| 南岭花山和姑婆山花岗岩基属印支期侵位:来自花岗岩熔体冷却-结晶和放射成因热计算的依据 |
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| 引用本文： | 章邦桐,吴俊奇,凌洪飞,陈培荣.南岭花山和姑婆山花岗岩基属印支期侵位:来自花岗岩熔体冷却-结晶和放射成因热计算的依据[J].地质学报,2012,86(7):1031-1046. |
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| 作者姓名： | 章邦桐 吴俊奇 凌洪飞 陈培荣 |
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| 作者单位： | 内生金属矿床成矿机制研究国家重点实验室(南京大学)，南京大学地球科学与工程学院，南京， 210093 |
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| 基金项目： | 教育部科学研究重大项目(306007), 内生金属矿床成矿机制研究国家重点实验室研究项目(编号2008-I-04)及中国核工业地质局十一五基础科研项目 (编号YK08) |
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| 摘 要： | 通过对南岭西段花山和姑婆山花岗岩基地质-岩石地球化学特征研究,判明它们的侵位深度(5.5km)、围岩温度(196℃)及岩浆初始温度(950℃),建立起花山和姑婆山岩基的数学计算模型,计算得出:花山-姑婆山花岗岩熔体侵位后,其初始温度降低至结晶温度所需的时间(△tco1)分别为4.14 Ma(花山)和4.36Ma(姑婆山...
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| 关 键 词： | 花山和姑婆山花岗岩基 侵位年龄 侵位-结晶时差 印支造山运动 岩浆动力学证据 |
| 收稿时间： | 2011/8/21 0:00:00 |
| 修稿时间： | 2011/11/15 0:00:00 |
The Indo-Sinian cycle emplacement of the Huashan-Guposhan granite batholiths, western part of Nanling range : The evidence from cooling-crystallization and radiogenic heat calculating of melt |
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| ZHANG Bangtong,WU Junqi,LING Hongfei and CHEN Peirong.The Indo-Sinian cycle emplacement of the Huashan-Guposhan granite batholiths, western part of Nanling range : The evidence from cooling-crystallization and radiogenic heat calculating of melt[J].Acta Geologica Sinica,2012,86(7):1031-1046. |
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| Authors: | ZHANG Bangtong WU Junqi LING Hongfei and CHEN Peirong |
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| Institution: | State Key Laboratory for Mineral Deposits Research and School of Earth Sciences, Nanjing University, Nanjing, 210093 |
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| Abstract: | Based on geological and geochemical study,it can be concluded that the Huashan and Guposhan granite batholiths have an emplacement depth of 5.5km,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 4.14Ma for Huashan and 4.36Ma for Guposhan.Because latent heat released from crystallization prolonged cooling time by 2.67Ma and 2.81Ma,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 37.6Ma and 45.1Ma,much longer thanΔtAvalue calculated for world average granites(3.17Ma,Huashan).Time differences(△tECTD)of emplacement and crystallization of two granite batholiths are 44.41Ma and 52.27 Ma.In combination with zircon U-Pb ages of 162Ma for Huashan and 163Ma for Guposhan,inversion calculation yields emplacement ages of 206Ma and 215Ma 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. |
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| Keywords: | Huashan-Guposhan Granite Batholiths emplacement age emplacement-crystallization time difference Indo-Sinian Orogeny magma-dynamic evidence |
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