[1]史洪峰,续琰祺,张 景,等.西藏赛卓花岗闪长岩锆石U-Pb年龄、地球化学特征及构造意义[J].华东地质,2018,39(02):90-99.[doi:10.16788/j.hddz.32-1865/P.2018.02.002]
 SHI Hong-feng,XU Yan-qi,ZHANG Jing,et al.Geochemistry and zircon U-Pb dating of the Saizhuo granodiorite in Tibet and their tectonic significance[J].East China Geology,2018,39(02):90-99.[doi:10.16788/j.hddz.32-1865/P.2018.02.002]
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西藏赛卓花岗闪长岩锆石U-Pb年龄、地球化学特征及构造意义()
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
39
期数:
2018年02期
页码:
90-99
栏目:
基础地质
出版日期:
2018-06-15

文章信息/Info

Title:
Geochemistry and zircon U-Pb dating of the Saizhuo granodiorite in Tibet and their tectonic significance
文章编号:
2096-1871(2018)02-090-10
作者:
史洪峰1续琰祺2张 景1高 成3李华亮4张 硕2
(1. 中国地质调查局南京地质调查中心,南京 210016; 2. 江苏省地质调查研究院, 南京 210000; 3. 中陕核工业集团二二四大队有限公司,西安 710100; 4. 东华理工大学地球科学学院,南昌 330000)
Author(s):
SHI Hong-feng1XU Yan-qi2ZHANG Jing1 GAO Cheng3LI Hua-liang4ZHANG Shuo2
(1. Nanjing Center, China Geological Survey, Nanjing 210016, China; 2. Geological Survey of Jiangsu Province, Nanjing 210016, China; 3. Geological Party No. 224, China-Shanxi Nuclear Industry Group, Xi’an 710100, China; 4. College of Earth Science, East China Institute of Technology, Nanchang 330000, China)
关键词:
岛弧环境 锆石U-Pb年龄 花岗闪长岩 赛卓地区 西藏
Keywords:
island arc setting zircon U-Pb dating granodiorite Saizhuo area Tibet
分类号:
P518.12
DOI:
10.16788/j.hddz.32-1865/P.2018.02.002
文献标志码:
A
摘要:
对西藏日松地区赛卓花岗闪长岩体进行锆石U-Pb年代学和地球化学研究。赛卓花岗闪长岩体形成于早白垩世,锆石U-Pb年龄为106.0±1.0 Ma。岩体铝饱和指数为0.96~1.02,K2O/Na2O为1.06~1.30,CIPW标准矿物中绝大多数样品含紫苏辉石标准分子,部分样品含透辉石标准分子,岩石中发育大量暗色微粒包体,属于准铝质—弱过铝质、高钾钙碱性系列I型花岗岩; 稀土元素总量为(97.84~143.44)×10-6,轻稀土元素明显富集,δEu为0.63~0.73,具中等负Eu异常; 富集Rb、Th、U,亏损K、Ba、Sr及高场强元素Nb、P、Ti。结合区域地质背景,认为赛卓花岗闪长岩形成于岛弧构造环境,与班公湖—怒江特提斯洋岩石圈向南俯冲有关,为研究班公湖—怒江结合带构造演化提供新证据。
Abstract:
This paper reports chronological and geochemical studies on the Saizhuo granodiorite in the Risong area, western Tibet. Zircon U-Pb dating yields an age of 106.0±1.0 Ma, indicating that the Saizhuo granodiorite emplaced in Early Cretaceous. The granodiorite has A/CNK ratios of 0.96~1.02 and K2O/Na2O ratios of 1.06~1.30. Compared with the CIPW compositions, most samples contain hypersthene and part of samples contains diopside. A large amount of mafic microgranular enclaves occur within granodiorites, suggesting that the Saizhuo granodiorite belongs to metaluminous to weakly peraluminous high-K calc-alkaline series I-type granitoid. The rocks have a total REE content of(97.84~143.44)×10-6 and distinct enrichment of LREE, showing a distinct right-oblique feature. The negative Eu anomalies are obvious, with δEu values of 0.63~0.73. They are also enriched in Rb, Th and U, but depleted in K, Ba, Sr, Nb, P and Ti. Considering regional geology of the Risong area, the Saizhuo granodiorite is inferred to form in an island arc setting related to the southward subduction of the Bangonghu-Nujiang oceanic crust, which provides new evidence for the tectonic evolution of the Bangonghu-Nujiang Tethys Belt.

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备注/Memo

备注/Memo:
*收稿日期:2017-02-17 修订日期:2017-08-16 责任编辑:谭桂丽
基金项目:中国地质调查局“西藏1:5万日土县卡易错地区4幅区域地质调查(编号:1212011121246)”和国家自然科学基金(编号:41603031)项目联合资助。
第一作者简介:史洪峰,1986年生,男,工程师,主要从事构造与成矿地质研究。
更新日期/Last Update: 2018-06-29