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1、ScienceinChinaSeriesD:EarthSciences©2008SCIENCEINCHINAPRESSSpringerMicrobialcarbonatesinHolocenebeachrocks,Shui-weiling,LuhuitouPeninsula,HainanIsland1,2†1TENGJianBin&SHENJianWei1DepartmentofMarineGeology,SouthChinaSeaInstituteofOceanology;CASKeyLaboratoryof
2、MarginalSeaGeology,SouthChinaSeaInstituteofOceanology,ChineseAcademyofSciences,Guangzhou510301,China;2GraduateUniversityoftheChineseAcademyofSciences,Beijing100049,ChinaTworesearchmethods,geomicrobiologyandcarbonatesedimentology,wereadoptedtostudythemi-crobi
3、alcarbonatesinthebeachrocks,Shuiweiling,Luhuitou,SanyaCity,HainanIsland.TheresultsindicatethatmicrobialcarbonatesoccurinShuiweilingbeachrocksandcementsrelatedtomicrobialactivitivesarecommon.Microbialcarbonatesweremainlydevelopedonthesurfacesofcoralskele-tons
4、andwithinthecoral(fragmentsandshivers)skeletalcavities，andrarelygrewininterspacesformedbycoralandotherbiologicaldetritus.Thegrowthmorphologiesofmicrobialcarbonatesarevarious,includingstromatoliticlamination,thincrusts,dome-like,andmicrobialites.Microbialcarb
5、on-atescommonlytrapfine-sizedbioclasts,containtubularfilaments,andshowlaminatedgrowthstriation.Microbialcarbonateswithinthecoralskeletalcavitiesaregenerallystromatoliticcone-shaped,witharandomgrowthdirectionalongthebearingoftrendofcavities,showingdistinctgro
6、wthlaminaeandrecognizablegrowthphases.Itisaspecialgrowthpatternofcryptmicrobialcarbonates.Microbialcementsoccurmainlyinshapeofneedlecement,calcifiedfilaments,microborings,andcalcifiedframboidalspheres.Theneedlecementisthemostcommontype.Thesemicrobialcementsi
7、ndicatethatmicrobialactivitiesandmicrobialcarbonatesplayedanimportantroleinbeachrockformationinwhichcarbonatesweredominantcomponentsandtheclimateoftropicaloceanmonsoonwasinfluen-tial.Suchmicrobialcarbonatesandmicrobialcementationhavenotbeenreportedherefrombe
8、achrocksalongthenorthernshorelinesoftheSouthChinaSea.Theresultssupportaclearmicrobialoriginforcertaincarbonatecementsinbeachrocks,confirmthatmicrobialcarbonatesareasignificantcontributortocarbon
