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Jeffrey A. Pontius <br />• a fkm <br />_ ~~~ <br />0 r mi <br />N ~~~ .+~. <br />CRESSONI <br />4. ~~T~ <br />~o. <br />STAGE t CRIPPLE CREEK DIATREME <br />.YIrYL aaFLOSne <br />•f YWYA ~'~ •. Ems!-V OLC~M.O <br />pOOVYDwAiP - a% •a OiYlMT! - <br />OnY~NO OI..r11f YAL r \ <br />feVFr10Y °~1- <br />y -L' <br />1' I __~ ~, <br />INITIAL INTRUSIVE 1' I <br />ACTIVITY I00 Ty) ....Y~- <br />FIG.5 <br />LOCATION OF CRESSON ON SUBBASINS <br />ALTERATIONIGEOCHEMISTRV <br />I <br />Tha Criopla Creek voipnic complex has undergone a vanaty of <br />i wall rock al[aabon avant{ whidh are a{soclated wnh Doth ipneoVs <br />activity antl ma minerahzinp avanta. TheN al[arabon [YPet era <br />i • defenDetl below: <br />Arpillixation and Dolomitization are district wide events of weak to <br />i mpdaq[! CI{V alleritldn IpfimanlY 5@ricitel and minor teKETMbnp Dy <br />dolomite. AILerRldn i5 strongest wnnm the dNtramal brecoa units an0 <br />CDUId have 6e@n plated t0 fUmarohC aCbwtV aeSDUated wain me <br />wanYlg SIaQ{5 Of IQnedUS actrvitV Or IESUfblDf tl0mmp. This altlfab00 <br />evaM crna[ed broad xonEa of mcrease0 oermeabdny along major <br />StNCTUrei. <br />Ouanz-Fluorite-Pyrite Veinmp Evan( is volumenicalW minor m overall <br />ditindt extent but rt SipNlatl the bepimm~p of major vein sv5tem <br />devalooment. Thompson 119851 describes the vain oarapenesis in iris <br />mmeraeang seouanee. Wall rack anenhon around these relanvNv <br />narrow vsinf is Ilmita0 t0 a few leer of sencite and secondary K- <br />feiesoar. <br />K-laldapar-Pyrite altanUOn Is widasoreatl IhrdUpnoUt Ne di5tnct <br />primanlV sloop major {truCtural zones. The K•feltlsPar-pVritO alteration <br />IS tnLlmaUW attobdlted with the Nbve QOItl-PVnte mmerahxinp even[ <br />antl it currently tits best exdloration quids [o tracing these deposits. <br />Altaghdn is onmamv m the form of oarvaswe Ndodmb of verv one <br />brained samdine. onhodlasa antl adularu sloop wnh moderate to strong <br />senbibxabdn and Nhadral oynte ranging m sus from verv hoe [o <br />medwm prametl. K-soar-PVnte alteranpn is most prominent m the <br />br0atl vuppy permeable xOnea in th! Upper 1000 leer Of the cpm DlBx <br />Strong K-Soar alOratlpn treater a hardened pprGeliinout rock wMCn <br />can De simnlr m apPearanC! to IdtDlroltl. <br />Oxitlation ono late hytlrOthermal aChvitV occurs m many of NB deposits <br />mrouph out me district won ozldabon ranging m tleoth from 700 to <br />500 leer. Tnis oxitlanan event has developed a variety or iron ono <br />. RANDO[. AT ML~IEXPO '92 <br />STAGE 2 CRIPPLE CREEK DIATREME <br /> ,; <br />1.I ,..I _•~_...Y.~..oLe.Me..Y.. <br />1 <br />. r <br />° <br />; 1 i t ,... <br />~, <br />~ •`~~ <br />WNi1MUEb <br />L <br />~ <br /> <br />;UiRe NAL <br />jl <br />° <br />• ~ <br />sVIEIOEYCE <br />= i~ rAYLn.a <br />• <br />~P~,/RTIONa ENL:RGE <br />A ,~ <br />~ ,' <br />:~ <br />WIPE <br />. ~. <br />• <br />a. ° <br />I <br />L •. <br />i j ~ <br /> <br />' <br />i a~ l,( <br />o..r.T <br />~~ <br />X <br />~ <br />. <br />I IM <br />~: I:, <br />z ' NT..~ <br />l...! <br />7\~., <br />~ ACrIVITV <br />I~~ <br />, <br />4 .n. .~ f ° <br />~AAGMA EVOLVES FROM I'. r °. <br />LURC TO GEL51L ,'t I. - <br />~;,r - <br /> <br />STAGE 3 <br />CRIPPLE CR <br />EEK DIATREME <br />, 17 <br /> <br /> <br />• <br />1 1\ <br />~ ~ •I LTINp <br />N Asti • I. <br />•T`4~~ i ~~ <br />~ <br /> <br />DI.LTPEMAL n. <br /> <br />,I <br />sr <br />' <br />il. <br />, <br /> <br />~~ • ~ - RESURGENT <br />LA rE srA.GE <br />LwMPq OPrrvnE -. <br />~ _ <br />~ ~ALKALiNE <br /> <br />T, <br />•MrPUS~VE CvENr • DOMINO <br />~i <br /> FIG. 6 <br />99E <br />~:-_~~_- <br />