▁( western ▁Germany ), ▁and ▁the ▁De cc an ▁Pl ate au ▁and ▁K arn ata ka ▁Pl ate au ▁( s ou thern ▁India ). ▁A ▁proposed ▁mechanism ▁for ▁the ▁formation ▁of ▁the ▁Th aum asia ▁Pl ate au ▁inv okes ▁mant le ▁con ve ction ▁er oding ▁the ▁cr ust al ▁root ▁underlying ▁the ▁province , ▁rapidly ▁indu cing ▁a ▁regional - scale ▁u pl ift . ▁ ▁E ros ional ▁valle ys ▁in ▁the ▁southern ▁marg ins ▁of ▁the ▁Th aum asia ▁Pl ate au ▁are ▁consp ic uous ▁and ▁common , ▁and ▁are ▁often ▁s our ced ▁from ▁deeply ▁disse cted ▁terra ins , ▁vol cano es , ▁or ▁large ▁( 5 0   km + ▁diameter ) ▁impact ▁cr aters ▁( such ▁as ▁Low ell ▁Cr ater ▁and ▁Vo ey kov ▁Cr ater .). ▁Although ▁it ▁is ▁unlikely ▁that ▁precip itation ▁re charg ed ▁the ▁fluid ▁systems ▁that ▁er oded ▁these ▁valle ys , ▁hydro ther mal ▁systems ▁have ▁been ▁invoked ▁as ▁a ▁source . ▁The ▁shock ▁of ▁impact ▁cr ater ing ▁events ▁in ▁water - s atur ated ▁target ▁rock ▁is ▁thought ▁to ▁cause ▁either ▁the ▁cat ast roph ic ▁release ▁of ▁ground water ▁or ▁the ▁induction ▁of ▁a ▁sub sur face ▁hydro ther mal ▁system . ▁Alternatively , ▁this ▁heat ▁may ▁be ▁supplied ▁by ▁mag m atic ▁intr us ions ▁that ▁under lie ▁rif ts , ▁or ▁by ▁mag m atic ▁pip ing ▁supp lying ▁vol can ic ▁surface ▁activity . ▁In tr us ive ▁activity