Two Triassic magmatic activities in Binbalechagan area of Dong Ujimqin Banner, Inner Mongolia: Geochronologic record, petrogenesis and tectonic settings
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摘要:
内蒙古东乌旗宾巴勒查干分布有大面积三叠纪花岗岩，是研究中亚造山带中东部早中生代构造演化的有利地区。在区域地质调查的基础上，利用同位素年代学在该区识别出三叠纪两期侵入岩：中三叠世二长花岗岩类（238~230 Ma）和晚三叠世正长花岗岩类（223~215 Ma）。采用矿物化学、岩石地球化学等方法对两类侵入岩进行了研究：前者中黑云母为镁质黑云母，岩石以高硅、富钾、过铝、钙碱性为特征，稀土元素中轻稀土相对富集、具明显的负Eu异常，微量元素以相对富集大离子亲石元素、具明显的Ba负异常为特征，地球化学特征介于I型和A型花岗岩之间；后者中黑云母由镁质黑云母向铁质黑云母转变，岩石以高硅、富碱、富钾、弱过铝为特征，稀土、微量元素特征与前者相似，但稀土总量相对较低，Eu、Ba的负异常程度更大，属A型花岗岩。二者可能源于年轻幔源组分形成下地壳的部分熔融。结合区域资料分析，研究区三叠纪侵入岩形成于古亚洲洋闭合背景下，中三叠世时可能处于后造山伸展背景，晚三叠世可能为板内构造背景。
Abstract:Triassic intrusive rocks (TIRs) are widespread in Binbalechagan area of Dong Ujimqin Banner in Inner Mongolia, and hence this area has advantage of studying Early Paleozoic evolution of central-east segment of Central Asia Orogenic Belt (CAOB). Based on regional geological survey, the authors recognized two Triassic magmatic activities by evidence from geochronology:mid-Triassic adamellites (with isotope ages of 238-230 Ma) and late-Triassic syenogranites (with isotope ages from 223 to 215 Ma). The former rocks whose geochemical features are between I-type and A-type granites are characterized by magnesia biotite, high silicon, rich K, peraluminum and calc-alkaline nature, abundant light rare earth elements and large ion lithophile elements, and significant negative Eu and Ba anomalies. However, the latter rocks belong to A-type granites and are characterized by high silicon, enriched alkali, abundant K and, weak peraluminum nature. Otherwise, total REE in the latter is lower, and negative anomaly degrees of Eu and Ba in the latter are more obvious than those of the former. These TIRs probably originated from partial melting of the lower crust which consisted of newly derived mantle. In combination with regional information, it can be concluded that the TIRS was formed after the closure of the Paleo-Asian Ocean. In mid-Triassic, the study area probably was in post-orogenic background, and hence this area was mainly in an intraplate tectonic setting in late Triassic.
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致谢: 与昆明理工大学刘学龙博士进行的有益讨论给予了笔者启发，尹海龙、黄烈工程师协助完成了野外工作，长安大学向坤鹏博士在写作中提供了帮助，中国地质科学院地质研究所张洪瑞博士认真审阅了全文并提出了建设性的修改意见，在此一并致以诚挚的谢意。
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图 1 内蒙古东乌旗宾巴勒查干一带地质简图示三叠纪侵入岩的分布
a-底图据文献[1]修改；b-据❶❷修改
1-第四系；2-白垩系；3-侏罗系；4-三叠系；5-泥盆系；6-侏罗纪侵入岩；7-三叠纪中细粒似斑状正长花岗岩；8-三叠纪细粒似斑状正长花岗岩；9-三叠纪粗中粒正长花岗岩；10-三叠纪粗中粒二长花岗岩；11-石炭-二叠纪侵入岩；12-脉岩；13-侵入界线或第四系界线；14-角度不整合界线；15-同位素样品采集点。图中7~10为本文的研究对象Figure 1. Sketch geological map of Binbalechagan area in Dong Ujimqin Banner, Inner Mongolia, showing distribution of Triassic intrusive rocks
a-Reproduction modified after reference [1]; b-modified after reference ❶❷
