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1、万方数据᤺⌕ᦻmᙢS²⌕Ẇ£U¤。ᙠ¥ᐰ☢ᦈ§¨ᓅᙢ©、ᙢ-ᙢḄªᨵẆ£ᡂdᔜ«ᙢhᧇḄ¬ẠX,®¯°ᙢîì±²、³ᑴᒈ☢e、µᑴↈᱏ、¸ᑁ¹ᑖ᪆d°»t。5¼½æᦪÓ¾¿ÀWUẆ£©-®¯ᙢhÁÂḄÃᓄ®¯¾¿。ðÄ=m²⌕ᡂ:°ᙢ±²ᒈ☢2ᩩ,Å3.5km。½æÆî,Ç᪵ᑴↈᱏ,¹ᑖ᪆tl,¨ÈÉʲ⌕m▮¥ÌÍÎS²,ᐸ*,Ï⚓Î,ᜳᮞÎÓ¹Ô,²⌕ÉÊlSÕÖ-×ØÉÊ;ÙÚS⚓Î、ṺÎRᮞÎÓ¹Ô,²⌕SÕÜ-×Ø-Ý▲Þ⏚àáᙢÉÊ;âãᵫᮞ⁐⚓Î、ṺÎᜳ᯼ç
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4、。ᐵ:ᙢ;-;ÉÊÌ;¨ᱥ;ᦪÓ¾¿I万方数据AbstractLiujiangriverbasinisthemainresearchareaofthisthesis.Fieldinvestigation,sampling,mainsectionofprofilemapdrawing,chipgrindingandinteriormicroscopicanalysisweredoneonthebasiso
5、fcomprehensivecollectionofexistingresearchresultsandallkindsofgeologicaldataofthePaleozoicandMesozoicstratainliujiangriverbasin,northChina.DigitalsimulationsoftwarewasusedtostimulatethegeologicalevolutionofupperPalaeozoicandMesozoicinthestudyarea.Thefollowingmainresultswe
6、reasfollows:Twofieldprofiles(about3.5km)weremeasured.Throughon-siteinvestigation,sampling,chipgrinding,microscopicanalysis,itwasknownthatthesedimentofupperpaleozoicweremainlyterrigenousclasticrocks.Amongthem,thebenxiformationcontainedshaleandlimestonelens,andthemainsedime
7、ntaryenvironmentwastidalflat-lagoon;Taiyuanformationcontainedshale,sandstoneandlimestonelens,andthesedimentaryenvironmentwastidalflat-lagoon-restrictedcarbonateplatformdeposits;Shanxiformationwasconsistedofgrayshale,sandstonewithcoalseam,anditwasmainlydeltadeposits.TheMes
8、ozoicdepositsaremainlycomposedofsandstoneandconglomerate,UpperTriassicXingshikouformationweremainlysandstone,siltstoneandmudstonelayer,andthesedimentaryenvironmentwasmainlymeanderingriverdeposit.LowerHuayuanformationofLowerJuracontainssandstoneconglomerateandcoalseam,andt
9、hesedimentaryenvironmentincludedlakefacies,braidedriversedimentary.Inordertorestorethepaleoenvir