Depositional mechanisms of deep-sea coarse clastic sediments, Cap Enragé Formation, Quebec
Depositional mechanisms of deep-sea coarse clastic sediments, Cap Enragé Formation, Quebec
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魁北克 Cap Enragé 组深海粗碎屑沉积物的沉积机制
DOI：
10.1139/e82-020
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发表时间：
1982
影响因子：
1.4
通讯作者：
F. Hein
中科院分区：
文献类型：
--
作者：
F. Hein
寒武-奥陶系盖层深海沉积物主要由6种相组成：（1）粗砾岩相;（2）粒级-层状/交错层细砾岩相;（3）分散含砾砂岩相;（4）液化含砾砂岩相;（5）不粒级交错层细砾岩和含砾砂岩相;（6）块状砂岩，相1和相2层的粗粒部分在层理中具有单峰颗粒取向，具有单峰a轴叠瓦状。较细的相2层在层理中具有单峰或双峰颗粒取向，具有双峰（向上和下游）a轴叠瓦状。相3、4和6层在层理中具有单峰、双峰或随机的颗粒取向。a轴叠瓦构造的变化规律如下：相3以双峰式为主，相4以双峰或单峰式为主，相6以单峰式为主。相5层是由强烈的底流（流速70-125 cm/s）（？） 稀释溢出流）。所有其他相沉积主要集中碎屑分散.
Cambro-Ordovician Cap Enrage deep-sea sediments consist of six main facies: (1) coarse conglomerates; (2) graded–stratified/cross-bedded fine conglomerates; (3) dispersed pebbly sandstones; (4) liquefied pebbly sandstones; (5) ungraded cross-bedded fine conglomerate and pebbly sandstones; (6) massive sandstones.Facies 1 and coarser parts of facies 2 beds have unimodal grain orientations in bedding, with unimodal a-axis imbrications. Finer facies 2 beds have unimodal or bimodal grain orientations in bedding, with bimodal (up- and downstream) a-axis imbrications. Facies 3, 4, and 6 beds have unimodal, bimodal, or random grain orientations in bedding. The a-axis imbrications vary as follows: mainly bimodal for facies 3, bimodal or unimodal for facies 4, and dominantly unimodal for facies 6.Facies 5 beds result from fractional reworking of previous deposits by strong bottom currents (velocities 70–125 cm/s) (? dilute spillover flows). All other facies were deposited mostly from concentrated clast dispersions ...