攀西裂谷南段水口菁碱性杂岩体磷灰石U⁃Pb年代学和地球化学特征
赵鹏鹏 , 应元灿 , 余海军 , 李文昌 , 蒋少涌
地球科学 ›› 2025, Vol. 50 ›› Issue (08) : 2977 -2992.
攀西裂谷南段水口菁碱性杂岩体磷灰石U⁃Pb年代学和地球化学特征
U⁃Pb Geochronology and Geochemical Characteristics of the Apatite from the Shuikoujing Alkaline Complex in the Southern Panxi Rift
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水口菁碱性杂岩体是攀西裂谷南段出露面积最大的基性⁃超基性环状杂岩体.前人研究认为该杂岩体与晚二叠纪峨眉山大火成岩省岩浆活动紧密相关,但一直缺乏精确的年代学限定,制约了对攀西裂谷南段碱性杂岩体的成因演化及构造动力学背景的认识.在详细的岩相学和地球化学研究基础上,利用LA⁃(MC)⁃ICP⁃MS分析技术对主要副矿物磷灰石开展了U⁃Pb定年、微量元素组成及Sr同位素分析,从而探讨其成因演化和对应的构造动力学背景.结果显示辉长岩和辉石闪长岩中的磷灰石U⁃Pb年龄分别为263±11 Ma和262.8±6.4 Ma,磷灰石原位Sr同位素组成均一(0.704 1~0.704 5)且具有典型的幔源特征.其原始岩浆的形成与峨眉山大火成岩省的活动紧密相关,起源于板内拉张环境下的岩石圈地幔低程度部分熔融,并经历了快速的岩浆分异演化.攀西裂谷南段发育的这些碱性杂岩体很可能是最早期峨眉山大火成岩省初始岩浆演化的产物.
The Shuikoujing alkaline complex, the largest basic⁃ultrabasic complex exposed in the southern Panxi Rift.Previous studies suggest that the complex is closely related to the Late Permian Emeishan Large Igneous Province (ELIP) magmatic activity, but precise geochronological constraints have been lacking, which has hindered the understanding of the genesis, evolution, and tectono⁃dynamic background of the alkaline complex in the southern Panxirift.In this study, based on detailed petrographic and geochemical investigations, using LA⁃(MC)⁃ICP⁃MS analytical techniques to conduct U⁃Pb dating, trace element composition, and Sr isotopic analysis on apatite from various lithologies. These analyses aim to explore the genesis, evolution, and the associated tectono⁃dynamic background of the complex. The results show that the U⁃Pb ages of apatite from the gabbro and pyroxene diorite are 263±11 Ma and 262.8±6.4 Ma,The in situ Sr isotope composition of apatite is uniform (0.704 1~0.704 5) and exhibits typical mantle⁃derived characteristics. Suggesting that the formation of the primary magma is closely related to the activity of the ELIP, originating from low⁃degree partial melting of the lithospheric mantle in an intraplate extensional setting, and subsequently underwent rapid magmatic differentiation and evolution. Additionally, these alkaline complexes in the southern Panxi Rift are inferred to be products of the initial magmatic evolution of the ELIP.
水口菁 / 磷灰石 / 攀西裂谷 / 碱性杂岩体 / 地球化学.
Shuikoujing / apatite / Panxi Rift / alkaline complex / geochemistry
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国家自然科学基金项目(U2344217)
云南省基础研究计划项目(202301CF070317)
云南省有色地质局308队专家工作站项目(2024)
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