Postdated melting of subcontinental lithospheric mantle by the Emeishan mantle plume: Evidence from the Anyi intrusion, Yunnan, SW China
Postdated melting of subcontinental lithospheric mantle by the Emeishan mantle plume: Evidence from the Anyi intrusion, Yunnan, SW China
复制标题
峨眉山地幔柱对次大陆岩石圈地幔的后期熔融作用：来自中国云南安义岩体的证据
DOI：
10.1016/j.oregeorev.2013.08.006
复制
发表时间：
2014-03
影响因子：
3.3
通讯作者：
Li Xiao-Biao
中科院分区：
文献类型：
--
作者：
Yu Song-Yue;Song Xie-Yan;Chen Lie-Meng;Li Xiao-Biao
The Anyi intrusion is located in the central zone of Emeishan large igneous province (ELIP), SW China. It outcrops in an area of about 0.65 km2and ~ 1 km thick and dips to the southwest. The Anyi intrusion consists of a lower clinopyroxenite zone, middle gabbro zone, and an upper monzonite–syenite zone. Up to 400 m thick stratiform disseminated Fe–Ti oxide layer with grades of 16–18 wt.% total Fe is hosted in the lower clinopyroxenite zone. Zircon SHRIMP U–Pb age (247 ± 3 Ma) indicates that the Anyi intrusion represents postdated mafic magmatism resulting from the ~ 260 Ma Emeishan mantle plume. Compared with the typical oxide-bearing intrusions (such as Panzhihua and Baima) formed at ~ 260 Ma in the ELIP, the Anyi intrusion is characterized by high alkaline contents and LREE/HREE ratios, extremely lowεNd values (− 6.2 to − 7.6) and moderate high (87Sr/86Sr)ivalues (0.7072 to 0.7086). These characteristics of the Anyi intrusion cannot be explained by fractional crystallization or crustal contamination, but may reflect a unique enriched continental lithospheric mantle source (a mantle source mixed between garnet pyroxenite and spinel peridotite). We propose that the postdated mafic magmatism associated with the formation of the Anyi intrusion and its Fe–Ti oxide ore may be the product of melting of a mantle source mixed between garnet pyroxenite and spinel peridotite in the shallow lithosphere caused by conductive heating combined with lithosphere thinning due to plume–lithosphere interaction.
登录
查看更多内容
影响因子：
0.8
作者：
Hong‐fu Zhang;M. Sun;F. Lu;Xin-hua Zhou;Mei‐Fu Zhou;Yongshun Liu;Guohui Zhang
通讯作者：
Hong‐fu Zhang;M. Sun;F. Lu;Xin-hua Zhou;Mei‐Fu Zhou;Yongshun Liu;Guohui Zhang
影响因子：
3.9
作者：
S. Klemme;D. Günther;K. Hametner;Stefan Prowatke;T. Zack
通讯作者：
S. Klemme;D. Günther;K. Hametner;Stefan Prowatke;T. Zack
影响因子：
--
作者：
O. Marghitu;C. Bunescu;T. Karlsson;B. Klecker;H. Stenbaek-Nielsen
通讯作者：
O. Marghitu;C. Bunescu;T. Karlsson;B. Klecker;H. Stenbaek-Nielsen
影响因子：
5.3
作者：
C. Class;S. Goldstein
通讯作者：
C. Class;S. Goldstein
影响因子：
56.9
作者：
RICHARDS, MA;DUNCAN, RA;COURTILLOT, VE
通讯作者：
COURTILLOT, VE