Ba and Sr mineralization of fossil fish bones from metamorphosed Belqa group sediments, Central Jordan: an integrated methodology

Hani N. Khoury, Svetlana N. Kokh, Ella V. Sokol, Anna Yu Likhacheva, Yurii V. Seryotkin, Elena V. Belogub

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

6 Цитирования (Scopus)

Аннотация

Potentially new Ba–Sr phase with (Ca, Ba, Sr)10-xx[(SO4)3(PO4)3](F, O2−, Cl)2 (1 < x < 2) composition belonging to the apatite supergroup was discovered in a recrystallized low-grade combustion metamorphic rocks of the Belqa Group, Central Jordan. The phase occurs as a fibrous subparallel aggregate and was originated by pseudomorphical replacement of precursor fish bone tissues embedded in biomicritic bituminous calcareous sediments. The mineralized fish bone was primarily composed of biogenic carbonate-fluorapatite. The Ba–Sr phase is monoclinic with space group P21/b, the unit cell parameters a = 18.881(19), b = 7.091(12), c = 8.951(12) Å, β = 119.68(8)o, V = 1041.1(14) Å3, and Z = 4. The empirical formula of the Ba–Sr phase is (Ca5.19Ba2.35Sr1.07Na0.06)Σ8.67[(S3.31P2.63Al0.03Si0.02V0.01)Σ6.00O24](F 1.33O2− 0.58Cl 0.01)Σ2.00. The primary textural heterogeneity of the bone tissues has controlled sharp compositional zonation of the Ba–Sr phase expressed in patchy distribution of Sr, Ba, Ca, P, and S. The newly-formed Ba–Sr phase represents the extreme case of interaction between precursor fossil biogenic carbonate-fluorapatite and associated Ba and Sr depot minerals (barite and celestine). The reaction took place during long-term and low-grade (T = 450–500 °C) combustion metamorphism of the calcareous sediments under dry conditions. The fossil bones were affected by drastic physical and chemical changes that were completed by the formation of a new mineral phase.

Язык оригиналаанглийский
Номер статьи461
ЖурналArabian Journal of Geosciences
Том9
Номер выпуска6
DOI
СостояниеОпубликовано - 1 мая 2016

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