Letlapa le ka sebelisoa marulelong, fatše, lirapeng le libakeng tse ling, empa hape le lejoe le letle le khabisitsoeng, lejoe la tlhaho ke mefuta e sa tšoaneng, letlapa ke eng?Batho ba bangata ha ba tsebe hakaalo ka mofuta ona oa lejoe.Letlapa le bile teng joang?Seke oa tšoenyeha.Ha re bue ka eona.Ha re shebeng.

Letlapa ke eng?

Letlapa ke mofuta oa lejoe la metamorphic le nang le sebopeho sa letlapa 'me ha le na recrystallization.Lejoe la pele ke lejoe la argillaceous, silty kapa neutral tuff, le ka hlobolisoang ka maqephe a masesaane ho latela tsela ea letlapa.E entsoe ka metamorphism e nyane ea letsopa, majoe a sedimentary a silty, majoe a tuffaceous a acid e bohareng le mafika a sedimentary tuffaceous.
Ka lebaka la ho felloa ke metsi 'meleng, ho thatafala ha lejoe la pele hoa matlafatsoa, ​​​​empa motsoako oa liminerale ha e le hantle ha o boele o tsosolose.E na le sebopeho sa metamorphic le sebopeho sa metamorphic, 'me ponahalo ea eona e teteaneng ebile e patehile crystallization.Likaroloana tsa liminerale li ntle haholo, tseo ho leng thata ho li khetholla ka mahlo a hlobotseng.Hangata ho na le palo e nyenyane ea sericite le liminerale tse ling holim'a poleiti, e leng se etsang hore bokaholimo ba poleiti bo be le silika hanyenyane.Letlapa ka kakaretso le ka rehoa ka botlalo ho latela litšila tsa mebala e fapaneng, joalo ka letlapa le letšo la khabone le letlapa le botala bo boputsoa.Ka metamorphism ea boemo bo tlase ba mocheso, majoe a sa tebang a metamorphic a nang le matheba le likarolo tsa lipoleiti a ka thehoa, a atisang ho bitsoa "majoe a mabala".Letlapa le ka sebelisoa e le thepa ea kaho le thepa ea ho khabisa.Mehleng ea boholo-holo, e ne e atisa ho sebelisoa e le lithaele libakeng tse ruileng ka letlapa.

Letlapa le thehile joang?

Letlapa, joalo ka lejoe la lehlabathe, ke lejoe la sedimentary le entsoeng ke motsamao oa crustal oa lefats'e le ho hatelloa le ho tlamahanngoa ha lijo-thollo tsa lehlabathe le samente (silicous matter, calcium carbonate, letsopa, iron oxide, calcium sulfate, joalo-joalo) tlas'a kholo ea nako e telele ea nako e telele. khatello.Hona joale, mebala e meholo ke e putsoa, ​​​​e ntšo, e tala e khanyang, e pinki, e sootho, e bohlooho bo khanyang, e mosehla joalo-joalo.Slate ha e ruile feela ka sebopeho, empa hape e thata, 'mala o motle, ho kenngoa ha metsi a tlaase, ha ho na tšilafalo ea mahlaseli, e nang le matt, anti-skid, acid le alkali ho hanyetsa, mollo le ho hanyetsa serame, ho hanyetsa boemo ba leholimo, ho tsitsa hantle le litšobotsi tse ling.

Sebopeho sa liminerale ke haholo-holo mica, e lateloa ke chlorite, quartz, palo e nyenyane ea pyrite le calcite.Letlapa le lecha le na le lehlabathe le phahameng, calcium le pyrite e ngata, le lithology e thata.'Mele oa ore ke calcareous sericite le silty sericite e nang le botenya bo le bong ba 1-5 cm.
Majwe a sa tebang a metamorphic a thehwa ke metamorphism e nyane ya letsopa, majwe a sedimentary a silty, majwe a tuffaceous acid a mahareng le majwe a sedimentary tuffaceous.Botsho kapa bohlooho-botsho.The lithology e kopane 'me plate cleavage e ntlafalitsoe hantle.Hangata ho na le palo e nyenyane ea sericite le liminerale tse ling holim'a poleiti, e leng se etsang hore bokaholimo ba poleiti bo be le silika hanyenyane.Ho ne ho se na recrystallization e hlakileng.Ka microscopically, lithollo tse ling tsa liminerale, joalo ka quartz, sericite le chlorite, ha li ajoa ka mokhoa o sa tsitsang, empa boholo ba tsona ke liminerale tsa letsopa tsa cryptocrystalline le phofo ea carbonaceous le tšepe.E na le sebopeho se sa sebetseng le sebopeho se matheba.
Majoe a mantlha a nang le sebopeho sa poleiti haholo-holo argillaceous rocks, argillaceous siltstone le intermediate-acid tuff.Letlapa ke sehlahisoa sa boemo bo tlase ba metamorphism ea libaka, 'me mocheso oa eona le khatello e tšoanang ha e phahame, e amehang haholo ke khatello ea maikutlo.Lamellar cleavage metamorphic rocks e nang le likarolo tsa argillaceous le silty e le likarolo tse ka sehloohong le likaroloana tsa argillaceous le silty e le likarolo tse ka sehloohong li ka sebelisoa e le lejoe la mohaho, stele le inkstone.
Ho theosa le lilemo, lintlha tse ngata li pakile hore lejoe la tlhaho le fetohile e 'ngoe ea lisebelisoa tse tummeng ka ho fetisisa tsa fatše.Li na le litšobotsi tse ling tse ka 'nang tsa e-ba teng' me li loketse haholo bakeng sa lisebelisoa tsa mokatong oa kamore ea ho hlapela.Letlapa, joalo ka lejoe la tlhaho, litšoaneleho tsa lona tsa tlhaho li etsa hore e be thepa e nepahetseng ea mokatong oa ho hlapela.