The origin of the Zhubu mafic-ultramafic intrusion of the Emeishan large igneous province, SW China: Insights from volatile compositions and C-Hf-Sr-Nd isotopes

Tang, Qingyan; Zhang, Mingjie; Wang, Yuekun; Yao, Yunsheng; Du, Lidong; Chen, Lie-Meng; Li, Zhongping

doi:10.1016/j.chemgeo.2017.02.009

Cited by 10 publications

(12 citation statements)

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“…The Emeishan LIP covers an area of 0.3 × 10 6 km 2 of the western margin of the Yangtze Block, eastern part of the Tibetan Plateau and northern Vietnam and consists of flood basalts, spatially associated with felsic plutons and layered mafic-ultramafic intrusions. Some of these intrusions host giant Fe-Ti-V oxide deposits and Ni-Cu-(PGE) sulphide deposits, such as Panzhihua, Hongge, Limahe, and Zhubu (Figure 1; Tang, Ma, Zhang, et al, 2013;Tang, Zhang, et al, 2017;Wang et al, 2007;Zhou et al, 2008). The volcanic succession includes picrites, basalts, basaltic andesites, rhyolites, and trachytes (Yu et al, 2017).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The grains were then rinsed with distilled water until the pH value of the rinsing water reached~7. The cleaned samples were baked at 110 C prior to chemical analysis Tang, Zhang, et al (2017) and . for the determination of chemical compositions and carbon isotopes, respectively, in the Key Lab of Gas Geochemistry, Chinese Academy of Sciences, Lanzhou, China.…”

Section: Sample Preparationmentioning

confidence: 99%

“…for the determination of chemical compositions and carbon isotopes, respectively, in the Key Lab of Gas Geochemistry, Chinese Academy of Sciences, Lanzhou, China. The volatile extraction procedures and chemical analysis are described in detail by Tang, Zhang, et al (2017) and .…”

Section: Sample Preparationmentioning

confidence: 99%

“…It is believed that the Emeishan large igneous province (LIP) is genetically related to a major~260 Ma plume event (e.g., Xu et al, 2004Xu et al, , 2008Zhang et al, 2006;Zhou et al, 2002Zhou et al, , 2006, which has a genetic connection with several world-class Fe-Ti-V oxide deposits, as well as several Cu-Ni-(PGE) sulphide deposits (e.g., Tang, Ma, Zhang, et al, 2013;Tang, Zhang, et al, 2017;Wang et al, 2018;Zhang, Mao, et al, 2009;Zhou et al, 2005Zhou et al, , 2008 and references therein). The Emeishan LIP consists of Permian flood basalts and coeval intrusive rocks with compositions varying from mafic-ultramafic rocks to syenites and granites.…”

Section: Introductionmentioning

confidence: 99%

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The origin of volatiles in the Emeishan large igneous province, China: Constraints from chemical and C–He–Ar isotopic compositions of volatiles in picrites and basalts

Tang

Bao

et al. 2021

Geological Journal

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The Emeishan large igneous province (LIP) consists of Permian flood basalts and coeval intrusive rocks with compositions varying from mafic-ultramafic rocks to syenites and granites. The volatiles in the Emeishan LIP are dominated by H 2 O with high H 2 , indicating that the plume-derived magma was generated under a reduced condition. Picrite has minor contents of H 2 S without detectable SO 2 , and the basalt samples show no detectable H 2 S and SO 2 , indicating that the basaltic magma may have undergone sulphur-saturation during magma evolution. The δ 13 C values of CO 2 andCH 4 in picrites and basalts are between the values of mantle and crustal organic carbon. This, together with the distribution patterns among CH 4 homologue, indicates contribution of recycled sediments to the Emeishan mantle-derived magma. The 3 He/ 4 He ratios of volatiles extracted from olivine and pyroxene phenocrysts of picrites vary from 0.01 to 0.66 Ra, and those from pyroxene separates of olivine websterite samples in the Zhubu intrusion vary from 0.92 to 1.05 Ra. The low 3

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Section: Geological Backgroundmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The origin of volatiles in the Emeishan large igneous province, China: Constraints from chemical and C–He–Ar isotopic compositions of volatiles in picrites and basalts

Tang

Bao

et al. 2021

Geological Journal

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“…The CO 2 and hydrocarbon gases from different origins show distinct carbon isotopic compositions and distribution patterns, which can be used to constrain various terrestrial reservoirs [10,21,22,37,48,51]. The CO 2 and CH 4 released at 200-400°C were mainly released from secondary fluid inclusions and cracked primary fluid inclusions (Figure 3(b)), since the atmospheric component adsorbed in the samples is generally degassed at low temperature during step heating [49].…”

