GEOL 231Spring 2001) Whatandes2) Both tlabel t3) In theletter 4) Whatsystem 12 – Igneous a09 is the most csite tholeiitic andthe composite diagram belr from the list minor elemems? K ‐ PotasD and Metamorcommon volc calc‐alkalinetional fields thow of a typic to the right. ent is commossium (1 pt) C rphic Petrologanic rock type compositionhat define theal island arc, (2 pts) nly used to dABgy QUIZ 4 e (basalt, andns occur in arcese two types label the tectiscriminate dtholeiiticcalc‐alkalName___desite, or rhyoc systems. Ons of subalkalitonomagmatdifferent magmEine___________Scolite) in islandn the AFM diane magmas. ( ic feature witma series in iA. MWB. VC. FD. TE. B____________c ore _____/ d arcs? (1pt) agram below(1pt) th the appropsland arc Mantle Wedge Volcanic ArcForearc Trench Backarc ____ 40 , priate 5) WhichA Extra CredIsland 6) Name tsubdu7) In the darc syprodu8) The diaages osoliducondih of these tradit – 1) Whatd Basalts or Cthree factors uction of oceadiagram abovystems. Whicuce the least ?agram below of the arc andus curves for btions that woace element st magmatic enFB‐Continentthat control tanic lithospheve, the numbech source is lik? 4 or 5 (2 pshows pressud different agbasaltic crustould lead to dspider diagramnvironment dtal Flood Basathe extent toere as shown ers 1‐5 show kely produce ts) ure‐temperatges of the subt. Based on tirect melting ms is typical oB does the othealts which the gein the figure possible sourthe most maure paths of sbducting lithothese relation of the subdu1) Rate o2) Age o3) Age o4) Extenflow oMelting of tthe arc and/young of arc magmar diagram repeotherms willbelow (3 ptsrce areas for gagma to the asubducting osphere. Alsonships, what cucting slab? (2of Subductionof the Oceanicof the Volcanit to which thof the mantlethe subducted/or the subdus, A or B? Cirpresent? (1 pl be depresse) generating mrc? 2 ; Whicceanic lithosp shown are thcan you say a2 pts) n c Lithospherec Arc e subductione wedge d slab is mostucted lithosphrcle one (1 pt t) OIB‐Oceaned due to magmas in islah is likely to phere for diffhe wet and drbout the e n induces t likely wherehere are t) and ferent ry e 9) In a maoccuradjaceMelti(paragbiotitthe w10) Whatdestro11) What Low a12) CompWhatmafic13) Whichmixtu14) Continprodu“MASwords 15) A longcrystarespoature arc systrs at depths oent figure, exng at 100Km gasite/hornbe (phlogopitewet solidus. t is an exampoyed? Leadinis one possibangle of subdpared to island is a likely exp magma derivh subalkaline ures of both? nental arc areuces this diveSH” process. s) (1 pt) Meltg‐standing coallization or bonsible for thetem, as showf 100 km (A) xplain why thiis promoted lende) while e). These reacle of a destrug edge of theble explanatiouction or oved arcs, basaltplanation for ved from the magma type Calc‐alkalinee notoriously rsity is by theWhat does thting of crust, ntroversy exiy partial melte formation on in the diagrand 200 km (is would happby to the dehmelting at 20ctions put wauctive continee overriding pon for the gaperthickened o and basaltic this? (1 pt) Tmantle wedgis most comme (1 pt) diverse in thee ponding of mhis acronym sAssimilation,ists over wheting of crust. of most felsic ram below (le(B). Referrinpen. (2 pts)hydration me00 km is promater into the mental arc margplate (mostly sps in volcanic cean crust andesite are The thick contge. mon in contineir magma comantle melts stand for? (At Storage, andther granites Why do momagma? (1 peft), melting og to the phaslting of amphmoted by the dmantle whichgin? Andean msediments shactivity alongmuch less cotinental crustnental arcs ‐ompositions. at the base ot least describd Hybridizatio are producest petrologistpt) Fractionalof the mantlese relationshiphibole dehydration mh lowers to mmargin ; andhed off the arcg the Andeanommon volcats acts as a detholeiite, calc One processof the crust, wbe the proceson d largely by ets believe tha crystallizatioe wedge typicps shown in t melting of elting curve t what is beinc) (2 pts) arc? (1 pt) nic products;ensity barrierc‐alkaline, or s that commowhich triggerss in your ownextreme fractat partial melton of mafic ally the to g to even only s the n ional ting is magmcomp16) True oT F ConvoT F UnlcoT F BatT F OveinT F Roc(mT F Thea 17) NamedifferS type: SeA type: Cr 18) On thfelsic mas will only ppositions of mor False abountinental arc polcanics ike gabbroic omprising conholiths are tyer time, contintermediate ccks comprisingmost Cont arce Sierra Nevadtransform boe the dominanent SIAM graedimentary Rrustal Rocks ine illustration magmas migproduce a smmost granites it Continentalplutonic comrocks of mafintinental arc ypically compnental arc plucompositions g continentalcs show stronda batholith foundary) wasnt source matnite types. (2Rocks n an Anorogebelow of a coght be expectmall amount oimply a crustal Arc Plutonicplexes are thc layered intrbatholiths arosite intrusioutonic complelate (the oppl arc batholithng signs of cruformed when an active riftterial that is t2 pts) I type: enic Setting ontinent‐contted to be genf felsic differeal source. c Complexes (e exposed fosrusions, the ce similar to thons of many dexes grade frposite is true)hs rarely showustal input) margin of tht subduction zthought to pa Mafic Rocks M type: Difftinent collisioerated (1 pt).entiate; also, or batholithsssil magma chompositions heir parent mdifferent interom felsic com) w signs of cruhe North Amezone. artially melt a (gabbros andferentiated Mon zone, circle. trace elemen) (3 pts) hambers of cof most plutomagma compormediate to fempositions eaustal melting oerican plate ofnd generate d basalts) Mantle melts e the area in t nt and isotopontinental aronic rocks ositions. elsic rock typrly to more or contaminaff California (each of the fothe crust wheic rc es. ation. now our ere 19) True oT F HT F AT F AT F Tr20) On thovers21) Give tCcecoFe22) The phistor Sourc Empla23) What magm24) What anort25) Descr Crysta Pl com Intrus Matri Geoloor False abouighly alkalineincompatilkaline rock incounterpalkaline magmfeldspathorace elementcomponenhe phase diagaturated sidetwo characteromposed of >enters; Pipe‐lommon; Typienite (carbonresence of diry in the crustce: Deep manacement: Rais the key chmas, carbonatis the “Anorthositic rocks.ribe two diffeal shape: Archmposition: Arsion shapes: Ax: Archean – ogic