Summary
The stoichiometry of pyroxenes {viiiX2+ viY2+ ivZ4+ 2 O6} and garnets {xiiX2+ 3 viY3+ 2 ivZ4+ 3 O12} is re-evaluated by a theoretical crystal-chemical approach that takes into account natural phenomena that do not fit with conventional anhydrous stoichiometric mineralogy: the existence in eclogites of microinclusions of other minerals that may have been exsolved from previous supersilicic or subsilicic UHPM pyroxene or garnet. Different definitions of supersilicic and subsilicic are discussed and the one based on the ability to exsolve SiO2 and leave behind a stoichiometric pyroxene or garnet is recommended for general adoption. The SHAND system (S = Si et al.; H = H; A = Al et al.; N = Na et al.; D = divalents) for projecting multivariate chemical space involving 23 cations and 104 selected natural or potential mineral species on to two essential diagrams (SAND and SHND) is described in full for the first time. Numerous possible chemical exchanges are considered and justified with respect to known mineral phenomena such as cation vacancies, octahedral silicon or protonation. Several new potential end-members are presented, in particular “supersilipyx”, “supersiligar” and “subsiligar”. It is suggested that small quantities of these end-members can be incorporated into UHPM solid-solutions and lead to various exsolution phenomena during eclogite exhumation.
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References
RJ Angel T Gasparik NL Ross LW Finger CT Prewitt RM Hazen (1988) ArticleTitleA silica-rich sodium pyroxene phase with six-coordinated silicon Nature 335 156–158 Occurrence Handle10.1038/335156a0
DR Bell GR Rossman (1992) ArticleTitleWater in Earth’s Mantle: The role of nominally anhydrous minerals Science 255 1391–1397
DR Bell PD Ihinger GR Rossman (1995) ArticleTitleQuantitative analysis of trace OH in garnets and pyroxenes Amer Mineral 80 465–474
GD Bromiley H Keppler C McCammon FA Bromiley SD Jacobsen (2004) ArticleTitleHydrogen solubility and speciation in natural, gem-quality chromian diopside Amer Mineral 89 941–949
F Brunet V Bonneau T Irifune (2006) ArticleTitleComplete solid-solution between Na3Al2(PO4)3 and Mg3Al2(SiO4)3 garnets at high pressure Amer Mineral 91 211–215 Occurrence Handle10.2138/am.2006.2053
MA Carpenter DC Smith (1981) ArticleTitleSolid-solution and cation ordering limits in high temperature sodic pyroxenes from the Nybö eclogite pod, Norway Mineral Magazine 44 37–44
C Chopin (1984) ArticleTitleCoesite and pure pyrope in high grade blueschists of the Western Alps: a first record and some consequences Contrib Mineral Petrol 86 107–118 Occurrence Handle10.1007/BF00381838
Damour AM (1881) Nouvelles analyses sur la jadéite et sur quelques roches sodifères. Annales de Chimie et de Physique, 5e série, T. XXIV: 1–9
L Dobrzhinetskaya HW Green S Wang (1996) ArticleTitleAlpe Arami: A peridotite massif from depths of more than 300 km Science 271 1841–1845
LF Dobrzhinetskaya R Schweinehage H-J Massonne H Green (2002) ArticleTitleSilica precipitates in omphacite from eclogite at Alpe Arami, Switzerland: evidence of deep subduction J Met Geol 230 481–492 Occurrence Handle10.1046/j.1525-1314.2002.00383.x
M Enami B Cong T Yoshida I Kawabe (1995) ArticleTitleA mechanism for Na incorporation into garnet: An example from garnet in orthogneiss from the Su-Lu terrane, eastern China Amer Mineral 80 475–482
AT Fung SE Haggerty (1995) ArticleTitlePetrography and mineral composition of eclogites from the Koidu kimberlite complex, Sierra Leone J Geophys Res B 100 20451–20473 Occurrence Handle10.1029/95JB01573
T Gasparik (1984) ArticleTitleExperimental study of subsolidus phase relations and mixing properties of pyroxene in the system CaO-Al2O3-SiO2 Geochim Cosmochim Acta 48 2537–2545 Occurrence Handle10.1016/0016-7037(84)90304-1
T Gasparik (1988) ArticleTitleThe synthesis of a new pyroxene NaMg0.5Si0.5Si2O6 and garnet near the diopside-jadeite join EOS Transactions American Geophysical Union 69 500
