Formation conditions for triple-chain silicates
-
Bridget E. Ams
and
David M. Jenkins
Abstract
Since the first report of triple-chain silicates in 1977, there has been considerable uncertainty about their formation in nature, primarily concerning whether they are stable minerals or an intermediate step in the formation of other chain or sheet silicate minerals. The lack of thermochemical data and relevant experimental studies for any triple-chain silicate has impeded establishment of their thermodynamic stability relative to other minerals. Here we combine recently reported thermochemical data for a sodium-analog of the triple-chain silicate clinojimthompsonite (Na-cjt) with existing data for various common minerals (i.e., enstatite, talc, anthophyllite, and chrysotile). We also present new experimental data to show that Na-cjt should form stably at typical metamorphic conditions of 0.2 GPa and 450 °C. Ion-activity vs. pH diagrams calculated at 100-300 °C and 0.1 GPa show that Na-cjt could form by reaction between primary igneous minerals (enstatite, forsterite) in oceanic harzburgite and seawater at temperatures up to 300 °C. However, formation of Na-cjt from harzburgite that has been altered to talc and chrysotile is not expected to occur, except at the unusually high pH conditions observed for forearc serpentine mounds. Estimates of the thermochemical properties of the Na-free end-member clinojimthompsonite [Mg10Si12O32(OH)4] suggest that it also should form from the primary mineralogy of harzburgite at temperatures and Si concentrations typically observed for various oceanic hydrothermal and geothermal systems, but probably not from ultramafic rock already hydrated to serpentine.
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Comparative in situ X-ray diffraction study of San Carlos olivine: Influence of water on the 410 km seismic velocity jump in Earth’s mantle
- Visualizing trace element distribution in quartz using cathodoluminescence, electron microprobe, and laser ablation-inductively coupled plasma-mass spectrometry
- Krotite, CaAl2O4, a new refractory mineral from the NWA 1934 meteorite
- Translation interface modulation in NC-pyrrhotites: Direct imaging by TEM and a model toward understanding partially disordered structural states
- Crystal chemistry of Ti-rich fluorophlogopite from Presidente Olegario, Alto Paranaíba igneous province, Brazil
- First-principles study of diffusion and viscosity of anorthite (CaAl2Si2O8) liquid at high pressure
- Aluminous and alkali-deficient tourmaline from the Singhbhum Shear Zone, East Indian shield: Insight for polyphase boron infiltration during regional metamorphism
- Effect of lactate, glycine, and citrate on the kinetics of montmorillonite dissolution
- Acid neutralization by dissolution of alkaline paper mill wastes and implications for treatment of sulfide-mine drainage
- Fast ion conduction character and ionic phase-transition in silver sulfosalts: The case of fettelite [Ag6As2S7][Ag10HgAs2S8]
- Structure of walstromite, BaCa2Si3O9, and its relationship to CaSiO3-walstromite and wollastonite-II
- Cathodoluminescence properties and trace element signature of hydrothermal quartz: A fingerprint of growth dynamics
- Formation conditions for triple-chain silicates
- In situ determination of the spinel–post-spinel transition in Fe3O4 at high pressure and temperature by synchrotron X-ray diffraction
- PVT equation of state of epsilon iron and its densities at inner core conditions
- Pressure-induced structural phase transition of the iron end-member of ringwoodite (g-Fe2SiO4) investigated by X-ray diffraction and Mössbauer spectroscopy
- Non-bridging oxygen and high-coordinated aluminum in metaluminous and peraluminous calcium and potassium aluminosilicate glasses: High-resolution 17O and 27Al MAS NMR results
- The crystal structure of δ-Al(OH)3: Neutron diffraction measurements and ab initio calculations
