Geochemistry, petrogenesis and tectonic setting of the Paleoproterozoic Yanmenguan mafic-ultramafic intrusion in the Hengshan-Wutai-Fuping area
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摘要:
本文对五台地区侵入于原北金岗库组的雁门关镁铁-超镁铁岩体进行了详细的岩石学、矿物学和岩石地球化学分析研究。雁门关岩体在矿物成份上, 特别是单斜辉石、尖晶石和角闪石, 具有阿拉斯加型侵入岩体和俯冲带或弧相关的岩浆特征, 其元素地球化学特征也可与阿拉斯加型侵入杂岩体类比, 具有明显的Nd (Ta), Zr (Hf), Y和Ti负异常。从构造环境判别图来看, 雁门关岩体主要为与俯冲相关的成因, 具大陆边缘弧的性质。因此, 雁门关岩体是侵入在大陆边缘弧环境的岩浆经历了橄榄石和单斜辉石的分离结晶作用的产物。它与恒山-五台-阜平地区广泛分布的同时代花岗岩和火山岩一起, 构成了华北克拉通中部造山带内一期重要的古元古代大陆边缘岛弧岩浆活动。
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关键词:
- 雁门关镁铁-超镁铁质岩体 /
- 古元古代 /
- 岩石成因 /
- 大陆边缘弧 /
- 华北克拉通中部造山带
Abstract:A detailed study of petrology, mineralogy, geochemistry and petrogenesis on the Paleoproterozoic Yanmenguan mafic-ultramafic intrusion in the Hengshan-Wutai-Fuping area is presented here. The intrusion is akin to Alaskan-type or arc-related magmatism in mineral geochemistry, especially in the compositions of spinel, clinopyroxene, and amphibole. The rock geochemistry is also comparative to those of Alaskan-type mafic-ultramafic complexes, as characterized by pronounced Nd (Ta), Zr (Hf), Y and Ti trough in primitive mantle normalized trace element patterns. In trace element discrimination diagrams, the Yanmenguan rocks plot in the field of subduction zone-related magmas, indicating a tectonic setting of continental arc. Therefore, we propose that the magma of the Yanmenguan mafic-ultramafic intrusion originated from lithospheric mantle in a continent marginal arc, and experienced fractional crystallization of olivine and clinopyroxene. This intrusion, together with contemporary granitic and volcanic rocks in this area, signifies an important stage of Paleoproterozoic magmatism developed in continent margin of the Trans-North China Orogen.
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图 1
恒山-五台-阜平地区地质简图 (据Wang et al., 2004)
Figure 1.
Geological map of the Hengshan-Wutai-Fuping area (after Wang et al., 2004)
图 2
雁门关镁铁-超镁铁岩体剖面图 (修改自穆书汉, 1983①)
Figure 2.
Cross section of the Yanemenguan mafic-ultramafic intrusion
图 3
雁门关镁铁-超镁铁岩体代表岩石的显微结构照片
Figure 3.
Typical textures of the Yanmenguan mafic-ultramafic intrusion
图 4
雁门关镁铁-超镁铁岩体矿物化学成分关系图
Figure 4.
Mineral chemical compositions of the Yanmenguan mafic-ultramafic intrusion
图 5
雁门关二辉橄榄岩尖晶石类Cr#-Mg#图 (a) 和Cr-Al-Fe3+(b) 图
Figure 5.
The diagram of Mg/(Mg+Fe2+) vs. Cr/(Cr+Al) (a) and Cr-Al-Fe3+ triangle (b) for spinel in the Yanmenguan peridotites
图 6
雁门关镁铁-超镁铁岩体各岩类中角闪石的成分分类图解 (a, b) 和Si-(Na+K)A图解 (c)
Figure 6.
Composition diagrams of the amphibole (a, b), and plot of Si against cations in A-site of the amphibole (c) in the Yanmenguan mafic-ultramafic intrusion
图 7
雁门关镁铁-超镁铁岩FeOT-MgO-Na2O+K2O图 (a, 据Irvine and Baragar, 1971) 和Al2O3-MgO-CaO图 (b, 据Coleman, 1977)
Figure 7.
The diagrams of FeOT-MgO-Na2O+K2O (a, after Irvine and Baragar, 1971) and Al2O3-MgO-CaO (b, after Coleman, 1977)
图 8
雁门关镁铁-超镁铁岩MgO-其它主量元素协变图
Figure 8.
Plots of MgO vs. other oxides of the Yanmenguan mafic-ultramafic intrusion showing major-element variations with fractional crystallization
图 9
雁门关镁铁-超镁铁岩稀土元素球粒陨石标准化配分图 (a) 和原始地幔标准化微量元素蛛网图 (b)
Figure 9.
C1 chondrite-normalized REE patterns (a) and primitive mantle-normalized trace-element patterns (b) for the Yanmenguan mafic-ultramafic rocks
图 10
Th-Hf-Ta (a, 据Wood, 1980) 和 (La/Sm)CN vs. Nb/La (b, 据John et al., 2003) 判别图解
Figure 10.
Trace element discrimination diagrams of Th-Hf-Ta (a, after Wood, 1980) and (La/Sm)CN vs. Nb/La (b, after John et al., 2003)
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