Geology, Geochronology, and Geodynamics of the Khan Bogd alkali granite pluton in southern Mongolia

Коваленко, В. И.; Yarmoluyk, V. V.; Сальникова, Е. Б.; Kozlovsky, A. M.; Котов, А. Б.; Ковач, В. П.; Саватенков, В. М.; Vladykin, N. V.; Пономарчук, В. А.

doi:10.1134/s0016852106060033

Cited by 72 publications

(48 citation statements)

References 4 publications

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“…For the Permian mafic complexes from Mandula area, the samples generally have low REE, LREE-depleted chondrite-normalized N-MORB type REE patterns, relatively high ε Nd (t) (3.4-8.0) and high Mg # (49)(50)(51)(52)(53)(54). All these features indicate that the parental magma originated from the depleted asthenosphere.…”

Section: The Source Of the Mandula Mafic Rocksmentioning

confidence: 89%

Geochronology, geochemistry, and its geological significance of the Permian Mandula mafic rocks in Damaoqi, Inner Mongolia

Chen

Zhang

Guo

et al. 2011

Sci. China Earth Sci.

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The Hujierte-Chaganhadamiao volcanic-plutonic sequence is located in the Mandula area of northern Damaoqi, Inner Mongolia. It contains mainly mafic volcanics, with several ultramafic blocks in its central part and mafic-intermediate intrusions in the east. The zircon U-Pb ages of the gabbro and basalt samples are 278.5±3.0 Ma (MSWD=0.66) and 273.7±1.0 Ma (MSWD=0.36), respectively. These ages constrain the magmatism occurred in the Early Permian. The Mandula Permian mafic rocks are characterized by low abundances of REE and slightly LREE-enriched chondrite-normalized N-MORB-type REE patterns. And these mafic samples have high ( 143 Nd/ 144 Nd) i (0.51262-0.51270), relatively high positive ε Nd (t) (3.4-8.0), and high Mg # (49-54), suggesting derivation from the depleted asthenosphere mantle source. But they also show the enrichment in large ion lithophile elements (LILE, e.g. Rb, Ba and Sr), depletion in high field strength elements (HFSE); distinctly negative Nb, Ta anomalies and slightly negative P, Ti anomalies; high ( 87 Sr/ 86 Sr) i (0.70490-0.70537), low ( 206 Pb/ 204 Pb) i (17.39-17.93).All of these resemble the characteristics of the enriched mantle source or involvement of arc materials in the magma genesis. Furthermore, as shown in the correlation plots of ε Nd (t) vs ( 87 Sr/ 86 Sr) i , ( 206 Pb/ 204 Pb) i vs ( 207 Pb/ 204 Pb) i and ( 208 Pb/ 204 Pb) i , La/Ba La/Nb vs La/Nb, and La/Nb ratio, the magma source could have been experienced the contamination and metasomation from the previous subduction process. And the positive correlation between the selected major oxides and trace elements could be explained by the contamination from continental crust and arc materials during the magmatic emplacement. Combined with the distinct geochemistry features of Mandula mafic samples and many previous researches in the study area, the Early Permian magmatism in Mandula occurred under an extensional rift setting, and a juvenile ocean basin probably had already been formed after further development. Mandula, zircon SHRIMP U-Pb age, Permian, geochemistry, extensional settingCitation:Chen C, Zhang Z C, Guo Z J, et al. Geochronology, geochemistry, and its geological significance of the Permian Mandula mafic rocks in Damaoqi,

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Section: The Source Of the Mandula Mafic Rocksmentioning

confidence: 89%

Geochronology, geochemistry, and its geological significance of the Permian Mandula mafic rocks in Damaoqi, Inner Mongolia

Chen

Zhang

Guo

et al. 2011

Sci. China Earth Sci.

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“…Geophysical study of Guy et al (2014b) has shown that this tectono-magmatic zone spatially coincides with a strong, c. 15-20 km deep magnetic lineament. The analysis of magnetic lineaments in SW Mongolia also demonstrates that the zones of magnetic highs coincide with other E-W trending Late Paleozoic volcano-plutonic provinces previously defined by Kovalenko et al (2006) as continental rifts related to Pacific-type geodynamic processes and protracted activity of mantle plumes (Yarmolyuk et al 2014). Indeed the geophysical lineaments and magmatic zones can be interpreted as tectono-magmatic deformation zones deeply rooted in the lithosphere that probably channelled mantle-derived magmas (Guy et al 2015).…”

Section: Geodynamic Contextmentioning

confidence: 97%

“…The Khan Bogd Massif in the southern Gobi is Early Permian (e.g. Sandimirova et al 1980;Vladykin et al 1981; Kovalenko et al 2006). Alkaline signatures were described in the Permian post-tectonic plutons along the Trans-Altai shear zones and some such magmatic rocks form the Gobi-Tien Shan Batholith (Hanžl et al 2008) and Tsagaan Bogd Massif (Kozlovsky et al 2012).…”

