- T i , ▁low - T i , ▁and ▁very - low - T i . ▁Nevertheless , ▁global ▁ge och em ical ▁maps ▁of ▁tit an ium ▁obtained ▁from ▁the ▁Clement ine ▁mission ▁demonstrate ▁that ▁the ▁lun ar ▁mar ia ▁possess ▁a ▁continu um ▁of ▁tit an ium ▁concentr ations , ▁and ▁that ▁the ▁highest ▁concentr ations ▁are ▁the ▁least ▁abund ant . ▁ ▁L un ar ▁bas al ts ▁show ▁ex otic ▁text ures ▁and ▁min eral ogy , ▁particularly ▁shock ▁met am orphism , ▁lack ▁of ▁the ▁ox id ation ▁typical ▁of ▁terrest rial ▁bas al ts , ▁and ▁a ▁complete ▁lack ▁of ▁hyd r ation . ▁Most ▁of ▁the ▁Moon ' s ▁bas al ts ▁er upt ed ▁between ▁about ▁ 3 ▁and ▁ 3 . 5 ▁billion ▁years ▁ago , ▁but ▁the ▁oldest ▁samples ▁are ▁ 4 . 2 ▁billion ▁years ▁old , ▁and ▁the ▁young est ▁flows , ▁based ▁on ▁the ▁age ▁d ating ▁method ▁of ▁cr ater ▁counting , ▁are ▁estimated ▁to ▁have ▁er upt ed ▁only ▁ 1 . 2 ▁billion ▁years ▁ago . ▁ ▁Bas alt ▁is ▁also ▁a ▁common ▁rock ▁on ▁the ▁surface ▁of ▁Mars , ▁as ▁determined ▁by ▁data ▁sent ▁back ▁from ▁the ▁planet ' s ▁surface , ▁and ▁by ▁Mart ian ▁meteor ites . ▁ ▁Alter ation ▁of ▁bas alt ▁ ▁Met am orphism ▁▁ ▁Bas al ts ▁are ▁important ▁rocks ▁within ▁met am orph ic ▁bel ts , ▁as ▁they ▁can ▁provide ▁vital ▁information ▁on ▁the ▁conditions ▁of ▁met