Gishiri mai ƙanƙara

Gishiri mai ƙanƙara

Glacial buzzsaw wani ra'ayi ne wanda ke da'awar rushewa ta hanyar kankara mai zafi shine mabuɗin iyakance tsawo na duwatsu sama da wasu ƙofar tsawo. Ga wannan ra'ayi ya kara da cewa manyan tsaunuka suna daidaitawa zuwa tsawo na layin daidaitawa (ELA), wanda zai yi aiki a matsayin "matakin yanayi". Farawa daga ra'ayi an yi hasashen cewa yanayin yankin yana ƙuntata matsakaicin tsawo da tsaunuka zasu iya kaiwa ta hanyar tasirin tasowa na dakarun tectonic. Ya biyo bayan cewa kamar yadda yanayin yankin ya fi sanyi a mafi girman latitudes tsaunuka sun fi ƙasa idan aka kwatanta da wurare masu zafi inda glaciation yake kuma ya fi iyakancewa. Hanyar da ke bayan tasirin buzzsaw na kankara zai zama rushewar ƙananan kankara waɗanda galibi ba su iya rushewa sosai a ƙasa da tsawo na layin daidaitawa tunda ba su kai waɗannan tsawo ba saboda karuwar ablation. Maimakon haka, manyan kwarin kankara na iya wucewa cikin sauƙi da tsawo na layin daidaitawa sabili da haka ba sa ba da gudummawa ga tasirin buzzsaw na kankara. An ce wannan lamari ne na filayen kankara na Patagonian inda rashin tasirin buzzsaw ke haifar da saurin tasowa.

Duwatsun da aka ba da shawarar su kasance ƙarƙashin tasirin buzzsaw sun haɗa da duwatsun kudu maso gabashin Alaska, Teton Range na Wyoming da Dauphiné Alps na Faransa. Marubutan kamar Egholm da abokan aiki sun yi iƙirarin cewa tasirin buzzsaw na kankara na iya bayyana tsaunuka a duk faɗin duniya. Wasu daga cikin tsaunuka masu tsawo da ke fuskantar mafi girman hauhawar su ne waɗanda aka watsar da tasirin buzzsaw na glacial.

An soki manufar, kamar yadda auna yawan lalacewar ƙasa a cikin Pyrenees ba ya nuna babban motsi zuwa kowane matakin. A cikin yanayin Norway an ba da shawarar cewa an tsara farfajiyar farfaji ta hanyar tasirin glacial buzzsaw. Koyaya wannan shawarar tana da wuyar sulhunta da gaskiyar cewa farfajiyar paleic ta ƙunshi jerin matakai a matakai daban-daban. Ƙarin cirques na glacial, wanda a cikin ra'ayi na buzzsaw yana ba da gudummawa don yin la'akari da wuri mai faɗi, ba su da alaƙa da kowane matakin paleosurface na saman dutse, kuma ELA na zamani ko Last Glacial Maximum ELA ya dace da kowane matakin da aka ba shi na farfajiyar paleic. filayen da ke da tsawo na Yammacin Greenland ma ba su da alaƙa da wani tasirin buzzsaw.

Bayanan da ke ƙasa

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