Chemical and stable isotopic constraints on the nature and origin of volatiles in the sub-continental lithospheric mantle beneath eastern China

Zhang, Mingjie; Hu, Peiqing; Niu, Yaoling; Su, Shi-Bing

doi:10.1016/j.lithos.2006.10.006

Cited by 41 publications

(30 citation statements)

References 40 publications

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“…Possibility of such an enrichment is substantiated by experimental work of Xing et.al., [76], who have demonstrated by using step-heating mass spectrometer the presence of H 2 O + CO 2 at much higher levels (e.g., 0.6%) in titanomagnetite of Hongge. This supports the earlier work of Zhang [77] who had shown that the volatiles are present in the crystal structure of the minerals as fluid inclusions and they are released from the mineral in substantial quantities at 400…”

Section: An Overview Of Petrogenetic Evolution Of Cmuc and The Associsupporting

confidence: 90%

Mineralogy, geochemistry and petrogenesis of the V-Ti-bearing and chromiferous magnetite deposits hosted by Neoarchaean Channagiri Mafic-Ultramafic Complex, Western Dharwar Craton, India: Implications for emplacement in differentiated pulses

et al. 2014

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The Channagiri Mafic-Ultramafic Complex occupies lowermost section of the Neoarchaean Shimoga supracrustal group in the Western Dharwar Craton. It is a segmented body occupying the interdomal troughs of granitoids. The magnetite deposits occur in the northeastern portion; typically occupying the interface zone between gabbro and anorthositic. Mineralogically, the deposits are simple with abundant magnetite and ilmenite. Hogbomite is a consistent minor mineral. Magnetites are typically vanadiferous (0.7–1.25% V2O5). Ilmenite consistently analyses more MgO and MnO than coexisting magnetite. Chlorite, almost the only silicate present; lies in the range of ripidolite, corundophilite and sheridanite. The chromiferous suit occupying eastern side of Hanumalapur block (HPB) contains Fe-Cr-oxide analysing 37.8–11.9% Cr2O3 and 40.5–80% FeOt. In these too, chlorite, typically chromiferous (0.6–1.2% Cr2O3), is the most dominant silicate mineral. Geochemistry of V-Ti-magnetite is dominated by Fe, Ti and V with Al, Si, Mg and Mn contributing most of the remaining. Cr, Ni, Zn, Co, Cu, Ga and Sc dominate trace element geochemistry. The Cr-magnetite is high in Cr2O3 and PGE. Two separate cycles of mafic magmatism are distinguished in the CMUC. The first phase of first cycle, viz., melagabbro-gabbro, emplaced in the southeastern portion, is devoid of magnetite deposits. The second phase, an evolved ferrogabbroic magma emplaced in differentiated pulses, occupying northeastern portion of the complex, consists of melagabbro→gabbro-anorthosite→V-Ti magnetite→ferrogabbro sequence. Increase in oxygen fugacity facilitated deposition of V-Ti magnetite from ferrogabbroic magma pulse emplaced in late stages. The second cycle of chromiferous PGE mineralized suite comprises fine-grained ultramafite→alternation of pyroxinite-picrite→Crmagnetite sequence formed from fractionation of ferropicritic magma. HPB also includes >65m thick sill-like dioritic phase at the base of the ferriferous suit and a sinuous band of coarse-grained ultramafite enclosed within the chromiferous suit; both unrelated to the two mafic magmatic cycles.

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Section: An Overview Of Petrogenetic Evolution Of Cmuc and The Associsupporting

confidence: 90%

Mineralogy, geochemistry and petrogenesis of the V-Ti-bearing and chromiferous magnetite deposits hosted by Neoarchaean Channagiri Mafic-Ultramafic Complex, Western Dharwar Craton, India: Implications for emplacement in differentiated pulses

et al. 2014

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“…13) further confirm the contribution of recycled UCC material in the mantle source (Jackson et al, 2007). The recycled UCC material was most likely originated from subduction of terrigenous sediments along with the Pacific plate, which can melt in the mantle transition zone, mix with the Low-F melt and metasomatize the overlying asthenosphere (Zhang et al, 2007;Kuritani et al, 2011). It should be noted that although recycled UCC material can be identified in the mantle source, this material is not the actual cause for the incompatible element enrichment in the SE China basalts.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Elemental and Sr–Nd–Pb isotope geochemistry of the Cenozoic basalts in Southeast China: Insights into their mantle sources and melting processes

Sun

Niu

Guo

et al. 2017

Lithos

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Abstract. We analyzed whole-rock major and trace elements and Sr-Nd-Pb isotopes substantiates the presence of recycled upper continental crustal material in the mantle sources of these basalts. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTPb isotope ratios also exhibit spatial variation, increasing from the interior to the coastal area. The significant correlations of major element abundances with Pb isotope ratios indicate that the Pb isotope variations also result from varied extent and A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTPage 3 pressure of decompression melting. We conclude that the elevated Pb isotope ratios from the interior to coast are consistent with increasing extent of decompression melting of the incompatible element depleted mantle matrix, which hosts enriched Pb isotope compositions.

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“…The volatiles that are released at middle-temperature stage (400-800C) represent fluid inclusions that are trapped at edges or healed fractures of recrystallizing minerals. The volatiles that are released at low-temperature stage (200-400C) are mainly the fluid inclusions incorporated in mineral fractures or cleavages [23][24][25][26]. Therefore, the volatiles that are released at 400-800 and 800-1200C may represent primary volatile compositions of the minerals and reflect "primary" fluid environment under which minerals crystallized.…”

Section: Analytical Resultsmentioning

confidence: 99%

“…All analyses were performed at the Lanzhou Center for Oil and Gas Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences. Detailed experimental procedures are described by Zhang et al [23].…”

Section: Methodsmentioning

confidence: 99%

“…The condensed gases were then thawed to collect volatiles except for H 2 O, which was collected separately by a cold trap with alcohol-liquid N 2 mixture. The cold trap with liquid N 2 can prevent released gases from reactions at high temperature [23]. All volatiles but H 2 O were then introduced to a MAT-271 mass spectrometer to determine compositions and contents.…”

Section: Volatile Compositionsmentioning

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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Chemical and stable isotopic constraints on the nature and origin of volatiles in the sub-continental lithospheric mantle beneath eastern China

Cited by 41 publications

References 40 publications

Mineralogy, geochemistry and petrogenesis of the V-Ti-bearing and chromiferous magnetite deposits hosted by Neoarchaean Channagiri Mafic-Ultramafic Complex, Western Dharwar Craton, India: Implications for emplacement in differentiated pulses

Mineralogy, geochemistry and petrogenesis of the V-Ti-bearing and chromiferous magnetite deposits hosted by Neoarchaean Channagiri Mafic-Ultramafic Complex, Western Dharwar Craton, India: Implications for emplacement in differentiated pulses

Elemental and Sr–Nd–Pb isotope geochemistry of the Cenozoic basalts in Southeast China: Insights into their mantle sources and melting processes

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

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