简介：TheMaomingBasinisoneamongstagroupofCretaceous-TertiarybasinsinSouthChina.347sampleswerecollectedfromdrillcoresMRandMBandsectionMS(110°54ˊE,21°45ˊN).MostofthelithologicalunitsareofTertiaryage.ThecoresincludetheLaohuling,Shangun,HuangniulingandYouganwoformations.TheMRcore(874minlength)hasrecordedthepolarityhistoryfromNormalZone18toNormalZone11ontheGeomagneticPolarityTimeScale(GPTS).Thestratawereformedfromabout42Mato32Ma,thatisfromLateEocenetoEarlyOligocene.Ameansedimentationrateofthisstratigraphiccolumnis8.1cm/ka.

简介：TertiarysandstonescollectedfromsouthwestSarawak,Malaysia,wereanalyzedtodeciphertheirprovenance,weathering,andtectonicsetting.Thestudiedsandstoneshaveasublitharenitecompositionandaredominantlycomposedquartzwithlittlemicaandfeldspar,andasmallamountofvolcanicfragments.Thesesandstonesweregenerallyderivedfromquartz-richrecycledorogenicsources.TheyhaverelativelyhighSiO2contentwithlowNa2O,CaO,MnO,andMgOcontents.ValuesofChemicalIndexofAlteration（CIA）oftheserocksamplesvaryfrom71to93,withanaverageof81,implyingintensechemicalalterationduringweathering.AfelsicigneoussourceissuggestedbyalowconcentrationofTiO2comparedtoCIA,enrichmentofLightRareEarthElements,depletionofHeavyRareEarthElements,andnegativeEuanomalies.AfelsicoriginisfurthersupportedbyaEu/Eu*rangeof0.65–0.85andhighTh/Sc,La/Sc,La/Co,andTh/Coratios.ThisworkpresentsthefirstreportedgeochemicaldataofTertiarysandstonesoftheSarawakBasin.Thesedataledustoconcludethatthesandstonesweredislodgedfromrecycledorogenicsourcesanddepositedinaslowlysubsidingriftedbasininapassivecontinentaltectonicsetting.