Guilhaumou N, Sautter V, Dumas P (2005) Synchrotron FTIR microanalysis of volatiles in melt inclusions and exsolved particles in ultramafic deep-seated garnets. Chem Geol (in press)
S Hercule J Ingrin (1999) ArticleTitleHydrogen in diopside: Diffusion, kinetics of extraction-incorporation, and solubility Amer Mineral 84 1577–1587
T Irifune T Sekine AE Ringwood WO Hibberson (1986) ArticleTitleThe eclogite-garnetite transformation at high pressure and some geophysical implications EPSL 77 245–256 Occurrence Handle10.1016/0012-821X(86)90165-2
M Janák N Froitzheim B Lupták M Vrabec J Krogh Ravna (2004) ArticleTitleFirst evidence for ultrahigh-pressure metamorphism of eclogites in Pohorje, Slovenia; Tracing deep continental subduction in the Eastern Alps Tectonics 23 TC5014 Occurrence Handle10.1029/2004TC001641
LT Khanukhova VA Zharikov RA Ishbulatov YA Litvin (1976) ArticleTitleExcess silica in solid-solution of high-pressure clinopyroxenes as shown by experimental study of the system CaMgSi2O6-CaAl2SiO6 at 35 kilobars and 1200 °C Trans. (Doklady) USSR Academy Sciences, Earth Science Sections 229 170–172
VA Khvostova (1963) ArticleTitleOn the isomorphism of epidote and orthite Doklady Academy of Sciences U.S.S.R. Earth Sciences Section 141 1307–1309
M Koch-Müller P Dera Y Fei B Reno N Sobolev E Hauri R Wysoczanski (2003) ArticleTitleOH− in synthetic and natural coesite Amer Mineral 88 1436–1445
GA Lager T Armbruster FJ Rotella GR Rossman (1989) ArticleTitleOH substitution in garnets; X-ray and neutron diffraction, infrared, and geometric-modeling studies Amer Mineral 74 840–851
A Lanzirotti (1995) ArticleTitleYttrium zoning in metamorphic garnets Geochim Cosmochim Acta 59 4105–4110 Occurrence Handle10.1016/0016-7037(95)00320-Y
MA Lappin DC Smith (1978) ArticleTitleMantle-equilibrated orthopyroxene eclogite pods from the Basal Gneisses in the Selje District, Western Norway J Petrol 19 530–584
MA Lappin DC Smith (1981) ArticleTitleCarbonate, silicate and fluid relationships in eclogites, Selje District and environs, SW Norway Trans Roy Soc Edinburgh 72 171–193
Leona M, Smith DC, Pinet M, Merli M, Oberti R, Ungaretti L (1993) Siiv = Feiv exchange in natural ugrandite garnets determined by Raman microspectrometry and X-ray structure refinement. EUG VII. Terra Nova 5, Abstract [Suppl] 1: D15: 520
Liou JG, Zhang RY, Ernst WG, Rumble III D, Maruyama S (1998) High pressure minerals from deeply subducted metamorphic rocks. In: Ribbe PL (ed) Ultrahigh-pressure Mineralogy, Physics and Chemistry of the Earth’s Deep Interior. Reviews in Mineralogy 37: 33–138
HK Mao (1971) ArticleTitleThe system jadeite- anorthite at high pressures Carnegie Inst Wash Yearbook 69 163–168
H-J Massonne RD Neuser (2005) ArticleTitleIlmenite exsolution in olivine from the serpentinite body at Zöblitz, Saxonian Erzgebirge – microstructural evidence using EBSD Mineral Magazine 69 119–124 Occurrence Handle10.1180/0026461056920239
ED Mposkos DK Kostopoulos (2001) ArticleTitleDiamond, former coesite and supersilicic garnet in metasedimentary rocks from the Greek Rhodope: a new ultrahigh-pressure metamorphic province established Earth Planetary Sci Letters 192 497–506 Occurrence Handle10.1016/S0012-821X(01)00478-2
R Oberti M Boiocchi DC Smith (2003) ArticleTitleThe new mineral fluoronyböite from Jianchang (Su-Lu, China) and nyböite from Nybö (Nordfjord, Norway): petrological description and crystal-chemical comparison of these two UHPM amphibole end-members Mineralogical Magazine, Journal of Mineralogical Science 64 769–782 Occurrence Handle10.1180/0026461036740133
Y Ogasawara K Fukasawa S Maruyama (2002) ArticleTitleCoesite exsolution from supersilicic titanite in UHP marble form the Kokchetav Massif, northern Kazakhstan Amer Mineral 87 454–461
S Ono A Yasuda (1996) ArticleTitleCompositional change of majoritic garnet in a MORB composition from 7 to 17 GPa and 1400 to 1600 °C Phys Earth Planet Int 96 171–179 Occurrence Handle10.1016/0031-9201(96)03149-4
