%0 Journal Article
%T Tectono-thermochronology and gold mineralization events of orogenic gold deposits in Ailaoshan orogenic belt, Southwest China: Geochronological constraints<br>哀牢山造山带金矿成矿时序及其动力学背景探讨
%A YANG LiQiang
%A DENG Jun
%A ZHAO Kai
%A LIU JiangTao
%A <br>杨立强
%A 邓军
%A 赵凯
%A 刘江涛
%J 岩石学报
%D 2011
%I 
%X Ailaoshan gold belt, one of the most important Himalayan orogenic-type gold belt in China, formed during the processes of superimposed orogenesis in Sanjiang Tethys. The relationship between mineralization events and tectono-thermochronology as well as the related geodynamic regimes has been discussed in terms of the isotope dating result of gold mineralization in Ailaoshan orogenic belt. Hercynian period is considered to be the oldest mineralization concentrated time through the ages obtained, however, the real metallogenic ages deviated from the apparent ages due to the excess argon, the regional ophiolites formed synchronously to the youngest apparent age (345.2±16Ma); the relationship between gold contents in auriferous pyrite silicolite and hydrothermal deposition suggest the geodynamic regime of seafloor spreading and initial ocean basin forming. Indosinian period is exactly the time at which the main collision of the regional orogen happened, when large-scale magmatism, Cu-Ni-Pt-Pd sulfide deposits, VMS type Cu-Pb-Zn deposits and porphyry Cu-Au deposits happened intensively, besides Re-Os isochron age of auriferous pyrite from Laowangzhai gold ore deposit is 229±38Ma. Metallogenic ages during Yanshan are split up into several scattered periods (180Ma, 135Ma, 110Ma and 90Ma), the apparent age of the latest age spectra (91±1Ma) is likely the response to significant transition of geodynamic regime, besides the lage-scale regional diagenesis (porphyry) and metallogenesis (porphyry Cu-Mo-W-Au deposits) during the period (ca. 90~70Ma) corresponds the transition of tectonic regimes from accretion orogeny to collision orogeny. Himalayan period are divided into three tectonic-thermal events related to mineralization, namely the early, occurred from 63.09~61.55Ma, the main, occurred from 36.10~33.76Ma, and the late, occurred from 30.80~26.40Ma, which were controlled by the strongly early convergence geodynamic regime of India-Euraisa, the early to late stage transition of geodynamic regime, and eastward escapation of the Tibetan Plateau, and pulsating uplift of asthenosphere, respectively. The metallogenic characteristics, combined with published geological and isotopic information, indicate that the large-scale gold metallogeny is closely related to the intense crust-mantle material exchange and the tectonic deformation in the transition of geodynamic regimes.
%K Tectono-thermochronology
%K Mineralization event
%K Orogenic gold deposit
%K Ore-system as geodynamic probe
%K Ailaoshan orogenic belt
%K Southwest China<br>构造热事件
%K 成矿年代学
%K 造山型金矿
%K 矿床探针
%K 哀牢山造山带
%K 中国西南
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=B0A3094CBEF84E9161A156258EA7C036&yid=9377ED8094509821&vid=DB817633AA4F79B9&iid=9CF7A0430CBB2DFD&sid=9F3181A7026115DD&eid=1E97FD20C6EBC45D&journal_id=1000-0569&journal_name=岩石学报&referenced_num=3&reference_num=48