The importance of geochemical data for geodynamic reconstruction: formation of the Olkhon metamorphic complex, Lake Baikal, Russia

Makrygina, V. A.; Petrova, Z. I.

doi:10.1016/s0024-4937(98)00010-3

Cited by 18 publications

(8 citation statements)

References 11 publications

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“…Simplified geological map of the Olkhon Terrane (modified after Fedorovsky et al, 2020). Previous metamorphic P – T estimates are indicated (1‐Sklyarov, Lavrenchuk, Fedorovsky, Gladkochub, et al, 2020; 2‐Li et al, 2009; 3‐Gladkochub, Donskaya, Wingate, et al, 2008; and 4‐Makrygina & Petrova, 1998). …”

Section: Geological Settingmentioning

confidence: 95%

“…Previous estimates of the metamorphic conditions in this zone are relatively few owing to the limited presence of mineral assemblages suitable for thermobarometric calculations. Metapelites studied by Makrygina and Petrova (1998) using garnetbiotite thermometry and garnet-aluminosilicateplagioclase barometry revealed peak conditions of approximately 0.60-0.80 GPa and 630-710 C, with higher temperatures (up to 790 C) recorded adjacent to the granite gneiss dome. Li et al (2009) studied the P-T conditions of a garnet-biotite gneiss using garnetbiotite thermometry and garnet-biotite-plagioclasequartz barometry and estimated peak conditions of 770-790 C/0.72-0.74 GPa and retrograde conditions of 710-766 C/0.48-0.52 GPa.…”

Section: Metamorphism and Metamorphic Fabricmentioning

confidence: 99%

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Metamorphic and chronological constraints on the early Paleozoic tectono‐thermal evolution of the Olkhon Terrane, southern Siberia

Jiang

Collett

et al. 2023

Journal Metamorphic Geology

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Terranes accreted to the southeastern margin of the Siberian Craton record an important early Paleozoic tectono-thermal event (known as the Baikal orogenic cycle) in the evolution of the Central Asian Orogenic Belt (CAOB). However, the precise metamorphic conditions and relative timing of this event and its linkage to the wider CAOB remain far poorly constrained. The best exposed of these terranes is the Olkhon Terrane on the western bank of Lake Baikal.Here, late Neoproterozoic through early Paleozoic island arc and back-arc assemblages were metamorphosed to form a thin granulite facies belt cropping out adjacent to the Siberian Craton and lower temperature/pressure paragneiss and migmatite towards the southeast. Phase equilibria modelling suggests that the granulite facies belt preserved moderate pressure (c. 0.80 GPa) and high temperature (up to 900 C) conditions while the paragneiss and migmatites in the southeast have peak metamorphic conditions around 700-770 C at 0.60-0.80 GPa. New geochronological data (zircon U-Pb in granulite and monazite U-Pb in paragneiss/migmatite) in combination with phase equilibria modelling and petro-structural analysis suggest that the tectono-metamorphic evolution of the Olkhon Terrane was controlled by a long-lasting (535-450 Ma) and pervasive thermal anomaly. Discrete maxima in the zircon and monazite U-Pb ages at c. 535, 500, and 450 Ma are linked to different stages of a semi-continuous high-temperature metamorphic evolution. Based on existing geological data of the region, a generalized geodynamic model for the Baikal orogenic cycle involving switching between compressional and extensional regimes during the early Paleozoic accretion of 'exotic' CAOB-derived material to the southern margin of Siberia is proposed. The tectono-metamorphic evolution of the Olkhon Terrane may represent a worldclass example of polyphase shortening of a long-lived hot intra-continental arc-back-arc system during its collision with cratonic blocks.

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Section: Geological Settingmentioning

confidence: 95%

Section: Metamorphism and Metamorphic Fabricmentioning

confidence: 99%

Metamorphic and chronological constraints on the early Paleozoic tectono‐thermal evolution of the Olkhon Terrane, southern Siberia

Jiang

Collett

et al. 2023

Journal Metamorphic Geology

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“…One of the candidates for the source for the Bana FeO*-Al 2 O 3 -TiO 2 -rich rocks is deepseated high-Ti "metalaterite". Such metalaterite has been reported from South Africa by Beukes et al (2002) and from Russia by Makrygina and Petrova (1998) and from Japan ( Iwao, 1978;Nishio et al , 2003 ). Genetically, it is thought that high rates of heat derived from the rising upper mantle responsible for the lithospheric thinning (extension) and subsequent partial melting facilitated the fusion of the crustal refractory target source.…”

