Geochemistry of metasomatised spinel peridotite xenoliths from the Dariganga Plateau, South-eastern Mongolia

Kononova, V. A.; Kurat, G.; Embey-Isztin, Antal; Pervov, V. A.; Koeberl, Christian; Brandstätter, F.

doi:10.1007/s007100200012

Cited by 16 publications

(11 citation statements)

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“…It was associated with roughly NNW shortening and ENE extension in the Cenozoic [ Webb and Johnson , ] that was considered to be a northern extension of the Altyn Tagh Fault at the northern margin of the Tibetan Plateau [ Yue and Liou , ]. Straddling the border between Mongolia and China, the Dariganga Lava Plateau is the largest Cenozoic lava field in present Mongolia [ Ho et al ., ; Kononova et al ., ; Wiechert et al ., ]. The Mesozoic extensional rifting and the Cenozoic intraplate magma activities may have also resulted in the crustal thinning in the South Gobi area.…”

Section: Discussionmentioning

confidence: 99%

“…South of the Zuunbayan Fault are Precambrian basement rocks and former island arcs that lie between the Zuunbayan Fault and Solonker Suture (Figure ). The Dariganga Volcano is located in the southeastern region of our research area, which represents the largest Cenozoic basalt field in Mongolia [ Ho et al ., ; Kononova et al ., ; Wiechert et al ., ].…”

Section: Introductionmentioning

confidence: 99%

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The crustal structure of south central Mongolia using receiver functions

Sandvol

et al. 2016

Tectonics

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The crustal thickness H and average crustal velocity ratio k (Vp/Vs) beneath south central Mongolia are investigated using the H-k stacking method based on teleseismic radial receiver functions. Our primary results reveal that the local crustal thickness varies from 38 to 46 km with an average value of 43 km. Thicker crust is found beneath the western Hentey Mountains, while thinner crust is located in the southern area of the Zuunbayan fault zone. The Bouguer gravity anomalies exhibit a strong correlation with the overall crustal thickness pattern throughout most of our study regime. Moreover, a new approach which integrates the Bouguer anomaly gradient and the receiver function-derived crustal thickness is adopted to calculate the density of the lower crust underneath central Mongolia. Fairly dense lower crust of approximately 3000 kg/m 3 is found in the Middle Gobi Desert. The measured crustal Vp/Vs ratio ranges from 1.68 to 1.83 with an average value of 1.74. Low Vp/Vs ratio is found beneath the western Hentey Mountains. In general, low Vp/Vs ratios correlate well with regions of quartz-rich crust and high heat flow. High Vp/Vs ratios occur in the Middle Gobi volcanic regions and the Mesozoic Southern Gobi Basin.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The crustal structure of south central Mongolia using receiver functions

Sandvol

et al. 2016

Tectonics

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“…It is worth noting that no Quaternary basalts are exposed in this region. In fact, the volcanic activity of the Abaga lava platform shows a similar eruptive age and active intensity as those of the Dariganga Plateau (Kononova et al, 2002).…”

Section: Abaga Lava Platformmentioning

confidence: 81%

Elemental and Sr-Nd-Pb isotopic compositions of late Cenozoic Abaga basalts, Inner Mongolia: Implications for petrogenesis and mantle process

Liu

Chen

et al. 2008

Geochem. J.

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“…Instead, they display distinct positively NbTa spikes (Figure b,d) and their 87 Sr/ 86 Sr and 143 Nd/ 144 Nd remain nearly constant, although the ratios of the basalts from different volcanic provinces are varied (Figure c,d). Furthermore, mantle xenoliths are common in all of the basalts in all of these volcanic fields (e.g., Ionov et al, ; Kononova et al, ; Zou et al, , reference therein), suggesting a rapid magma ascent and thereby having limited crustal residence time for significant contamination/assimilation.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, it is noted that the samples ABQ-28 and TG-26KH have abnormally high Pb (Figure 4b,d) and their 87 Sr/ 86 Sr and 143 Nd/ 144 Nd remain nearly constant, although the ratios of the basalts from different volcanic provinces are varied (Figure 8c,d). Furthermore, mantle xenoliths are common in all of the basalts in all of these volcanic fields (e.g., Ionov et al, 1995;Kononova et al, 2002;Zou et al, 2014, reference…”

Section: Crustal Contaminationmentioning

confidence: 99%

Major, trace element, and SrNd isotopic geochemistry of Cenozoic basalts in Central‐North and East Mongolia: Petrogenesis and tectonic implication

et al. 2018

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This paper presents new major element, trace element, and SrNd isotope data of Cenozoic basalts in volcanic provinces Hovsgol, Taatsiin Gol, and Dariganga‐Abaga in Northern, Central, and Eastern Mongolia, respectively, to explore the petrogenesis of the basalts and their geodynamic setting. Cenozoic volcanic rocks in Mongolia are dominated by basalts, belonging to alkaline and tholeiitic series, and are characterized by ocean island basalts (OIB)‐like major and trace element signature, such as enrichment of light REE relative to heavy REE and enrichment in both large‐ion lithophile elements (LILE) and high‐field‐strength elements (HFSE) with positive NbTa anomalies in primitive mantle‐normalized spider diagram. On the other hand, the Central‐North Mongolian basalts are higher in SiO2 and Al2O3 but lower in MgO, CaO, and TiO2 than East Mongolian basalts and display positive K anomaly, which is in contrast to the negative K anomaly of the latter. Despite the evolved nature of the Central‐North Mongolian basalts, the roles of crustal contamination and fractional crystallization, or assimilation coupled with fractional crystallization (AFC), are insignificant in the genesis of the basalt; instead, both the mantle heterogeneity and melting condition have significant contributions to the compositional variations of the basalts. Importantly, the SrNd isotopic signatures suggest that the mantle sources are characterized by mixing of two isotopic components, a depleted mantle (DM) and an enriched mantle (EM). Although, the EM component is variable, which can be ascribed to metasomatized subcontinent lithosphere (SCLM) and altered recycled oceanic crust (ROC) for the mantle sources of the Central‐North and East Mongolian basalts, respectively. Taking these results together with published age and high‐resolution tomographic data, we propose that all Cenozoic volcanism in Mongolia is related to shallow mantle (asthenosphere) upwelling stemming from the mantle transitional zone (MTZ), but the triggering causes for the mantle upwellings are different. The mantle upwelling related to generation of the Central‐North Mongolian basalts was likely triggered by a far‐field effect of the Indo‐Asian collision, which might have caused the avalanched/subducted materials of the Mongol‐Okhotsk and/or the Central Asian orogenic belt (CAOB) that sink into and stagnated within the MTZ. The mantle upwelling related to the formation of the East Mongolian basalts, which are located at the westernmost of the big mantle wedge constructed by the subducting and stagnant Pacific slab, was induced directly by the westward subduction of the Pacific Plate beneath East Asia.

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Geochemistry of metasomatised spinel peridotite xenoliths from the Dariganga Plateau, South-eastern Mongolia

Cited by 16 publications

References 0 publications

The crustal structure of south central Mongolia using receiver functions

The crustal structure of south central Mongolia using receiver functions

Elemental and Sr-Nd-Pb isotopic compositions of late Cenozoic Abaga basalts, Inner Mongolia: Implications for petrogenesis and mantle process

Major, trace element, and SrNd isotopic geochemistry of Cenozoic basalts in Central‐North and East Mongolia: Petrogenesis and tectonic implication

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