The Whole⁃Rock Sr⁃Nd⁃Li Isotopic Characteristics and Genesis of the Triassic Jiefangyingzi Pluton in the Southeastern Margin of the Central Asian Orogenic Belt
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摘要: 中亚造山带东南缘三叠纪花岗岩类型多样且成因复杂，为研究其物源及形成背景，本文选取解放营子岩体不同位置的二长花岗岩、片麻状似斑状花岗岩和闪长玢岩，并对其进行全岩地球化学、锆石年代学及全岩Sr-Nd-Li同位素分析.锆石U-Pb年代学结果显示解放营子岩体不同类型的岩石均形成于晚三叠世（234~226 Ma）.地球化学特征表明岩体为经历不同程度结晶分异作用的I型花岗岩.略负到正的ɛNd（t）值（-3.9~+1.5）指示它们主要来源于新生地壳，且源区有不同程度古老地壳物质的加入.为了进一步示踪再循环物质对岩浆源区的贡献，本文首次报到了该地区岩体的全岩Li同位素特征，δ7Li值变化范围为+1.1~+6.6‰，平均值为+3.37‰，接近上地幔平均值，表明有显著幔源组分的贡献.结合区域地质特征，晚三叠世解放营子岩体为未明显受再循环物质作用的幔源组分在造山后伸展背景下发生部分熔融形成，且岩浆源区有古老陆壳组分的加入.Abstract: The Triassic granites in the southeastern margin of the Central Asian Orogenic Belt are of diverse types and complex genesis. In order to study their provenance and formation setting, we selected monzogranite, gneissic porphyritic granite and diorite porphyrite in the different locations of the Jiefangyingzi pluton, and performed the whole-rock elemental and Sr-Nd-Li isotope analyses, and zircon geochronology. Zircon U-Pb geochronology results show that the different rock types of the Jiefangyingzi pluton were similarly formed in the Late Triassic (234-226 Ma). Geochemical characteristics show that all of them are I-type granites undergoing different degrees of fractionation crystallization. Slightly negative to positive ɛNd(t) values (-3.9-+1.5) indicate that they derived from juvenile materials with the addition of ancient crustal materials to varying degrees. The whole-rock Li isotopic characteristics of pluton in this region are reported for the first time. The range of δ7Li value is +1.1- +6.6‰ with an average value of +3.37‰, similar to the average value of upper mantle, indicating that there is a significant contribution of mantle-derived components. Combined with regional geology, the Jiefangyingzi pluton was formed in the post-orogenic extension stage after the closure of the Paleo-Asian Ocean. Decompression melting induced the partial melting of the juvenile mantle-derived components without obvious water-rock interaction related to the early subduction process.
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Key words:
- Southeast margin of Central Asian Orogenic Belt /
- Triassic /
- post-orogeny /
- Li isotope /
- geochemistry
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图 1 中亚造山带简图(a)，中亚造山带东南缘构造单元划分简图(b)，研究区地质图(c)
图a修改自Jahn et al.（2000）；图b修改自Jian et al.（2010）；图c据内蒙古自治区地质矿产局，1991，内蒙古地质矿产局1∶20万地质图
Fig. 1. Schematic diagram of Central Asian Orogenic Belt (CAOB) (a); division of tectonic units in the southeastern margin of the CAOB (b); geological map of the study area (c)
图 2 解放营子岩体不同类型岩石岩体镜下及手标本照片
a.二长花岗岩；b.片麻状似斑状花岗岩；c.闪长玢岩. Qtz.石英；Pl.斜长石；Mc.微斜长石；Bt.黑云母；Amp.角闪石
Fig. 2. Photomicrographs and photographs of the rocks of Jiefangyingzi pluton
图 3 解放营子岩体不同类型岩石锆石CL图像
a.闪长玢岩；b.片麻状似斑状花岗岩；c.二长花岗岩
Fig. 3. The CL images of zircon grains from different types of rock of the Jiefangyingzi pluton
图 4 解放营子闪长玢岩(a)、片麻状似斑状花岗岩(c)、二长花岗岩(e)的U-Pb年龄谐和图及加权平均年龄(b, d, f)
Fig. 4. U-Pb concordia of the zircons from Jiefangyingzi diorite porphyrite (a), gneissic porphyritic granite (c), monzogranite (e) and their weighted average diagrams (b, d, f)
图 5 三叠纪解放营子岩体主量元素(a和b)、微量元素(c,d,f)及稀土元素特征(e)
解放营子中三叠世后碰撞花岗岩类数据自Liu et al (2012);图a据Middlemost(1994);图b据Frost and Fost(2008);图c和d据Whalen et al.(1987);球粒陨石和原始地幔标准值来自SunandMcDonough(1989)
Fig. 5. Characteristics of major elements (a and b), trace elements (c, d, f) and rare earth elements (e) of the rocks
表 4 赤峰东北部晚三叠世解放营子岩体全岩Li同位素测试结果
Table 4. Whole rock Li isotope results of Late Triassic felsic magmatic rocks in northeastern Chifeng
样品 岩体 岩性 Li (10‒6) δ7Li (‰) 17CF-17.1 解放营子 片麻状似斑状花岗岩 32.8 1.1 17CF-18.3 解放营子 闪长玢岩 18.3 2.4 17CF-22.5 解放营子 二长花岗岩 26.1 6.6 
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表 5 地壳不同层位平均Li含量及同位素组成
Table 5. Average Li content and isotopic composition in different layers of the crust
层位 同位素(‰)（平均值） 浓度(10‒6)
（平均值）样品来源 参考文献 上
地
壳0±2 (1σ) 35±11 (2σ) 北美、中国、欧洲、澳大利亚和新西兰51个样品的页岩、黄土、花岗岩和上地壳复合物（共51件） Teng et al., 2004 +0.6±0.6 (2σ) 30.5± 3.6 (2σ) 世界多个地区（欧洲、阿根廷、中国和塔吉克斯坦）的沙漠和冰缘黄土沉积物（风沙） Sauzéat et al., 2015 中地壳 +4.0±1.4 12 浓度：平均中地壳成分
同位素组成：高级变质地体（中国东部，华北（八个地点），华南（一个地点）；太古代）浓度：Rudnick and Gao (2003)同位素：Teng et al., 2008 下地壳 2.5 8 同位素组成：8件达到矿物间同位素平衡的麻粒岩相捕虏体；
浓度：所有麻粒岩相捕虏体数据，包括全岩（44）和矿物（29，辉石、长石）麻粒岩相捕虏体来自澳洲（Chudleigh and McBride suites）、华北（汉诺坝）Teng et al., 2008 整个地壳 1.2 18 上、中、下地壳数据结合 Teng et al., 2008
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