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Article: Laser ablation ICP-MS titanite U-Th-Pb dating of hydrothermal ore deposits: A case study of the Tonglushan Cu-Fe-Au skarn deposit, SE Hubei Province, China

TitleLaser ablation ICP-MS titanite U-Th-Pb dating of hydrothermal ore deposits: A case study of the Tonglushan Cu-Fe-Au skarn deposit, SE Hubei Province, China
Authors
KeywordsLA-ICP-MS
Skarn ore deposit
Titanite
U-Th-Pb dating
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
Citation
Chemical Geology, 2010, v. 270 n. 1-4, p. 56-67 How to Cite?
AbstractTitanite from the Tonglushan Cu-Fe-Au skarn deposit, Daye district, eastern China, has been successfully dated by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Hydrothermal titanite from both skarn ores and calcite veins cutting the ore bodies are characterized by having much lower REE and Th/U and Lu/Hf ratios compared to their magmatic equivalents from the ore-related Yangxin quartz diorite intrusion and a late-stage albitite dike. Titanite from the Yangxin quartz diorite and an albitite dike, which intrudes both the quartz diorite intrusion and ore bodies, yield weighted mean 206Pb/238U ages of 136.0 ± 1.5 Ma and 120.6 ± 2.3 Ma (2σ), respectively, in agreement within analytical uncertainty to their 208Pb/232Th ages. In situ analysis of epidote-enclosed hydrothermal titanite in thin sections of a skarn ore sample yields a mean 206Pb/238U age of 135.9 ± 1.3 Ma and 208Pb/232Th age of 138.2 ± 4.5 Ma, whereas titanite in calcite from a calcite-dominated vein cross-cutting the skarn ore body has consistent 206Pb/238U and 208Pb/232Th ages of ca. 121 Ma. The data thus reveal two independent hydrothermal events. The earlier event was responsible for the known Cu-Fe-Au skarn mineralization at Tonglushan and throughout the Daye district, and was caused by coeval magmatism that has resulted in the emplacement of the Yangxin quartz diorite. The later event, previously unrecognized, was associated with a second magmatic pulse as represented by the albitite dikes, and provides potential for discovering new mineral deposits at Tonglushan and possibly over the Daye district. This study represents the first direct dating of skarn deposits using titanite U-Th-Pb geochronometer and signifies the utilization of titanite for precise dating of hydrothermal ore formation. © 2009 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/124648
ISSN
2015 Impact Factor: 3.482
2015 SCImago Journal Rankings: 2.346
ISI Accession Number ID
Funding AgencyGrant Number
NSFC90814004
40821061
40334037
111 ProjectB107039
Funding Information:

Research work is jointly supported by the NSFC grants 90814004, 40821061, and 40334037 and the 111 Project (B107039). Ms. Zhang Su-Xin and Mr. Zheng Shu are thanked for their expert assistance during the SEM and EMP analysis, respectively. Dr. Richard J Goldfarb read an earlier draft of the paper and provided many useful comments, which are greatly acknowledged. Comments by Drs. Antonio Simonetti and Khin Zaw have been important in improving the final presentation of this work. Our thanks are also due to Prof. Roberta Rudnick, editor of Chemical Geology, for her useful suggestions in our revision.

References

 

DC FieldValueLanguage
dc.contributor.authorLi, JWen_HK
dc.contributor.authorDeng, XDen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorLiu, YSen_HK
dc.contributor.authorZhao, XFen_HK
dc.contributor.authorGuo, JLen_HK
dc.date.accessioned2010-10-31T10:46:19Z-
dc.date.available2010-10-31T10:46:19Z-
dc.date.issued2010en_HK
dc.identifier.citationChemical Geology, 2010, v. 270 n. 1-4, p. 56-67en_HK
dc.identifier.issn0009-2541en_HK
dc.identifier.urihttp://hdl.handle.net/10722/124648-
dc.description.abstractTitanite from the Tonglushan Cu-Fe-Au skarn deposit, Daye district, eastern China, has been successfully dated by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Hydrothermal titanite from both skarn ores and calcite veins cutting the ore bodies are characterized by having much lower REE and Th/U and Lu/Hf ratios compared to their magmatic equivalents from the ore-related Yangxin quartz diorite intrusion and a late-stage albitite dike. Titanite from the Yangxin quartz diorite and an albitite dike, which intrudes both the quartz diorite intrusion and ore bodies, yield weighted mean 206Pb/238U ages of 136.0 ± 1.5 Ma and 120.6 ± 2.3 Ma (2σ), respectively, in agreement within analytical uncertainty to their 208Pb/232Th ages. In situ analysis of epidote-enclosed hydrothermal titanite in thin sections of a skarn ore sample yields a mean 206Pb/238U age of 135.9 ± 1.3 Ma and 208Pb/232Th age of 138.2 ± 4.5 Ma, whereas titanite in calcite from a calcite-dominated vein cross-cutting the skarn ore body has consistent 206Pb/238U and 208Pb/232Th ages of ca. 121 Ma. The data thus reveal two independent hydrothermal events. The earlier event was responsible for the known Cu-Fe-Au skarn mineralization at Tonglushan and throughout the Daye district, and was caused by coeval magmatism that has resulted in the emplacement of the Yangxin quartz diorite. The later event, previously unrecognized, was associated with a second magmatic pulse as represented by the albitite dikes, and provides potential for discovering new mineral deposits at Tonglushan and possibly over the Daye district. This study represents the first direct dating of skarn deposits using titanite U-Th-Pb geochronometer and signifies the utilization of titanite for precise dating of hydrothermal ore formation. © 2009 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeoen_HK
dc.relation.ispartofChemical Geologyen_HK
dc.subjectLA-ICP-MSen_HK
dc.subjectSkarn ore depositen_HK
dc.subjectTitaniteen_HK
dc.subjectU-Th-Pb datingen_HK
dc.titleLaser ablation ICP-MS titanite U-Th-Pb dating of hydrothermal ore deposits: A case study of the Tonglushan Cu-Fe-Au skarn deposit, SE Hubei Province, Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0009-2541&volume=270&issue=1-4&spage=56&epage=67&date=2010&atitle=Laser+ablation+ICP-MS+titanite+U-Th-Pb+dating+of+hydrothermal+ore+deposits:+A+case+study+of+the+Tonglushan+Cu-Fe-Au+skarn+deposit,+SE+Hubei+Province,+Chinaen_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.chemgeo.2009.11.005en_HK
dc.identifier.scopuseid_2-s2.0-74449084834en_HK
dc.identifier.hkuros181432en_HK
dc.identifier.hkuros177766-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-74449084834&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume270en_HK
dc.identifier.issue1-4en_HK
dc.identifier.spage56en_HK
dc.identifier.epage67en_HK
dc.identifier.isiWOS:000274989800006-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLi, JW=36067183300en_HK
dc.identifier.scopusauthoridDeng, XD=16042105200en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridLiu, YS=35369015600en_HK
dc.identifier.scopusauthoridZhao, XF=49061648300en_HK
dc.identifier.scopusauthoridGuo, JL=49261091500en_HK
dc.identifier.citeulike6189155-

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