FZ Page EJ Essene SB Mukasa (2005) ArticleTitleQuartz exsolution in clinoyroxene is not proof of ultrahigh pressures: Evidence from eclogites from the Eastern Blue Ridge, Southern Appalachians, U.S.A Amer Mineral 90 1092–1099 Occurrence Handle10.2138/am.2005.1761
AR Pawley PF McMillan JR Holloway (1993) ArticleTitleHydrogen in stishovite, with implications for mantle water content Science 261 1024–1026
Pyle JM, Spear FS (1998) Trace element distributions in garnet: a road map for following pelite reaction histories. Geol Soc Am 1998 Annual Meeting. Abstract A231
JM Pyle FS Spear (1999) ArticleTitleYttrium zoning in garnet: coupling of major and accessory phases during metamorphic reactions Geological Materials Research 1 1–49
AE Ringwood A Major (1971) ArticleTitleSynthesis of majorite and other high pressure garnets and perovskites EPSL 12 411–418 Occurrence Handle10.1016/0012-821X(71)90026-4
NL Ross GV Gibbs KM Rosso (2003) ArticleTitlePotential docking sites and positions of hydrogen in high-pressure silicates Amer Mineral 88 1452–1459
G Rossi DC Smith L Ungaretti C Domeneghetti (1983) ArticleTitleCrystal-chemistry and cation ordering in the system diopside-jadeite: a detailed study by crystal structure refinement Contrib Mineral Petrol 83 247–258 Occurrence Handle10.1007/BF00371193
GR Rossman (1996) ArticleTitleStudies of OH in nominally anhydrous minerals Phys Chem Minerals 23 299–304 Occurrence Handle10.1007/BF00207777
MW Schmidt S Poli (1998) ArticleTitleExperimentally based water budgets for dehydrating slabs and consequences for arc magma generation EPSL 163 361–379 Occurrence Handle10.1016/S0012-821X(98)00142-3
H Skogby GR Rossman (1989) ArticleTitleOH- in pyroxene: An experimental study of incorporation mechanism and stability Amer Mineral 74 1059–1069
H Skogby DR Bell GR Rossman (1990) ArticleTitleHydroxide in pyroxene: variation in the natural environment Amer Mineral 75 764–774
DC Smith (1971) ArticleTitleA tourmaline-eclogite from Sunnmöre, Norway Norsk Geol Tidds 51 141–147
Smith DC (1976) The geology of the Vartdal Area, Sunnmöre, Norway, and the petrochemistry of the Sunnmöre Eclogite Suite. Ph.D. thesis, Aberdeen University: 1–750
Smith DC (1982a) On the characterisation and credibility of supersilicic, stoichiometric and subsilicic pyroxenes. Third Internat Kimberlite Conf, Terra Cognita 2: 223
Smith DC (1982b) The essence of an eclogite: Alvi, as exemplified by the crystal-chemistry and petrology of high-pressure minerals in Norwegian eclogites. “Convener’s Address”, First Internat Eclogite Conf, Terra Cognita 2: 300
DC Smith (1984) ArticleTitleCoesite in clinopyroxene in the Caledonides Nature 310 641–644 Occurrence Handle10.1038/310641a0
DC Smith (1988) A review of the peculiar mineralogy of the “Norwegian coesite-eclogite province”, with crystal-chemical, petrological, geochemical and geodynamical notes and an extensive bibliography DC Smith (Eds) Eclogites and Eclogite-Facies Rocks, Developments in Petrology 12 Elsevier Amsterdam 524
DC Smith (1989) ArticleTitleThe ABCDE system for rapidly characterizing the n-dimensional chemical composition variations of amphiboles or of other complex mineral groups EUG V, Terra Abstracts 1 293
DC Smith (1995) Microcoesites and microdiamonds in Norway: an overview RG Coleman X Wang (Eds) Ultra-High Pressure Metamorphism (UHPM) Cambridge University Press Cambridge 528
Smith DC (2005a) SiO2 exsolution and precursor supersilicic pyroxene revisited, and a potential new UHPM end-member: “supersilipyx”. Seventh Internat Eclogite Conference, Seggau, Austria. Mitt. Österr Miner Ges 150: 144
Smith DC (2005b) The “SHAND” diagram, a possible subsilicic protonated garnet, and a potential new UHPM end-member: “subsiligar”. Seventh Internat Eclogite Conference, Seggau, Austria. Mitt Österr Miner Ges 150: 145
DC Smith MA Lappin (1989) ArticleTitleCoesite in the Straumen kyanite-eclogite pod, Norway Terra Nova 1 47–56
