Primitive magmas in the Emeishan Large Igneous Province, southwestern China and northern Vietnam

Hanski, Eero; Kamenetsky, Vadim S.; Luo, Zhaohui; Xu, Yi–Gang; Kuzmin, D. V.

doi:10.1016/j.lithos.2010.04.008

Cited by 91 publications

(94 citation statements)

References 67 publications

(116 reference statements)

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“…Such depleted εNd(t) mafic rocks from the Song Da igneous suite were derived from a mantle plume and correspond with the southern extension of the Emeishan LIP (Hanski et al, 2004;Wang et al, 2007;Hanski et al, 2010;He et al, 2010;Tran Viet Anh et al, 2011;Vladimirov et al, 2012;Usuki et al, 2015). Conversely, enriched εNd(t) mafic rocks from the Emeishan LIP, including those at Song Da, are thought to have formed from interaction between depleted mafic magma and enriched lithosphere, the latter including crustal rocks (Chung and Jahn, 1995;Wang et al, 2007;Hanski et al, 2010;Tran Viet Anh et al, 2011;Shellnutt, 2014). The enriched εNd(t) rocks possess high-LREE/HREE ratios (Chung and Jahn, 1995), and values for the Kontum Massif metagabbros overlap with those of the Song Da mafic units (Fig.…”

Section: Magmatic Process Of Metagabbro Formationmentioning

confidence: 99%

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Late Permian plume–related magmatism and tectonothermal events in the Kontum Massif, central Vietnam

Owada

Osanai

Nakano

et al. 2016

Journal of Mineralogical and Petrological Sciences

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The Kontum Massif is situated in the southern part of Trans Vietnam Orogenic Belt (TVOB), central Vietnam, and contains various types of magmatic and metamorphic rocks, the latter including both ultrahigh-pressure and ultrahigh-temperature units. While geochronological data indicate the existence of two main tectonothermal events at 480-420 Ma and 270-240 Ma, the most intense metamorphic and magmatic activity occurred between the Late Permian and Early Triassic due to continental collision between the South China and Indochina cratons. In this study, U-Pb LA-ICP-MS geochronological analyses of zircon obtained from two samples of metagabbro and one sample of charnockite from the massif yielded a magmatic age range of 260-250 Ma for all three samples and an inherited age of~1400 Ma for the charnockite. These magmatic ages overlap with those documented for peak metamorphism in the Kontum Massif. When combined with Nd isotopic data for granitic rocks and pelitic gneisses from the region, these data suggest that the massif may have been derived from reworked continental crust. Geochemical characteristics of metagabbros from the massif reveal that the parental basaltic magma can be correlated with the Song Da igneous suite situated in the northern part of the TVOB, and was assimilated by crustal materials. The Song Da igneous suite is a member of the Emeishan large igneous province and resulted from Late Permian mantle plume activity. We conclude that the plume-related magma intruded into the deeper part of Kontum Massif and induced ultrahigh-temperature metamorphism of the lower crust by acting as a heat source.

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Section: Magmatic Process Of Metagabbro Formationmentioning

confidence: 99%

“…The Song Da igneous suite formed in the marginal part of the Emeishan plume (Hanski et al, 2010;He et al, 2010). The geochemistry and melting depth of the Emeishan LIP mafic magmas suggest that the lithospheric lid of the Emeishan plume was thicker at its periphery than at its head ( fig.…”

Section: Magmatic Process Of Metagabbro Formationmentioning

confidence: 99%

Late Permian plume–related magmatism and tectonothermal events in the Kontum Massif, central Vietnam

Owada

Osanai

Nakano

et al. 2016

Journal of Mineralogical and Petrological Sciences

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“…High temperature ultramafic volcanic rocks are recognized within the inner zone of the ELIP (Hanski et al 2004(Hanski et al , 2010Hou et al 2006;Zhang et al 2006;Wang et al 2007;Ali et al 2010;He et al 2010;Kamenetsky et al 2012). There are also correlative units, including picrite, in the Song Da zone of northern Vietnam which was translated by ~600 km sinistral offset during the Paleogene activation of the Ailao Shan-Red River fault system (Chung et al 1997).…”

Section: Ultramafic Volcanic Rocksmentioning

confidence: 99%

“…> 20%) amount of melting from a garnet-bearing mantle source (Hanski et al 2004(Hanski et al , 2010Zhang et al 2006;Wang et al 2007;Kamenetsky et al 2012). However, there are different interpretations regarding the nature of their source.…”

Section: Ultramafic Volcanic Rocksmentioning

confidence: 99%

“…However, there are different interpretations regarding the nature of their source. The prevailing view is that the ultramafic rocks are pristine primitive melts from the starting plume-head that were modified, in some cases, via interactions with one of, or a combination of crustal material and lithospheric mantle melts and assimilation-fractional crystallization (AFC) processes (Hanski et al 2004(Hanski et al , 2010Zhang et al 2006;Wang et al 2007;Li et al 2010;He et al 2010). Some of the picrite shows the most depleted Sr-Nd-Os isotope signatures (i.e.…”

Section: Ultramafic Volcanic Rocksmentioning

confidence: 99%

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Igneous Rock Associations 16. The Late Permian Emeishan Large Igneous Province

Shellnutt

2015

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Weak Vertical Surface Movement Caused by the Ascent of the Emeishan Mantle Anomaly

et al. 2018

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Prevailing mantle plume models reveal that the roles of plume‐lithosphere interactions in shaping surface topography are complex and controversial, and also difficult to test. The exposed and complete strata in the Emeishan large igneous province (LIP) recorded abundant paleoenvironmental information associated with preeruptions and syneruptions, attracting numerous workers to this province to test these models. Despite intensified research these models are still strongly debated. This study represents an extensive field investigation combining new and previously published data from the Emeishan LIP to further seek information on plume‐induced topographic variations. Our results indicate that there are inconspicuous vertical motions of the surface topography during the ascent of mantle plume, and a significant surface subsidence occurred at the early stage of the volcanism that has a significantly positive correlation with the thickness of local lavas, and the topographic uplift emerged in the late stage of the volcanism. Our studies provide key geological and geochemical evidence that the ascent of the Emeishan plume is unable to drive a significant surface uplift, owing to the plume containing numerous entrained bodies of dense recycled oceanic crust (10–20%) that can significantly reduce plume buoyancy. The significant surface subsidence maybe linked to a significant loss of thermal buoyancy due to the release of heat, which, accompanied by rapid loading of numerous dense erupted lava and a strong lithospheric flexure, also lead to a later synchronous and significant surface subsidence in the Emeishan LIP.

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Primitive magmas in the Emeishan Large Igneous Province, southwestern China and northern Vietnam

Cited by 91 publications

References 67 publications

Late Permian plume–related magmatism and tectonothermal events in the Kontum Massif, central Vietnam

Late Permian plume–related magmatism and tectonothermal events in the Kontum Massif, central Vietnam

Igneous Rock Associations 16. The Late Permian Emeishan Large Igneous Province

Weak Vertical Surface Movement Caused by the Ascent of the Emeishan Mantle Anomaly

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