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500 ABS'RACTg WITH PROGRAMS, 1980 • VAC. N671"te:
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<br />EFFECTS OF COMPOSIi[ONAL VARIATION ON 111E CRYSiA1 STRUCTURES OP FIYE-
<br />AND 9EVEN-REPEAT PY 0.0XENOI05
<br />PlNCYVEY, llnda R., and gURV11AM, CTarlea V., Dept. of Leologlcal
<br />Scl cotes, Na rvard Unlvera icy. Cambridge. Mass. 021]8
<br />The et (<c [a o[ cowoafUon, par[l cularly Mn-Mg subs ctcu[1 on, on [h<
<br />c ryscal rtruc taro o! pyromangl[< (pym) and rhodonlce (rho) have been
<br />examined, us tog p«viom retlnemen [s m( [M1e [vo at rut tutu o veil as
<br />nest data on • nearly Dure Mn-Pym Irani Aj tro Mine, Japan. A number o[
<br />system tic relaclonfhlps concerning u[ion orde clog end fu a[cuccural
<br />caneeq ue etas have been dellnea eed.
<br />Although ecrang site pre(ecenc ea eaLS t, there Ss no bus taml te-31 ke
<br />•tepwlee ordering oL ca clans. [n pym, as the Mn:Mg ratio lncreuef,
<br />X6 end M] ae nd more [ow erd 1-coordlnaclon, vhereu M6 tends more [ward
<br />5-coo rd Lnatlon. The [e[raSedral chain Ia most dls totted In [he middle
<br />o! [he aolu[1 On series. The crystal ecructu[es of pym and rho are
<br />closely re leted and ca[IOn substtcuclon has atmilar eLl ec cs on both.
<br />Other results Lnclude:
<br />U Calculated laC[ICe strain elLipsolds show chat [he detection of
<br />g tea ces[ exp anslan with the addi[f on of Mn dlf(e [s !n lw-tin and hlgh-
<br />Mn compos S[1 ons.
<br />11) The pyroxe Wald chain con([ Bata cl on fn [he o[feer region Is found
<br />to depend solely on bulk cow os![1 On (along the MnSID7 - XgS107 loin)
<br />and is independent of [ecrahed rat repeat number.
<br />ill) Res alts of eLe ce ros tacit enetgY uLcu lotions find lc ace thst the
<br />scruc[ure a ergles Of toe xlscing pym and rho o[ slnilar cow os Scion
<br />(OLash1 acdnFinge r, 19;5) are vl rtual L, fide nt SCaL
<br />Finally, we cu;gut [hat the appuen[ Li mlt of 1/1 mole percent Ca
<br />In natural pm may b+ due tv a maximum occupancy v( 50: Ca Sn each o[
<br />y:6 and 81 due tv [et rahedrai chain c nside ra[LOns. A DLS zt utly is
<br />prasently under v y to explore [his hyp othesls.
<br />C EA 020IC FT.OL' PACrE0.N5 OF TXE LGLF BTREAY OsER iXE aLAKE PLA2 EA0
<br />P LNEi, P.R., V.S. Leologlul Survey and Colgate Unlveralcy,
<br />Xemll[on, Nev Tark 17746; POPENOE, Peter, U•S. Leolog SCal
<br />Su ^.ey, L'ovda Xole, Y.a szachus<[cs 0754]
<br />A ey ncheals of aelsmtc s[raclgraphy and JOIO E9 drill data Lcom [he
<br />Blake Plateau has documented mayor changes 1n [he poal[lov end claw
<br />con!lguu[lon of the Lul[ Scream throughout [he Cenoao Lc. Slgnlflu nt
<br />Lul[ Stream interactton with the Blake Plateau began during late
<br />Paleocene [Sine, vhen Incense bottom ac out excavated • 100-km-w lde mane
<br />o[ rugged channeled tppogrspny Into Pa Leoc ene a[caca In an •raa of [Ae
<br />noc[he rv slake Pla[<au now covered by Floclda-Matte raa Slope deport u.
