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Article: Well-preserved garnet growth zoning in granulite from the Dabie Mountains, central China

TitleWell-preserved garnet growth zoning in granulite from the Dabie Mountains, central China
Authors
Advisors
Advisor(s):sml 130319
KeywordsChina
Dabie Mountains
Garnet growth zoning
High-T granulite
P-T path
Issue Date1998
PublisherWiley-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?
AbstractUltra-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 Identifierhttp://hdl.handle.net/10722/151000
ISSN
2015 Impact Factor: 3.673
2015 SCImago Journal Rankings: 3.397
References

 

DC FieldValueLanguage
dc.contributor.advisorsml 130319-
dc.contributor.authorChen, NSen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorYou, ZDen_HK
dc.contributor.authorMalpas, Jen_HK
dc.date.accessioned2012-06-26T06:15:41Z-
dc.date.available2012-06-26T06:15:41Z-
dc.date.issued1998en_HK
dc.identifier.citationJournal of Metamorphic Geology, 1998, v. 16 n. 2, p. 213-222en_HK
dc.identifier.issn0263-4929en_HK
dc.identifier.urihttp://hdl.handle.net/10722/151000-
dc.description.abstractUltra-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.languageengen_US
dc.publisherWiley-Blackwell Publishing Ltd. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=0263-4929en_HK
dc.relation.ispartofJournal of Metamorphic Geologyen_HK
dc.rightsJournal of Metamorphic Geology. Copyright © Blackwell Publishing Ltd.-
dc.rightsThe definitive version is available at www3.interscience.wiley.com-
dc.subjectChinaen_HK
dc.subjectDabie Mountainsen_HK
dc.subjectGarnet growth zoningen_HK
dc.subjectHigh-T granuliteen_HK
dc.subjectP-T pathen_HK
dc.titleWell-preserved garnet growth zoning in granulite from the Dabie Mountains, central Chinaen_HK
dc.typeArticleen_HK
dc.identifier.emailSun, M: minsun@hku.hken_HK
dc.identifier.emailMalpas, J: jgmalpas@hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.authorityMalpas, J=rp00059en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0031869273en_HK
dc.identifier.hkuros33974-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0031869273&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume16en_HK
dc.identifier.issue2en_HK
dc.identifier.spage213en_HK
dc.identifier.epage222en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridChen, NS=12796732200en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridYou, ZD=7102207880en_HK
dc.identifier.scopusauthoridMalpas, J=7006136845en_HK
dc.customcontrol.immutablesml 130319-

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