Using Multiphase Solid Inclusions to Constrain the Origin of the Baima Fe‐Ti‐(V) Oxide Deposit, SW China

Li, Pingping; Zhou, Mei‐Fu; Chen, Wei-Terry; Boone, Matthieu; Cnudde, Veerle

doi:10.1111/1755-6724.12308_35

Cited by 6 publications

(9 citation statements)

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“…This process was denoted as ''oxy-exsolution'' by Buddington & Lindsley (1964). The oxygen source is related to the reduction of coexisting silicate minerals and interstitial or trapped residual fluids , Pang et al 2008, Liu et al 2014. The total amount of fluid is probably small relative to the Fe-Ti oxides in the bulk compositions of the whole rocks, however, the low proportion of fluids could cause large variations in f O 2 on cooling (Buddington & Lindsley 1964).…”

Section: Exsolution-oxidation Of Ulvöspinelmentioning

confidence: 99%

Mineralogy and Origin of Exsolution In Ti-Rich Magnetite From Different Magmatic Fe-Ti Oxide-Bearing Intrusions

Tan

Liu

et al. 2016

Can Mineral

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Titanium-rich magnetite from different magmatic Fe-Ti oxide-bearing intrusions consists of host magnetite (nearly pure Fe 3 O 4 ) and different types of exsolution. The exsolution of Ti-rich magnetite is indicative of the physical and chemical conditions at which the host intrusions formed. However, the mechanisms to form these types of exsolution have been debated. To examine the formation mechanisms of the different types of exsolution, multiple microanalytical techniques, such as electron microprobe analysis, micro Raman spectroscopy, and micro X-ray diffraction, were used to examine the chemical composition, morphology, and crystalline structure of exsolved minerals in Ti-rich magnetite from different Fe-Ti oxidebearing intrusions in China. The characterization results indicate that pleonaste and ilmenite are the two dominant exsolution phases in the Ti-rich magnetite, whereas the ulvöspinel phase is barely found. The ilmenite exsolution may have different origins: (1) the cloth-texture lamellae primarily exsolved as ulvöspinel, which was oxidized to ilmenite later at ,600 8C; (2) most of the trellis-and sandwich-type lamellae formed by ''oxy-exsolution'' at .600 8C; (3) some ilmenite lamellae exsolved directly from cation-deficient solid solution due to the substitution of Ti 4þ þ A 2Fe 2þ ; (4) sub-solidus re-equilibration of coexisting Fe-Ti oxides can also lead to ilmenite exsolution in Ti-rich magnetite and magnetite exsolution in ilmenite.

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Section: Exsolution-oxidation Of Ulvöspinelmentioning

confidence: 99%

Mineralogy and Origin of Exsolution In Ti-Rich Magnetite From Different Magmatic Fe-Ti Oxide-Bearing Intrusions

Tan

Liu

et al. 2016

Can Mineral

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“…A closely related computer technique, FitPitch (developed by Aerden, 2003), allowed calculation of preferred orientations of internal foliations (inclusion trails) from pitch and strike measurements collected in sets of differently oriented thin sections. HRXCT has already been widely used for 3-D visualization of igneous (e.g., Jerram et al, 2009), metamorphic (e.g., Huddlestone-Holmes and Ketcham, 2010), and ore minerals (Barnes et al, 2008;Liu et al, 2014). Our HRXCT data illuminate the complete internal architecture of metamorphic fabrics and minerals in a drill core sample.…”

Section: Discussionmentioning

confidence: 96%

High-resolution X-ray computed microtomography: A holistic approach to metamorphic fabric analyses

Sayab

Suuronen

Hölttä

et al. 2015

Geology

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An intrinsic limitation of studying microstructures in thin section is that their spatial (three-dimensional, 3-D) distribution, shape, and orientation have to be inferred by combining 2-D data from different sections. This procedure always involves some degree of interpretation that in some cases can be ambiguous. Recent advances in high-resolution X-ray computed microtomography have made possible the direct imaging in 3-D of volumes of rock to centimeter scale. This rapidly evolving technology is nondestructive and provides a holistic approach of microstructural analysis that eliminates interpretative procedures associated with 2-D methods. Spatial images can be generated through any part of the rock sample and used as virtual petrographic sections. Our application of this technique to an oriented drill core sample from the classic Orijärvi metamorphic region of southern Finland reveals a number of in situ 3-D aspects, including: (1) the spatial distribution and shape of andalusite porphyroblasts, (2) the geometry of a matrix foliation anastomosing around the porphyroblasts, (3) a millimeter-scale compositional layering that controlled the oscillation of porphyroblasts and sulfide mineralization, and (4) distinct inclusion trail patterns characterizing porphyroblast core versus rim zones. The combined data indicate that the steeply dipping bedding-subparallel foliation that characterizes the Orijärvi area formed by bulk north-south crustal shortening and associated vertical stretching.

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“…A C C E P T E D M A N U S C R I P T droplets in the groundmass of basalts or distinct melt inclusions in silicates and apatite from plutonic rocks at the microscale (Charlier et al, 2011;Fischer et al, 2016;Liu et al, 2014;Veksler et al, 2007) which are absent in Wajilitag and Puchang. Thus, the formation of the Wajilitag and Puchang oxide deposits cannot be ascribed directly to the existence of an immiscible Fe-rich magma, and alternative mechanisms involving crystal fractionation with sinking and sorting of dense Fe-Ti oxide crystals must be invoked.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…This ore type is particularly abundant in the Emeishan LIP and ore-forming processes have been intensively debated. Two radically different hypotheses are proposed: 1crystallization of a distinct Fe-Ti±P rich immiscible liquid segregated from the evolved basaltic magma (Liu et al, 2014 and references therein), and (2) early crystallization and gravitational accumulation of the Fe-Ti-V oxide crystals from the ferrobasaltic or ferropicritic parental magmas (Pang et al, 2008a(Pang et al, , 2008bZhang et al, 2009). In the latter genetic model, some fundamentally different formation processes, including frequent Fe-Ti-enriched magma replenishment in a complex magma plumbing system (Bai et al, 2012;Song et al, 2013) and change in water, pressure and oxygen fugacity (ƒO 2 ) conditions…”

Section: Introductionmentioning

confidence: 99%

Petrogenesis and metallogenesis of the Wajilitag and Puchang Fe-Ti oxide-rich intrusive complexes, northwestern Tarim Large Igneous Province

Zhang

Huang

et al. 2018

Lithos

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The Wajilitag and Puchang intrusive complexes of the Tarim large igneous province (TLIP) are associated with significant resources of Fe-Ti oxide ores. These two mafic-ultramafic intrusions show differences in lithology and mineral chemistry. Clinopyroxenite and melagabbro are the dominant rock types in the Wajilitag complex, whereas the Puchang complex is generally gabbroic and anorthositic in composition with minor plagioclase-bearing ACCEPTED MANUSCRIPT chamber to the underlying unconsolidated silicate crystal pile. The highly dense Fe-Ti oxide crystal slurries further tended to effective accumulate Fe-Ti oxides to form high-grade Fe-Ti oxide ore bodies, and subsequent rapid collapse and intrusive into lower lithologies within the complex under a H 2 O-rich environment during the late-stage of magmatic differentiation. The development of massive Fe-Ti oxide ores in the case of the Puchang, could plausibly result from a combination of the protracted differentiation history of a Fe highly enriched parental magma and the later addition of external H 2 O from the country rocks (e.g., carbonates) to the slowly cooling magma chamber.

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Using Multiphase Solid Inclusions to Constrain the Origin of the Baima Fe‐Ti‐(V) Oxide Deposit, SW China

Cited by 6 publications

References 0 publications

Mineralogy and Origin of Exsolution In Ti-Rich Magnetite From Different Magmatic Fe-Ti Oxide-Bearing Intrusions

Mineralogy and Origin of Exsolution In Ti-Rich Magnetite From Different Magmatic Fe-Ti Oxide-Bearing Intrusions

High-resolution X-ray computed microtomography: A holistic approach to metamorphic fabric analyses

Petrogenesis and metallogenesis of the Wajilitag and Puchang Fe-Ti oxide-rich intrusive complexes, northwestern Tarim Large Igneous Province

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