limestones and limestone quartzite couple ts: possible storm-sediments[J] .Pleistocene of Massachusetts, Petrology，19 75，38:971～984
[2]	Aigner T. Schill-Tempestite in Oberen Muschlkalk (Trias, SW-deuts chland )[J] . N. Jb. Goel. Palaont. Abh.1979，157:326～343
[3]	安桐林.蓟县雾迷山组碳酸盐岩原地型风暴沉积特征及成因探讨[J] .沉积学报, 1993，11(4):30～36
[4]	周丽清,邵德艳. 北京十三陵中元古界蓟县系雾迷山组原地风暴沉积的砾屑体[J] .沉积学报，1994，12(2):72～76
[5]	杨进辉,周美玲，马力.河北平泉地区中元古界长城群高于庄组风暴浊积岩及其分形特征[J] .长春地质学院学报，1995，25(3):275～278
[6]	杜蜀宾,王翔,苏文智.蓟县地区团山子组风暴沉积[J] .西安矿业学院学报，199 5，15(3):241～245
[7]	吴懋德，段锦荪.云南昆阳群地质[M] .昆明：云南科技出版社，1990
[8]	林元弼.天气学[M] .南京：南京大学出版社，1988.195～235

Clastic Tempestite and Its Significance in Yinmin Formation, Kunyang Group (Me soproterozoic)in Central Yunnan Province

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