Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (2): 380-399.doi: 10.13278/j.cnki.jjuese.20200002

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Geochronology,Geochemistry and Geological Significance of the Latest Intrusive Rocks in Pingying Granite Pluton from Baotan Tin Polymetallic Metallogenic Area, Northern Guangxi

Qin Xiaofeng1,2, Zhang Cheng1,2, Wang Zongqi3, Ma Shouxian3, Gong Jianghua3, Feng Yi1,2, Cui Anmin1,2, Li Dong1,2   

  1. 1. College of Earth Science, Guilin University of Technology, Guilin 541004, Guangxi, China;
    2. Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration(Guilin University of Technology), Guilin 541004, Guangxi, China;
    3. Institute of Mineral Resources, Chinese Amdemy of Geological Sciences, Beijing 100037, China
  • Received:2020-01-04 Published:2021-04-06
  • Supported by:
    Supported by the Project of China Geological Survey(DD20160124,12120114039501)

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Abstract: The polymetallic mineralization system of the Baotan Sn deposit frequent magmatic activities in northern Guangxi, the Pingying plutons are composed of early intrusions and late intrusions which is related to the polymetallic mineralization system of Sn deposit. The latter often contains more tourmalite-quartz enclaves. A study on petrology, zircon U-Pb geochronology and geochemistry, shows that the latest intrusive rocks in the Pingying granite pluton is composed of (medium) fine-grained porphyritic biotite (monzonite-) alkali feldspar granite. The U-Pb zircon dating results show that the formation age of the late intrusions was in (769.2±2.5) Ma, and that of the tourmaline-quartz spherulitic bodies was in (795.1±3.1) Ma. The Pingying plutons are generally characterized by rich large ion lithophile elements (LILE, including Rb, Th, U, etc.) and depleted high field strength elements (HFSE, including Nb, Ti, etc.). However, the early and late intrusions are quite different from each other in terms of geochemical characteristics:The early intrusions is belonging to high-K calc-alkaline strongly peraluminous S-type granite, with obvious "U"-shaped peaks for Th-U and "V"-shaped troughs for Ti on the trace elements spider diagram; While the late intrusions is belonging to the shoshonite series, which show "V"-shaped peaks for uranium (U) and "U"-shaped troughs for La-Nd and Eu-Ti on the trace elements spider diagram. According to the results of the study on the properties of the magma source region, the early intrusions belongs to the post-orogenic granite, and may be derived from magma generated by the partial melting of argillaceous rocks and then fractional crystallization of high degree; The late intrusions falls into the non-orogenic granite, and may be the product of the mixing of various degrees of magma and mantle-derived magma generated by the partial melting of argillaceous rocks and psammitolite. There was a genetic relationship between the tourmalite-quartz veins formed in magmatic water at the metallogenic stage of tourmalite-quartz enclaves combined with Zhaigun tin-polymetallic deposit. Moreover, the formation age was basically the same as that of Tianpeng rock mass. Therefore, it is speculated that the tourmalite-quartz enclaves were formed by late intrusive rock capturing the magmatic hydrothermal tourmalite-quartz vein formed during the emplacement of early intrusive rock (Tianpeng rock mass), and the formation age may represent the metallogenic age of tourmalite-quartz mineralization in this area.

Key words: Pingying granite pluton, tourmalite, chronology, geochemistry, Baotan tin polymetallic metallogenic area, northern Guangxi

CLC Number: 

  • P588.12
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