Section: Genesis Of the Bana Feo*-al 2 O 3 -Tio 2 -Rich Rocksmentioning

confidence: 93%

FeO*‐Al₂O₃‐TiO₂‐Rich Rocks of the Tertiary Bana Igneous Complex, West Cameroon

et al. 2009

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FeO*-Al 2 O 3 -TiO 2 -rich rocks are found associated with transitional tholeiitic lava fl ows in the Tertiary Bana plutono-volcanic complex in the continental sector of the Cameroon Line. These peculiar rocks consist principally of iron-titanium oxides, aluminosilicates and phosphates, and occur as layers 1 -3 m thick occupying the upper part of lava fl ows on the southwest (site 1) and northwest (site 2) sites of the complex. Mineral constituents of the rocks include magnetite, ilmenite, hematite, rutile, corundum, andalusite, sillimanite, cordierite, quartz, plagioclase, alkali feldspar, apatite, Fe-Mn phosphate, Al phosphate, micas and fi ne mixtures of sericite and silica. Texturally and compositionally, the rocks can be subdivided into globular type, banded type, and Al-rich fi ne-gained massive type. The fi rst two types consist of dark globule or band enriched in Fe-Ti oxides and apatite and lighter colored groundmass or bands enriched in aluminosilicates and quartz, respectively. The occurrence of andalusite and sillimanite and the compositional relations of magnetite and ilmenite in the FeO*-Al 2 O 3 -TiO 2 -rich rocks suggest temperatures of crystallization in a range of 690 -830°C at low pressures. The Bana FeO*-Al 2 O 3 -TiO 2 -rich rocks are characterized by low concentrations of SiO 2 (25 -54.2 wt%), Na 2 O + K 2 O (0 -1%), CaO (0 -2%) and MgO (0 -0.5%), and high concentrations of FeO* (total iron as FeO, 20 -42%), Al 2 O 3 (20 -42%), TiO 2 (3 -9.2%), and P 2 O 5 (0.26 -1.30%). TiO 2 is positively correlated with Al 2 O 3 and inversely correlated with FeO*. The bulk rock compositions cannot be derived from the associated basaltic magma by crystal fractionation or by partial melting of the mantle or lower crustal materials. In ternary diagrams of (Al 2 O 3 )−(CaO + Na 2 O + K 2 O)−(FeO* + MnO + MgO) and (SiO 2 )−(FeO*)−(Al 2 O 3 ), the compositional fi eld of the rocks is close to that of laterite and is distinct from the common volcanic rocks, suggesting that the rocks are derived from lateritic materials by recrystallization when the materials are heated by the basaltic magmas. A hydrothermal origin is discounted because the rocks contain high-temperature mineral assemblages and lack sulfi de minerals. It is proposed that the FeO*-Al 2 O 3 -TiO 2 -rich rocks of the Bana complex were formed by pyrometamorphism of laterite by the heat of basaltic magmas.

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“…On the basis of these results, crystals belonging to the same spinel-magnesiochromite series from the Olkhon metamorphic complex (Lake Baikal, Russia; Makrygina and Petrova 1998) were chosen in order to study their kinetic behavior. The selected crystals are characterized by low (Ch) and high (Sc) Cr 3+ contents, i.e., 0.03-0.06 and 0.24 atoms per four O atoms, respectively.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of cation ordering in natural Mg(Al,Cr3+)2O4 spinels

Princivalle

Martignago

Negro

2006

American Mineralogist

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The kinetics of cation ordering (quench method) in two natural Mg(Al 2-y Cr y )O 4 spinels (y~ 0.03-0.06 and 0.24), highly ordered in terms of Mg-Al, were studied by means of X-ray single-crystal diffraction. The equilibrium distribution of Mg and Al between tetrahedral and octahedral sites was investigated at 650 °C (in disordering and ordering) and at 850 °C (in ordering), through several time-steps to monitor the rate of cation distribution before equilibrium was achieved. The cation distributions for both disordering and ordering experiments were obtained by measuring the oxygen positional parameter u, which is correlated to the inversion parameter x (Al in T site), and then to the composition of the samples. The Mueller kinetic model, satisfactorily applied to the experimental data, allowed the calculation of the kinetic ordering constants K, linearly related to temperature by means of Arrhenius equations.The kinetics of ordering processes are infl uenced by Cr content. The equilibrium for both the isotherms at 650 and 850 °C was reached at different elapsed times by the low-and high-Cr spinels: the time for the low-Cr sample was, in both the ordering experiments, about double that of the highCr sample. Consequently, the activation energy (186 and 175 kJ/mol for low-and high-Cr samples, respectively) for the intracrystalline Mg-Al ordering decreases with Cr increase.

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The importance of geochemical data for geodynamic reconstruction: formation of the Olkhon metamorphic complex, Lake Baikal, Russia

Cited by 18 publications

References 11 publications

Metamorphic and chronological constraints on the early Paleozoic tectono‐thermal evolution of the Olkhon Terrane, southern Siberia

Metamorphic and chronological constraints on the early Paleozoic tectono‐thermal evolution of the Olkhon Terrane, southern Siberia

FeO*‐Al₂O₃‐TiO₂‐Rich Rocks of the Tertiary Bana Igneous Complex, West Cameroon

Kinetics of cation ordering in natural Mg(Al,Cr3+)2O4 spinels

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The importance of geochemical data for geodynamic reconstruction: formation of the Olkhon metamorphic complex, Lake Baikal, Russia

Cited by 18 publications

References 11 publications

Metamorphic and chronological constraints on the early Paleozoic tectono‐thermal evolution of the Olkhon Terrane, southern Siberia

Metamorphic and chronological constraints on the early Paleozoic tectono‐thermal evolution of the Olkhon Terrane, southern Siberia

FeO*‐Al2O3‐TiO2‐Rich Rocks of the Tertiary Bana Igneous Complex, West Cameroon

Kinetics of cation ordering in natural Mg(Al,Cr3+)2O4 spinels

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FeO*‐Al₂O₃‐TiO₂‐Rich Rocks of the Tertiary Bana Igneous Complex, West Cameroon