- 责任者：Zhang Bangtong (State Key Laboratory for Mineral Deposits Research and School of Earth Sciences ; Nanjing University ; Nanjing 210093 ; China) ; Wu Junqi
- 刊名：Acta Geologica Sinica
- 出版年：2012
- 卷期：86(7)
- 关键词：花岗岩 ; granite ; 南岭 ; Nanling Mountains
- 页码：p.1031-1046
- 图表：illus., 6 tables, 106 refs.
- 分类号：0801
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
Based on geological and geochemical study, it can be concluded that the Huashan and Guposhan granite batholiths have an emplacement depth of 5. 5 km, the country rocks temperature of 196℃, and initial granite melt temperature of 950℃during process of emplacement. Mathematic model established in this study yields that, after emplacement of the granites, cooling time（Δtcol）from its initial temperature to crystallization temperature of granite melt is 4.14 Ma for Huashan and 4.36 Ma for Guposhan. Because latent heat released from crystallization prolonged cooling time by 2.67 Ma and 2.81 Ma, and granite batholiths in these two areas contain more radioactive elements（U：13.5×10-6, Th：56.1×10-6, K2O： 5.79%for Huashan;U：13.7×10-6, Th：52.4×10-6 and K2O：5.28%for Guposhan）, higher than the average content of radioactive elements in granite（U：5×10-6, Th：20×10-6 and K2O：2.66%）, radioactivity resulting from Huashan and Guposhan granites prolonged crystallization time to 37.6 Ma and 45. 1 Ma, much longer thanΔtAvalue calculated for world average granites（3.17Ma, Huashan）. Time differences（△tECTD）of emplacement and crystallization of two granite batholiths are 44.41 Ma and 52.27 Ma. In combination with zircon U-Pb ages of 162 Ma for Huashan and 163 Ma for Guposhan, inversion calculation yields emplacement ages of 206 Ma and 215 Ma for Huashan and Guposhan granite batholiths, and this provides important magmatic and dynamic evidence for emplacement of Huashan and Guposhan granite batholiths at the Indosinian period.