Journal article
HIGH-PRESSURE METAMORPHISM of SERPENTINIZED CHROMITITE at LUOBUSHA (SOUTHERN TIBET)
MX Huang, JJ Yang, R Powell, X Mo
American Journal of Science | AMER JOURNAL SCIENCE | Published : 2014
DOI: 10.2475/01.2014.11
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 sphericallyshaped (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 charact..
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Funding Acknowledgements
This is a contribution to the Tribute to Professor Bor-ming Jahn. Hai-Yun Wu and Pu Qiong are thanked for their guidance in the field. Qian Mao, Yu-Guang Ma, and Kosuke Naemura helped with electron microprobe analyses, Jia-Qing Liu and Hao-Ran Zhang with Raman analysis. The critical and constructive reviews by Bernard Evans and an anonymous reviewer, as well as the careful editorial work by Guest Editor Kuo-Lung Wang, helped clarify the issues raised and improved the quality of the manuscript. Financial support was provided by the Natural Science Foundation of China (Nos. 41173042 and 40873025), the Chinese Academy of Sciences (No. XDB03010200), and the Chinese Ministry of Science and Technology (No. 2009CB825001). RP acknowledges support of ARC DP0987731.