必须声明标量变量 "@Script_ID"。 南祁连敖果吞乌兰侵入岩锆石U-Pb年龄及其地质意义-《地球科学与环境学报》
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[1]张新远,王春涛,欧阳光文,等.南祁连敖果吞乌兰侵入岩锆石U-Pb年龄及其地质意义[J].地球科学与环境学报,2018,40(05):546-562.
 ZHANG Xin-yuan,WANG Chun-tao,OUYANG Guang-wen,et al.Zircon U-Pb Ages and Their Geological Significance of Aoguotunwulan Pluton in South Qilian, China[J].Journal of Earth Sciences and Environment,2018,40(05):546-562.
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南祁连敖果吞乌兰侵入岩锆石U-Pb年龄及其地质意义(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第40卷
期数:
2018年第05期
页码:
546-562
栏目:
基础地质与矿产地质
出版日期:
2018-09-15

文章信息/Info

Title:
Zircon U-Pb Ages and Their Geological Significance of Aoguotunwulan Pluton in South Qilian, China
文章编号:
1672-6561(2018)05-0546-17
作者:
张新远王春涛欧阳光文李瑞保
1.青海省地质调查院青海省青藏高原北部地质过程与矿产资源重点实验室,青海西宁 810012;2.长安大学地球科学与资源学院,陕西 西安 710054
Author(s):
ZHANG Xin-yuan WANG Chun-tao OUYANG Guang-wen LI Rui-bao
1. Qinghai Provincial Key Laboratory of Geological Process and Mineral Resources of Northern Qinghai Tibetan Plateau, Qinghai Geological Survey Institute, Xining 810012, Qinghai, China; 2. School of Earth Science and Resources, Chang’an University, Xi’an 710054, Shaanxi, China
关键词:
地球化学锆石U-Pb年龄岩石成因构造环境同碰撞早志留世花岗岩南祁连
Keywords:
geochemistry zircon U-Pb age petrogenesis tectonic environment syn-collision Early Silurian granite South Qilian
分类号:
P588.12;P597
DOI:
-
文献标志码:
A
摘要:
通过对南祁连敖果吞乌兰侵入岩的岩石学、岩石地球化学和锆石U-Pb年龄的研究,确定该侵入岩的形成时代,并探讨其岩石成因及构造意义。结果表明:敖果吞乌兰侵入岩中的似斑状黑云母花岗闪长岩LA-MC-ICP-MS锆石U-Pb年龄为(443.9±2.1)Ma,表明其形成于早志留世初期;敖果吞乌兰侵入岩的SiO2含量(质量分数,下同)为65.72%~69.87%,全碱含量为5.13%~6.70%,Al2O3含量为12.69%~13.82%,Fe2O3含量为0.75%~1.24%,MgO含量为1.67%~2.38%,显示富硅、富碱、富铝和贫铁、贫镁的特征,铝饱和指数主体介于0.96~1.20之间,属于弱过铝质—强过铝质、高钾钙碱性系列岩石;轻稀土元素相对富集(w(La)N/w(Yb)N=6.84~11.36),Eu具明显负异常(0.47~0.62);岩石富集大离子亲石元素K、Rb、B、Th和Sr,亏损高场强元素Nb、Ta、P和Ti。以上特征表明,南祁连敖果吞乌兰侵入岩为Ⅰ型花岗岩。结合区域资料认为,敖果吞乌兰侵入岩形成于同碰撞构造环境,是早志留世初期南祁连洋闭合,两侧陆块发生碰撞,进入碰撞造山阶段的产物。
Abstract:
The petrology, geochemistry and zircon U-Pb age of Aoguotunwulan pluton in South Qilian were studied to determine the age of pluton and explore its petrogenesis and tectonic significance. The results show that the zircon U-Pb age of porphyroid biotite granodiorite in Aoguotunwulan pluton is (443.9±2.1)Ma, indicating that it is formed in the early period of Early Silurian; the SiO2 contents of rocks are 65.72%-69.87%, total alkali contents are 5.13%-6.70%, Al2O3 contents are 12.69%-13.82%, Fe2O3 contents are 0.75%-1.24%, MgO contents are 1.67%-2.38%, showing the characteristics of silicon-rich, alkali-rich, aluminum-rich, iron-poor and magnesium-poor; A/CNK values mainly range from 0.96 to 1.20, manifesting the rocks belong to weak peraluminous-strong peraluminous, high-K calc-alkaline series; light rare earth elements are relatively enriched (w(La)N/w(Yb)N=6.84-11.36), Eu has a significant negative anomaly (0.47-0.62); the rocks enrich large ion lithophile elements (K, Rb, B, Th and Sr), deplete the high field strength elements (Nb, Ta, P and Ti). The above characteristics indicate that the rocks of Aoguotunwulan pluton in South Qilian are I-type granites. Combining with the regional data, it is believed that Aoguotunwulan pulton is formed in the syn-collisional tectonic setting, and is the product of the early period of Early Silurian when the South Qilian ocean is closed, and the continental blocks on both sides collide and enter the collisional orogenic stage.

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备注/Memo

备注/Memo:
收稿日期:2018-02-25;修回日期:2018-07-03
基金项目:中国地质调查局地质调查项目(1212011221151,12120114041301)
作者简介:张新远(1988-),男,青海西宁人,工程师,E-mail:qhddyzxy@qq.com。
更新日期/Last Update: 2018-10-01