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1、萬方數(shù)據(jù)第35卷第6期中國礦業(yè)大學(xué)學(xué)報V01.35No.62006年11月JournalofChinaUniversityofMining&TechnologyNov.2006文章編號:1000—1964(2006)06—0778—05貴州晚二疊世含煤地層沉積格局及其構(gòu)造控制熊孟輝1’2,秦勇1,易同生h2(1.中國礦業(yè)大學(xué)資源與地球科學(xué)學(xué)院,江蘇徐州221116;2.貴州煤田地質(zhì)局地質(zhì)勘察研究院,貴州安順561000)摘要:貴州省主要含煤地層是上二疊統(tǒng)龍?zhí)督M和長興組,先前研究基本查明了其沉積環(huán)境和區(qū)域構(gòu)造背景.在此基礎(chǔ)上,結(jié)合近年來的勘探成果,進(jìn)一步就區(qū)域構(gòu)造對含煤地層沉積格局的控制作用進(jìn)行
2、了探討.研究表明:晚二疊世期間發(fā)育的同沉積斷裂對含煤地層沉積格局起著區(qū)域性控制作用,形成了“東西分帶、南北分區(qū)”的沉積與聚煤格局.總體來看,以橫貫中部的遵義一惠水NNE向斷裂帶為界,東部地區(qū)海相沉積較為發(fā)育且煤層發(fā)育極差,西部地區(qū)以海陸交互相沉積為主且煤層發(fā)育較好;以盤縣一六盤水NNE向斷裂帶為界,西部主要表現(xiàn)陸源區(qū),而東部為沉積區(qū).在此構(gòu)造背景上,六盤水一甕安斷裂帶將貴州中、西部進(jìn)一步劃分為黔北隆起和黔南坳陷2個一級構(gòu)造單元,2個單元的沉積作用和聚煤特征差異顯著.不同斷裂帶在不同沉積階段沉降活動的差異性,是導(dǎo)致龍?zhí)对缙?、龍?zhí)锻砥凇㈤L興期沉積格局和聚煤特征有所不同的重要原因.關(guān)鍵詞:貴州;晚二
3、疊世;含煤地層;沉積格局;構(gòu)造控制中圖分類號:P618.11文獻(xiàn)標(biāo)識碼:ASedimentaryPatternsandStructuralControlsofLatePermianCoal—BearingStratainGuizhou,ChinaXIONGMeng-huil一,QINYon91,YITong—shen91’2(1.SchoolofResourcesandEarthScience,ChinaUniversityofMining&Technology,Xuzhou,Jiangsu2216,China;2.GeologicalSurveyingInstitute,GuizhouCoa
4、lGeologyBureau,Anshun,Guizhou561000,China)Abstract:Themajorcoal—bearingstratainGuizhou,SouthChina,iscomposedofthelatePer—mianLongtanandChangxingformationswhosesedimentaryenvironmentsandstructuralset—tinghadbeenfoundoutinpreviousresearches.Inthispaper,thecontrolsoftheregionalstructuretothesedimentary
5、patternsofthestratawerediscussed.TheresultsshowthatthestratawasregionallycontrolledbythesynsedimentaryfaultswithinthelatePermian,whichresultedinthesedimentaryandcoal··accumulatingpatternsofthewest··eastzoningandnorth-southsectioninginGuizhou.Ingeneral,takingtheZhunyi—HuishuiNNEfaultzoneasaboundary,t
6、hemarinedepositswithpoorcoalseamwereratherdevelopedintheeastern,andthecontinental—oceanictransitionaIdepositswithbettercoalseamweredominantinthewest—ern.TakingthePanxian-LiupanshuiNNEfaultzoneasaboundary,the1and—sourceareaexis—tedmainlyinthewestern,andsedimentaryareaoccurredintheeastern.Basedonthest
7、ructur—alsetting。thecentralwesterninGuizhouwasfurtherdividedintotWOthefirst-orderstructuralunits,i.e.,thenorthGuizhouupliftandsouthGuizhoudepression,whichweredistinctlydif—ferentinsedimentationandcoal