Hummocky cross-stratification and its formation : Approaches from flume experiments and field observation

丘状交叉分层及其形成：水槽实验和现场观察的方法

• 批准号: 09440180
• 负责人: MASUDA Fujio
• 金额: $ 5.31万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09440180/
• 关键词: hummocky cross-stratification; Flume experiment; sedimentary structure; stratum; bed form; HCS; storm deposits; antidunes; 地層; ヘリンボーン構造

Hummocky cross-stratification(HCS)is a primary sedimentary structure and is observed in ancient shallow marine deposits of various geologic ages in many world localities. HCS is interpreted as a storm deposits formed by waves or combined oscillatory and unidirectional flows. The structure continues to be focus of ongoing debate regarding its mode of formation and paleohydrodynamic interpretation. In this research we try to clarify the depositional processes and formation of HCS based on two approaches, laboratory flume experiments and field observations.Following new achievements can be obtained and published the report of "Hummocky cross-stratification and its formation".1)HCS is formed under the two conditions, oscillatory and unidirectional flows.2)HCS has a wave-length from several cm to several tens m in natural condition.3)HCS is composed of a wide range in grain-size of coarse silt to granule.4)Typical HCS structure with hummocky and swaley forms was constructed under the condition of plane-bed antidune in upper flow-regime.5)Oscillatory HCS may be formed in a wide range of ripple, plane-bed and antidune fields.6)Discrete oscillatory HCS storm bed was formed during combined flows and following waning oscillatory flow conditions.

Hummocky交叉分层（HCS）是一种主要的沉积结构，在许多世界地区的各种地质​​时代的古代海洋沉积物中都观察到。 HCS被解释为由波浪形成或振荡和单向流的组合形成的风暴沉积物。该结构继续是关于其形成方式和古水动力解释方式的持续辩论的重点。在这项研究中，我们试图根据两种方法（实验室水槽实验和现场观察）来阐明HCS的沉积过程和形成。可以获得新成就，并发表“ Hummocky交叉分层及其形成”的报告。1）HCS）HCS HCS）在两个条件下形成振荡和单向流。2）HCS的波长度从几厘米到自然条件下的几十m。3）HCS由粗淤泥到颗粒的晶粒大小的谷物尺寸范围很广。 4）典型的HCS结构具有鹰嘴豆和swaley形式的形式是在上流度调节中的平面床反利调的条件下构建的。5）振荡性HC可以在各种涟漪，平面床和反元素范围内形成。6）离散。振荡性HCS风暴床是在流动的混合过程中形成的，并在振荡流下降之后形成。

项目成果

Kubo Y.: "Spatical variation of paleocurrent velocities estimated from a turbidite of the Mio-Pliocene Kiyosumi Formation in Boso Peninsula,Japan"Jour. Geol. Soc. Japan. 104(6). 359-364 (1998)

Kubo Y.：“根据日本房总半岛 Mio-上新世清澄组浊积岩估算的古水流速度的空间变化”Jour。

Kubo,Y., Masuda. F., Tokuhashi, S. and Sakai, T.: "Spatical variation of paleocurrent velocities estimated from a turbidite of the Mio-Pliocene Kiyosumi Formation in Boso Peninsula, Japan"J. Geol. Soc. Japan. 104 (6). 359-364 (1998)

久保，Y.，增田。

Yokokawa,M.: "Sedementary structures generated in upper flow-regime with sediment supply : Antidune cross-stratification in a flume"Proceeding Prof . K. O. Emery Commemorative Workshop on Land-Sea Link in Asia. 409-414 (1999)

横川，M.：“在具有沉积物供应的上部流态中生成的沉积结构：水槽中的反丘陵交叉分层”Prof.

Endo,N.: "Ripples in clune regime and interpretation about dunes-missing in turbidite" Jour Creol.Soc.Japan. 103,8. 741-746 (1997)

Endo,N.：“浊流中的波纹和对浊积岩中沙丘缺失的解释”Jour Creol.Soc.Japan。

Yokokawa,M., Masuda, F., Sakai, T., Endo, N. and Kubo, Y.: "Sedimentary structures generated in upper flow-regime with sediment supply: Antidune cross-stratification in a flume."Proceeding Prof.K.O.Emery Commemorative Workshop on Land-Sea Link in Asia. 40

Yokokawa,M.、Masuda, F.、Sakai, T.、Endo, N. 和 Kubo, Y.：“在具有沉积物供应的上部流域中生成的沉积结构：水槽中的反沙丘交叉分层。”