Study on Coupling between Yanshannian Tectonic Thermal Events and Gold Mineralization in Jiaodong Ore Concentrating Area in Shandong Province
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    Abstract:

    There were twice major collision orogenic events in Jiaodong area in Mesozoic period. One event was Indo-china orogeny. It was mainly showed as the subduction of Yangtze plate to the North China Plate, and formed Sulu high pressure-ultra-high pressure metamorphic belt, syn-orogenic granite and post-orogenic high alkali syenite. The other event was Yanshan orogeny. Its continental dynamics environment was originated from the transformation of central Asia-Tethyan structural domain to Pacific tectonic domain, and the subduction of Pacific plate. It showed as three times of magmatic activities and stretching in Jiaodong area. In this paper, based on collecting 71 groups of SHRIMP U-Pb zircon age datas, referring to the previous classification scheme, a chronological frame pattern of Yanshanian granites had been put forward: Linglong-Kunyushan granite emplacement was in in 160~150Ma; the formation of Guojialing granodiorite was in 130~126Ma; Weideshan granodiorite-granite emplacement was in 120~110Ma; Laoshan A-type miarolitic cavity parlkaline alkali feldspar granite emplacement was in 110~100Ma and represented the end of Yanshan movement. Gold mineralization in three periods in this area (150Ma, 120~110Ma, 100~90Ma) had coupled relation with Linglong-Kunyushan granite, Guojialing granodiorite and Weideshan granodiorite-granite. Jiaodong tectonic-magmatic events and gold mineralization were controlled by the interactions among Tethyan tectonic domain, Paleo-ocean tectonic domain and the Pacific tectonic domain. The dynamics background of gold ore-forming was the transition of Mesozoic tectonic system and the lithosphere thinning, which was formed by the subduction of the Pacific plate toward the North China Plate.

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yuxuefeng, LI Hongkui, SHAN Wei.2012. Study on Coupling between Yanshannian Tectonic Thermal Events and Gold Mineralization in Jiaodong Ore Concentrating Area in Shandong Province[J]. Acta Geologica Sinica,86(12):1946-1956

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History
  • Received:July 06,2012
  • Revised:October 10,2012
  • Adopted:December 13,2012
  • Online: December 18,2012
  • Published: