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Journal of Zhejiang University SCIENCE A 2004 Vol.5 No.10 P.1180-1182


Discovery of ultrahigh-T spinel garnet granulite with pure CO2 fluid inclusions from the Altay orogenic belt, NW China

Author(s):  LI Zi-long, CHEN Han-lin, Santosh M., YANG Shu-feng

Affiliation(s):  Department of Earth Sciences, College of Science, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   zilongli@hotmail.com, hlchen@zju.edu.cn

Key Words:  UHT granulite, Petrology, Pure CO2 fluid inclusion, Altay orogenic belt, NW China

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LI Zi-long, CHEN Han-lin, Santosh M., YANG Shu-feng. Discovery of ultrahigh-T spinel garnet granulite with pure CO2 fluid inclusions from the Altay orogenic belt, NW China[J]. Journal of Zhejiang University Science A, 2004, 5(10): 1180-1182.

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author="LI Zi-long, CHEN Han-lin, Santosh M., YANG Shu-feng",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Discovery of ultrahigh-T spinel garnet granulite with pure CO2 fluid inclusions from the Altay orogenic belt, NW China
%A LI Zi-long
%A CHEN Han-lin
%A Santosh M.
%A YANG Shu-feng
%J Journal of Zhejiang University SCIENCE A
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%N 10
%P 1180-1182
%@ 1869-1951
%D 2004
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2004.1180

T1 - Discovery of ultrahigh-T spinel garnet granulite with pure CO2 fluid inclusions from the Altay orogenic belt, NW China
A1 - LI Zi-long
A1 - CHEN Han-lin
A1 - Santosh M.
A1 - YANG Shu-feng
J0 - Journal of Zhejiang University Science A
VL - 5
IS - 10
SP - 1180
EP - 1182
%@ 1869-1951
Y1 - 2004
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.2004.1180

We first report discovery of the spinel-garnet-orthopyroxene granulite with pure CO2 fluid inclusions from the Fuyun region of the late Paleozoic altay orogenic belt in Central Asia, NW China. The rock is characterized by an assemblage of garnet, orthopyroxene, spinel, cordierite, biotite, plagioclase and quartz. Symplectites of orthopyroxene and spinel, and orthopyroxene and cordierite indicate decompression under UHT conditions. Mineral chemistry shows that the orthopyroxenes have high XMg and Al2O3 contents (up to 9.23 wt%). Biotites are enriched in TiO2 and XMg and are stable under granulite facies conditions. The garnet and quartz from the rock carry monophase fluid inclusions which show peak melting temperatures of around −56.7 °C, indicating a pure CO2 species being presented during the ultrahigh-T metamorphism in the altay orogenic belt. The inclusions homogenize into a liquid phase at temperatures around 15.3–23.8 °C translating into CO2 densities of the order of 0.86–0.88 g/cm3. Based on preliminary mineral paragenesis, reaction textures and petrogenetic grid considerations, we infer that the rock was subjected to UHT conditions. The CO2-rich fluids were trapped during exhumation along a clockwise P-T path following isothermal decompression under UHT conditions.

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