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Volume 39 Issue 6
Nov.  2020
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Article Navigation >  Bulletin of Geological Science and Technology  > 2020  >  39(6): 30-42
He Lianglun, Liu Yu, Yang Kunguang, Cai Jingchen, Wang Jun, Xu Yang. Discovery of 2.5 Ga quartz monzodiorite and its geological significance in Hezhang, western Guizhou[J]. Bulletin of Geological Science and Technology, 2020, 39(6): 30-42. doi: 10.19509/j.cnki.dzkq.2020.0615
Citation: He Lianglun, Liu Yu, Yang Kunguang, Cai Jingchen, Wang Jun, Xu Yang. Discovery of 2.5 Ga quartz monzodiorite and its geological significance in Hezhang, western Guizhou[J]. Bulletin of Geological Science and Technology, 2020, 39(6): 30-42. doi: 10.19509/j.cnki.dzkq.2020.0615
shu

Discovery of 2.5 Ga quartz monzodiorite and its geological significance in Hezhang, western Guizhou

doi: 10.19509/j.cnki.dzkq.2020.0615
  • Received Date: 05 Nov 2019
    Abstract
  • The western Guizhou is located at the southwest margin of the Yangtze Block.The record of 2.5 Ga magmatic events in the Yangtze Block is very little.The Hezhang quartz monzodiorite recently discovered in western Guizhou shows that the LA-ICP-MS U-Pb age of the rock is (2 542±9)Ma, which is the first late Neoarchean rock found in this area.The rock is mainly composed of plagioclase, alkaline feldspar, quartz, amphibole, biotite, etc.It has medium high content of SiO2 (59.2%-60.6%), Na2O (4.70%-4.85%), and Na2O/K2O (3.02%-3.19%)ratios, and low content of Al2O3 (17%-17.7%) and MgO(2.42%-2.61%).The total number of rare earth elements (REE) was 120×10-6-221×10-6, (La/Yb)N=(8.32-17.98), and the differentiation of light- and heavy-REEs was not obvious, which showed a right-leaning type.The rocks have negative anomaly of Eu, enrichment in large ion lithophile elements (LILEs)(Ba, Sr) and deficency in high field strong elements (HSFEs) (Nb, Ta, Ti).The samples have weak negative to positive εHf(t) value (-0.51-+6.93) and positive εNd(t) value (+0.22-+0.88).The rock has the characteristics of low-Al type and high HREE TTG series.The comprehensive study shows that this rock may be formed by partial melting of metasomatism between the oceanic subducted plate and the water-bearing mantle wedge in the low-pressure shallow environment under eclogite facies.The residual phases in the source area are mainly rutile and a small amount of amphibole.This first report of 2.5 Ga rocks confirms the existence of the Neoarchean basement in the southwest margin of Yangtze Block, which provides a basis for the study of detrital zircons of Neoarchean magmatic origin around the Yangtze Block and provides new information for the evolution of the Neoarchean crust of the Yangtze Block.

     

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