Earth Science Frontiers ›› 2020, Vol. 27 ›› Issue (2): 45-59.DOI: 10.13745/j.esf.sf.2020.3.11

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Preliminary study on the Triassic continental mineralization system in China

WANG Denghong1(), CHEN Yuchuan2, JIANG Biao1,*(), HUANG Fan1, WANG Yan1, LI Huaqin3, HOU Kejun1   

  1. 1. Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
    2. Chinese Academy of Geological Sciences,Beijing 100037, China
    3. Wuhan Geological Survey Center, China Geological Survey, Wuhan 430205, China
  • Received:2020-01-10 Revised:2020-02-28 Online:2020-03-25 Published:2020-03-25
  • Contact: JIANG Biao

Abstract:

The Triassic mineralization system in China is composed of mineralization and all of the metallogenic series (sub-series) which formed in the continental environment (including the continental margin) during the Triassic (250-205 Ma) period. It is established that such metallogenic series such as those formed at Altai, Beishan, northern and southern margins of North China block, Liaoning-Jilin, Ordos, southwest Sanjiang area, Qiangtang, Upper Yangtze, Hunan-Hubei-Jiangxi border region, and Yunkai-Leiqiong, roughly constructed the Triassic mineralization system in China. Compare to Yanshanian, Indosinian mineralization is weaker. Sanjiang-Songpan Ganzi area in southwestern China has excellent protential of large-scale prospecting of deposits, even though the movement was strong in Indosinian. Recent isotope chronology studies have shown that, some deposits that were previously thought to have formed in the Hercynian (such as Dakalasu, Xiaokalasu pegmatitic rare metal deposits in Altai) or Yanshanian period (such as Xiaotongjiapuzi Au deposit and Gaojiapuzi Ag deposit in Liaoji rift zone) formed during the Indosinian period or experienced the mineralization process of the Indosinian cycle. During the whole evolution of Triassic, the two blocks of North China and South China were combined, and the combination zone and paleo-tectonics of the southern and northern edges of North China were re-activated and became the central metallogenic belt of the endogenous minerals. The continental basins such as the Ordos in North China and the small intermountain basins in South China have created conditions for the formation of coal, oil, gas, paste, and other sedimentary minerals. The evolution of the Tethys tectonic region in the southwest has undergone significant tectonic changes from the ocean to the land, especially the Indosinian movement, which has played an essential role in the formation of the continental pattern since the Mesozoic period of China. It has also laid a foundation for the formation of the basin-mountain pattern and the enrichment of its mineral resources in the Sichuan Basin. Therefore, the Triassic mineralization system can provide not only comprehensive basis for tectonic-rebuilding but also provides a theoretical basis for metallogenic prediction.

Key words: Triassic, continental mineralization system, minerogenetic series, mineralization-concentration area

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