NDLI: Sr-rich apatite from the Dangzishan leucitite-ijolite xenoliths (Heilongjiang Province): Mineralogy and mantle-fluid metasomatism

Content Provider	Springer Nature Link
Author	Zhang, WenLan Shao, JiAn Wang, RuCheng Xu, XiSheng Che, XuDong Yang, YueHeng
Copyright Year	2011
Abstract	Abundant apatite grains with elevated SrO content were found in leucitite-ijolite xenoliths in the Dangzi Mountain, Heilongjiang Province. Morphological and mineralogical associations, and compositional analysis of the Sr-rich apatite, were carried out using an electron microprobe. Two principal types of apatite were distinguished. One type occurs as short-prismatic crystals with Sr-rich rims, while another type with acicular or finely columnar shapes constitutes Sr-rich apatite element maps and systematic quantitative analysis of apatite revealed great variations in SrO content (0.42%–26.79%). The calculated structural formula of the measured Sr-rich apatite is: (Ca$_{3.15–4.963}$Sr$_{0.019–1.510}$Ba$_{0.00–0.030}$Na$_{0.006–0.108}$REE$_{0.106–0.153}$) (P$_{2.84–3.028}$Si$_{0.009–0.094}$)O$_{12}$(F$_{0.675–1.079}$, Cl$_{0.000–0.256}$, OH$_{0.084–0.297}$). Mineralogical textures of apatite implied a replacement mechanism for the Sr-rich apatite. Sr-rich rims of apatite are suggested to have formed after metasomatism (isomorphic replacement) of early fluorapatite in a Sr-, light rare-earth elements (LREE), lithophile light elements (LILE)- and volatile-rich residual melt during late magmatism. However, the acicular apatite probably directly crystallized from a Sr-rich residual melt. The Sr-Nd isotopic composition of the apatite was distinctive from that of leucitite-ijolite and its host rock. These differences, combined with mineralogical features of apatite, imply that Sr-LREE-LILE-volatile-rich components in the residual melt were derived from deep in the asthenosphere, and subsequently were enriched at a late stage in magma evolution.
Starting Page	53
Ending Page	63
Page Count	11
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	56
Issue Number	1
e-ISSN	18619541
Language	English
Publisher	SP Science China Press
Publisher Date	2011-02-02
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	Engineering Earth Sciences Chemistry/Food Science Physics Life Sciences Science
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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