- Electrical properties of natural and synthetic nano-crystalline MgTiO3 geikielite at mantle pressure and temperature conditions
- Density measurement of liquid FeS at high pressures using synchrotron X-ray absorption
- Cranswickite MgSO4·4H2O, a new mineral from Calingasta, Argentina
- Ambrinoite, (K,NH4)2(As,Sb)8S13·H2O, a new mineral from Upper Susa Valley, Piedmont, Italy: The first natural (K,NH4)-hydrated sulfosalt
- Single-crystal Raman spectroscopy of natural schafarzikite FeSb2O4 from Pernek, Slovak Republic
- Nomenclature of the tourmaline-supergroup minerals
- Quantitative Raman spectroscopy: Challenges, shortfalls, and solutions—Application to calcium silicate glasses
- Icosahedrite, Al63Cu24Fe13, the first natural quasicrystal
- Sulfides from martian and lunar basalts: Comparative chemistry for Ni, Co, Cu, and Se
Articles in the same Issue
- Comparative in situ X-ray diffraction study of San Carlos olivine: Influence of water on the 410 km seismic velocity jump in Earth’s mantle
- Visualizing trace element distribution in quartz using cathodoluminescence, electron microprobe, and laser ablation-inductively coupled plasma-mass spectrometry
- Krotite, CaAl2O4, a new refractory mineral from the NWA 1934 meteorite
- Translation interface modulation in NC-pyrrhotites: Direct imaging by TEM and a model toward understanding partially disordered structural states
- Crystal chemistry of Ti-rich fluorophlogopite from Presidente Olegario, Alto Paranaíba igneous province, Brazil
- First-principles study of diffusion and viscosity of anorthite (CaAl2Si2O8) liquid at high pressure
- Aluminous and alkali-deficient tourmaline from the Singhbhum Shear Zone, East Indian shield: Insight for polyphase boron infiltration during regional metamorphism
- Effect of lactate, glycine, and citrate on the kinetics of montmorillonite dissolution
- Acid neutralization by dissolution of alkaline paper mill wastes and implications for treatment of sulfide-mine drainage
- Fast ion conduction character and ionic phase-transition in silver sulfosalts: The case of fettelite [Ag6As2S7][Ag10HgAs2S8]
- Structure of walstromite, BaCa2Si3O9, and its relationship to CaSiO3-walstromite and wollastonite-II
- Cathodoluminescence properties and trace element signature of hydrothermal quartz: A fingerprint of growth dynamics
- Formation conditions for triple-chain silicates
- In situ determination of the spinel–post-spinel transition in Fe3O4 at high pressure and temperature by synchrotron X-ray diffraction
- PVT equation of state of epsilon iron and its densities at inner core conditions
- Pressure-induced structural phase transition of the iron end-member of ringwoodite (g-Fe2SiO4) investigated by X-ray diffraction and Mössbauer spectroscopy
- Non-bridging oxygen and high-coordinated aluminum in metaluminous and peraluminous calcium and potassium aluminosilicate glasses: High-resolution 17O and 27Al MAS NMR results
- The crystal structure of δ-Al(OH)3: Neutron diffraction measurements and ab initio calculations
- Electrical properties of natural and synthetic nano-crystalline MgTiO3 geikielite at mantle pressure and temperature conditions
- Density measurement of liquid FeS at high pressures using synchrotron X-ray absorption
- Cranswickite MgSO4·4H2O, a new mineral from Calingasta, Argentina
- Ambrinoite, (K,NH4)2(As,Sb)8S13·H2O, a new mineral from Upper Susa Valley, Piedmont, Italy: The first natural (K,NH4)-hydrated sulfosalt
- Single-crystal Raman spectroscopy of natural schafarzikite FeSb2O4 from Pernek, Slovak Republic
- Nomenclature of the tourmaline-supergroup minerals
- Quantitative Raman spectroscopy: Challenges, shortfalls, and solutions—Application to calcium silicate glasses
- Icosahedrite, Al63Cu24Fe13, the first natural quasicrystal
- Sulfides from martian and lunar basalts: Comparative chemistry for Ni, Co, Cu, and Se
