Flow Phenomena within the Jurassic Accretionary Complexes of Northeast Japan.

日本东北部侏罗纪增生杂岩内的流动现象。

• 批准号: 02640591
• 负责人: KAWAMURA Makoto
• 金额: $ 1.22万
• 依托单位: Faculty of Science, Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02640591/
• 关键词: Accretionary complex; Mud injection; Sandstone sill-dyke; Pore-fluid; Melange; 泥ダイアピル; 砂岩シル; 渡島帯; 北部北上帯; 砂岩岩脈; 過剰間隙水圧; ダイアピル; 水圧破砕; 高間隙水圧

The intention of this study is to exhibit the fluid-involving flow phenomena, such as mud-injection, sand sill - dyke, fluidized structure noted in the Mesozoic accretionary complexes (the Oshima Belt, Idon'nappu Belt and the Northern Kitakami Belt) of Northeast Japan, and to interpret the significance of the pore-fluid behavior in accretionary complex.Mud Injection : Pebbly mudstone bodies as a result of mud injection is observed in the Cape Shiragami Area on a small scale. It intrudes and injected into the turbiditic alternation and green rocks. Geometry of the mud injection is generally thin veinlet (-film) sometimes branched, but shows irregularly impregnating network-form in a case. Host rocks of clastic alternation were tectonically deformed clearly before the injection. Jigsaw-puzzle structure is occasionally recognized in the inclusion. Such intrusion/injection were caused by the fluidization of underconsolidated muddy sediments under high confining pressure and excess pore-flu … More id pressure within relatively consolidated host rocks in the decollement/thrust zone of comparatively deep part of accretionary complex.Sand Sill - dyke : Sills/dykes of coarse-grained sandstone are recognized in the turbiditic alternation in the Orito-hama coast, Oshima Belt.They are classified as follows : dykesill transitional type, multi-branching type, pinch-and-swell veinlet swarm type and thick planar type. Peculiar structure as pod-like "reservoir" in a sill, which "injects" several thin branched veins, is occasionally observed in this type. It is concluded that the "fluidized sand" with high pore-pressure was pushed into the semi-consolidated host rock like syringe, and injected as branched veins in consequence of hydraulic fracturing induced when the pore-pressure of the sand exceeded the strength of wall-rock.Fluidization - injection phenomena described above reveal that the flow (-intrusion) process of wet-sediment take place extensively in accretionary complex. And it suggests that the behavior of pore-fluid is deeply concerned with the formative mechanism of the mixed facies characteristic of accretionary complex. Less

这项研究的目的是表现出涉及流体的流动现象，例如在中生代增生络合物（Oshima Belt，Idon'nappu带和Kitakami北部）中指出的在日本东北日本的中生代（Oshima Belt，Idon'nappu带和北部的Kitakami Beld）中指出的日本东北部的重要性泥泞的泥泞的行动中的重要性。由于在Shiragami角（Cape Shiragami）地区观察到泥浆的结果。它侵入并注入浊度替代品和绿色岩石。泥浆注射的几何形状通常是薄的静脉（-film）有时分支的，但在情况下显示出不规则浸渍的网络形式。注射之前，经典替代方案的宿主岩石在构造上很明显。拼图嘴结构偶尔在包含中得到认可。这种侵入/注射是由高限制压力和过量孔隙释放下的固结糊状沉积物的流动性引起的……在相对固结的宿主岩石中，在相对固结的宿主岩石内的id压力更大。皮带。它们分类如下：堤坝过渡类型，多分支类型，捏杆脉脉群类型和厚的平面类型。在这种类型的情况下，有时会观察到奇特的结构，作为窗台中的豆荚状“储层”，它“注入”了几个薄的分支静脉。得出的结论是，将“流动性沙子”推入半固结的宿主岩石中的“流动性沙子”（如注射器），并作为孔压力诱发的孔压力在沙子上诱发的孔隙压裂而被注射为分支静脉，当沙子的孔隙压力超过了壁rock的强度超过了壁rock的强度。 复杂的。这表明孔流体的行为与增生复合物的混合设施特征的形成机理深深关注。较少的