Geochemical Characteristics and Tectonic Implications of the End Early Permian High Magnesium Gabbro from Northern Beishan Orogenic Belt, Inner Mongolia
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摘要: 在北山造山带北部百合山蛇绿混杂岩带南清河沟-红柳峡地区新识别出一套辉长岩.通过LA-ICP-MS锆石U-Pb定年，全岩主微量及Sr-Nd同位素工作，显示辉长岩侵位于278.2±1.3 Ma，具有高镁（Mg#=55~66）、低钾拉斑-钙碱性的地球化学特征，富集Rb、Ba、Sr等大离子亲石元素，亏损Nb、Ta、Ti等高场强元素.辉长岩εNd（t）介于5.64~6.77，具有较高的Sm/Yb比值，暗示岩浆起源于亏损地幔的部分熔融.较高的Mg#及Cr、Ni含量及Zr、Hf负异常，表明母岩浆经历了有限的分离结晶与地壳混染.结合区域地质资料，认为北山造山带北部增生造山作用结束时限为早-中二叠世，北山造山带古亚洲洋最终闭合可能在中二叠世之后.Abstract: A suite of high-magnesium gabbro is located in the Qinghegou-Hongliuxia area in the southern part of the Baiheshan ophillite mélange belt in the northern Beishan orogenic belt. Based on LA-ICP-MS zircon U-Pb dating, whole-rock geochemical and Sr-Nd isotopic analyses, the gabbro was intruded at 278.2±1.3 Ma and they show high magnesium geochemical characteristic, belonging to low-tholeiite to calc-alkaline series. They are enriched in large-ion lithophile elements of Rb, Ba, Sr and depleted in high field strength elements of Nb, Ta, Ti. The values of εNd(t) of the gabbro vary from 5.64 to 6.77, with high Sm/Yb, implying magma originates from depleted mantle. Relatively high Mg#, Cr, Ni and negative Zr and Hf indicate that the primary magma has undergone limited fractional crystallization and crustal contamination. Combined with regional geological material, it is suggested that the end of the accretionary orogeny is Early to Middle Permian in the northern Beishan orogenic belt. The Paleo-Asian Ocean in the Beishan orogenic belt may have been lasted until or after Middle Permian.
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图 1 北山造山带大地构造位置简图（a）及主要蛇绿岩带分布图（b）（据Xiao et al., 2010；辛后田等，2020）
Fig. 1. Tectonic location (a) and distribution of ophiolites (b) of the Beishan orogenic belt (modified by Xiao et al., 2010; Xin et al., 2020)
图 3 北山造山带北部辉长岩野外露头及显微照片
a. 辉长岩野外露头；b. 辉长岩手标本；c. 辉长岩成分不均一；d. 辉长岩镜下照片（正交偏光）；Cpx.单斜辉石，Pl.斜长石
Fig. 3. Field outcrops and microphotographs of the gabbro from northern Beishan orogenic belt
图 5 北山造山带北部辉长岩原始地幔标准化微量元素蛛网图（a）；球粒陨石标准化稀土元素配分曲线（b）
原始地幔及球粒陨石参考值引自Sun and McDonough（1998）
Fig. 5. Primitive mantle-normalized trace element patterns (a) and chondrite-normalized REE distribution patterns (b) of the gabbro from northern Beishan orogenic belt
图 6 北山造山带北部辉长岩部分锆石阴极发光图像
Fig. 6. CL images of selected zircons of the gabbro from northern Beishan orogenic belt
图 7 北山造山带北部辉长岩锆石U-Pb谐和图与加权平均年龄
Fig. 7. Zircon U-Pb concordia diagrams and weighted mean age of the gabbro from northern Beishan orogenic belt
图 8 北山造山带北部辉长岩(87Sr/86Sr)i-εNd(t)图解（据DePaolo and Wasserburg，1979）
Fig. 8. (87Sr/86Sr)i-εNd(t) diagram of the gabbro from northern Beishan orogenic belt(modified by DePaolo and Wasserburg, 1979)
图 10 北山造山带北部辉长岩Th/Nb-Ta/Nd判别图解（a；Aldanmaz et al., 2008）和Nb/Yb-Th/Yb判别图解（b；Pearce, 2008）
Fig. 10. Th/Nb-Ta/Nd (a; Aldanmaz et al., 2008) and Nb/Yb-Th/Yb (b; Pearce, 2008) diagrams for the gabbro from northern Beishan orogenic belt
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