High-pressure metamorphism of serpentinized chromitite at Luobusha (southern Tibet)

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ID: 302381
2014
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Abstract
Podiform chromitite with a dunite envelope occurs in harzburgite in the Luobusha ophiolite in the Yarlung-Zangbo suture zone, Tibet, SW China. The chromite and olivine grains come in two main forms in the chromitite: larger spherically-shaped (nodular), and dispersed (disseminated) smaller-grains. The nodular chromite and olivine grains, and their "melt inclusions," indicate that their formation was via a magmatic process, most likely in the upper mantle. The disseminated chromite and olivine are fragments of the nodular grains that were recrystallized in a metamorphic process. In contrast to the magmatic grains, these metamorphic (that is non-magmatic) chromite and olivine grains are characterized by the presence of inclusions of lizardite, brucite, chlorite, talc, actinolite, uvarovitic garnet, and magnetite. This occurrence suggests that the high-pressure metamorphism was not coeval with the chromitite formation but occurred later as an independent event, with chromitite formation and high-pressure metamorphism separated by passage to near-surface conditions. There, lizardite grew, now occurring as inclusions in the preserved high-pressure metamorphic minerals. Serpentinization took place in the shallow crust, prior to the high-pressure metamorphism.
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openalex_W2323173515 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Meng-Xi Huang, Jianjun Yang, Roger Powell, X. Mo
Journal american journal of science
Year 2014
DOI
10.2475/01.2014.11
URL
https://ajs.scholasticahq.com/article/60902.pdf
Keywords Keywords not found

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