Re–Os isotopic compositions of picrites from the Emeishan flood basalt province, China

Zhang, Zhaochong; Zhi, Xiachen; Chen, Lei; Saunders, Andrew D.; Reichow, Marc K.

doi:10.1016/j.epsl.2008.09.005

Cited by 97 publications

(42 citation statements)

References 75 publications

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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: 98%

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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Section: Introductionmentioning

confidence: 98%

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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“…Some studies have suggested that the Emeishan mantle plume originated at the coremantle boundary (CMB) as in the case of the Siberian CFBs (e.g., Li et al, 2010;Hanski et al, 2004;Lo et al, 2002). However, others studies consider that the Emeishan mantle plume originated from the upper-lower mantle boundary (e.g., Zhang et al, 2008). Abundances of highly siderophile elements (HSEs) are useful for characterizing the geochemical history of mantle reservoirs (e.g., Chazey Iii and Neal, 2005;Dale et al, 2008;Ireland et al, 2009;Jamais et al, 2008;Maier et al, 2009;Puchtel and Humayun, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…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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“…The second stage, lava sequences of LT and HT volcanic rocks occurred in the upper part of the sections in the western ELIP (inner zone), and a few high-Ti basalts in the east of the ELIP. The depleted mantle source might have been locally modified by subducted oceanic crust so as to generate an enriched mantle source from which minor LREE-enriched picrites formed [Wang et al, 2007;Zhang et al, 2008].…”

Section: Magnetic Polarity Sequence and Regional Correlationmentioning

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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Re–Os isotopic compositions of picrites from the Emeishan flood basalt province, China

Cited by 97 publications

References 75 publications

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

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

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

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

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