【doc】微生物碳酸盐岩分类体系的修订：对灰岩成因结构分类体系的补充.doc

微生物碳酸盐岩分类体系的修订：对灰岩成因结构分类体系的补充 14???:5?B 2007??9?( ?L?????C(?M???L?p?N??(?s??);?s???N??) EarthScienceFrontiers(ChinaUniversityofGeosciences,Beijing;PekingUniversity) Vol.14No.5 Sep.2007 ?A?/???B6228;???????B232 (8,65);???Q???g???????????e?????n????????() ???0??????????(65jn),?w,????,?q???????????????L?lt;?????????t???n????L4 ???B???????????7????????????:???????S???????7 ???????????X ??????1,2 11,?s??100083 21(?s??)?L?5?????t?J??????,?s??100083 MeiMingxiang 1,2 11StateKeyLaboratoryofGeologicalProcessesandMineralResources,ChinaUniversityofGeosciences,Beijing100083,China 21SchoolofEarthSciencesandResources,ChinaUniversityofGeosciences,Beijing100083,China MeiMingxiang1Revisedclassificationofmicrobialcarbonates:complementingtheclassificationoflimestones.EarthScience Frontiers,2007,14(5):2222234 Abstract:MicrobialsedimentationwaswidespreadinthePrecambrianandwasalsodevelopedinstromatolitic carbonatehorizonsofthePhanerozoic,whichconstituteonetypeofmicrobialcarbonates.Throughlong2term research,Riding(2000)groupedmicrobialcarbonatesintofourtypes,(1)stromatolite;(2)thrombolite;(3) dendrite;and(4)leiolite.OncoliteiswidespreadinboththePrecambrianandthePhanerozoicanditsparticu2 larlymicroscopicfabricshouldbegroupedunderonecategoryofmicrobialcarbonatesandnotbesimplybere2 gardedasonetypeofsphericalstromatolite.Formicriteswithlaminatedstructures,boththethickerlaminae andtheirsedimentaryenvironmentcomparedtothatofstromatolitesmakesthemasonetypeofmicrobialcar2 bonates.Reefrocksarecarbonatesthatformbybiosedimentation,whichinthe1970sEmbryandKlovenhas subdividedintothreetypes:framestones,bafflestonesandboundstones.Theysubsequentlyaddedanother type,called.cementstones.Theclassificationofreefrocksisacomplementarytotheclassificationoflime2 stones,asproposedbyFolkandDunhaminthe1950sand1960s.Thebasicconceptthatthehighercontentof grainsthehigherenergyofthesedimentaryenvironmentdoesnotfittoreefrocks.Reefrocksweregroupedin2 tothebiologicaltexturalgroupsbyWright(1992);thus,limestonesaresubdividedi