- 责任者：Guo Xiaojun (State Key Laboratory of Continental Dynamics ; Department of Geology ; Northwest University ; Xi’an 710069 ; China) ; Zhang Chengli
- 刊名：Chinese Journal of Geology
- 出版年：2013
- 卷期：48(4)
- 关键词：花岗岩 ; granite ; 新疆 ; Xinjiang
- 页码：p.1050-1068
- 图表：8 illus., 3 tables, 51 refs.
- 分类号：0801
- issnNo：ISSN0563-5020
- isbnNo：CN11-1937/P
The Guaishishan to the north of coal mine in Balikun area, east Jungger, yield formation ages of 440.6±3.7 Ma and 412.8±3.3 Ma,respectively, indicating that there was an important granitic magmatism during the Early Silurian to Early Devonian. Both plutons are metaluminous-peraluminous and cale-alkalic series. They are characterized by the affinity of island arc magmatism with the enrichment of LILE, poor HFSE, and depletion of Nb, Ta, Ti, P as well as positive Pb anomaly. Of which,the Guaishishan pluton shows high contents of silica and potassium,and high Rb/Sr,low K/Rb ratios and obvious negative Eu anomaly, resulting from the high differentiation granodiorite formed in the stage of mature island arc. Whereas,the granodiorite pluton to the north of coal mine are enriched in Na and Sr with high Sr/Y ratio and low Y and Yb contents, evidently demonstrating that it was formed by the partial melting of lower continental crust during the thickened-crust process due to the oceanic subduetion during the closure of oceanic basin in the later stage of island arc. In addition, the two plutons have positive εHf（t）（ ＋7.64～ ±13.86）and TDM2 ages of 1123 -561 Ma slightly older than their formation ages,which prove that they were products derived by the partial melting of juvenile island arc materials formed from the late Neoproterozoic to the early stage of Early Paleozoie.