Smith DC, Cheeney RF (1980) Orientated needles of quartz in clinopyroxene: evidence for exsolution of SiO2 from a non-stoichiometric supersilicic “clinopyroxene”. 26th Internat Geol Congr Paris, Abstracts: 145
DC Smith A Mottana G Rossi (1980) ArticleTitleCrystal-chemistry of a unique jadeite-rich acmite-poor omphacite from the Nybö eclogite pod, Sörpollen, Nordfjord, Norway Lithos 13 227–236 Occurrence Handle10.1016/0024-4937(80)90068-7
Smith DC, Parodi GC, Capitanio F (1996) The Raman spectrum of the Si-poor (Ti,Zr)-rich garnet kimzeyite from Anguillara, Latium, Italy. Congress “GEORAMAN-96”, IMN/ Université Nantes, Terra Nova 8, Abstract [Suppl 2]: 10–11
JR Smyth (1977) ArticleTitlePeraluminous omphacite: cation vacancies in upper mantle pyroxenes. EOS Trans Amer Geophys Union 58 523
JR Smyth (1980) ArticleTitleCation vacancies and the crystal chemistry of breakdown reactions in kimberlitic omphacites Amer Mineral 65 1185–1191
JR Smyth DR Bell G Rossman (1991) ArticleTitleIncorporation of hydroxyl in upper-mantle clinopyroxenes Nature 351 732–735 Occurrence Handle10.1038/351732a0
S Song L Zhang J Chen JG Liou Y Niu (2005) ArticleTitleSodic amphibole exsolutions in garnet from garnet-peridotite, North Quaidam UHPM belt, NW China: Implications for ultradeep origin and hydroxyl defects in mantle garnets Amer Mineral 90 814–820 Occurrence Handle10.2138/am.2005.1684
RN Thompson (1975) ArticleTitleIs upper-mantle phosphorus contained in sodic garnet? EPSL 26 417–424 Occurrence Handle10.1016/0012-821X(75)90017-5
DE Vogel (1966) ArticleTitleNature and chemistry of the formation of clinopyroxene-plagioclase symplectite from omphacite Neues Jahrbuch Miner Mh 6 185–189
BJ Wood CMB Henderson (1978) ArticleTitleCompositions and unit-cell parameters of synthetic non-stoichiometric tschermakitic clinopyroxenes Amer Mineral 63 66–72
H Yang J Konzett (2005) ArticleTitleCrystal chemistry of a high-pressure C2/c clinopyroxene with six-coordinated silicon Amer Mineral 90 1223–1226 Occurrence Handle10.2138/am.2005.1906
J Yang G Godard DC Smith (1998) ArticleTitleThe K-feldspar-bearing coesite pseudomorphs in an eclogite from Lanshantou (Eastern China) European J Mineralogy 10 969–985
P Yang T Rivers S Jackson (1999) ArticleTitleCrystal-chemical and thermal controls on trace-element partitioning between coexisting garnet and biotite in metamorphic rocks from western Labrador The Canadian Mineralogist 37 443–468
A Yasuda T Fujii (1994) ArticleTitleMelting phase relations of an anhydrous mid-ocean ridge basalt from 3 to 20 GPa: Implications for the behaviour of subducted oceanic crust in the mantle J Geophys Res 99 9401–9414 Occurrence Handle10.1029/93JB03205
K Ye B Cong D Ye (2000) ArticleTitleThe possible subduction of continental material to depths greater than 200 km Nature 407 734–736 Occurrence Handle10.1038/35037566
HS Yoder SuffixJr ML Keith (1951) ArticleTitleComplete substitution of aluminium for silicon: the system 3MnO · 3SiO2-3Y2O3 · 5Al2O3 Amer Mineral 36 519–533
L Zhang S Song JG Liou Y Ai X Li (2005) ArticleTitleRelict coesite exsolution in omphacite from Western Tianshan eclogites, China Amer Mineral 90 181–186 Occurrence Handle10.2138/am.2005.1587
RY Zhang SM Zhai YW Fei JG Liou (2003) ArticleTitleTitanium solubility in coexisting garnet and clinopyroxene at very high pressure: the significance of exsolved rutile in garnet EPSL 216 591–601 Occurrence Handle10.1016/S0012-821X(03)00551-X
Y Zhu Y Ogsawara (2002) ArticleTitlePhlogopite and coesite exsolution from supersilicic clinopyroxene International Geology Review 44 831–836
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Smith, D. The SHAND quaternary system for evaluating the supersilicic or subsilicic crystal-chemistry of eclogite minerals, and potential new UHPM pyroxene and garnet end-members. Mineralogy and Petrology 88, 87–122 (2006). https://doi.org/10.1007/s00710-006-0151-7
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DOI: https://doi.org/10.1007/s00710-006-0151-7