| 伊春地区斑状二长花岗岩锆石U——Pb 年龄及其地质意义 |
| |
| 引用本文： | 牛延宏,王兴,董国臣,程招勋,郑涛,张跃龙,韩振哲.伊春地区斑状二长花岗岩锆石U——Pb 年龄及其地质意义[J].世界地质,2012,31(2):247-254. |
| |
| 作者姓名： | 牛延宏 王兴 董国臣 程招勋 郑涛 张跃龙 韩振哲 |
| |
| 作者单位： | 1． 黑龙江省地质调查研究总院齐齐哈尔分院，黑龙江齐齐哈尔161005; 2． 中国地质大学地球科学与资源学院，北京100083 |
| |
| 摘 要： | 黑龙江伊春南岔-金山屯地区广泛发育斑状二长花岗岩。岩体呈岩基状产出，岩性为肉红色中粗粒斑状二长花岗岩，斑状，斑晶由钾长石和石英组成，基质由钾长石、斜长石、石英和黑云母组成，局部含角闪石。岩石SiO2 含量69. 58% ～ 75. 96%; 富碱，Na2O + K2O 为7. 22% ～ 8. 45%，K2O/ Na2O 为1. 07 ～ 1. 43 ( σ = 1. 58 ～ 2. 47) ，为钙碱性花岗岩。ΣREE 为178. 68 × 10 － 6 ～ 464. 75 × 10--6， ( La /Yb) N = 11. 6 ～ 20. 22，轻重稀土分馏显著，δEu = 0. 17 ～ 0. 34，具铕负异常，相对富Rb、Th、U、 Nd、La、Pr 等元素，贫Ba、Sr、P、Ti 元素等，显示典型的KCG 型( 高钾钙碱性) 花岗岩特征，属于造山后花岗岩( POG) ，为岩浆混合成因。该花岗岩两个锆石U--Pb 年龄值分别为207 ± 2 Ma、197 ± 1 Ma，属晚三叠世-早侏罗世，可能暗示混合后的结晶持续时间，其形成环境与西伯利亚板块和华北板块碰撞对接后的伸展作用有关。
|
| 关 键 词： | 斑状二长花岗岩 锆石U--Pb 年龄 地质意义 伊春 黑龙江 |
Zircon U-Pb dating of porphyritic monzonitic granite in Yichun and its geological significance |
| |
| NIU Yan-hong
,
WANG Xing
,
DONG Guo-chen
,
CHENG Zhao-xun
,
ZHENG Tao
,
ZHANG Yue-long
,
HAN Zhen-zhe.Zircon U-Pb dating of porphyritic monzonitic granite in Yichun and its geological significance[J].World Geology,2012,31(2):247-254. |
| |
| Authors: | NIU Yan-hong WANG Xing DONG Guo-chen CHENG Zhao-xun ZHENG Tao ZHANG Yue-long HAN Zhen-zhe |
| |
| Institution: | 1． Qiqihar Branch of Heilongjiang Institute of Geological Survey，Qiqihar 161005，Heilongjiang，China; 2． School of Earth Sciences and Resources，China University of Geosciences，Beijing 100083，China |
| |
| Abstract: | Porphyritic monzonitic granites were widely exposed in Nancha-Jinshantun area of Yichun, Heilongjiang. The rock body occurred as batholiths with porphyry shape, and the rocks were flesh pink medium-coarse porphyritic monzonitic granite. Phenocrysts consisted of potash feldspar and quartz and the matrix was composed of potash feldspar, plagioclase, quartz, biotite and a few amphibole locally. The content of SiO2 was 69.58% - 75.96% , alkaline was rich with Na2o ＋ K2o of 7.22% - 8.45% , K20/Na20 = 1.07 - 1.43 （σ = 1.58 2. 47） , belonging to calc-alkaline granite. The EREE was 178.68 × 10^-6 -464.75 × 10^-6, （La/Yb） N = 11.6 20. 22 with obvious LREE/HREE differentiation and negative Eu anomaly （ 8Eu = 0. 17 - 0.34 ）. Trace elements were relatively rich in Rb, Th, U, Nd, La, Pr, （KCG-types） granite and post-orogenic （POG） The age of zranites were 207± 2 Ma and 197 ± 1 and poor in Ba, Sr, P, Ti, indicating typical high-K calc-alkaline granite in characteristics, and formed with magma mixing origin. Ma, belonging to Late Triass and Early Jurassic, indicating magma crystallization duration after mixing. The formation environment was ralated to the extension fuction after the continental collision between Siberia plate and North China plate. |
| |
| Keywords: | porphyritic monzonitic granite zircon U - Pb dating geological significance Yichun Heilongjiang |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《世界地质》浏览原始摘要信息 |
| 点击此处可从《世界地质》下载免费的PDF全文 |
|
