Oscillatory Sr isotopic signature in plagioclase megacrysts from the Damiao anorthosite complex, North China: Implication for petrogenesis of massif-type anorthosite

Chen, Wei Terry; Zhou, Mei‐Fu; Gao, Jianfeng; Zhao, Taiping

doi:10.1016/j.chemgeo.2014.11.008

Cited by 24 publications

(6 citation statements)

References 55 publications

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“…Fortunately, the analytical precision and accuracy of Sr isotopes obtained by LA-MC-ICP-MS can meet geological requirements of isotopic variations even recorded in a megacryst from center to rim. 10,16 The ubiquitous occurrence of Sr-rich minerals concomitant with low Rb content due to the geochemical resemblance of Sr with major element Ca makes minerals such as plagioclase, apatite, and clinopyroxene particularly suitable for in situ Sr isotopic analysis. 14,15,17–20 Successful cases indicate that plagioclase is one of the most important index minerals, which grows over a large range of magma compositions, from basaltic to rhyolitic, characterized by low Rb/Sr and high Sr contents, and is widely used in in situ Sr isotopic compositions to reveal magma evolution.…”

Section: Introductionmentioning

confidence: 99%

A natural plagioclase reference material for microbeam Sr isotopic analysis

Yang

Wang

et al. 2022

J. Anal. At. Spectrom.

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Section: Introductionmentioning

confidence: 99%

A natural plagioclase reference material for microbeam Sr isotopic analysis

Yang

Wang

et al. 2022

J. Anal. At. Spectrom.

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“…The ~1.74 Ga Damiao anorthosite complex in northern part of the North China Craton hosts more than 130 Fe-Ti-P ore bodies, as pods, lenses, veins and dykes or stockworks, up to tens of meters wide (Chen et al, 2015b). These orebodies are mainly hosted in anorthosite…”

Section: Methodsmentioning

confidence: 99%

“…and leuconorite with sharp contacts and also in melanorites with gradational contacts (Chen et al, 2015b). Magnetites from two Fe-Ti-P ores have obviously different Ge contents, with Ge ranges from 1.36 to 4.48 ppm and from 14.8 to 26.6 ppm ( Fig.…”

Section: Methodsmentioning

confidence: 99%

Germanium in Magnetite: A Preliminary Review

Meng

Huang

et al. 2017

Acta Geologica Sinica (Eng)

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Magnetite is a very common mineral in various types of iron deposits and some sulfide deposits. Recent studies have focused on the use of trace elements in magnetite to discriminate ore types or trace ore‐forming process. Germanium is a disperse element in the crust, but sometimes is not rare in magnetite. Germanium in magnetite can be determined by laser ablation ICP‐MS due to its low detection limit (0.0X ppm). In this study, we summary the Ge data of magnetite from magmatic deposits, iron formations, skarn deposits, iron oxide copper‐gold deposits, and igneous derived hydrothermal deposits. Magnetite from iron formations contains relatively high Ge (up to ∼250 ppm), whereas those from all other deposits mostly contains Ge less than 10 ppm, indicating that iron formations can be discriminated from other Fe deposits by Ge contents. Germanium in magmatic/hydrothermal magnetite is controlled by a few factors. Primary magma/fluid composition may be the major control of Ge in magnetite. Higher oxygen fugacity may be beneficial to Ge partition into magnetite. Sulfur fugacity and temperature may have little effect on Ge in magnetite. The enrichment mechanism of Ge in magnetite from iron formations remains unknown due to the complex ore genesis. Germanium along with other elements (Mn, Ni, Ga) and element ratios (Ge/Ga and Ge/Si raios) can distinguish different types of deposits, indicating that Ge can be used as a discriminate factor like Ti and V. Because of the availability of in situ analytical technique like laser ablation ICP‐MS, in situ Ge/Si ratio of magnetite can serve as a geochemical tracer and may provide new constraints on the genesis of banded iron formations.

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“…However, anorthosite layers displaying conformable contact with other gabbroic layers is a unique lithology recognized in this study, which distinguishes the Niumaoquan layered gabbroic intrusion from other maficultramafic intrusions that host Ni-Cu sulfide deposits in the Eastern Tianshan district. Anorthosite is an important gabbroic phase in mafic-ultramafic intrusions associated with Fe-Ti oxide deposits Chen et al, 2015;Li et al, 2015), and possibly plays an important role in understanding the mineralization of the Niumaoquan Fe -Ti oxide deposit. Therefore, the chronology, mineralogy, petrology, and geochemistry of the Niumaoquan gabbroic intrusion are important for addressing Fe-Ti oxide mineralization style and constructing a metallogenic spectrum related to mantle-derived magma in a postcollision stage.…”

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confidence: 99%

Petrogenesis and Metallogenesis of the Niumaoquan Gabbroic Intrusion Associated with Fe‐Ti Oxide Ores in the Eastern Tianshan, NW China

Shi

Wang

et al. 2018

Acta Geologica Sinica (Eng)

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The Niumaoquan layered gabbroic intrusion is in the southern margin of the Central Asian Orogenic Belt in North Xinjiang, China, and hosts a Fe‐Ti oxide deposit in its evolved gabbroic phases. In this paper, we report zircon U‐Pb age, Sr‐Nd‐Hf isotopes, plagioclase chemistry, and whole‐rock geochemistry of the Niumaoquan layered gabbroic intrusion. Zircon grains separated from an anorthosite sample analyzed by laser ablation inductively coupled plasma mass spectrometry yielded a concordia age of 314.7±0.74 Ma, indicating that the Niumaoquan ore‐bearing gabbroic intrusion was emplaced during the Late Carboniferous. The olivine gabbro texture and plagioclase chemistry suggest that plagioclase was an early crystallized silicate phase that crystallized prior to olivine. Fractional crystallization and accumulation of plagioclase significantly controlled the evolution of the Niumaoquan gabbroic intrusion and contributed to the formation of anorthosite layers, causing metallogenic elements to become enriched in the residual melt. The Niumaoquan gabbroic intrusion is characterized by the enrichment of large ion lithophile elements and depletion of high field strength elements, positive zircon εHf(t) values (+2.1 to +12.2), positive εNd(t) values (+3.3 to +5.2), and low initial 87Sr/86Sr ratios (0.7039 to 0.7047), suggesting that the parental magma was produced by interactions between metasomatized lithospheric mantle and depleted asthenospheric melts at an early post‐collision stage. The Fe‐Ti oxide mineralization of the Niumaoquan intrusion benefited from interactions between depleted asthenospheric melts and lithospheric mantle, and fractional crystallization of abundant plagioclase and magnesian minerals.

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Oscillatory Sr isotopic signature in plagioclase megacrysts from the Damiao anorthosite complex, North China: Implication for petrogenesis of massif-type anorthosite

Cited by 24 publications

References 55 publications

A natural plagioclase reference material for microbeam Sr isotopic analysis

A natural plagioclase reference material for microbeam Sr isotopic analysis

Germanium in Magnetite: A Preliminary Review

Petrogenesis and Metallogenesis of the Niumaoquan Gabbroic Intrusion Associated with Fe‐Ti Oxide Ores in the Eastern Tianshan, NW China

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