Cov thee subbituminous feem ntau yog cov tub ntxhais hluas geologically, feem ntau yos los ntawm Mesozoic thiab Cenozoic eras (txij li 251 lab xyoo dhau los txog rau tam sim no); txawm li cas los xij, qib ntawm cov thee yog nyob ntawm qhov kub thiab txias thaum lub sij hawm faus ntau tshaj li hnub nyoog.
hnub nyoog pes tsawg sub bituminous thee?
Ntau cov subbituminous thee hauv Tebchaws Meskas yog tsawg 100 lab xyoo.
Yuav ua li cas sub bituminous thee tsim?
Sub bituminous thee yog lignite uas tau raug nce qib ntawm cov organic metamorphismCov metamorphism no tau tsav tawm qee cov pa thiab hydrogen hauv cov thee. Qhov kev poob ntawd ua rau cov pa roj carbon ntau dua (71 txog 77% ntawm cov hmoov tshauv qhuav).
Thaum twg bituminous thee tsim?
Bituminous thee yog tsim nyob rau hauv ntau lub tshav kub thiab siab, thiab yog 100 lab rau 300 lab xyoo. Nws muaj npe tom qab cov nplaum, zoo li cov khoom hu ua bitumen uas tseem muaj nyob hauv cov roj av. Nws muaj txog 45-86% carbon.
qhov twg yog qhov chaw bituminous los ntawm?
Hauv Tebchaws Meskas, Cretaceous bituminous coals tshwm sim hauv Wyoming, Colorado thiab New MexicoHauv Canada, Western Canada Sedimentary Basin ntawm Alberta thiab British Columbia muaj cov tso nyiaj loj ntawm cov thee bituminous. uas tsim nyob rau hauv swamps raws sab hnub poob npoo ntawm Western Sab Hauv Seaway.
