Titanium-rich phases in the Earth's transition zone and lower mantle: Evidence from experiments in the system MgO–SiO2–TiO2(±Al2O3) at 10–24 GPa and 1600 °C

Matrosova, Ekaterina A.; Бобров, А. В.; Bindi, Luca; Pushcharovsky, Dmitry Yu.; Irifune, Tetsuo

doi:10.1016/j.lithos.2020.105539

Cited by 9 publications

(14 citation statements)

References 77 publications

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“…with weberite structure in the MgO-SiO 2 -TiO 2 system has been discovered under high pressure and high-temperature conditions similar to the ones found in the Earth's transition zone and lower mantle (Bindi et al, 2017;Matrosova et al, 2020). MgTiSi 2 O 7 weberite has cation occupancy disordering with Mg and Ti ions sharing the A cation sites and Si and Ti occupying the B cation sites (Bindi et al, 2017).…”

Section: Weberitesupporting

confidence: 53%

“…Understanding the energetics of order-disorder transitions induced by other parameters like temperature, radiation damage and pressure in weberite materials are open fields for future studies. Recently, a new oxide of composition MgTiSi 2 O 7 with weberite structure in the MgO-SiO 2 -TiO 2 system has been discovered under high pressure and high-temperature conditions similar to the ones found in the Earth’s transition zone and lower mantle ( Bindi et al, 2017 ; Matrosova et al, 2020 ). MgTiSi 2 O 7 weberite has cation occupancy disordering with Mg and Ti ions sharing the A cation sites and Si and Ti occupying the B cation sites ( Bindi et al, 2017 ).…”

Section: Fluorite-derived Structuresmentioning

confidence: 83%

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A Comparison of Order-Disorder in Several Families of Cubic Oxides

et al. 2021

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Order-disorder on both cation and oxygen sites is a hallmark of fluorite-derived structures, including pyrochlores. Ordering can occur on long- and short-range scales and can result in persistent metastable states. In various cubic oxide systems, different types of disorder are seen. The purpose of this paper is to review and compare the types and energetics of order-disorder phenomena in several families of cubic oxides having pyrochlore, weberite, defect fluorite, perovskite, rocksalt, and spinel structures. The goal is to better understand how structure, composition, and thermodynamic parameters (enthalpy and entropy) determine the feasibility of different competing ordering processes and structures in these diverse systems.

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Section: Weberitesupporting

confidence: 53%

Section: Fluorite-derived Structuresmentioning

confidence: 83%

A Comparison of Order-Disorder in Several Families of Cubic Oxides

et al. 2021

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“…Specifically, the aforementioned low ratios, together with the relatively flat HREE patterns and the moderate Nd radiogenic character of the "primitive" samples (εNd i = +5.1-+6.6), likely point to a (garnet-free) lherzolitic mantle. The relatively low Nb/Nb* values of the most "primitive" tholeiitic samples (Group #1: 0.457-0.701) with respect to mantle values (<1 ppm; Taylor & McLennan, 1985) is also congruent with the presence of Ti-bearing phases both in the upper mantle (e.g., rutile, FeTiO 3 ilmenite, garnet, pyroxene, spinel and post-spinel phases; Matrosova et al, 2021) and underneath (Al, Ca, and Ti oxide and silicate refractory constituents of perovskite; O 'Neill & Palme, 1998;Matrosova et al, 2020), and/or amphibole in the mantle source (Foley et al, 2000). Additionally, if amphibole was present in the source rocks, the E-MORB fingerprints that exhibit the studied tholeiites (Figure 8) might be explained, too.…”

Section: Inferences On the Magma Sourcesmentioning

confidence: 62%

Low–Ti Continental Tholeiite Origin of Magmas With Calc‐Alkaline Signature in Transcurrent Settings: The Mississippian Matachel Volcanic Field (SW Iberian Massif)

