Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (3): 675-693.doi: 10.13278/j.cnki.jjuese.20180227

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Petrological and Geochemical Evidence of Anatexis Collapse in Continental Orogenic Belt: Taking Anatectite of North Dabie Terrain as an Example

Wang Deyuan1, Xu Haijin2, Wang Pan2, Jia Min1, Gao Zhandong1   

  1. 1. Guizhou Institute of Mountain Resources, Guiyang 550001, China;
    2. School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
  • Received:2018-08-28 Online:2020-05-26 Published:2020-05-29
  • Supported by:
    Supported by National 13th Five-Year Key R & D Program (2016YFC0502606),Guizhou Academy of Sciences Ability Enhancement Project for Innovative Talent Teams (QIAN Academy of Sciences Talents[2019] 08) and Youth Fund Project of Guizhou Academy of Sciences (QIAN Academy of Sciences J-Word[2019]No.09)

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Abstract: North Dabie terrain (NDT) is located in the core of Dabie orogenic belt, where a large number of migmatites were formed during the collapse of orogen. It is of great significance to understand the formation and evolution of Dabie orogenic belt. The protolith of NDT migmatites are TTG (D) rocks generated from the anatexis induced by dehydration and melting of biotite and amphibolite. The plagioclase-rich leucosome produced in the bedding with Pl+Qtz+Bi±Kfs±Hbl is its major mineral composition. The pegmatite veins or block masses are rich in K-feldspar-rich leucosome with Kfs+Qtz±Pl±Bi±Hbl as its major mineral composition. The melanosome is a crystalloblastic structure with Hbl+Bi+Pl+Qtz±Cpx as its major mineral composition. The amphibolite and biotite in melanosome usually have directional alignment and distinct melting corrosion structures. The main leucocratic minerals in the melanosome are plagioclase and quartzes, indicating the residual products of partial melting. The whole-rock geochemistry shows that alkali metal elements Na, K, large ion lithophile elements Ba, K, La, and LREE etc. have the priority of entering into the acid melt; however, the compatible elements and middle-high rare earth elements remain in the restite minerals. The leucosomes have the same right deviation REE patterns as that of the granitoids, rich in LREE and loss of HREE, but have a large positive Eu anomaly with the ratios of δEu ranging from 2.48 to 6.55; while the granite is on the contrary, the content of the frame structure composed of the large-grain plagioclases is apparently higher than the normal granite melt, which indicates that the leucosomes are more likely the product of the early crystallization of the melts.

Key words: North Dabie terrain, migmatite, anatexis, collapse of orogen, petrological, geochemical

CLC Number: 

  • P588.12
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