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1、第4O卷第2期煤田地質(zhì)與勘探Vb1.40NO.22012年4月CoALGE010GY&EXPIoR[ONApr.2012文章編號(hào):1001.1986(2012)02-0001—05河南省晚古生代煤系層序地層格架與沉積演化胡斌,一,尚永國,牛永斌,一,宋慧波,一,劉順喜,張璐(1.河南理工大學(xué)資源環(huán)境學(xué)院,河南焦作454000;2.河南省生物遺跡與成礦過程重點(diǎn)實(shí)驗(yàn)室,河南焦作454000)摘要:通過對(duì)露頭及鉆井資料的研究,河南省晚古生代煤系可劃分為1個(gè)一級(jí)層序(308-252Ma);以太原組上部灰?guī)r段底界面為區(qū)域性沉積間斷面,將該一級(jí)層序又
2、分為Ms1和Ms2兩個(gè)二級(jí)層序;進(jìn)而依據(jù)次級(jí)層序界面又細(xì)分為20個(gè)三級(jí)層序。通過對(duì)本區(qū)沉積演化特征的研究表明:本溪組沉積早期,本區(qū)海侵方向?yàn)樽詵|向西進(jìn)行,海侵中心由南向北遷移,而到本溪組沉積晚期,海侵范圍擴(kuò)大,海侵中心部位繼續(xù)北移,海侵方向由NEE向SWW進(jìn)行;自太原組沉積開始,區(qū)內(nèi)海侵逐漸達(dá)到高潮,海域擴(kuò)大;到山西組沉積期,區(qū)內(nèi)大面積海退,海域范圍向東南退縮,經(jīng)歷了濱海一潮坪一瀉湖一下三角洲平原的沉積演化;到下石盒子組至上石盒子組沉積期,海水基本退出華北盆地范圍.致使河南境內(nèi)沉積演化最后經(jīng)歷了從三角洲前緣一下三角洲平原一上三角洲平原沉積
3、的演變過程。研究成果對(duì)分析研究區(qū)晚古生代成煤、古地理、古環(huán)境及聚煤規(guī)律具有參考價(jià)值。關(guān)鍵詞:河南??;晚古生代;層序地層;含煤地層;沉積演化中圖分類號(hào):P618.1l文獻(xiàn)標(biāo)識(shí)碼:ADOI:10.3969~.issn.1001—1986.2012.02.00lSequencestratigraphicframeworkofLatePaleozoiccoalmeasuresandtheirsedimentaryevolutioninHenanprovinceHUBiIll一SHANGYongguolNIUYongbinl一SONGHuibol一
4、LIUShunxilZHANGLu1,,,,,(1.CollegeofResources&Environment,HenanPolytechnicUniversity,Jiaozuo454000,China;2.KeylaboratoryofBiogenicTraces&SedimentaryMineralsofHenanProvince,Jiaozuo454000,China)Abstract:OnthebasisoffieldobservationintheLatePaleozoicoutcropsofHenanProvince,co
5、mbinedwithde—taileddrillinginformation,thesequencestratigraphicframeworkandsedimentaryevolutioncharacteristicsoftheLatePaleozoiccoalmeasuresinHenanProvincewerestudied.TheresultsshowthattheLatePaleozoiccoalmeas—uresinthestudyareacanbedividedintoonefirst—ordersequence(308~2
6、52Ma),andtwosecond-orderse—quences(Msl,Ms2)whicharedividedfromthebottomsurfaceofupperlimestoneunitoftheEarlyPermianTaiyuanFormation,thatistheregionalsedimentarydiscontinuousinterface.Andbasedonthesequenceinterfacecharac—teristics.itcanbefurthersubdividedinto2Othird—orders
7、equences.IntheearlydepositstageofBenxiFormationwithinthestudyarea,thetransgressiondirectionwasfromeasttowest,thetransgressioncentermigratedfromsouthtonorth.InthelaterdepositstageoftheBenxiFormation,thedepositionofthefollowingtransgressionex—panded,andthetransgressioncente
8、rmovedfurthernorthward,thetransgressiondirectionwasfromNEEtoSWW.SincetheearlydepositofTaiyuanFor