Section: Geofluidsmentioning

confidence: 99%

The Petrogenesis of the Permian Podong Ultramafic Intrusion in the Tarim Craton, Western China: Constraints from C-He-Ne-Ar Isotopes

Zhang

Feng

et al. 2019

Geofluids

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The Podong Permian ultramafic intrusion is only one ultramafic intrusion with massif Ni-Cu sulfide mineralization in the Pobei layered mafic-ultramafic complex, western China. It is obviously different in sulfide mineralization from the nearby coeval Poyi ultramafic intrusion with the largest disseminated Ni-Cu sulfide mineralization and mantle plume contribution (Zhang et al., 2017). The type and addition mechanism of the confirmed crustal contaminations and possible mantle plume involved in the intrusion formation require evidences from carbon and noble gas isotopic compositions. In the present study, we have measured C, He, Ne, and Ar isotopic compositions of volatiles from magmatic minerals in the Podong ultramafic intrusion. The results show that olivine, pyroxene, and plagioclase minerals in the Podong intrusion have variable δ13C of CO2 (-24.5‰ to -3.2‰). The CH4, C2H6, C3H8, and C4H10 hydrocarbon gases show normal or partial reversal distribution patterns of carbon isotope with carbon number and light δ13C1 value of CH4, indicating the hydrocarbon gases of biogenic origin. The δ13C of CO2 and CH4 suggested the magmatic volatile of the mantle mixed with the volatiles of thermogenic and crustal origins. Carbon and noble gas isotopes indicated that the Podong intrusion could have a different petrogenesis from the Poyi ultramafic intrusion. Two types of contaminated crustal materials can be identified as crustal fluids from subducted altered oceanic crust (AOC) in the lithospheric mantle source and a part of the siliceous crust. The carbon isotopes for different minerals show that magma spent some time crystallizing in a magma chamber during which assimilation of crustal material occurred. Subduction-devolatilization of altered oceanic crust could be the best mechanism that transported large proportion of ASF (air-saturated fluid) and crustal components into the mantle source. The mantle plume existing beneath the Poyi intrusion could provide less contribution of real materials of silicate and fluid components.

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Contrasting magmatic controls on the genesis of Fe-Ti-V oxide deposits in the Emeishan large igneous province using apatite Sr-Nd isotopes and apatite-zircon trace elements

Tang,

Li,

Liu

et al. 2023

Miner Deposita

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We use Sr-Nd isotopes of apatite and trace element compositions of apatite-zircon pairs from a major ore layer in each of three selected magmatic Fe-Ti-V oxide ore deposits (Hongge, Panzhihua, and Taihe) in the Emeishan large igneous province (LIP) in southwestern China to contrast the magmatic controls on ore formation. The average contents of REEs in apatite from a representative ore zone/layer in each of these deposits are higher than the predicted values of apatite crystallizing from a melt with REE contents assumed to be the same as the average values of high-Ti basalts in the Emeishan LIP, confirming that the ore-forming magmas all experienced higher degrees of fractional crystallization by major silicate minerals than the average basalt. The apatites Sm/Yb and Sr/Y indicate that the Panzhihua magma was generated at a shallower depth and experienced higher degree of plagioclase fractional crystallization than Taihe and Hongge. The apatite Sr-Nd isotopes can be reproduced by ~ 8 wt% contamination with Precambrian gneiss-schist in the parental magma for Hongge and by ~ 10 wt% and ~ 25 wt% contamination with marbles in the parental magmas for Panzhihua and Taihe, respectively. A recycled, high-T altered oceanic gabbroic component in the mantle source is a viable alternative to the marble contamination model for Taihe. Coexisting zircon trace element compositions reveal that the parental magma for Taihe (ΔFMQ+4.0) is more oxidized than those for Hongge (ΔFMQ−0.4) and Panzhihua (ΔFMQ−0.7), questioning that magma oxidation played a critical role in the genesis of Fe-Ti-V oxide ore deposits in the Emeishan LIP.

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The origin of the Zhubu mafic-ultramafic intrusion of the Emeishan large igneous province, SW China: Insights from volatile compositions and C-Hf-Sr-Nd isotopes

Cited by 10 publications

References 64 publications

The origin of volatiles in the Emeishan large igneous province, China: Constraints from chemical and C–He–Ar isotopic compositions of volatiles in picrites and basalts

The origin of volatiles in the Emeishan large igneous province, China: Constraints from chemical and C–He–Ar isotopic compositions of volatiles in picrites and basalts

The Petrogenesis of the Permian Podong Ultramafic Intrusion in the Tarim Craton, Western China: Constraints from C-He-Ne-Ar Isotopes

Contrasting magmatic controls on the genesis of Fe-Ti-V oxide deposits in the Emeishan large igneous province using apatite Sr-Nd isotopes and apatite-zircon trace elements

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