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P-T evolution of a spinel plus quartz bearing khondalite from the Highland Complex, Sri Lanka: Implications for non-UHT metamorphism

文献类型：期刊论文

作者Dharmapriya, P. L.1,2; Malaviarachchi, Sanjeewa P. K.1,2; Galli, Andrea3; Su, Ben-Xun4; Subasinghe, N. D.5; Dissanayake, C. B.5; Nimalsiri, T. B.1,5; Zhu, Bin4,6
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2014-12-01
卷号95页码:99-113
关键词Spinel plus quartz assemblage UHT metamorphism Pseudosections Highland Complex Sri Lanka
ISSN号1367-9120
DOI10.1016/j.jseaes.2014.05.003
文献子类Article
英文摘要Here, we report a natural field example for the coexistence of spinel + quartz as a non-UHT assemblage in spinel- and cordierite-bearing garnet-sillimanite-biotite-graphite gneiss (khondalite) interbedded with orthopyroxene-garnet-biotite bearing intermediate granulites from the Highland Complex (HC) in Sri Lanka. The khondalite contains Zn-rich spinel mainly in four textural assemblages namely: (a) spinel co-existing with tiny quartz (ZnO = 12.67-12.85 wt%), (b) spinel surrounded by sillimanite moates and in intergrowth with skeletal sillimanites (ZnO = 9.03-9.17 wt%), (c) symplectitic spinels at the margin of sillimanite (ZnO = 4.09-4.28 wt%) and (d) spinel co-existing with ilmenite or as isolated grains (ZnO = 7.61-7.97 wt% and Cr2O3 = 5.99-6.27 wt%). Assemblage (a) and (b) occur within garnet while assemblages of (c) and (d) are present within cordierite moates after garnet in the matrix. Pseudosections calculated in the NCKFMASHTMnO system and conventional geothermobarometry suggest that the metamorphic peak conditions attained by the spinel + quartz bearing khondalites and associated intermediate granulites did not exceed T of 900 degrees C and P of 7.5-8.5 kbar. Post-peak evolution was characterized by a stage of nearly-isobaric cooling down to T of 770 degrees C and P of 7.5 kbar, followed by a late stage of isothermal decompression down to P < 6.5 kbar and T of 770 degrees C.
WOS关键词ULTRAHIGH-TEMPERATURE METAMORPHISM ; MINERAL EQUILIBRIA CALCULATIONS ; GRANULITE-FACIES METAMORPHISM ; EXTREME CRUSTAL METAMORPHISM ; SILICA-SATURATED PORTION ; LUTZOW-HOLM COMPLEX ; SOUTHERN INDIA ; SAPPHIRINE-BEARING ; HIGH-PRESSURE ; SYSTEM K2O-FEO-MGO-AL2O3-SIO2-H2O-TIO2-FE2O3
WOS研究方向Geology
语种英语
WOS记录号WOS:000346398400008
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Research Council (NRC) of Sri Lanka(NRC-11-180) ; National Research Council (NRC) of Sri Lanka(NRC-11-180) ; National Natural Science Foundation of China(41173011) ; National Natural Science Foundation of China(41173011) ; University of Peradeniya(RG/2012/41/S) ; University of Peradeniya(RG/2012/41/S) ; National Research Council (NRC) of Sri Lanka(NRC-11-180) ; National Research Council (NRC) of Sri Lanka(NRC-11-180) ; National Natural Science Foundation of China(41173011) ; National Natural Science Foundation of China(41173011) ; University of Peradeniya(RG/2012/41/S) ; University of Peradeniya(RG/2012/41/S) ; National Research Council (NRC) of Sri Lanka(NRC-11-180) ; National Research Council (NRC) of Sri Lanka(NRC-11-180) ; National Natural Science Foundation of China(41173011) ; National Natural Science Foundation of China(41173011) ; University of Peradeniya(RG/2012/41/S) ; University of Peradeniya(RG/2012/41/S) ; National Research Council (NRC) of Sri Lanka(NRC-11-180) ; National Research Council (NRC) of Sri Lanka(NRC-11-180) ; National Natural Science Foundation of China(41173011) ; National Natural Science Foundation of China(41173011) ; University of Peradeniya(RG/2012/41/S) ; University of Peradeniya(RG/2012/41/S)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84818]  
专题中国科学院地质与地球物理研究所
通讯作者Dharmapriya, P. L.
作者单位1.Univ Peradeniya, Postgrad Inst Sci, Peradeniya 20400, Sri Lanka
2.Univ Peradeniya, Fac Sci, Dept Geol, Peradeniya 20400, Sri Lanka
3.Swiss Fed Inst Technol, Dept Earth Sci, CH-8092 Zurich, Switzerland
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
5.Inst Fundamental Studies, Kandy 20000, Sri Lanka
6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Dharmapriya, P. L.,Malaviarachchi, Sanjeewa P. K.,Galli, Andrea,et al. P-T evolution of a spinel plus quartz bearing khondalite from the Highland Complex, Sri Lanka: Implications for non-UHT metamorphism[J]. JOURNAL OF ASIAN EARTH SCIENCES,2014,95:99-113.
APA Dharmapriya, P. L..,Malaviarachchi, Sanjeewa P. K..,Galli, Andrea.,Su, Ben-Xun.,Subasinghe, N. D..,...&Zhu, Bin.(2014).P-T evolution of a spinel plus quartz bearing khondalite from the Highland Complex, Sri Lanka: Implications for non-UHT metamorphism.JOURNAL OF ASIAN EARTH SCIENCES,95,99-113.
MLA Dharmapriya, P. L.,et al."P-T evolution of a spinel plus quartz bearing khondalite from the Highland Complex, Sri Lanka: Implications for non-UHT metamorphism".JOURNAL OF ASIAN EARTH SCIENCES 95(2014):99-113.

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来源：地质与地球物理研究所

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