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https://hdl.handle.net/2440/118285
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dc.contributor.author | Gao, W. | - |
dc.contributor.author | Ciobanu, C.L. | - |
dc.contributor.author | Cook, N.J. | - |
dc.contributor.author | Slattery, A. | - |
dc.contributor.author | Huang, F. | - |
dc.contributor.author | Wang, D. | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | American Mineralogist: an international journal of earth and planetary materials, 2019; 104(2):244-261 | - |
dc.identifier.issn | 0003-004X | - |
dc.identifier.issn | 1945-3027 | - |
dc.identifier.uri | http://hdl.handle.net/2440/118285 | - |
dc.description.abstract | Pyroxene exsolutions and associated Fe–Ti oxides and spinels are described in a sample of olivine gabbro representing the Middle Zone of the Panzhihua layered intrusion, Southwest China, part of the Emeishan LIP. High-angle annular dark-field scanning transmission electron microscope imaging, electron diffraction, and energy dispersive spectroscopy reveal complex multi-stage exsolution relationships in the host clinopyroxene. The studied assemblage is common in gabbroic rocks and comprises subcalcic diopside and lamellar clinoenstatite (<1 wt% Ca). Two sets of exsolved clinopyroxene lamellae are observed. Only one is, however, well developed as lamellae oriented approximately parallel to (801) of diopside, making an angle of ~10 to 11° with the (100) planes, or the c axis, of both phases. These are the so-called “100” lamellae with a perfect fit along a-crystallographic axes when viewed down to [010] zone axis. Crosscutting exsolutions of Fe–(Ti) oxides are relatively common throughout the same host clinopyroxene. Apart from ilmenite and magnetite with variable Ti-content, hercynite is a minor yet ubiquitous phase. The nanoscale study indicates a sequence of fine-scale processes: from higher-T (~1030–1100 °C): (I) (clino)enstatite exsolutions in low-Ca diopside; followed by (II) slightly Ca-richer diopside overgrowths and high-T titanomagnetite exsolution in diopside; to lower-T (<450 °C) (III) titanomagnetite exsolutions into ulvöspinel + magnetite; followed by (IV) sub-solidus re-equilibration in clinopyroxenes and among Fe–Ti oxides + hercynite. Using exact phase boundary theory, pressures of lamellar exsolution within the host diopside are estimated as ~2 GPa with an error of ± ≤1 GPa. The present study of complex exsolutions in clinopyroxene demonstrates that a nanoscale approach can help constrain P-T-X evolution during formation of layered intrusions. | - |
dc.description.statementofresponsibility | Wenyuan Gao, Cristiana L. Ciobanu, Nigel J. Cook, Ashley Slattery, Fei Huang, and Daoheng Wang | - |
dc.language.iso | en | - |
dc.publisher | Mineralogical Society of America | - |
dc.rights | © 2019 by the Mineralogical Society of America | - |
dc.source.uri | http://dx.doi.org/10.2138/am-2019-6764 | - |
dc.subject | High-angle annular dark-field scanning transmission electron microscopy; clinopyroxene; titanomagnetite; liquid-magmatic ore deposits; sequence of exsolution | - |
dc.title | Nanoscale study of lamellar exsolutions in clinopyroxene from olivine gabbro: recording crystallization sequences in iron-rich layered intrusions | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.2138/am-2019-6764 | - |
dc.relation.grant | ARC | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Cook, N.J. [0000-0002-7470-3935] | - |
dc.identifier.orcid | Slattery, A. [0000-0003-4023-3506] | - |
Appears in Collections: | Aurora harvest 8 Chemical Engineering publications |
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