Petrogenetic modeling of three mafic–ultramafic layered intrusions in the Emeishan large igneous province, SW China, based on isotopic and bulk chemical constraints

Zhang, Zhaochong; Mao, Jingwen; Saunders, Andrew D.; Yu, Aibing; Li, Ying; Zhao, Li

doi:10.1016/j.lithos.2009.04.023

Cited by 161 publications

(75 citation statements)

References 66 publications

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“…This conclusion is also consistent with low degrees of crustal contamination of the Panzhihua intrusion demonstrated by Sr-Nd-Pb-O isotopic compositions of the intrusions in the Panxi region [10]. Because clinopyroxene crystallized before fluids were trapped into magma, the Sr-Nd-Pb isotopic compositions of clinopyroxene may not be affected by the addition of fluids.…”

Section: Variations Of Volatile Compositions Of Magnetite Clinopyroxsupporting

confidence: 82%

“…Ganino et al [9] inferred that abundant CO 2 -rich fluids released from the Dengying Formation may have increased the magma oxygen fugacity (f O 2 ), resulting in an early crystallization of magnetite. However, Zhang et al [10] considered that the Panzhihua intrusion has not experienced significant crustal contamination and it is unlikely to have any influx of fluids via the interaction of magmas and wall rocks. The questions are: (1) there is no direct evidence for the involvement of CO 2 -rich fluids to the magmas; (2) if CO 2 -rich fluids do exist in the magmas, where they are from; (3) is there any other type of fluids involved in the magmas?…”

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confidence: 99%

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Volatile and C-H-O isotopic compositions of giant Fe-Ti-V oxide deposits in the Panxi region and their implications for the sources of volatiles and the origin of Fe-Ti oxide ores

Xing

Wang

Zhang

2012

Sci. China Earth Sci.

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The Panzhihua, Hongge, and Baima Fe-Ti-V oxide deposits in the Panzhihua-Xichang (Panxi) region are hosted in large layered mafic-ultramafic intrusions. The layered intrusions intrude either the Neoproterozoic Dengying Formation, composed mainly of limestone, or the Paleoproterozoic Hekou Formation, composed of meta-sedimentary-volcanic rocks. It remains unclear if the wall rocks have been involved during the fractionation of magmas and have affected the sequence of crystallization of Fe-Ti oxide. Volatiles and their C-H-O isotopic compositions of magnetite, apatite, clinopyroxene, and plagioclase of different types of ores from the three intrusions are analyzed using a technique of stepwise heating mass spectrometer to evaluate the role of wall rocks in the formation of Fe-Ti oxide ores. Volatiles released from magnetite are composed mainly of H 2 O and CO 2 , whereas the other minerals are composed mainly of H 2 O, CO 2 and H 2 . At 800-1200°C temperature interval, the average  13 C values of CO 2 of all the minerals from the three intrusions range from 7.7‰ to 13.5‰ and the average  18 O CO 2 values from 19.1‰ to 19.5‰, which are scattered in a mixed field with basalt and the two types of wall rocks as end-members, indicating that CO 2 from the wall rocks may have been involved in the magmas from which the three intrusions formed. At 400-800C temperature interval, both  13 C values (13.7‰ to 17.9‰ on the average) and  18 O values (16.2‰ to 19.2‰ on the average) of CO 2 of all the minerals are lower than those for 800-1200C temperature interval, and much closer to the values of the wall rocks. Abundant H 2 O released at the 400-800C temperature interval has relatively low   D values ranging from 90‰ to 115‰, also indicating the involvement of fluids from the wall rocks. The average bulk contents of volatiles released from magnetite of the Hongge, Baima, and Panzhihua intrusions are 4891, 2996, and 1568 mm 3 STP/g, respectively, much higher than those released from other minerals in total, which are 382, 600, and 379 mm 3 STP/g, respectively, indicating that magnetite crystallized from magmas with much more volatiles than other minerals. This can be interpreted as that crystallization of clinopyroxene and plagioclase in the early fractionation of magmas resulted in volatiles such as H 2 O that were eventually enriched in the residual magmas and, at the same time, fluids from the wall rocks may have been involved in the magmas and were trapped in magnetite, which crystallized later than clinopyroxene and plagioclase. Three giant Fe-Ti-V oxide deposits in the Panxi (Panzhihua-Xichang) region, SW China, are hosted in the Panzhihua, Hongge, and Baima layered mafic-ultramafic intrusions. These intrusions are unique in that large amounts of massive and semi-massive ores occur in the lower parts of the intrusions, whereas rhythmic layering composed of vari-

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Section: Variations Of Volatile Compositions Of Magnetite Clinopyroxsupporting

confidence: 82%

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confidence: 99%

Volatile and C-H-O isotopic compositions of giant Fe-Ti-V oxide deposits in the Panxi region and their implications for the sources of volatiles and the origin of Fe-Ti oxide ores

Xing

Wang

Zhang

2012

Sci. China Earth Sci.

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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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“…It is believed that the Emeishan large igneous province (ELIP) is genetically related to a major $260 Ma plume event (e.g., Thompson et al, 2001;Xu et al, 2004;Ali et al, 2010), which has a genetic connection with several world-class Fe-Ti-V oxide deposits, as well as several Cu-Ni-(PGE) sulfide deposits (e.g., Zhang et al, 2009 and references therein). These particular features distinguish the Emeishan LIP from other LIPs that formed near the end of the Permian in widely separated locations such as the Siberian Traps (Sharma, 1997;Dobretsov, 2005) and Panjal Traps of northwestern India (e.g., Bhat et al, 1981).…”

Section: Introductionmentioning

confidence: 99%

“…1016/j.gca.2011.09.003 Most previous petrologic and geochemical studies focused on magma chamber processes (e.g., Zhong et al, 2002Zhong et al, , 2004Zhong et al, , 2011Zhou et al, 2005;Wang et al, 2008;Pang et al, 2010) and the depth of melting (e.g., Zhou et al, 2008). The metallogenesis of the Fe-Ti-V oxide deposits is generally thought to be closely related to the nature of their sources (e.g., Zhang et al, 2009). However, the aspect of the source composition has so far received little attention.…”

Section: Introductionmentioning

confidence: 99%

Noble gas isotopic systematics of Fe–Ti–V oxide ore-related mafic–ultramafic layered intrusions in the Panxi area, China: The role of recycled oceanic crust in their petrogenesis

Hou

Zhang

et al. 2011

Geochimica et Cosmochimica Acta

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Petrogenetic modeling of three mafic–ultramafic layered intrusions in the Emeishan large igneous province, SW China, based on isotopic and bulk chemical constraints

Cited by 161 publications

References 66 publications

Volatile and C-H-O isotopic compositions of giant Fe-Ti-V oxide deposits in the Panxi region and their implications for the sources of volatiles and the origin of Fe-Ti oxide ores

Volatile and C-H-O isotopic compositions of giant Fe-Ti-V oxide deposits in the Panxi region and their implications for the sources of volatiles and the origin of Fe-Ti oxide ores

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

Noble gas isotopic systematics of Fe–Ti–V oxide ore-related mafic–ultramafic layered intrusions in the Panxi area, China: The role of recycled oceanic crust in their petrogenesis

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