2014年3月，第20卷，第1期，01-08页 March 2014,Vol.20,No.1,pp.0108
高校地质学报
Geological Journal of China Universities
燕山早期花岗岩基印支期侵位的岩浆动力学证据及构造
意义：基于南岭8个岩体侵位年龄计算结果
章邦桐，吴俊奇，凌洪飞，陈培荣
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
摘要：根据各花岗岩体地质构造特征、有关的热物理参数及主体花岗岩的放射性元素含量，采用简化的立方体数学模型计算得出：南岭地区8个花岗岩基侵位后，其初始温度降低至结晶温度所需的时间（△t）为3.9（金鸡岭）~5.5Ma（九峰）；由于结晶潜热释放而使结晶过程延长的时间（△t，）为2.6~3.5Ma：花岗岩浆侵位后产生的放射成因热使结晶过程延长的时间（△t）为5.2（陂头）~45.1Ma（姑婆山）。南岭地区8个燕山早期花岗岩基的侵位-结晶时差（△tgcm）为12.1（陂头）（）（南岭燕山早期花岗岩基属于印支期侵位提供了重要的岩浆动力学佐证，揭示出近东西向展布的南岭晚中生代造山带具有印
支期构造格架（以侵位年龄为代表）和燕山早期花岗岩（以锆石U-Pb年龄为代表）的双重特征。关键调：南岭燕山早期花岗岩基；侵位年龄；侵位-结晶时差；印支造山运动；岩浆动力学证据
中图分类号：P588.12
文献标识码：A
文章编号：10067493（2014)010001-08
Magma-dynamicEvidenceforIndosinianEmplacementandTectonic ImplicationoftheEarlyYanshanianGraniteBatholiths,SouthChina: Based onEstimates of EmplacementAgefor the8GraniteBatholiths
inNanlingRange
ZHANG Bangtong,WU Junqi,LING Hongfei, CHEN Peirong
State Key Laboratory for Mineral Deposits Research , School of Earth Sciences and Engineering.
Nanjing University, Nanjing 210093, China
Abstract: Based on the geological-tectonic features,the related thermophysical parameters and the radioactive element concentrations for each granite batholith, the simplified cubic mathematic model calculation results suggest that the cooling time from initilal temperature to crystallization temperature (t) for the 8 Early Yanshanian batholiths in Nanling (NR) Rang were 3.9 oeoaeaaeoeoo oas (eire were 2.6 ~ 3.5 Ma and the prolongation time caused by radiogenic heat from decay of the radioactive elements (r) were 5.2 Ma(Pitou batholith) ~ 45.1 Ma (Guposhan batholith). The time difference elapsed from the magma emplacement to the crystallization(tecro) were12.1 Ma (Pitou batholith)~52.2 Ma (Guposhan batholith)for the 8 Early Yanshanian batholiths in Nanling Rang and in combination with the zircon UPb ages of these granitoids and inversion calculation, the emplacement ages were 194.4 Ma (Pitou batholith)~219.3 Ma (Jiufeng batholith). These data provide important magma-dynamic evidence for the Indosinian _emplacement of the Early Yanshanian batholiths in Nanling Rang and display the double magmatic-tectonic features in NR ie., the EW trending Indosinian tectonic framework( represented by tg ) and the Early Yanshan granite batholiths(represented by tc).
Key words: Early Yanshanian batholith in Nanling Rang ; emplacement age; emplacement-crystallization time dfference; Indo
Sinian Orogeny; magma'dynamic evidence
First author: ZHANG Bangtong, Professor; E-mail: zhangbt304@163.com 收稿日期：2013-06-13；修回日期：2013-0725
基金项目：中国核工业地质局十二五科技项目（2011-D03）：内生金属矿床成矿机制研究国家重点实验室研究项目（2008-I-04）作者简介：章邦桐，教授，博士生导师，主要研究方间：核能地质及成矿理论；E-mai让：zhangbt304@.163.oom