Characteristics of Hydroxyl in Lherzolite from Different Geological Setting
详细信息
- 责任者：Wang Yang (Institute of Geophysics & Geomatics ; China University of Geosciences ; Wuhan 430074 ; China) ; Jin Zhenmin
- 刊名：Earth Science
- 出版年：2013
- 卷期：38(3)
- 关键词：橄榄岩 ; peridotites ; 结构水 ; constitutional water
- 页码：p.489-500
- 图表：illus., 3 tables, 52 refs.
- 分类号：0801
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
摘要
Hydroxyl in minerals from upper mantle peridotite plays an important role in the evolution of the earth’s interior.In order to understand the correlation between geological setting and hydroxyl incorporation in lherzolite,OH contents of 13 garnet/spinel lherzolite samples from different geological settings(i.e.stable craton,reactivated craton,mantle plume,subduction zone and UHP terrane)were investigated by fourier transform infrared(FTIR)spectroscopy analysis.The results demonstrate:(1)water contents in olivine and bulk rock follow the trend of UHP terrain >mantle plumb>stable craton >subduction zone >activated craton;(2)garnet lherzolite contains more water than that of spinel lherzolite for samples from the same geological setting,indicating that the upper mantle should be stratified with depth in terms of water distribution;(3)the presence of [Si] deficiency-caused IR peaks at 3 611-3 613 cm-1 together with the absence of [Fe3+] caused peaks at 3 325 cm-1 and 3 355 cm-1 indicates the upper mantle is more reduced with increasing pressure.
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