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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第47卷

期数:

2025年第02期

页码:

176-198

栏目:

基础地质与矿床地质

出版日期:

2025-03-15

文章信息/Info

Title:

Petrogenesis and Geological Significance of Rapakivi-textured Granodiorite from Dangjiasi Pluton in the Northern Margin of Gonghe Basin, Qinghai, China

文章编号:

1672-6561(2025)02-0176-23

作者:

李 伟¹; 段丰浩²; 3*; 支 倩⁴; 彭南赫¹; 王盼龙¹; 王 芊¹; 彭建兵²; 3

(1. 长安大学 地球科学与资源学院,陕西 西安 710054; 2. 长安大学 地质工程与测绘学院,陕西 西安 710054; 3. 长安大学 陕西省黄河科学研究院,陕西 西安 710054; 4. 陕西省地质调查院 陕西省水工环地质调查中心,陕西 西安 710068)

Author(s):

LI Wei¹;  DUAN Feng-hao²; 3*;  ZHI Qian⁴;  PENG Nan-he¹;  WANG Pan-long¹;  WANG Qian¹;  PENG Jian-bing²; 3

(1. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 2. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China; 3. Academy of Yellow River Sciences of Shaanxi Province, Chang'an University, Xi'an 710054, Shaanxi, China; 4. Shaanxi Hydrogeological, Engineering and Environment Geological Survey Center, Shaanxi Institute of Geological Survey, Xi'an 710068, Shaanxi, China)

关键词:

地球化学;  锆石U-Pb年龄;  花岗闪长岩;  岩石成因;  中三叠世;  岩浆混合;  共和盆地

Keywords:

geochemistry;  zircon U-Pb age;  granodiorite;  petrogenesis;  Middle Triassic;  magma mixing;  Gonghe Basin

分类号:

P581; P597⁺.3

DOI:

10.19814/j.jese.2025.01023

文献标志码:

A

摘要:

青海共和盆地周缘广泛发育晚二叠世—三叠纪岩浆岩,其形成时代和岩石成因与宗务隆洋俯冲-碰撞过程密切相关。以龙羊峡水库北侧当家寺岩体中新发现的环斑结构花岗闪长岩及其闪长质包体为研究对象,对其开展岩相学、地球化学和锆石U-Pb年代学研究。结果表明:环斑结构花岗闪长岩LA-ICP-MS锆石U-Pb年龄为(245.8±1.3)Ma; 环斑结构花岗闪长岩属高钾钙碱性弱过铝质I型花岗岩,具有较高的SiO₂质量分数(65.9%～71.1%)和Mg^#值(44.6～49.6),富集Rb、K、Th、U等大离子亲石元素和轻稀土元素,亏损Nb、Ta、Ti,中等Eu负异常(0.46～0.73)等特征; 微量元素特征和矿物不平衡结构(环斑长石、长石熔蚀现象和角闪石包裹斜长石)表明,环斑结构花岗闪长岩主要源自镁铁质下地壳部分熔融并伴有幔源组分参与; 闪长质包体呈不规则椭球状,发育淬冷边和针状磷灰石,具有更低的SiO₂质量分数(61.9%～63.4%)、更高的Mg^#值(57.4～59.4)和更平坦的稀土元素配分模式,暗示当家寺岩体环斑结构花岗闪长岩和闪长质包体是幔源高温岩浆与下地壳玄武质岩石部分熔融产生的长英质岩浆不同比例混合形成的。结合前人研究成果认为,共和盆地北缘中三叠世岩浆活动与宗务隆洋南向俯冲诱发的幔源岩浆底侵和壳幔岩浆混合作用有关。

Abstract:

Late Permian-Triassic igneous rocks are widely developed around Gonghe Basin, and their age and petrogenesis are genetically linked to the subduction-collision process of Zongwulong ocean. Based on the newly discovered rapakivi-textured granodiorites and their dioritic enclaves within Dangjiasi pluton in the north side of Longyangxia reservoir, an integration of methods including petrology, geochemistry and geochronology was performed. The results show that LA-ICP-MS zircon U-Pb age of rapakivi-textured granodiorite is(245.8±1.3)Ma; the rapakivi-textured granodiorites are high-K calc-alkaline weakly peraluminous I-type granites, which exhibit slightly high SiO₂ contents(65.9%-71.1%)and Mg^# values(44.6-49.6); they are also characterized by enrichment of LILEs(Rb, K, Th, U)and LREEs, depletion of HREEs and HFSEs(Nb, Ta, Ti), and moderate negative Eu anomalies(0.46-0.73); their trace element characteristics, coupled with disequilibrium textures of rapakivi feldspar, dissolution of feldspar and plagioclase enclosed within amphibole, indicate that the rapakivi-textured granodiorites are mainly derived from partial melting of mafic lower crust with additional input of mantle-derived component; the dioritic enclaves are irregularly ellipsoidal in shape, and develop chilled border and acicular apatites; they also possess lower SiO₂ contents(61.9%-63.4%), higher Mg^# values(57.4-59.4), and flatter rare earth element(REE)patterns; in combination with field and petrological observations and geochemical characteristics, the rapakivi-textured granodiorites and dioritic enclaves are inferred as products by different percentage mixing of mantle-derived magma and basaltic lower crust-derived felsic magmas. In general, the Middle Triassic magmatic activity in the northern margin of Gonghe Basin might be related to the underplating of mantle-derived magma and magma mixing induced by the southward subduction of Zongwulong ocean.

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备注/Memo

备注/Memo:

收稿日期:2025-01-12; 修回日期:2025-03-10
基金项目:陕西省自然科学基础研究计划项目(2024JC-YBQN-0324,2024JC-YBQN-0292); 国家自然科学基金项目(42041006); 长安大学中央高校基本科研业务费专项资金项目(300102264907)
*通信作者:段丰浩(1991-),男,甘肃天水人,讲师,理学博士,博士后,E-mail:chddfh@163.com。

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