Subduction-related metasomatism of the lithospheric mantle beneath the southeastern North China Craton: Evidence from mafic to intermediate dykes in the northern Sulu orogen
Subduction-related metasomatism of the lithospheric mantle beneath the southeastern North China Craton: Evidence from mafic to intermediate dykes in the northern Sulu orogen
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华北克拉通东南部岩石圈地幔与俯冲相关的交代作用：苏鲁造山带北部镁铁质岩脉到中间岩脉的证据
DOI：
10.1016/j.tecto.2015.07.037
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发表时间：
2015-09
期刊：
影响因子：
2.9
通讯作者：
Zhaochu Hu
中科院分区：
文献类型：
--
作者：
M. Santosh;Fang-Fang Hu;Kui-Feng Yang;Zhaochu Hu
北方苏鲁造山带广泛分布的基性岩脉对地幔源区特征和地球动力学背景具有重要的制约作用。在这里，我们提出的LA-ICPMS锆石U-Pb年龄表明，岩墙侵位在早白垩世（~ 113-108 Ma）。岩石显示SiO2在46.2至59.5重量%的范围内以及与高浓度MgO（高达7.6重量%）的碱性和钾玄石亲和性，Cr（高达422 ppm）和Ni（高达307 ppm）。它们富集轻稀土元素LREE（La、Ce、Pr、Nd、Sm、Eu）和大离子亲石元素LILE、Rb、Sr、Ba、U、Th，强烈亏损高场强元素HFSE、Nb、Ta、Ti、P。岩墙具有一致的高（87 Sr/86 Sr）i（0.70824-0.70983）、低εNd（t）（− 14.0-− 17.4）和（206 Pb/204 Pb）i（16.66-17.02）以及负εHf（t）（− 23.5-− 13.7）。我们的研究结果表明，源岩浆在上升过程中没有经历任何显着的地壳混染。MgO与主量元素和微量元素之间的系统变化趋势表明橄榄石和单斜辉石的分馏作用。这些岩石的高富集地幔源可能来自扬子板块俯冲下地壳的熔体，它交代了华北板块古老的岩石圈地幔。
The widespread mafic to intermediate dykes in the northern Sulu orogen provide important constrains on mantle source characteristics and geodynamic setting. Here we present LA-ICPMS zircon U–Pb ages which indicate that the dykes were emplaced during Early Cretaceous (~ 113–108 Ma). The rocks show SiO2in the range of 46.2 to 59.5 wt.% and alkalic and shoshonitic affinity with high concentrations of MgO (up to 7.6 wt.%), Cr (up to 422 ppm) and Ni (up to 307 ppm). They are enriched in light rare earth elements LREE (La, Ce, Pr, Nd, Sm and Eu) and large ion lithophile elements (LILE, Rb, Sr, Ba, U and Th) and show strong depletion in high field strength elements (HFSE, Nb, Ta, Ti and P). The dykes possess uniformly high (87Sr/86Sr)i(0.70824–0.70983), low εNd(t) (− 14.0 to − 17.4) and (206Pb/204Pb)i(16.66–17.02) and negative εHf(t) (− 23.5 to − 13.7). Our results suggest that the source magma did not undergo any significant crustal contamination during ascent. The systematic variation trends between MgO and major and trace elements suggest fractionation of olivine and clinopyroxene. The highly enriched mantle source for these rocks might have involved melts derived from the subducted lower crust of Yangtze Craton that metasomatized the ancient lithospheric mantle of the North China Craton.
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DOI：
10.1016/0168-9622(86)90054-0
发表时间：
1986
期刊：
Chemical Geology: Isotope Geoscience Section
影响因子：
--
作者：
Z. Peng;R. Zartman;K. Futa;D. G. Chen
通讯作者：
Z. Peng;R. Zartman;K. Futa;D. G. Chen
影响因子：
3.9
作者：
Jin-Hui Yang;Sun‐Lin Chung;S. Wilde;Fu-Yuan Wu;M. Chu;C. Lo;H. Fan
通讯作者：
Jin-Hui Yang;Sun‐Lin Chung;S. Wilde;Fu-Yuan Wu;M. Chu;C. Lo;H. Fan
成矿与克拉通破坏：华北克拉通的记录
影响因子：
3.3
作者：
Sheng-Rong Li, M. Santosh
通讯作者：
Sheng-Rong Li, M. Santosh
影响因子：
5.3
作者：
STEIGER, RH;JAGER, E
通讯作者：
JAGER, E
影响因子：
1.8
作者：
V. Girardi;W. Teixeira;M. Mazzucchelli;P. C. C. D. Costa-P.-C.-C.-D.-Costa-145919449
通讯作者：
V. Girardi;W. Teixeira;M. Mazzucchelli;P. C. C. D. Costa-P.-C.-C.-D.-Costa-145919449