文档介绍：安徽巢北早三叠世南陵湖灰岩中的灰涌构造及其成因意义迟元林钟建华周瑶琪陈书平王绍兰朱光有孙国忠摘要安徽巢北早三叠世南陵湖组的灰岩中发育了一种非常特殊的构造,我们将其称为“灰涌”(lime blow), 因为它们在形态、结构及成因上非常类似于由地震喷沙形成的砂涌(sand flow) 。这种灰涌形态上呈蘑菇状或伞状,由涌道、涌盘及涌口三部分组成,但后者有时可以不发育。涌道呈直立圆柱状,高30~50cm, 直径 ~2cm, 但常因灰泥的流动而“愈合”;涌道之上为涌盘,大部分呈铁饼形,直径在 5~40cm, 高1~ 8cm, 多数在 3~5cm 。部分中心有一凹坑(涌口),凹坑直径在 1~3cm, 深度一般不超过 1cm 。涌盘内部具有纹层结构,由黄褐色泥灰纹层和浅灰色泥晶灰岩纹层交互所形成的。研究表明,前者系沉积所形成,而后者系地震喷涌所形成。结合模拟实验推测灰涌的成因可能与地震有关。通过对 1号灰涌层的研究发现,有的灰涌是由二十次左右(5个幕)地震形成的。关键词灰涌;地震;巢北中图法分类号 P584 The lime blow in the Nanlinghu limestone of early Triassic period in north Chaohu,Anhui:Its genesis and significance Chi Yuanlin (Changchun Science and Technology University,Changchun ,130026 ) Zhong Jianhua Zhou Yaoqi Chen Shuping Wang Shaolan Zhu Guangyou and Sun Guozhong (Resource and Environment Institute,China University of Petroleum,Dongying ,257062 ) Abstract Akind ofunusual sedimentary structure developed inthe Nanlinghu limestone ofearly Triassic period innorth Chaohu,Anhui province,which iscalled as“lime blow ”,because itresembles the sand blow inshape,structure and sand blow was formed by lime blow innorth Chaohu has the appearance like mushroom orumbralle and consists ofthree parts: blow channel(duct), blow dish and blow mouth, but the latter does not often emerge. The blow channel islike acylinder,with 30~50cm height and ~2cm in diameter,nevertheless,the blow channel often appears the blow channel there isablow dish,most ofwhich are like discus,being 5~ 40cm indiameter and 1~8cm ofblow dish have one ortwo tothree blow mouthes intheir centers ornear their blow mouth isamong 1~3cm indiameters and not more than one centimeter blow dish has laminae structures,which was formed byalternation of yellowish brown argillaceous limestone laminae and light grey micrite limestone laminae. Based onthe studies, the argillaceous limestone laminae isthought tobeformed bynormal deposition,nevertheless,the micrite limestone laminae byeff