Section: Geological Settingmentioning

confidence: 99%

“…Kovalenko et al 2006;Buriánek et al 2012). This suggests an intrusion at relative shallow crustal levels; however, its exact mecha- nism and depth of emplacement has not yet been studied.…”

Section: P-t Conditionsmentioning

confidence: 99%

“…The Sagsai Pluton belongs to a series of Late Carboniferous to Permian granitoids which form a linear E-W belt along the contact of the Mongol Altai and Trans-Altai tectonic zones (Kovalenko et al 2006;Guy et al 2014a). Geophysical study of Guy et al (2014b) has shown that this tectono-magmatic zone spatially coincides with a strong, c. 15-20 km deep magnetic lineament.…”

Section: Geodynamic Contextmentioning

confidence: 99%

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Petrogenesis of the Late Carboniferous Sagsai Pluton in the SE Mongolian Altai

Buriánek¹,

Janoušek²,

Hanžl³

et al. 2016

J. Geosci.

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Sagsai Pluton intruded the low-grade metavolcanosedimentary complex of the Cambrian Tugrug Fm. in the Sagsai river valley SW of Tsogt soum, Gobi-Altai aimag (SE Mongolian Altai). This oval body (~9 × 12 km) is composed mainly of amphibole monzogabbros to quartz diorites, biotite to amphibole-biotite syenites to quartz monzonites. It is intruded by anatectic two-mica granites along the W rim. The abundant mafic microgranular enclaves enclosed by syenites to quartz monzonites are interpreted as an evidence of vigorous magma mingling and mixing. The newly obtained LA ICP-MS zircon ages for two samples of quartz monzonites gave emplacement ages of 307 ± 1 Ma and 309 ± 2 Ma (2σ), respectively. The zircons highly have ε t Hf values varying broadly from +2.4 to +11.6 ruling out a participation of an old, mature crust. One gabbro body gave zircon U-Pb age of 322 ± 2 Ma with positive ε t Hf values of +7.4 to +11.5. The latter suggest an exclusively juvenile, depleted mantle-derived magma source. According to calculated P-T conditions, we propose three main stages in the Sagsai Pluton evolution. The gabbro started to grow at >1000 °C and 0.8-0.9 GPa. The ensuing magma mixing with crustal melts and final crystallization of gabbro occurred at similar P-T conditions (740-830 °C and 0.5-0.6 GPa) as partial melting of migmatite xenoliths in the Sagsai Pluton. The P-T conditions of the Sagsai Pluton final emplacement calculated from quartz syenite (c. 600 to 670 °C and 0.4-0.5 GPa) are consistent with the mineral assemblage in the contact aureole (cordierite-biotite and biotite-chlorite schists). The magmatic evolution of Sagsai Pluton confirms a model of deep lithosphere thermal anomaly associated with heterogeneous melting of crust in a post-subduction extensional regime, perhaps shortly after the slab break-off.

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Geophysical constraints for terrane boundaries in southern Mongolia

et al. 2014

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The Central Asian Orogenic Belt (CAOB) is a typical accretionary orogen divided into numerous lithostratigraphic terranes. In theory, these terranes should be characterized by contrasting magnetic and gravity signatures owing to their dissimilar petrophysical properties. To test this hypothesis, the extent of tectonostratigraphic terranes in southern Mongolia was compared with the potential field data. The analysis reveals that the terrane boundaries are not systematically defined by strong gravity and magnetic gradients. The correlation of the magnetic signal with the geology reveals that the magnetic highs coincide with Late Carboniferous to Early Permian volcanic-plutonic belts. The matched filtering shows a good continuity of signal along the boundaries of these high magnetic anomalies toward the deeper crustal levels which may indicate the presence of deeply rooted tectonomagmatic zones. The axes of high-density bodies in the western and central parts of the study area are characterized by periodic alternations of NW-SE trending gravity anomalies corresponding to up to 20 km wide cleavage fronts of Permo-Triassic age. The matched filtering analysis shows good continuity of signal to the depth of these gravity highs which may indicate presence of deeply rooted high-strain zones. The magnetic signal is interpreted to be as the result of a giant Permo-Triassic magmatic event associated with lithosphere-scale deformation, whereas the gravity pattern is related to the postaccretionary shortening of the CAOB between the North China and Siberia cratons.

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Geology, Geochronology, and Geodynamics of the Khan Bogd alkali granite pluton in southern Mongolia

Cited by 72 publications

References 4 publications

Geochronology, geochemistry, and its geological significance of the Permian Mandula mafic rocks in Damaoqi, Inner Mongolia

Geochronology, geochemistry, and its geological significance of the Permian Mandula mafic rocks in Damaoqi, Inner Mongolia

Petrogenesis of the Late Carboniferous Sagsai Pluton in the SE Mongolian Altai

Geophysical constraints for terrane boundaries in southern Mongolia

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