<br />During [he early Eocene, the Cul[ Stream as is shitted 300 ke [o [Fe
<br />couch, cuctf ng channels ac rose the central slake Plateau. Although
<br />boc[mm-current velactclu apDa rencly v eed, [M1e Lul[ Stream [loved
<br />peon late oily nos heaa[va rd ac roes the central plrteau avuch m! lax
<br />]I N. for [he yes[ o[ the Paleogene, eat apt during eM1< lace Oligocene
<br />vhen [he Curren[ may hove obit eed [archer aou[h and umed • more
<br />as «rLy cvurae ac race the muthern Blake Plateau. Since the early
<br />Xtocene, the arrant •als generally has occupted evo mad Ian
<br />pmslc loin: no rch uscerly claw path a a the cent nl Ele ke Plateau
<br />end a more norche rly course along [he loner Blake Places u. Shl[ta Iv
<br />[he past[fov o[ the Gu I( Scream eats appear [o repreae nc a dynamic
<br />response of [he Curren[ ayacem to bv[wm [opo8 v phy and global
<br />sea-level oat lllaclov. During per Coda of sea-level Lovering, the
<br />Lu IL Scream v a de [lac Led progress SVely more [o the east and swath by
<br />a prominen[ abathyme cr LC and scruccural bulge oL the northern Blake
<br />Plateau, [he Chu lert on Bump.
<br />SL'9510ENCE RE9ULTIVG FROM SOLVTION XININL: TECNVIQVES FOR DETECTION OF
<br />SOBS IOENCE AhD RESEUCN IN20 THE MECHANICS OF CMTERING
<br />PIPER, Thomas B., Chalnan - Subcm®ltcee on SuSsid nice end Cracer-
<br />ing, Salu[lon Xining Research Ins ilea ce, Inc., gl3 Muriel Sc.,
<br />Vood scot k, IL 60099•
<br />•egr Subsurface sec hn0logy, BASF Vyand oc[e Corp, Vyand acre MI 48193
<br />9olu[lon Mlntn¢ end 9ubsld once Removal of colt by dissolving alters
<br />the stress state In the recta In ing sale and in she m erl ying rocks.
<br />These materials respond by de(lec c3ng v3thtn narrovv[ens Ile Sim ice or
<br />breaking and falling Soto the cavity, a ec ha ntsn referred [o as scop-
<br />ing. Oe(lecc ions translated [o [he earth's surface are expressed as
<br />dovnwa rping subsldenc e, usually bas ln-sha0ed. Stoping results 1n [o[-
<br />matlon o[ a cra«r vhen seq uentlal breaking o[ rock layers encounters
<br />u onsolldu ed sur (ace mac erlals or daylfght.
<br />nc Detecefon Methods Basins o[ dovvva rping subsidence can be detected
<br />by prat tse lava Lln6 pf m ,. en cs [o mca su re the verclcal compon<ncs of
<br />d tsplacenenc and by mca su tenant a( elan gallon of slope distance and
<br />cr Langulu ton me[hoLS co measure hot L-onul dlsplacemen[, pa rtlcu la rly
<br />In periphery or hta9e arms. Non-access methods ere ass lla ble but cost
<br />1 lmit ing. Precise level ing is most cos o-e(fect lve for 6en<cat use.
<br />Subsidence pose ar:h Tne <olu[fon M(n ing Research [n st (tote (9XRU
<br />Is a not-far-prol tc technlcaL a sac Lac ton o[ eompanles in to ce sled In
<br />solac ion mining. The Insr l[ur<shas sponsored cite review stud Ses of
<br />areas ehe re era uring has cs'xm place and In[v [heoretlcal cone ep [s o!
<br />subslJe nee based on rock nechanlca technology. Currently and away ere
<br />DroJcas at Hurchln son, KS In vh lch 5981 and ene VS Bureau of Mines
<br />arc coo Peru Ing on ces[ dr L'ling and ac ou st LC man [taring In [he area
<br />of recent craters; a project at Un lv IL provldca [or Loves tlgacLOn 1n-
<br />eo an a![crwttve <r3 taring theory lnvo lr ing 1nC UC[!on of a shallow
<br />granular layer, and a raa nual Ss being prepared on su rveying methods [or
<br />su bsld ence detection sad Jata presenm[lon. do append lx Ilse SMRI
<br />p raj ecca end reports.
<br />a
<br />J~Qg~~S~Kts.r~I~ III III IIIIIIIIIIIII'
<br />OCEAXOGAAPXIC AHD ATMOSPHE SPpHSE OF ivc nu 999 .R.
<br />ac Xlfq-
<br />TD YAR IATIONS LY GLOBAL CLIMATE DUAING THE LAST 500000 [EARS }~
<br />PISIAS, x.4., MOORE, T,C. .J r., BOOEN, G., Graduate School of Oceu"'i
<br />og raDhy Unive rsf Cy of Rhode Island Kingston RI 02881, AOBERTSga
<br />J., Chevron Oil Res earth Le Habra California
<br />Deep-sea sediments provide a mul ticnannel record of the response of .
