In Situ Geochemical and Sr–Nd Isotope Analyses of Apatite from the Shaxiongdong Alkaline–Carbonatite Complex (South Qinling, China): Implications for Magma Evolution and Mantle Source
In Situ Geochemical and Sr–Nd Isotope Analyses of Apatite from the Shaxiongdong Alkaline–Carbonatite Complex (South Qinling, China): Implications for Magma Evolution and Mantle Source
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沙雄洞碱性碳酸盐岩杂岩体（中国南秦岭）磷灰石原位地球化学和稀土同位素分析：对岩浆演化和地幔来源的启示
DOI：
10.3390/min12050587
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发表时间：
2022-05
期刊：
影响因子：
2.5
通讯作者：
Jifeng Ying
中科院分区：
文献类型：
--
作者：
Jian Li;Chenyang Ye;Jifeng Ying
通过对南秦岭碱性碳酸岩侵入体中磷灰石的主量元素、微量元素和Sr-Nd同位素数据的分析，探讨了该侵入体的岩浆演化和地幔来源。沙熊洞杂岩主要由早古生代角闪石岩、霞石正长岩和三叠纪碳酸盐岩组成。所有岩性的磷灰石都是自形到半自形的，属于氟磷灰石。碳酸盐岩和正长岩磷灰石中的RE 3 + + Na+ + Sr 2 + Particip 3Ca 2+，角闪石磷灰石中的Si 4 + + 2Na+ +2S 6 + +4 RE 3 + Particip 4P 5 + +5Ca 2+。磷灰石具有富集稀土元素和亏损高场强元素的特征。它们记录了其母岩浆的独特演化过程。角闪石磷灰石中微弱的负Eu异常，以及岩石中Eu异常的缺乏，表明岩浆相对还原。SXD碳酸盐岩中磷灰石的Sr-Nd同位素数据，落在东非碳酸盐岩线（EACL）和Oldoinyo Lengai碳酸盐岩领域，表明SXD碳酸盐岩来自混合地幔源组成的HIMU组件和俯冲沉积碳酸盐。SXD角闪石岩和正长磷灰石与SQB中早古生代镁铁质-超镁铁质岩墙的Sr、Nd同位素组成的相似性表明，它们可能具有共同的交代岩石圈地幔源区。
We present in situ major element, trace element, and Sr–Nd isotope data of apatite from an alkaline–carbonatite intrusion in the South Qinling Belt (SQB) to investigate their magma evolution and mantle sources. The Shaxiongdong (SXD) complex consists predominantly of the early Paleozoic hornblendite, nepheline syenite, and subordinate Triassic carbonatite. Apatites from all lithologies are euhedral to subhedral and belong to fluorapatite. Elemental substitution varies from REE3+ + Na+ + Sr2+ ↔ 3Ca2+ in carbonatite and syenite apatite to Si4+ + 2Na+ + 2S6+ + 4REE3+ ↔ 4P5+ + 5Ca2+ in hornblendite apatite. Apatites are characterized by enriched rare earth elements (REEs) and depleted high field strength elements (HFSEs). They record the distinct evolution of their parental magmas. The weak, negative Eu anomaly in hornblendite apatite, together with the lack of Eu anomalies in the bulk rocks, indicates a relatively reduced magma. The Sr–Nd isotope data of the apatite in SXD carbonatite, falling on the East African carbonatite line (EACL) and close to the field of Oldoinyo Lengai carbonatite, indicate that the SXD carbonatite is derived from a mixed mantle source consisting of the HIMU component and subducted sedimentary carbonates. The similarity in Sr and Nd isotopic compositions between the SXD hornblendite and syenite apatites and the early Paleozoic mafic-ultramafic dykes in the SQB suggests that they may share a common metasomatized lithospheric mantle source.
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影响因子：
3.9
作者：
A. Williams-Jones;D. Palmer
通讯作者：
A. Williams-Jones;D. Palmer
影响因子：
3.9
作者：
Yue-heng Yang;Fu-Yuan Wu;S. Wilde;Xiaoming Liu;Y. Zhang;Liewen Xie;Jin-Hui Yang
通讯作者：
Yue-heng Yang;Fu-Yuan Wu;S. Wilde;Xiaoming Liu;Y. Zhang;Liewen Xie;Jin-Hui Yang
影响因子：
3.9
作者：
K. Bell
通讯作者：
K. Bell
放射性Pb储层有助于南秦岭碳酸岩稀土元素（REE）富集
影响因子：
3.9
作者：
Chen Wei;Lu Jue;Jiang Shao-Yong;Ying Yuan-Can;Liu Yong-Sheng
通讯作者：
Liu Yong-Sheng
影响因子：
--
作者：
Youxue Zhang;H. Ni;Yang Chen
通讯作者：
Youxue Zhang;H. Ni;Yang Chen