The origin of spongy texture in minerals of mantle xenoliths from the Western Qinling, central China

Ben Xun Su, Hong Fu Zhang, Patrick Asamoah Sakyi, Yue Heng Yang, Ji Feng Ying, Yan Jie Tang, Ke Zhang Qin, Yan Xiao, Xin Miao Zhao, Qian Mao, Yu Guang Ma

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

Spongy textures are observed in mantle peridotite xenoliths hosted in Cenozoic kamafugites from the Western Qinling, central China. These textures are mainly developed in clinopyroxenes and spinels, and occur as spongy rims consisting of low-Na clinopyroxene, ilmenite, and bubbles, enclosing nonspongy cores. The ilmenites and bubbles exhibit shapes and sizes that vary with the width of the spongy rims. The spongy-textured minerals preserve primary shapes and well-defined grain boundaries and do not show apparent interaction with contact minerals or observed melts except the subsequent melts forming melt pockets. The xenocrysts display reactive zoning textures with host magmas rather than spongy textures. Compositionally, the spongy rims are enriched in Ca, Ti, and most trace elements, have high Cr#, and are depleted in Na, Al, Fe, AlVI, and AlIV/AlVI compared with the cores. These observations suggest that melts/host magmas did not play any significant role in the formation of the spongy textures. We therefore propose that spongy-textured clinopyroxenes and spinels in Western Qinling peridotite xenoliths developed from a decompression-induced partial melting event prior to formation of melt pockets and xenolith entrainment in host magmas.

Original languageEnglish
Pages (from-to)465-482
Number of pages18
JournalContributions to Mineralogy and Petrology
Volume161
Issue number3
DOIs
Publication statusPublished - Mar 2011

Keywords

  • Decompression
  • Mantle peridotite
  • Partial melting
  • Spongy texture
  • Western Qinling

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