Sulfide-melt inclusions in mantle xenoliths of Hannuoba, China

Xu, Jintao; Chu, Xuelei; Zhou, Yiming; Du, Yuanfu

doi:10.1007/bf02884744

Cited by 5 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most previous studies of SMIs have focused on melt inclusions in phenocrysts in volcanic rocks (e.g. Nielsen et al, 1995;Kamenetsky & Clocchiatti, 1996;Kamenetsky et al, 1997;Xu et al, 1999;Norman et al, 2002;Bertagnini et al, 2003;Cervantes & Wallace, 2003;Danyushevsky et al, 2003;Maclennan et al, 2003;Schiano, 2003;Schiano et al, 2004). Here we present data on SMIs within the constituent minerals of cumulate xenoliths derived by fragmentation of a magma body that crystallized slowly near the Moho.…”

mentioning

confidence: 91%

Evolution of Mafic Alkaline Melts Crystallized in the Uppermost Lithospheric Mantle: a Melt Inclusion Study of Olivine-Clinopyroxenite Xenoliths, Northern Hungary

Zajacz¹,

Kovàcs²,

Szabó³

et al. 2007

Journal of Petrology

View full text Add to dashboard Cite

mentioning

confidence: 91%

Evolution of Mafic Alkaline Melts Crystallized in the Uppermost Lithospheric Mantle: a Melt Inclusion Study of Olivine-Clinopyroxenite Xenoliths, Northern Hungary

Zajacz¹,

Kovàcs²,

Szabó³

et al. 2007

Journal of Petrology

View full text Add to dashboard Cite

“…Pyrrhotite is the most significant magnetic Fe-sulfide in the deep-seated xenoliths [Wasilewski et al, 1979]. It always occurs as large discrete elliptical inclusions (10-100 μm) in pyroxene or olivine in the mantle xenoliths [Zajacz and Szabó, 2003;Xu et al, 2005] and could be formed during the crystallization or cooling of the pyroxene [Xu et al, 1999]. Pyrrhotite contributes little to the bulk magnetic moment due to its large multidomain (MD) grain size [Ebert et al, 2010].…”

Section: Magnetic Mineralogy Of the Pyroxenite Xenolithsmentioning

confidence: 99%

Magnetic mineralogy of pyroxenite xenoliths from Hannuoba basalts, northern North China Craton: Implications for magnetism in the continental lower crust

Zheng

Zeng

et al. 2014

J. Geophys. Res. Solid Earth

View full text Add to dashboard Cite

Studies of the petrology, mineral chemistry, and rock magnetic properties of nine pyroxenite xenoliths from Hannuoba basalts, northern North China Craton, have been made to determine the magnetization signature of the continental lower crust. These pyroxenites are weakly magnetic with low average susceptibility (χ) and saturation isothermal remanent magnetization (M rs ) of 39.59 × 10 À8 m 3 kg À1and 12.05 × 10 À3 Am 2 kg À1 , respectively. The magnetic minerals are mainly magnetite, pyrrhotite, and Fe-rich spinel, which significantly contribute to χ and natural remanent magnetization. Magnetite occurs as interstitial microcrystals together with zeolite aggregates, indicating a secondary origin in a supergene environment. In contrast, pyrrhotite and Fe-rich spinel were formed prior to the xenoliths' ascent to the surface, as evidenced by their dominant occurrence as tiny inclusions and thin exsolution lamellae in pyroxene. The Fe-rich spinel has~50% mole fraction of Fe 3 O 4 and corresponds to the strongest magnetization, and its coexistence with Mg-rich spinel implies a reheating event due to the underplating of basaltic magma. Besides, armalcolite and ilmenite were found in the reaction rims between xenoliths and the basalt, but they contribute little to the whole rock magnetization. However, these pyroxenite xenoliths would be nonmagnetic at in situ depths, as well as peridotite and mafic granulite xenoliths derived from the crust-mantle transition zone (~32-42 km). Therefore, we suggest the limiting depth of magnetization at the boundary between weakly magnetic deep-seated (lower crust and upper mantle) xenoliths and strongly magnetic Archean granulite facies rocks (~32 km) in Hannuoba, northern North China Craton.

show abstract

“…We have determined gold content of 85 sulfides in mantle-derived xenoliths of the above-mentioned districts by electron microprobe analysis, and along with the literature data [18,21] , we have listed in Table 2 the characteristics of element compositions of 130 sulfides .…”

Section: Sulfide Assemblages In Mantle Xenolithsmentioning

confidence: 99%

Gold contents of both mantle-derived xenoliths and sulfides in them from eastern China

Yue

2008

Sci. China Ser. D-Earth Sci.

View full text Add to dashboard Cite

The gold contents of 59 samples of mantle-derived xenoliths, along with 85 samples of sulfide assemblages in them, of Cenozoic basalt from eight districts in eastern China are analyzed. The gold contents of mantle xenoliths usually fall in the range of 10 −9 -10 −8 , whereas those of the sulfide assemblages fall in the range of 10 −4 -10 −2 . This implies that the latter are several hundred thousand times higher than the former, and thus that Au in the mantle is concentrated mostly in sulfide assemblages. Gold contents of both mantle-derived xenoliths and sulfide assemblages in them are inhomogeneous spatially, but their distribution rules are similar. Except the samples from Hainan Province, either the mantle xenoliths with high gold content or sulfide assemblages of the mantle-derived xenoliths with high gold content are distributed mostly on the north and south margins of the North China platform (Hannuoba of Hebei Province and Linqu, Changle of Shandong Province), corresponding to districts with concentrated gold deposits in northwest Hebei Province and Jiaodong Peninsula of Shandong Province. This may reflect the correlativity in age, nature and composition between the continental crust and the underlying lithospheric mantle. The underlying lithospheric mantle of the North China platform is an ancient gold-rich lithospheric mantle. The gold-rich lithospheric mantle may be the material source of later activation, enrichment, transportation and mineralization of gold by auriferous CO 2 mantle fluids. mantle xenolith, sulfide, gold content, gold deposits-concentrated districts

show abstract

Sulfide-melt inclusions in mantle xenoliths of Hannuoba, China

Cited by 5 publications

References 1 publication

Evolution of Mafic Alkaline Melts Crystallized in the Uppermost Lithospheric Mantle: a Melt Inclusion Study of Olivine-Clinopyroxenite Xenoliths, Northern Hungary

Evolution of Mafic Alkaline Melts Crystallized in the Uppermost Lithospheric Mantle: a Melt Inclusion Study of Olivine-Clinopyroxenite Xenoliths, Northern Hungary

Magnetic mineralogy of pyroxenite xenoliths from Hannuoba basalts, northern North China Craton: Implications for magnetism in the continental lower crust

Gold contents of both mantle-derived xenoliths and sulfides in them from eastern China

Contact Info

Product

Resources

About