Sarrionandia,

Errandonea‐Martin,

Larrondo

et al. 2023

Geochem Geophys Geosyst

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In the Mississippian Matachel small volcanic field of the Ossa‐Morena Zone (southern Iberian Massif) outpoured basic‐intermediate lavas exhibit geochemical characteristics of Low‐Ti continental tholeiites and calc‐alkaline lavas. Low‐Ti continental tholeiites integrate two contrasting groups of rocks: basalts (Mg#: 54 to 70; Ti/Zr: 61–79; LaN/LuN: 1.6–2.9; εNdi: +4.0–+6.6; “Group #1”), and basalts and basaltic andesites (Mg#: 43 to 66; Ti/Zr: 36–58; LaN/LuN: 2.5–5.9; εNdi: −0.2–+3.5; “Group #2”). Primitive Group #1 tholeiitic magmas were generated by partial melting of a garnet‐free lherzolite from an enriched lithospheric mantle, near the lithosphere‐asthenosphere thermal boundary layer (with a very limited asthenosphere melting input). Progressive interaction of these magmas with crustal alkali igneous rocks resulted in the formation of the petrological evolutionary trends observed, to a larger extent in the case of Group #2 Low‐Ti tholeiites. Further assimilation of amphibole‐rich calc‐alkaline metaigneous rocks might have originated the basalts and basaltic andesites with calc‐alkaline signature (Mg#: 33 to 56; Ti/Zr: 25–78; LaN/LuN: 2.0–5.6; εNdi: +2.8–+4.8). These exhibit a “Cordilleran‐type” evolutionary trend, though are unrelated to plate convergence. The magmas with calc‐alkaline signature attest to a closed‐system differentiation process controlled by the fractionation of plagioclase, clinopyroxene, magnetite and ilmenite. It is proposed that Mississippian lithospheric‐scale intra‐continental wrenching, unrelated to coeval mantle plume upwelling, reworked complexly docked mantle domains and triggered mantle melting. Enduring mid‐upper crustal processes (magma storage in mid‐crustal chambers and crustal assimilation) likely shaped the latest petrologic and geochemical aspects of the Matachel Low‐Ti tholeiites and related rocks with calc‐alkaline signature.

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“…Phase equilibria at high P-T demonstrate extensive to complete solid solution for CaTiO 3 -CaSiO 3 ( 28 ), CaTiO 3 -FeTiO 3 ( 29 , 30 ), and FeTiO 3 -MgTiO 3 ( 31 ), is limited for CaSiO 3 -MgSiO 3 along an upper mantle adiabat ( 32 ), but complete at P > 85 GPa in the presence of Fe and Ti ( 33 , 34 ). Single-phase En-Gk is stable at P > 25 GPa, 1600°C ( 35 ). An inevitable consequence of these experimental results is that with decompression and cooling, any high P-T single supersolvus solid solution compound will decompose to two phases that are crystallographically coherent.…”

Section: Discussionmentioning

confidence: 99%

“…This is a possible origin for the type 2 inclusions by decomposition of a mineral precursor, specifically Ca-Ti-Bdm in the system CaO-MgO-TiO 2 -SiO 2 at 20 to 97 GPa and 2000 K ( 33 ) and in the solid solution series MgSiO 3 -MgTiO 3 ( 35 ). In the latter, equilibration at progressively lower P passes through a series of three-phase assemblages that include Bdm, Wds, and structural weberite-type ( 36 ) MgTiSi 2 O 7 (Fig.…”

Section: Discussionmentioning

confidence: 99%

Perovskite-bearing crystal-controlled oxide-silicate mantle xenoliths: Resolution to controversial origins?

Haggerty

2023

Sci. Adv.

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Classic lamellar clinopyroxene-ilmenite intergrowths (type 1) are extended to include discovery of olivine-ilmenite-perovskite-wüstite (type 2) and olivine-spinel-perovskite (type 3) xenoliths in kimberlites from Liberia. Low titanium solubilities in olivine, garnet, and pyroxene cannot account for exsolution-like relations. Because the oxides coexist with high-pressure perovskite-structured silicate minerals in diamond, a permissive conclusion is that type 1 to type 3 xenoliths are of super-deep origin. Phase equilibria and thermodynamic studies show that type 1 xenoliths are stable at P > 80 GPa, with type 2 and type 3 at 35 to 50 GPa consistent with an origin in anomalous large low shear velocity province bodies anchored at the core-mantle boundary. Dissociated precursor perovskite-structured Ca-Fe-Ti bridgmanite is proposed and is indirectly supported by the copresence of type II diamonds with a sublithospheric lower mantle origin.

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Titanium-rich phases in the Earth's transition zone and lower mantle: Evidence from experiments in the system MgO–SiO2–TiO2(±Al2O3) at 10–24 GPa and 1600 °C

Cited by 9 publications

References 77 publications

A Comparison of Order-Disorder in Several Families of Cubic Oxides

A Comparison of Order-Disorder in Several Families of Cubic Oxides

Low–Ti Continental Tholeiite Origin of Magmas With Calc‐Alkaline Signature in Transcurrent Settings: The Mississippian Matachel Volcanic Field (SW Iberian Massif)

Perovskite-bearing crystal-controlled oxide-silicate mantle xenoliths: Resolution to controversial origins?

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