| 藏南拉轨岗日变质核杂岩核部花岗质片麻岩的地球化学特征及构造意义 |
| |
| 引用本文： | 辜平阳,何世平,李荣社,时超,董增产,査显锋,吴继莲,王轶.藏南拉轨岗日变质核杂岩核部花岗质片麻岩的地球化学特征及构造意义[J].岩石学报,2013,29(3):756-768. |
| |
| 作者姓名： | 辜平阳 何世平 李荣社 时超 董增产 査显锋 吴继莲 王轶 |
| |
| 作者单位： | 1. 国土资源部岩浆作用成矿与找矿重点实验室,西安地质调查中心,西安710054
2. 长安大学地球科学与资源学院,西安,710054 |
| |
| 基金项目： | 本文受国家青年基金项目(41002063)和中国地质大调查项目(1212010610102)联合资助. |
| |
| 摘 要： | 拉轨岗日变质核杂岩花岗质片麻岩高SiO2、K2O,低Fe2O3、MgO、MnO,铝饱和指数A/CNK为1.07～1.19,含白云母、石榴子石等过铝质矿物,属高钾钙碱性过铝质岩石.稀土总量较高,轻稀土富集,轻、重稀土分馏明显,Eu负异常；富集大离子亲石元素Rb、Th、U,贫高场强元素Sr、Nb,Hf和Ba亏损,具有壳源S型花岗岩的特征.87Sr/86Sr初始比值ISr变化于0.709～0.7306,εNd(t)值较低,为-7.13 ～-8.97,且εNd(t)和ISr无明显相关关系,εSr(t)值较高,为80.65 ～379.(206Pb/204Pb)t=18.1062 ～18.8085,(207Pb/24Pb)t=15.6713 ～ 15.7901,(208Pb/204Pb)t=37.529 ～ 38.1815,表现出地壳特征的Sr、Nd、Pb同位素特征.岩浆源区可能是以粘土岩主,砂质岩占次要地位的沉积岩,经部分熔融形成的花岗质岩浆上升侵位形成.LA-ICPMS锆石U-Pb年龄为514Ma,是泛非造山事件在北喜马拉雅拉轨岗日一带的地质记录.岩石形成于由碰撞造山的挤压环境向后碰撞造山的伸展环境转化阶段,说明泛非碰撞造山事件在拉雅拉轨岗日一带可能结束,进入后碰撞造山的构造演化阶段.岩浆底侵可能使拉轨岗日变质核杂岩在该阶段已经初步隆起,对变质核杂岩的形成起了重要作用.
|
| 关 键 词： | 拉轨岗日变质核杂岩 花岗片麻岩 地球化学 锆石U-Pb定年 泛非造山事件 |
| 收稿时间： | 2011/12/21 0:00:00 |
| 修稿时间： | 2012/12/29 0:00:00 |
Geochemical features and tectonic significance of granitic gneiss of Laguigangri metamorphic core complexes in southern Tibet |
| |
| GU PingYang,HE ShiPing,LI RongShe,SHI Chao,DONG ZengChan,ZHA XianFeng,WU JiLian and WANG Yi.Geochemical features and tectonic significance of granitic gneiss of Laguigangri metamorphic core complexes in southern Tibet[J].Acta Petrologica Sinica,2013,29(3):756-768. |
| |
| Authors: | GU PingYang HE ShiPing LI RongShe SHI Chao DONG ZengChan ZHA XianFeng WU JiLian and WANG Yi |
| |
| Institution: | Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MLR, Xi'an Geological Survey Center, Xi'an 710054, China;Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MLR, Xi'an Geological Survey Center, Xi'an 710054, China;Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MLR, Xi'an Geological Survey Center, Xi'an 710054, China;Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MLR, Xi'an Geological Survey Center, Xi'an 710054, China;Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MLR, Xi'an Geological Survey Center, Xi'an 710054, China;Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MLR, Xi'an Geological Survey Center, Xi'an 710054, China;Earth Science & Resources College of Chang'an University, Xi'an 710054, China;Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MLR, Xi'an Geological Survey Center, Xi'an 710054, China |
| |
| Abstract: | |
| |
| Keywords: | Laguigangri metamorphic core complexes Granitic gneiss Geochemistry Ziron U-Pb dating Pan African orogenic events |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《岩石学报》浏览原始摘要信息 |
| 点击此处可从《岩石学报》下载免费的PDF全文 |
|
