Melting of the subcontinental lithospheric mantle by the Emeishan mantle plume; evidence from the basal alkaline basalts in Dongchuan, Yunnan, Southwestern China

Song, Xie‐Yan; Qi, Hua-Wen; Robinson, Paul T.; Zhou, Mei‐Fu; Cao, Z.; Chen, Lie-Meng

doi:10.1016/j.lithos.2007.06.023

Cited by 133 publications

(78 citation statements)

References 59 publications

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“…The geochemistry of continental flood basalts in the Emeishan large igneous province (ELIP) has been interpreted as resulting from complex interactions between a mantle plume and heated lithospheric and asthenospheric mantle (Ali et al, 2005;Chung and Jahn, 1995;Hanski et al, 2004Hanski et al, , 2010Li et al, 2010;Song et al, 2008;Xu et al, 2001Xu et al, , 2004Zhang et al, 2008Zhang et al, , 2009. Although the Emeishan basalts are generally considered to be related to a mantle plume, the origin and chemical structure of the Emeishan plume is still a matter of debate.…”

Section: Introductionmentioning

confidence: 99%

Chemical heterogeneity of the Emeishan mantle plume: Evidence from highly siderophile element abundances in picrites

Wang

Ren

et al. 2014

Journal of Asian Earth Sciences

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a b s t r a c tHighly magnesian lavas or picrites have the potential to preserve important information about the origin and thermochemical state of the mantle source(s) of large igneous provinces. We have conducted a comprehensive study of highly siderophile element (HSE) concentrations in picrites from the ca. 260 Ma Emeishan large igneous province. We show that HSE abundances in the Emeishan picrites are greater than those in mid-ocean ridge basalts (MORBs) and parental melts of Hawaiian picrites, but are similar to those in komatiites. The picrites have two types of C1-normalized HSE patterns: (a) type 1, as represented by the Muli picrites is similar to that of the primitive upper mantle; (b) type 2, as represented by the Dali picrites resembles East Greenland and Iceland picrites. Pt/Ir and Pd/Ir ratios in the type 2 picrites are higher than those in type 1 picrites. The primary melt compositions of the studied samples have been estimated by back-addition of equilibrium olivine. The calculated HSE abundances of the parental liquids of the Dali and Muli picrites are higher than those of the parental melts to Hawaiian picrites. Along with previously published isotopic data, our study provides further evidence for chemical heterogeneity of the Emeishan mantle plume.

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Section: Introductionmentioning

confidence: 99%

Chemical heterogeneity of the Emeishan mantle plume: Evidence from highly siderophile element abundances in picrites

Wang

Ren

et al. 2014

Journal of Asian Earth Sciences

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“…Many researchers have used whole-rock major and trace element compositions and Sr-Nd-Os isotopes of basalts and picrites (whole-rock MgO > 16 wt.% and lack of olivine spinifex texture) to investigate the last aspect (e.g., Chung and Jahn, 1995;Xu et al, 2001;Song et al, 2001Song et al, , 2008Xiao et al, 2004;Hanski et al, 2004Hanski et al, , 2010Zhang et al, 2006Zhang et al, , 2008Li et al, 2010;Anh et al, 2011). Some researchers have also used PGE as complementary data (Zhang et al, 2005;Song et al, 2006Song et al, , 2009Wang et al, 2007Wang et al, , 2011.…”

Section: Introductionmentioning

confidence: 99%

Controls on PGE fractionation in the Emeishan picrites and basalts: Constraints from integrated lithophile–siderophile elements and Sr–Nd isotopes

Tao

et al. 2012

Geochimica et Cosmochimica Acta

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“…Green areas are Permian basalts. Inset illustrates the distribution of the Late Permian volcanic successions of the Emeishan large igneous province in southwestern China (modified from Song et al [2008], copyright 2008, with permission from Elsevier). Abbreviations are as follows: RRF, Red River fault; LMSF, Longmenshan Fault.…”

Section: Introductionmentioning

confidence: 99%

Magnetostratigraphic constraints on two‐stage eruptions of the Emeishan continental flood basalts

Zheng

Yang

Tong³

et al. 2010

Geochem Geophys Geosyst

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[1] Temporal and spatial variations of high and low contents of Ti basalts in the Permian Emeishan large igneous province (ELIP) of southwest China and Vietnam are crucial for modeling of continental basalt formation and the nature of mantle-lithosphere interaction. A combined geochemical and magnetostratigraphic study was carried out at Yanyuan in the inner zone of the ELIP. Geochemical results indicate that the basalts are low-Ti (LT) basalts (Ti/Y ∼ 484.2-511.4) in the Luomapu section and high-Ti (HT) basalts (Ti/Y ∼ 558.2-658.9) in the Gongmushan section. Systematic paleomagnetic sampling and stepwise thermal demagnetization demonstrate that the higher temperature component shows two distinct characteristic remanent magnetizations with northeasterly upward and SWW downward directions. These results indicate a simple magnetostratigraphic normal and reversed polarity pattern from the lower and upper parts of the section, respectively. By comparing with available magnetostratigraphic and paleomagnetic data carried out in the ELIP, these results imply that the eruption of the Emeishan basalts can be divided into early (normal polarity subchron) and late (reversal subchron) stages. The early stage included LT basalts in the inner zone and most of the HT basalts in the intermediate and outer zones, and the late stage contained a part of LT and HT basalts in the upper parts of the sections in the inner zone and a few in the intermediate zone of the ELIP. Correlating with available Middle-Late Permian magnetostratigraphy and the Permian magnetic time scale, the new magnetic polarity sequence result suggests that the ELIP formed over a very short time interval (<1 Myr).

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Melting of the subcontinental lithospheric mantle by the Emeishan mantle plume; evidence from the basal alkaline basalts in Dongchuan, Yunnan, Southwestern China

Cited by 133 publications

References 59 publications

Chemical heterogeneity of the Emeishan mantle plume: Evidence from highly siderophile element abundances in picrites

Chemical heterogeneity of the Emeishan mantle plume: Evidence from highly siderophile element abundances in picrites

Controls on PGE fractionation in the Emeishan picrites and basalts: Constraints from integrated lithophile–siderophile elements and Sr–Nd isotopes

Magnetostratigraphic constraints on two‐stage eruptions of the Emeishan continental flood basalts

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