2018
DOI: 10.1111/1755-6724.13547
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Petrological and Geochemical Constraints on the Protoliths of Serpentine‐Magnetite Ores in the Zhaoanzhuang Iron Deposit, Southern North China Craton

Abstract: The uncommon Mg-rich and Ti-poor Zhaoanzhuang serpentine-magnetite ores within Taihua Group of the North China Craton (NCC) remain unclear whether the protolith was sourced from ultramafic rocks or chemical sedimentary sequences. Here we present integrated petrographic and geochemical studies to characterize the protoliths and to gain insights on the ore-forming processes. Iron ores mainly contain low-Ti magnetite (TiO 2 ~0.1wt%) and serpentine (Mg # =92.42-96.55), as well as residual olivine (Fo=89-90), ortho… Show more

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(5 citation statements)
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“…The high-Mg serpentine in the ore is believed to be the retrograde metamorphic product of high-Mg olivine (Fo = 89−90) and orthopyroxene (En = 89−90) [1], which is supported by the presence of minor amounts of residual olivine and orthopyroxene. The magnetite-poor wall rocks adjacent to the ores characteristically contain various magnesium-rich silicate minerals, including olivine (Fo = 83−87), orthopyroxene (En = 82−86), hornblende (X Mg = 0.87−0.96), and humite (Mg # = 82−84), which coexist with lesser amounts of anhydrite, dolomite, and apatite [1]. In addition, several layers of tourmaline-rich rock are interlayered with the iron ores and the magnetite-poor wall rocks.…”
Section: Introductionmentioning
confidence: 99%
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“…The high-Mg serpentine in the ore is believed to be the retrograde metamorphic product of high-Mg olivine (Fo = 89−90) and orthopyroxene (En = 89−90) [1], which is supported by the presence of minor amounts of residual olivine and orthopyroxene. The magnetite-poor wall rocks adjacent to the ores characteristically contain various magnesium-rich silicate minerals, including olivine (Fo = 83−87), orthopyroxene (En = 82−86), hornblende (X Mg = 0.87−0.96), and humite (Mg # = 82−84), which coexist with lesser amounts of anhydrite, dolomite, and apatite [1]. In addition, several layers of tourmaline-rich rock are interlayered with the iron ores and the magnetite-poor wall rocks.…”
Section: Introductionmentioning
confidence: 99%
“…The Zhaoanzhuang iron deposit in the southern North China Craton (Figure 1) consists of abundant uncommon serpentine-magnetite ores, with an ore reserve more than 130 Mt (≥40% Fe). The ore is composed of low-Ti magnetite (TiO 2~0 .1%), high-Mg serpentine (Mg # = 92.42−96.55), and minor amounts of dolomite, apatite, anhydrite, and gypsum [1]. The high-Mg serpentine in the ore is believed to be the retrograde metamorphic product of high-Mg olivine (Fo = 89−90) and orthopyroxene (En = 89−90) [1], which is supported by the presence of minor amounts of residual olivine and orthopyroxene.…”
Section: Introductionmentioning
confidence: 99%
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