%0 Journal Article
%T BiomolecularPreservationofMioceneFossilLiquidambarfromTiantai,ChinaandClarkia,USA:ImplicationsforPalaeoenvironmentalStudy
%A XIAO
%A Liang
%A *YANG
%A Hong
%A HE
%A Yuli
%A HE
%A Wenlong
%A LI
%A Xiangchuan
%A GUO
%A Junfeng
%A HUI
%A Kaixuan
%J µØÖÊѧ±¨
%P 1076-1087
%D 2015
%X BiomolecularcharacteristicsoffossilLiquidambarfromtheMioceneShengxianFormation,Tiantai,ZhejiangprovinceineasternChinaandMioceneClarkiasediment,Idaho,U.S.A.,areobtainedbymeansofPyrolysis-Gaschromatography-Massspectrometryanalysis(Py-GC-MS).Theirmodernequivalent(Liquidambarformosana)collectedfromNanjing,easternChina,isalsoanalyzedforcomparison.Thetotalionchromatograms(TIC)ofmodernL.formosanaleavesshowsabundantpyrolysatesoflignin,polysaccharide,aliphaticacid,andaminoacid.However,onlyonepolysaccharidemolecule,i.e.,levoglucosan,isretainedinfossilLiquidambarleavesfromthetwoMiocenesiteswiththeTiantaispecimenpossessinghigherintensity.Asexpected,someligninpyrolysatesincludingbenzene,phenol,guaiacol,vinylphenolandtheirderivatives,aredetectedinMioceneTiantaiL.miosinica.However,thelignincomponentswithlargemolecularweightotherthanbenzeneandphenolcompounds,areabsentinMioceneClarkiaL.pachyphyllum.Abundantpristeneandhomologousseriesofn-alk-1-ene/n-alkanepairswithalongretentiontimeareshowninpyrogramsofbothTiantaiandClarkiafossils.BaseduponourPy-GC-MSdata,themolecularpreservationintheseLiquidambarleafsamplescanberankedasthefollowing(fromhightolowqualityrespectively):modernsample>Tiantaisample>Clarkiasample.Vinylphenol,animportantcompound,ispresentinmodernandTiantaiLiquidambarleaves,whileabsentinClarkiasample,implyingthatvinylphenolmaybesourcedfromligninforLiquidambarleaves.Ourdatasupportthehypothesisofinsitupolymerizationfortheoriginoflong-chainhomologousseriesofn-alk-1-ene/n-alkanepairsasleafalterationproducts.Ourdatahaveimplicationsoftheimpactofleafdegradationtowardbiasesforpalaeoenvironmentalreconstructionusingstablecarbonisotopeoffossilplants,andsuggesttheimportanceofevaluatingmolecularpreservationoffossilleaftissuespriortotheapplicationofcarbonisotopecompositionsoffossilleaves.
%K Liquidambar
%K Py-GC-MS
%K Miocene
%K Biomolecules
%K palaeoenvironment
%U http://www.geojournals.cn/dzxb/ch/reader/view_abstract.aspx?file_no=201504002&flag=1