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1、安徽巢北早三疊世南陵湖灰?guī)r中的灰涌構(gòu)造及其成因意義遲元林 鐘建華 周瑤琪 陳書(shū)平 王紹蘭 朱光有 孫國(guó)忠 摘 要 安徽巢北早三疊世南陵湖組的灰?guī)r中發(fā)育了一種非常特殊的構(gòu)造,我們將其稱為“灰涌”(limeblow),因?yàn)樗鼈冊(cè)谛螒B(tài)、結(jié)構(gòu)及成因上非常類似于由地震噴沙形成的砂涌(sandflow)。這種灰涌形態(tài)上呈蘑菇狀或傘狀,由涌道、涌盤及涌口三部分組成,但后者有時(shí)可以不發(fā)育。涌道呈直立圓柱狀,高30~50cm,直徑0.2~2cm,但常因灰泥的流動(dòng)而“愈合”;涌道之上為涌盤,大部分呈鐵餅形,直徑在5~40cm,高1~8cm,多數(shù)在3~5cm。部分中心有一凹坑(涌
2、口),凹坑直徑在1~3cm,深度一般不超過(guò)1cm。涌盤內(nèi)部具有紋層結(jié)構(gòu),由黃褐色泥灰紋層和淺灰色泥晶灰?guī)r紋層交互所形成的。研究表明,前者系沉積所形成,而后者系地震噴涌所形成。結(jié)合模擬實(shí)驗(yàn)推測(cè)灰涌的成因可能與地震有關(guān)。通過(guò)對(duì)1號(hào)灰涌層的研究發(fā)現(xiàn),有的灰涌是由二十次左右(5個(gè)幕)地震形成的?! £P(guān)鍵詞 灰涌;地震;巢北 中圖法分類號(hào) P584ThelimeblowintheNanlinghulimestoneofearlyTriassicperiodinnorthChaohu,Anhui:ItsgenesisandsignificanceChiYuanlin(
3、ChangchunScienceandTechnologyUniversity,Changchun,130026)ZhongJianhuaZhouYaoqiChenShupingWangShaolanZhuGuangyouandSunGuozhong(ResourceandEnvironmentInstitute,ChinaUniversityofPetroleum,Dongying,257062) Abstract AkindofunusualsedimentarystructuredevelopedintheNanlinghulimestoneofear
4、lyTriassicperiodinnorthChaohu,Anhuiprovince,whichiscalledas“l(fā)imeblow”,becauseitresemblesthesandblowinshape,structureandgenesis.Thesandblowwasformedbyearthquakes.ThelimeblowinnorthChaohuhastheappearancelikemushroomorumbralleandconsistsofthreeparts:blowchannel(duct),blowdishandblowmout
5、h,butthelatterdoesnotoftenemerge.Theblowchannelislikeacylinder,with30~50cmheightand0.2~2cmindiameter,nevertheless,theblowchanneloftenappearstobeclose.Overtheblowchannelthereisablowdish,mostofwhicharelikediscus,being5~40cmindiameterand1~8cminheight.Partsofblowdishhaveoneortwotothreebl
6、owmouthesintheircentersorneartheircenters.Theblowmouthisamong1~3cmindiametersandnotmorethanonecentimeterindepth.Theblowdishhaslaminaestructures,whichwasformedbyalternationofyellowishbrownargillaceouslimestonelaminaeandlightgreymicritelimestonelaminae.Basedonthestudies,theargillaceous
7、limestonelaminaeisthoughttobeformedbynormaldeposition,nevertheless,themicritelimestonelaminaebyeffusionformedbyearthquakes.Thestudyoflime-blow-layerⅠhassuggestedthatithadbeenformedbyabout20timesearthquakes(5earthquakeepisodes). Keywords Limeblow,Earthquake,Chaobei 地震導(dǎo)致沉積物流體化,同時(shí)形成異
8、??紫秹毫?使地下松散砂