Multiple metasomatism in Sulu ultrahigh-P garnet peridotite constrained by petrological and geochemical investigations

The pre‐pilot hole (PP1) of the Chinese Continental Scientific Drilling Project (CCSD) recovered drill core samples from a 118 m‐thick section of peridotites located at Zhimafang in the southern Sulu UHP terrane, China. The peridotites consist of phlogopite‐bearing garnet lherzolite, harzburgite, we...

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Bibliographic Details
Published in:Journal of metamorphic geology 2007-02, Vol.25 (2), p.149-164
Main Authors: ZHANG, R. Y., LI, T., RUMBLE, D., YUI, T-F, LI, L., YANG, J. S., PAN, Y, LIOU, J. G.
Format: Article
Language:English
Subjects:
carbonate
Drilling
garnet peridotite
Geochemistry
Isotopes
metasomatism
Minerals
Petrology
pre-pilot hole
stable isotope
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Summary:The pre‐pilot hole (PP1) of the Chinese Continental Scientific Drilling Project (CCSD) recovered drill core samples from a 118 m‐thick section of peridotites located at Zhimafang in the southern Sulu UHP terrane, China. The peridotites consist of phlogopite‐bearing garnet lherzolite, harzburgite, wehrlite and dunite. Some peridotite layers contain magnesite and Ti‐clinohumite, and are characterized by LREE and LILE enrichment and HFSE depletion. Phlogopite (Phl) occurs in the peridotite matrix and is LILE‐enriched with low Zr/Hf ratios (0.19–0.60). Phlogopite shows a mantle signature in H and O isotopes (δ18O: +5.4‰ to +5.9‰, and δD: −76‰ to −91‰). Ti‐clinohumite (Ti‐Chu) is Nb and Ta‐enriched and has higher Ti and HREE concentrations than phlogopite. Magnesite (Mgs) occurs as megacrysts, as a matrix phase, and as veins (±Phl ± Ti‐Chu), and contains low REEtotal contents (
ISSN:0263-4929
1525-1314
DOI:10.1111/j.1525-1314.2006.00683.x