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青岛灵山岛下白垩统湖泊风暴沉积与风暴岩*
投稿时间:2019-08-09  修订日期:2019-11-17  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020040
摘要点击次数: 106
全文下载次数: 91
作者单位E-mail
钟建华 中国石油大学(华东) 957576033@qq.com 
郝兵 中国石油大学(华东)  
倪良田 中国石油大学(华东)  
孙宁亮 中国石油大学(华东)  
宋冠先 中国石油大学(华东)  
薛纯琦 中国石油大学(华东)  
邵珠福 东北石油大学  
毛毳 东北石油大学  
葛毓柱 波鸿鲁尔大学  
陈彬 成都理工大学  
刘圣鑫 中国地质科学院地质力学研究所  
曹梦春 中国石油大学(华东)  
刘闯 中国石油大学(华东)  
彭超峰 中国石油大学(华东)  
谷东辉 中国石油大学(华东)  
王永强 中国石油大学(华东)  
李聪 中国石油大学(华东)  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:灵山岛背来石剖面发育了非常典型的风暴岩及其风暴作用。非常典型的丘、洼状构造发育在火山岩和砂页岩过渡带。丘状构造呈典型的丘状,规模不一,小者高数厘米,宽数十厘米;大者高2.2米,宽12.8米;具有典型的二元结构:底部为灰色或浅灰色的砾岩或砂岩,顶部为深灰色-黑色泥岩、页岩或砂岩互层。砾岩分选磨圆均很差,砾石主要为片麻岩,直径多在数毫米到2-3厘米,呈悬浮式胶结。砾岩底部为凹凸不平的侵蚀面,砾岩向丘状构造两翼变薄甚至尖灭,与下部侵蚀面呈典型的角度交切。丘状构造的上部的细粒层有四个要素:①上凸形态;②丘状交错层理;③下细上粗的二元结构;④底部具侵蚀面。洼状构造也具有典型的洼状,规模也不一,小者高数厘米,宽十余厘米;大者高2米,宽18.7米,具有下细上粗的(反)二元结构,但底部多为深灰-灰黑色、甚至黑色的泥岩、页岩或夹薄层砂岩,上部多为砂岩、砂砾岩或砾岩。完整的洼状构造也有四个要素:①下凹形态;②洼状交错层理;③下细上粗的(反)二元结构;④底部具侵蚀面。丘状构造与洼状构造在空间上相邻共生,但不是同时形成的,一个连续的完整序列是丘状构造形成在先,洼状构造形成在后,其间由一个粒度较细的薄层分隔开。
中文关键词:风暴  风暴沉积  风暴岩  丘状构造  洼状构造  (反)二元结构  湖泊  灵山岛
 
Lacustrine storm and tempestite of lower Cretaceous in Lingshan island, Qingdao, Shandong
Author NameAffiliationE-mail
Zhong Jiianhua China University of Petroleum(East China) 957576033@qq.com 
HaoBing China University of Petroleum(East China)  
Ni Liangtian China University of Petroleum(East China)  
Snu Ningliang China University of Petroleum(East China)  
Song Guanxian China University of Petroleum(East China)  
Xue Chunqi China University of Petroleum(East China)  
Shao Zhufu Northeast Petroleum University  
Mao Cui Northeast Petroleum University  
Ge Yuzhu Ruhr-Universität Bochum  
Chen Bin Chengdu University of Technology  
Liu Shengxin Institute of geomechanics, Chinese academy of geological sciences  
Cao Mengchun China University of Petroleum(East China)  
Liu Chuang China University of Petroleum(East China)  
Peng Chaofeng China University of Petroleum(East China)  
Gu Donghui China University of Petroleum(East China)  
Wang Yongqiang China University of Petroleum(East China)  
Li Cong China University of Petroleum(East China)  
Abstract:On the basis of detailed analysis of sedimentary facies and strata geometry, the present study reinterprets the Laiyang Formation (Lower Cretaceous, Lingshandao, Qingdao), previously considered as a depositional system of deep-water, as a plate subduction depositional system. In the sandstone beds of the LF, planar, low-angle and undulating laminations with weakly asymmetric hummocky and swaley bedforms, combined-flow ripples, accretionary hummocky and swaley cross-stratification-like (HCS-like and SCS-like), and anisotropic HCS-like and SCS-like suggest the action of oscillatory currents combined with unidirectional currents in forming the deposits. Most storm sediments and tempestite presently recognized lie in south Beilaishi profile, but surprisingly, equally as many may have also occurred in north Beilaishi profile and that have most distinct and perfect features of storm sediments and tempestite. Cyclic deposits containing hummocky and swaley cross-stratification occur in the upper part of the Lingshan Island Sandstone of Qingdao, a shallow lake transgressive sandstone of Early Cetaceous age on the Lingshan Island. The cycles average 1.6 m in thickness and consist, where complete, of x javascript; an upper hummocky cross-stratified sandstone, a middle planar and ripple bedded sandstone with a shale bed in its middle part, and an upper bioturbated sandstone. Noteworthy features of the hummocky cross-stratification include the presence of depositional and eroded storms and tsunamis have differences, but also commonalities such as onshore flooding and infrastructure damage domes in addition to scoured depressions, the absence of significant bedform migration, and the presence of a small proportion of dip angles greater than the angle of repose (>55 °) in addition to the large proportion of low (<15°) dip angles. The lower, stratified, fining-upward part of the cycle (up to the top of the shale bed) is interpreted as having accumulated under conditions of initially great but gradually decreasing current velocity and deposition rate. The currents probably had a strong oscillatory component, and the depositional event is inferred to have been a storm. The part of the planar- and ripple-bedded sandstone above the shale bed was probably deposited during relatively fair weather after the storm but before re-establishment of a normal benthic fauna. The bioturbated sandstone is interpreted to have been deposited during fair weather or during minor storms separated by long intervals of fair weather. Recentlly, a set of sandstone hummocky cross-stratification is coming to be recognized in sedimentary deposits on Lingshan Island. In this paper we described an excellent example of lacustrine sandstone characterized by cycles of storm and nonstorm layers and by hummocky and swaleyy cross-stratification in the storm layers. The present paper focuses on the part of the sequence that is characterized by storm-nonstorm cycles and associated hummocky cross-stratification. We give some new descriptive details of hummocky cross-stratification and offer a more detailed interpretation of the storm processes than has previously been attempted. The HCS beds range a few decades of centimenters to 220 cm thick and contain well-preserved hummocks, which are generally asymmetric with steeper ends to the east. The heights of HSC and SCS are in many cases up to more than 1 meter. Key words:Storm; storm sediments; tempestite; hummocky structure; swaley structure; (anti)dual structure; lacustrine and Lingshan island
keywords:Storm  storm sediments  tempestite  hummocky structure  swaley structure  (anti)dual structure  lacustrine and Lingshan island
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