No abstract

DejJarlll1m l rif P/~) ' sical Ceogm!)/~) ', Slockholm L -n i[lersi~)I, S-I0691 Stockholm, Sweden BSTRACT. The e\'oluti o n of ice-shcc t co nfig ura ti o n a nd now p a tt ern in Fe nnosca ndi a th ro ug h th e las t g lac ia l eyclc was reco n s truc tcd using a g lacia l geologica l ilwe rsi o n model, i.c. a th eo reti ca l m od el tha t fo rm a li ses the procedure o f using the la ndfo rm record to reco n struct ice shee ts. Th e m odel uses m a ppcd now traces a nd degla cial meltwa ter la nd forms, as well as rela ti ve chron ologies d e rived fro m c roSS-CUlling stri ae a nd tilllineati o n s, as input d a ta . Fl o w-trace sys te m s w e re cl ass ifi ed into fo ur typ es: (i ) timetra nsg ressi\'e w e t-bed deglac ia l fa ns, (ii ) tim e-tra n sgr essi\'e fi-oze n-bed deglacia l fa n s, ( iii ) surge fa ns, a nd (i\') synchro n o us no n-dcglae ia l (e \'e lll ) fa ns. Us ing re la ti\'c chro n o logies a nd agg rega ti o n o f fa ns into g lac io logiea ll y pl a usible p a ttcrns, a seri es ofi ec-shee t co nfi gura ti ons at difk re nttime sli ces w as e reeled. A c hro n o logy lV as co n struc ted thro ug h co n -ela ti o n w ith d a ted stra ti g ra ph ica l record s a nd prox y d a ta re n ee ti ng g lo ba l ice \ '0 1 u m e. G eological ey ide nee ex ists fo r se \'C ra l di scre tc icc'-sh ee t confi g ura tio ns ce ntred 0 \ '(' 1' th e Sea ndina \'i a n mo ullla in ra nge during th e ea rl y \\'e iehse li a n. Th e build-up of th e m a in \\'e ir hseli a n Fe nn osca ndi a n ice sh ce t sta rt ed a t a pprox im a tel y 70 k a, a nd o ur res u lts indicate tha t it was c h a rac te ri sed b y a n ice shee t with a cc ntre of m ass located O\'e r so uth e rn Norway. Thi s co nfig ura ti o n h a d a n oli' p a tte rn w hi c h is poo rl y re produced b y c urrel1l numeri ca l m o d e ls of th e Fe nn osca ndi a n ice sh ee t. Atth e L as t G lacia l M ax imum t h e m a in ice di\·ide w as loca ted 0\'Cr th e Gu lf ofBOlhni a. A m aj o r bend in th e ice di\·ide was ca u sed by o utn ow o f ice to th e no rth wcs t O\'C r th e lowes t p a rt of the Sca ndin m'ia n m o unt a in c ha in . Wides pread a reas o f preserwd pre-I a te-\\'e ic hscli a n la nd scap es indi cate th a t th e ice shee t h ad a fr oze n-b ed co r e a r ea, whi c h wa s o nl y pa rtl y dimini shed in s izc b y in wa rd-tra n sg ress in" wet-bed zon es during th e decay phase.

No abstract

No abstract