<br />oceenog raphic and atmospheric processes to global climate chang¢, Fpst•1~
<br />remains of marine Dl ank [on record su r(ace wd ter mass cha roc [erls tics, ,,y
<br />opaline silica accumulation reflect surface products vlty, and col inn ,.,;,r
<br />quart[ Drovides n record of etmosDher(c trans Dort of sediment to the .: w.':
<br />dee0 sea. Oe [ailed time series of these oceanogra phic and aCnosphe rlc ~"'=
<br />indicators in a deep-sea se0i meet tore Ca ken 1n the Np r[hwest Pac iflc ~~
<br />Ocean finable us to detemine the tine tlependent response of the ocean- ";
<br />a wasphere system to changing Clime:e Ovtr the last 500,000 years. Tim.;
<br />control is prT Vioed by radiolarian biostra fig raphic da toms and by tar-; _.
<br />ietions in the radiolarian T. davisiena. Oceanographic and atmosDherlt'F:
<br />indita [ors include a measure o the varia[id~s in [he Co (al radio lark";"
<br />fd one, is timd ces 0( sad surface temperatures, and d[[umUlaN On rd ttS D/.}'
<br />opaline silica and quarL•. Cross-spec [rat analysis was used to dear-
<br />mine [nP co fr<1a C100 (Cphe renty) 0f these OC <d0-d UIID$Dht re pdramtLlR '::~
<br />to [he Earth's orbital Da rame[ers. Tne ac eano9 raphic indita COrs Sha s ',
<br />s troy coherence Nith variations in [he Earth's tilt. The quartz da4
<br />snow no relaNnship wi to tilt, but shays significant coherence wiN
<br />gr¢Ctil ion dnG tCS S<COnd hn RnOnl< lndl<a Ci ng LhdC vaT1dL1005 On d [t4
<br />sonal scale are important controls o' quartz accumulatior. whereas W^1
<br />annual Ins ola:itn more greatly of /e:a [ne oceanographic indita CO rs.
<br />Tne acdlysis also indita [es the imp9r:ence of a non-lines- response [q
<br />varia:IOns of ;il[ and Crec ession w. ice produ;es a 15,000 year pe ri odic
<br /><tmpOnen[ in :02 Nor Chw es: Pacific U1d sec. Cross-spat [rat dndlyilf
<br />usi r,g only the sediment ca to secs icclce [e the! in the Nr'nvest peci-
<br />fm ccsl ac~~r,l2 ciao is reduced du r:ng times o! large S1:Sa1 ice-
<br />volu-e. ibis is unlike the rpla [Toot lps o0se rued in the nrtheast eM
<br />eaz c2 -n aqua ton al Paci ll :.
<br />GEOC~E°ICAL PAq"ITION INL OF DEEP-S E:: $EOIXEN T$ US IXG AN ErTENOEO YEDSIp
<br />OF Q-RJDE FACTC; ANALTSIS AND LINEA2 7RDGRAMHING
<br />P:G i~b, Nicilas G, one LEINEN, Me ;are[ S., Graduate $tgpol of
<br />Oceanography University of Anode Island, Ki ngs [on RI 02881
<br />Deep-sea sedimen [s are an lmpor un[ component of the geornrni cal qdt
<br />of many mayor aid minor ¢lements. Ho-ever, the fine-grain si le of Nose
<br />sedir. en [s and [nest cnemlcal al tera:ipn on the seaf loot generally pre.
