内蒙古早二叠世构造古地理的再造.pdf

内蒙古早二叠世构造古地理的再造.pdf

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内蒙古早二叠世构造古地理的再造

10000569/2014/030(07)185866 ActaPetrologicaSinica 岩石学报 内蒙古早二叠世构造古地理的再造 1 2 1 邵济安 唐克东 何国琦 1 2 1 SHAOJiAn,TANGKeDongandHEGuoQi 1北京大学造山带与地壳演化教育部重点实验室,地球与空间科学学院,北京 100871 2沈阳地质矿产研究所,沈阳 110034 1MOEKeyLaboratoryofOrogenicBeltsandCrustalEvolution;SchoolofEarthandSpaceSciences,PekingUniversity,Peking100871,China 2ShenyangInstituteofGeologyandMineralResource,Shenyang110034,China 20131001收稿,20131215改回 ShaoJA,TangKD andHeGQ2014EarlyPermiantectonopalaeogeographicreconstructionofInnerMongolia, ChinaActaPetrologicaSinica,30(7):1858-1866 Abstract  IncontrastoftherecentlypromotedviewofpointthattherewasaPaleoAsianOceanplatesubductingtowardsthe continentsonitsnorthandsouthsidesintheEarlyPermian,thepresentauthorspreferadifferentunderstandingThroughcompilation ofatectonopalaeogeographicmapoftheconcernedareabasedonallthefactsaboutthesedimentarypetrography,palaeogeography, biologicassociation,detritalmaterialsofterrigenousorigin,andhydrocarbonsourcerockintheEarlyPermian,itseemstotheauthors thatwhatexistedbetweentheCentralAsianmassifandtheNorthChinaCratonwasaLatePaleozoicepicontinentalseaandriftinstead ofalargescaleoceanexperiencingspreadingandclosureOurstudiesrevealtheactualevolutionoftheconcernedareaintheEarly PermianIntheearlystage,thesedimentaryprocessaccompanyingstrongeruptionofbasicacidicvolcanicrocksiscontrolledbythree synsedimentaryriftswithnearEWstrike,withthethicknessesofsedimentaryrocksofthelittoralshallowmarinefaciesandvolcanic rocksbeing>8000m,>5000m,and2900mseparatelyfromnorthtosouthTheviewpointofsedimentationbeingcontrolledbydeep faultsissupportedbythedeepgeophysicaldataThesedimentalrocksoftheearlystagearemainlyconsistedofcoarseclasticrocksin whichthegreywackesandarkoseswithlowermaturityaredistributedwidelyBesides,thedenudationareasarecomposedofneogenic continentalcrustsandtheproximalsedimentsarecharacterizedbyquickaccumulation,asseenfromcompositions

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