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Article: Well-preserved garnet growth zoning in granulite from the Dabie Mountains, central China
Title | Well-preserved garnet growth zoning in granulite from the Dabie Mountains, central China |
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Authors | |
Advisors | Advisor(s):sml 130319 |
Keywords | China Dabie Mountains Garnet growth zoning High-T granulite P-T path |
Issue Date | 1998 |
Publisher | Wiley-Blackwell Publishing Ltd. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=0263-4929 |
Citation | Journal of Metamorphic Geology, 1998, v. 16 n. 2, p. 213-222 How to Cite? |
Abstract | Ultra-high pressure eclogites and granulites both occur in the Dabie Mountains, central China. A garnet porphyroblast from felsic granulite in the Dabie Mountains has been analysed for compositional zoning by electron microprobe. Two segments of the porphyroblast have opposite compositional variations. Segment I (from centre outward 9 mm to analytical point 18) has decreasing XSps and increasing XPyr, while Segment II (from analytical point 18, 1 mm outward to the rim) has increasing XSps and XAlm and decreasing XPyr and XGrs. The compositional zoning in segment I is considered as growth zoning and that in Segment II as diffusive retrograde zoning. Garnet growth zoning records a P-T path prior to the peak granulite metamorphism. The minimum P-T conditions are estimated to be 1.35 GPa and 850°C for peak metamorphism, based on the highest Mg/(Fe+Mg) composition in the garnet (analytical point 18) and matrix hypersthene, biotite and plagioclase. A symplectitic corona surrounds the porphyroblast and appears to have formed at 0.6 GPa and 700°C. The well-preserved growth zoning in garnet suggests a short residence time for the granulite at peak metamorphism and thus rapid tectonic uplift history. The P-T path is consistent with that of ultra-high-pressure eclogite in the area. Tectonic movements during a collisional event could have brought both the granulite and the eclogite to their present positions. |
Persistent Identifier | http://hdl.handle.net/10722/151000 |
ISSN | 2021 Impact Factor: 4.472 2020 SCImago Journal Rankings: 2.639 |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | sml 130319 | - |
dc.contributor.author | Chen, NS | en_HK |
dc.contributor.author | Sun, M | en_HK |
dc.contributor.author | You, ZD | en_HK |
dc.contributor.author | Malpas, J | en_HK |
dc.date.accessioned | 2012-06-26T06:15:41Z | - |
dc.date.available | 2012-06-26T06:15:41Z | - |
dc.date.issued | 1998 | en_HK |
dc.identifier.citation | Journal of Metamorphic Geology, 1998, v. 16 n. 2, p. 213-222 | en_HK |
dc.identifier.issn | 0263-4929 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/151000 | - |
dc.description.abstract | Ultra-high pressure eclogites and granulites both occur in the Dabie Mountains, central China. A garnet porphyroblast from felsic granulite in the Dabie Mountains has been analysed for compositional zoning by electron microprobe. Two segments of the porphyroblast have opposite compositional variations. Segment I (from centre outward 9 mm to analytical point 18) has decreasing XSps and increasing XPyr, while Segment II (from analytical point 18, 1 mm outward to the rim) has increasing XSps and XAlm and decreasing XPyr and XGrs. The compositional zoning in segment I is considered as growth zoning and that in Segment II as diffusive retrograde zoning. Garnet growth zoning records a P-T path prior to the peak granulite metamorphism. The minimum P-T conditions are estimated to be 1.35 GPa and 850°C for peak metamorphism, based on the highest Mg/(Fe+Mg) composition in the garnet (analytical point 18) and matrix hypersthene, biotite and plagioclase. A symplectitic corona surrounds the porphyroblast and appears to have formed at 0.6 GPa and 700°C. The well-preserved growth zoning in garnet suggests a short residence time for the granulite at peak metamorphism and thus rapid tectonic uplift history. The P-T path is consistent with that of ultra-high-pressure eclogite in the area. Tectonic movements during a collisional event could have brought both the granulite and the eclogite to their present positions. | en_HK |
dc.language | eng | en_US |
dc.publisher | Wiley-Blackwell Publishing Ltd. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=0263-4929 | en_HK |
dc.relation.ispartof | Journal of Metamorphic Geology | en_HK |
dc.rights | Journal of Metamorphic Geology. Copyright © Blackwell Publishing Ltd. | - |
dc.rights | The definitive version is available at www3.interscience.wiley.com | - |
dc.subject | China | en_HK |
dc.subject | Dabie Mountains | en_HK |
dc.subject | Garnet growth zoning | en_HK |
dc.subject | High-T granulite | en_HK |
dc.subject | P-T path | en_HK |
dc.title | Well-preserved garnet growth zoning in granulite from the Dabie Mountains, central China | en_HK |
dc.type | Article | en_HK |
dc.identifier.email | Sun, M: minsun@hku.hk | en_HK |
dc.identifier.email | Malpas, J: jgmalpas@hku.hk | en_HK |
dc.identifier.authority | Sun, M=rp00780 | en_HK |
dc.identifier.authority | Malpas, J=rp00059 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.scopus | eid_2-s2.0-0031869273 | en_HK |
dc.identifier.hkuros | 33974 | - |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-0031869273&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 16 | en_HK |
dc.identifier.issue | 2 | en_HK |
dc.identifier.spage | 213 | en_HK |
dc.identifier.epage | 222 | en_HK |
dc.publisher.place | United Kingdom | en_HK |
dc.identifier.scopusauthorid | Chen, NS=12796732200 | en_HK |
dc.identifier.scopusauthorid | Sun, M=25932315800 | en_HK |
dc.identifier.scopusauthorid | You, ZD=7102207880 | en_HK |
dc.identifier.scopusauthorid | Malpas, J=7006136845 | en_HK |
dc.customcontrol.immutable | sml 130319 | - |
dc.identifier.issnl | 0263-4929 | - |