File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Geochronology of the Pengjiakuang and Rushan gold deposits, eastern Jiaodong gold province, northeastern China: Implications for regional mineralization and geodynamic setting

TitleGeochronology of the Pengjiakuang and Rushan gold deposits, eastern Jiaodong gold province, northeastern China: Implications for regional mineralization and geodynamic setting
Authors
Issue Date2006
PublisherSociety of Economic Geologists, Inc.. The Journal's web site is located at http://www.segweb.org/publications/journal.aspx
Citation
Economic Geology, 2006, v. 101 n. 5, p. 1023-1038 How to Cite?
AbstractThe Jiaodong gold province, the largest gold-producing district in China, is located in the Jiaodong peninsula at the eastern margin of the North China craton and bounded by the continental scale Tan-Lu fault, 40 km to the west. Previous geochronological studies suggest that pervasive gold deposition took place in the western part of the province between 122 and 119 Ma. Here we report high-quality 40Ar/39Ar ages of the Pengjiakuang and Rushan deposits from the eastern part of the Jiaodong gold province, placing additional chronological constraints on the timing of regional mineralization. Seven sericite grains extracted from auriferous alteration assemblages at the Pengjiakuang deposit yielded well-defined plateau ages between 120.9 ± 0.4 and 119.1 ± 0.2 Ma (2σ). Three separates of igneous biotite from a sample of the Queshan gneissic granite, adjacent to the Pengjiakuang deposit, gave reproducible plateau ages of 124.6 ± 0.6 to 123.9 ± 0.4 Ma (2σ). Six sericite separates from two samples in the Rushan deposit yielded 40Ar/39Ar plateau ages at 109.3 ± 0.3 to 107.7 ± 0.5 Ma (2σ), whereas biotite from the Kunyushan monzogranite that hosts the Rushan deposit had plateau ages ranging from 129.0 ± 0.6 to 126.9 ± 0.6 Ma (3 separates from one sample). The apparent age gap between hydrothermal sericite and magmtic biotite from both deposits, together with the similar argon closure temperatures for these mica minerals, suggest that gold mineralization had no direct relationship to the granitoid magmatism. Instead, gold deposition coincided with the emplacement of mafic to intermediate dikes widespread in the Jiaodong gold province, which have been dated at ca. 122 to 119 Ma and, less commonly, at 110 to 102 Ma. The new 40Ar/39Ar ages from the eastern Jiaodong peninsula, when combined with published data from the western part suggest that gold mineralization was broadly contemporaneous throughout the district. The Early Cretaceous gold mineralization also is widely developed in four other major gold districts along the Tan-Lu fault. The temporal and spatial correlation of these gold deposits with mafic to intermediate dikes commonly found in most mineralized areas, the presence of well-documented metamorphic core complexes and half-graben basins along the Tan-Lu fault, and voluminous basalts therein, suggest that the Early Cretaceous was an important period of lithospheric extension, possibly caused by the late Mesozoic lithospheric thinning beneath the eastern block of the North China craton. Lithospheric thinning and extension could have resulted in abnormally high heat and fluid fluxes necessary for large-scaled gold mineralization. © 2006 Society of Economic Geologists, Inc.
Persistent Identifierhttp://hdl.handle.net/10722/72795
ISSN
2015 Impact Factor: 2.487
References

 

DC FieldValueLanguage
dc.contributor.authorLi, JWen_HK
dc.contributor.authorVasconcelos, Pen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorZhao, XFen_HK
dc.contributor.authorMa, CQen_HK
dc.date.accessioned2010-09-06T06:45:10Z-
dc.date.available2010-09-06T06:45:10Z-
dc.date.issued2006en_HK
dc.identifier.citationEconomic Geology, 2006, v. 101 n. 5, p. 1023-1038en_HK
dc.identifier.issn0361-0128en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72795-
dc.description.abstractThe Jiaodong gold province, the largest gold-producing district in China, is located in the Jiaodong peninsula at the eastern margin of the North China craton and bounded by the continental scale Tan-Lu fault, 40 km to the west. Previous geochronological studies suggest that pervasive gold deposition took place in the western part of the province between 122 and 119 Ma. Here we report high-quality 40Ar/39Ar ages of the Pengjiakuang and Rushan deposits from the eastern part of the Jiaodong gold province, placing additional chronological constraints on the timing of regional mineralization. Seven sericite grains extracted from auriferous alteration assemblages at the Pengjiakuang deposit yielded well-defined plateau ages between 120.9 ± 0.4 and 119.1 ± 0.2 Ma (2σ). Three separates of igneous biotite from a sample of the Queshan gneissic granite, adjacent to the Pengjiakuang deposit, gave reproducible plateau ages of 124.6 ± 0.6 to 123.9 ± 0.4 Ma (2σ). Six sericite separates from two samples in the Rushan deposit yielded 40Ar/39Ar plateau ages at 109.3 ± 0.3 to 107.7 ± 0.5 Ma (2σ), whereas biotite from the Kunyushan monzogranite that hosts the Rushan deposit had plateau ages ranging from 129.0 ± 0.6 to 126.9 ± 0.6 Ma (3 separates from one sample). The apparent age gap between hydrothermal sericite and magmtic biotite from both deposits, together with the similar argon closure temperatures for these mica minerals, suggest that gold mineralization had no direct relationship to the granitoid magmatism. Instead, gold deposition coincided with the emplacement of mafic to intermediate dikes widespread in the Jiaodong gold province, which have been dated at ca. 122 to 119 Ma and, less commonly, at 110 to 102 Ma. The new 40Ar/39Ar ages from the eastern Jiaodong peninsula, when combined with published data from the western part suggest that gold mineralization was broadly contemporaneous throughout the district. The Early Cretaceous gold mineralization also is widely developed in four other major gold districts along the Tan-Lu fault. The temporal and spatial correlation of these gold deposits with mafic to intermediate dikes commonly found in most mineralized areas, the presence of well-documented metamorphic core complexes and half-graben basins along the Tan-Lu fault, and voluminous basalts therein, suggest that the Early Cretaceous was an important period of lithospheric extension, possibly caused by the late Mesozoic lithospheric thinning beneath the eastern block of the North China craton. Lithospheric thinning and extension could have resulted in abnormally high heat and fluid fluxes necessary for large-scaled gold mineralization. © 2006 Society of Economic Geologists, Inc.en_HK
dc.languageengen_HK
dc.publisherSociety of Economic Geologists, Inc.. The Journal's web site is located at http://www.segweb.org/publications/journal.aspxen_HK
dc.relation.ispartofEconomic Geologyen_HK
dc.titleGeochronology of the Pengjiakuang and Rushan gold deposits, eastern Jiaodong gold province, northeastern China: Implications for regional mineralization and geodynamic settingen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0361-0128&volume=101&issue=5&spage=1023&epage=1038&date=2006&atitle=Geochronology+of+the+Pengjiakuang+and+Rushan+gold+deposits,+eastern+Jiaodong+Gold+Province,+northeastern+China:+Implications+for+regional+mineralization+and+geodynamic+settingen_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.2113/gsecongeo.101.5.1023en_HK
dc.identifier.scopuseid_2-s2.0-33847299525en_HK
dc.identifier.hkuros167281en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33847299525&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume101en_HK
dc.identifier.issue5en_HK
dc.identifier.spage1023en_HK
dc.identifier.epage1038en_HK
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLi, JW=36063037900en_HK
dc.identifier.scopusauthoridVasconcelos, P=7005771965en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridZhao, XF=8942065800en_HK
dc.identifier.scopusauthoridMa, CQ=8142218900en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats