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1、第23卷增刊1期地質(zhì)與資源Vo1.23Supp.12014年7月GEOLOGYANDIESOURCESJu1.2014文章編號:1671—1947(2014)S1—0035—04中圖分類號:P512.2‘文獻(xiàn)標(biāo)識碼:A遼西凌源地區(qū)中侏羅統(tǒng)鄧杖子組沉積環(huán)境探討馬文坡,張海龍(遼寧省地質(zhì)勘查院,遼寧大連116100)摘要:通過對遼西凌源地區(qū)牛營子盆地鄧杖子組地層剖面測制,結(jié)合巖石組合、沉積構(gòu)造及相序疊置關(guān)系等因素分析研究,認(rèn)為鄧杖子組沉積環(huán)境為沖積扇相.鄧杖子組下部巖性為灰色厚層一巨厚層中一粗粒石灰?guī)r質(zhì)礫巖,沉積環(huán)境為扇根亞相,由篩積物沉積、泥石流沉積組成;
2、中部主要為灰綠色薄層中細(xì)粒長石砂巖、細(xì)粒鈣質(zhì)砂巖,夾灰色石灰?guī)r質(zhì)礫巖、含砂質(zhì)灰?guī)r等,由扇中亞相和扇端亞相組成;上部巖性為灰色中厚層一厚層夾厚層一巨厚層石灰?guī)r質(zhì)礫巖,沉積環(huán)境可識別出扇中亞相和扇根亞相,二亞相均由河道沉積和漫流沉積組成.關(guān)鍵詞:鄧杖子組;沉積環(huán)境;扇根亞相;扇中亞相;扇端亞相;遼寧省SEDIMENI'ARYENVIRONMENTOFJURASSICDENGZHANGZIFORMAⅡONINLINGYUANAREAOFSTERNUAONINGPROVINCEMAWen-po,ZHANGHai—long(LiaoningInstituteofG
3、eologicalExploration,Dalian116100,LiaoningProvince,China)Abstract:BasedonthemappingofstratigraphicsectionforDengzhangziFormationinNiuyingziBasininLingyuanarea,WesternLiaoningProvince,withcomprehensiveanalysisofrockassociation,sedimentarystructureandsuperimposedrelationsoffaciesse
4、quence,itisrecognizedthatthesedimentaryenvironmentofthisformationisMluviMfanfacies.Thelithologyofthelowerpartisthick-hugethickmedium—coarsegrainedgraylimestoneconglomerate,withsedimentaryenvironmentofrootfansubfaciescomposedofsievesedimentsanddebrisflowdeposits.Themiddlepartconsi
5、stsofmainlythingreyishgreenmedium-finegrainedarkoseandfinegrainedcalcareoussandstonewithgraylimestoneconglomerateandsandylimestone,composedofmiddleandsidefansubfacies.Theupperpartisofmediumthick—thickwiththick—hugethickgraylimestoneconglomerate,depositedintheenvironmentofmiddlean
6、drootfansubfacies,whicharebothcomposedofchanneldepositsandsheetflowdeposits.Keywords:DengzhangziFormation;sedimentaryenvironment;rootfansubfacies;middlefansubfacies;sidefansubfacies;LiaoningProvince0前言研究區(qū)地層發(fā)育較全,主要分布有長城系、薊縣鄧杖子組由長春地質(zhì)學(xué)院遼西普查大隊(duì)(1959)系、寒武系、奧陶系、侏羅系和白堊系,零星見有青白創(chuàng)名,標(biāo)準(zhǔn)地點(diǎn)在凌源鄧
7、杖子附近.筆者在從事凌源口系、二疊系.巖漿巖不發(fā)育,僅零星見有輝綠巖脈體市等4幅1:5萬地質(zhì)礦產(chǎn)調(diào)查時(shí),對該組進(jìn)行了較深侵人.褶皺構(gòu)造主要為向斜構(gòu)造,分別以鄧杖子組為人的研究,尤其是沉積環(huán)境方面做了更為詳細(xì)的分核(鄧杖子向斜)和二疊系為核的向斜構(gòu)造.核部發(fā)育析,旨在為該組區(qū)域劃分與對比開辟新的研究思路于盆地西緣邢杖子一帶,可見下白堊統(tǒng)義縣組角度不整合覆于褶皺斷裂變形的髫髻山組地層之上.所見形1地質(zhì)概況成的褶皺為一個(gè)緊閉向斜,斷裂則具有明顯的繼承收稿日期:2014—04—19;修回日期:2014—05—01.編輯:周麗、張哲.作者簡介:馬文坡(1985一)
8、,男,從事區(qū)域地質(zhì)礦產(chǎn)工作,通信地址遼寧省大連市金州新區(qū)五一路1O號,E—mai