<br />clutles direct [a [e retina tl on of the copposi [ion and relative inporuan
<br />D( VLr10uF source material. Several s:udres a! deep-sea se:imenti ban '
<br />used bulk chemi5 cry to determine quLC;i to Lively the con tritu Lion of <1-
<br />em<n [S from vd rl our sad LneDC SOUrCee. Tease Studies have 6phdsiled tv-
<br />ma[iw [atom quzs Nhicn assume [hat the sources of elemec[s are lid Led
<br />and coat the corposition of Ne end-.:.znber sou rtes is toes :ant and us
<br />be cna ra<[eritLd. Typical end-members ere 5edi rent of terrigenous, bla-
<br />genous, hydro Cntrmal, and au[higeni Unydrogenous origin. Se^. since[ tem-
<br />ples can be parts Cloned into the con -r ibu Cion /tom each source 1( the
<br />chemical composition of each source n known or determine'. Two ap-'
<br />proachzs have b=_n used, analysis o! presumed end-members and infer<ICe
<br />f rOm mul [ivaria:e (actor cna lysl5 of da [a Sets which are presumed W Se
<br />in(Icenced by all important 5ed amen: route e5. Fac tar analysis Is uso21-
<br />ly no: used [o Determine the actual <onposf Non of [he enC-member smK-
<br />es because various [ra ns(onna ti ons arc made on the original element di7
<br />and the factor scores and -composition" o! the or Choganal end-members
<br />often con tale nxga Live con :ribu Ci ons p! some elements - a Sealo9lcelly
<br />unreasD noble cccdi Cion. RO Ca Cion ich ces to obtain Wore geglpgically
<br />reasonaSle end-,-.embers often result in large negative cot :ri bu [ions of '
<br />end-r. r.:o ors in s,:me samples and require the assumption that [rue erd-
<br />member composi ;ions are represented by single samples. Nitn the old a(.
<br />an ea :ended version of Q-mode factor anelys is a strategy can De derel- ;
<br />ppeL vnich objectively tlo [eons Wes [he composition of end-r. zrber sourt3
<br />and se :i5f ies JO:h [he <OnOl icon tha; the e1 er..<n :dl composi :(on D( tM
<br />end-mcSers are all positive and the: the cpntri bu ti on o! these er-0-
<br />members in each sample are, in general, positive as well.
<br />CHEMIC:C ANO 19CJOPIC CO"?OSITIOHS CE THE BV gOXJ ORE-FOP_'C VL FLUIDS
<br />PIS'.-.HA-AR':0<J, Y. ant 0X8020. H., Jepa r[ma r.: o[ Leosc:ncea. tha
<br />nsylva-:a Sure Cnlvers Sty, lnlven ltv Park, PA 16302. '
<br />Flu [d fee lassoes Sn 10 sa=pies o[ su'f Ides and quarts trop 5 Ru roam dr
<br />pasta were ea: ratted in ru uo, and c'-Cr Isot oplc compoz::'om, mrls~
<br />and dissolved gases v re decermined. 1e Isotopic and chem:cal compwl '
<br />[tons a exc ra:red fluids show vtde va: ESC ion (e. g., dD•-5 :0-50%.t -
<br />Na • O.l.ro 0.] -), re(lec ang varied ;:apo re Sons oL prim ry' and secemd-
<br />ary lv:Lv sloe s, concamina::on Lrom m-rote soli: Dha se s, ac! ocher a;+r
<br />Imen u' prob lees. Move ve c, the prim ay Lluld ucSus to ns +':ear Da i.t
<br />Fa lrlr narrow ranges In me composi[ :: as: 60 •-I 5:10%..; g.!p-Lgg•O.y
<br />xa•o. 5: .2 m •D.olm.ol m; ca •o.c::.D2 .: y;•D.ol:.oD>=:
<br />e. 10 _~ and sa vq~- ].9:45 vt. Z. T-e raises y~ values arc to good
<br />a tee _e-.t vlt hr: obca:ned from L-re: in to-pe taco re meal=r meau d
<br />flu ld °s Sus -~aTem era ra yes esrira:e! loom Na-A-Ca goo e.<rmome srT m
<br />200 to-7 i0'L,os -.:chegene rally s ::b [nose esttm Led b': other gar -
<br />chem[u: necbe2t. The pN values aofe[`e Ku rokv c:e fluids, ulculatd
<br />from mien ene-'.sv r, CJp content, ,-! the ass:: wad alce:a: I°" army
<br />bia gas (t.e., se: is ire a quartz , hlg-:'rlorlu - ulc ice), ve a.5
<br />for tee .•n[ire :r.peru u:v ranee a( a -eta lirar is n. TM1e is::o)lee( .
<br />clmml; a: compos :: :e ns oL ehe Auroko L:~a ds are similar to ['nose 4',
<br />Ilu WS :n exper nenml sea~.acer-rhYO:::a and se rvacer-dau :< sY SCe+a
<br />2.70^-0i0°C ar: low warLr!roek ra[i:a. This suppacts the :+e PrT tear
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<br />I~^~ N Ir n n I III Ili ri rln U 911' ' ~~'I iI~ ~ ill ~ rI ~ ~ ~ III
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