Research output: Contribution to journal › Article › peer-review
Townendite, Na8ZrSi6O18, an Indicator of Extremely High Agpaicity and Important Zirconium Concentrator in Peralkaline Rocks of the Lovozero Pluton, Kola Peninsula. / Pekov, I.V.; Zolotarev, A.A.; Chukanov, N.V.; Yapaskurt, V.O.; Turchkova, A.G.
In: Geology of Ore Deposits, Vol. 66, No. 7, 2024, p. 914-927.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Townendite, Na8ZrSi6O18, an Indicator of Extremely High Agpaicity and Important Zirconium Concentrator in Peralkaline Rocks of the Lovozero Pluton, Kola Peninsula
AU - Pekov, I.V.
AU - Zolotarev, A.A.
AU - Chukanov, N.V.
AU - Yapaskurt, V.O.
AU - Turchkova, A.G.
N1 - Export Date: 01 November 2025; Cited By: 0; Correspondence Address: I.V. Pekov; Moscow State University, Moscow, 119991, Russian Federation; email: igorpekov@mail.ru
PY - 2024
Y1 - 2024
N2 - Abstract: Townendite, ideally Na8ZrSi6O18, earlier considered an extremely rare mineral, was found in abundance in a hyperagpaitic pegmatoid aegirine–nepheline–sodalite–microcline rock with eudialyte, kazakovite, villiaumite, lomonosovite, and alkali sulfides in deep levels at Mt. Karnasurt, Lovozero alkaline pluton, Kola Peninsula, Russia. Townendite forms transparent lilac to light violet segregations up to 6 × 4 cm in size. Its crystal structure was studied based on single-crystal XRD data, R1 = 2.29%. The mineral is trigonal, R‑3m, a = 10.2910(3), c = 13.1577(4) Å, V = 1206.77(7) Å3, and Z = 3. The simplified crystal chemical formula derived from the structure refinement is:. The IR spectrum shows only a trace amount of OH groups. Townendite serves as a protophase for the formation in nature of low-Ca and Mn (Ca + Mn < 0.5 apfu) OH-bearing lovozerite-group zirconosilicates. Two natural evolution series different in a crystal chemical mechanism were found: 1) townendite → kapustinite → litvinskite ; 2) townendite → zolotarevite → litvinskite. The abundance of townendite alteration products in near-surface rocks of the Lovozero complex is indicative of the fact that this mineral is widespread in deep levels of the pluton in “fresh” peralkaline intrusive rocks and pegmatites and is 1) a bright indicator of extremally high agpaicity and 2) an important, occasionally main Zr and Hf concentrator in them. Townendite is major in unaltered rocks of the fifth intrusive phase of the Lovozero pluton, which are protolith rocks of well-known porphyry-like lovozerite lujavrites. © 2025 Elsevier B.V., All rights reserved.
AB - Abstract: Townendite, ideally Na8ZrSi6O18, earlier considered an extremely rare mineral, was found in abundance in a hyperagpaitic pegmatoid aegirine–nepheline–sodalite–microcline rock with eudialyte, kazakovite, villiaumite, lomonosovite, and alkali sulfides in deep levels at Mt. Karnasurt, Lovozero alkaline pluton, Kola Peninsula, Russia. Townendite forms transparent lilac to light violet segregations up to 6 × 4 cm in size. Its crystal structure was studied based on single-crystal XRD data, R1 = 2.29%. The mineral is trigonal, R‑3m, a = 10.2910(3), c = 13.1577(4) Å, V = 1206.77(7) Å3, and Z = 3. The simplified crystal chemical formula derived from the structure refinement is:. The IR spectrum shows only a trace amount of OH groups. Townendite serves as a protophase for the formation in nature of low-Ca and Mn (Ca + Mn < 0.5 apfu) OH-bearing lovozerite-group zirconosilicates. Two natural evolution series different in a crystal chemical mechanism were found: 1) townendite → kapustinite → litvinskite ; 2) townendite → zolotarevite → litvinskite. The abundance of townendite alteration products in near-surface rocks of the Lovozero complex is indicative of the fact that this mineral is widespread in deep levels of the pluton in “fresh” peralkaline intrusive rocks and pegmatites and is 1) a bright indicator of extremally high agpaicity and 2) an important, occasionally main Zr and Hf concentrator in them. Townendite is major in unaltered rocks of the fifth intrusive phase of the Lovozero pluton, which are protolith rocks of well-known porphyry-like lovozerite lujavrites. © 2025 Elsevier B.V., All rights reserved.
KW - and Lovozero alkaline massif
KW - crystal structure
KW - extremally high agpaicity
KW - kapustinite
KW - litvinskite
KW - lovozerite group
KW - peralkaline rock
KW - townendite
KW - zeolite-like silicate with heteropolyhedral framework
KW - zolotarevite
KW - Bioassay
KW - Biogeochemistry
KW - Carbon
KW - Concentration (process)
KW - Feedwater analysis
KW - Granite
KW - Halogen elements
KW - Hydrogen
KW - Iron analysis
KW - Iron ores
KW - Kaolinite
KW - Marble
KW - Mica
KW - Nitrogen
KW - Oxygen
KW - Phosphorus
KW - Steel analysis
KW - Sulfide minerals
KW - Sulfur dioxide
KW - Surface segregation
KW - Thermogravimetric analysis
KW - Weathering
KW - Alkalines
KW - And lovozero alkaline massif
KW - Crystals structures
KW - Extremally high agpaicity
KW - Kapustinite
KW - Litvinskite
KW - Lovozerite group
KW - Peralkaline
KW - Peralkaline rock
KW - Townendite
KW - Zeolite-like silicate with heteropolyhedral framework
KW - Zolotarevite
KW - Alkalinity
KW - mineral
KW - pluton
KW - protolith
KW - zirconium
KW - Kola Peninsula
KW - Lovozero Massif
KW - Murmansk [Russian Federation]
KW - Russian Federation
U2 - 10.1134/S1075701524700168
DO - 10.1134/S1075701524700168
M3 - статья
VL - 66
SP - 914
EP - 927
JO - Geology of Ore Deposits
JF - Geology of Ore Deposits
SN - 1075-7015
IS - 7
ER -
ID: 143368135