1-Quaternary; 2-Cretaceous; 3-Jurassic; 4-Triassic; 5-Devonian; 6-Jurassic intrusive rocks; 7-Triassic medium-fine grained porphyry syenogranite; 8-Triassic fine grained porphyry syenogranite; 9-Triassic coarse-medium grained syenogranite; 10-Triassic coarse-medium grained ademallite; 11-Carboniferous -Permian intrusive rocks; 12-Veins; 13-Intrusive boundary or boundary between Quaternary and other rocks; 14-Angular unconformity; 15-Isotope sampling site. No. 7-10 above are the objects of this study![]()
图 2 三叠纪细粒似斑状正长花岗岩侵入三叠系哈达陶勒盖组安山岩
Figure 2. Triassic fine grained porphyry syenogranite that intruded into andesites of Triassic Hadataolegai Formation
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图 3 三叠纪中细粒似斑状正长花岗岩侵入三叠纪粗中粒正长花岗岩
Figure 3. Triassic medium-fine grained porphyry syenogranite that intruded into Triassic coarse-medium grained syenogranite
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图 4 宾巴勒查干三叠纪花岗岩典型锆石阴极发光图像、谐和图及直方图
Figure 4. Cathodoluminescence images of typical zircons, concordia diagram and histogram of U-Pb SHRIMP data of zircons from Triassic intrusive rocks in Binbalechagan
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图 5 宾巴勒查干三叠纪花岗岩显微照片示黑云母特征（单偏光）
寄主岩石：a-粗中粒二长花岗岩；b-粗中粒正长花岗岩；c-细粒似斑状正长花岗岩；d-中细粒似斑状正长花岗岩
Figure 5. Microscope photographs of Triassic intrusive rocks in Binbalechagan, showing characteristics of biotites
Host rock: a-Coarse-medium grained ademallite; b-Coarse-medium grained syenogranite; c-Fine grained porphyry syenogranite; d-Mediumfine grained porphyry syenogranite
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图 7 宾巴勒查干三叠纪侵入岩岩石类型和系列划分图解
a-TAS图解（据文献[34]）; b-SiO2-K2O分类图解（据文献[35]）; c-A/NK-A/CNK图解（据文献[36]）; d-(Na2O+K2O-CaO)-SiO2图解（据文献[37]）
Figure 7. Classification and series diagrams of Triassic intrusive rocks in Binbalechagan
a-Total alkalis versus silica diagram (after reference [34]); b-K2O versus SiO2 diagram (after reference [35]); c-A/NK versus A/CNK diagram (after reference [36]); d-(NaO2+K2O-CaO) versus SiO2 diagram (after reference [37])
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图 8 宾巴勒查干三叠纪侵入岩地球化学图谱
a、c标准化数值据文献[38]；b、d标准化数值据文献[39]；图中文献[30]的数据为国家地质测试中心分析结果，用于验证本次数据的可靠性
Figure 8. REE patterns (a, c) and trace element spider diagram (b, d) of Triassic intrusive rocks in Binbalechagan
Normalization values are from reference [38] and reference [39], respectively. Data of reference [30] analyzed by NRCGA (National Research Center for Geoanalysis) aiming to verify the reliability of data in this paper
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图 9 宾巴勒查干三叠纪侵入岩分类图解
a-SiO2-Zr分类图解（据文献[44]）; b-(Zr+Nb+Ce+Y) -(Na2O + K2O)/ CaO图解（据文献[45]）；FG-分异的长英质花岗岩；OGT-未分异的I、S、M型花岗岩
Figure 9. Classification diagrams of Triassic intrusive rocks in Binbalechagan
a-SiO2 versus Zr diagram (after reference [44]); b-(Zr+Nb+Ce+Y) versus (Na2O + K2O)/ CaO diagram (after reference [45]); FG-Fractionated felsic granites; OGT-Unfractionated I-, S-and M-type granites
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表 1 内蒙古东乌旗宾巴勒查干三叠纪侵入岩锆石U-Pb测试结果
Table 1 Zircon U-Pb isotope data of Triassic intrusive rocks from Binbalechagan, Dong Ujimqin Banner, Inner Mongolia
下载: 导出CSV
表 2 内蒙古东乌旗宾巴勒查干三叠纪侵入岩中黑云母电子探针测试分析数据
Table 2 Electron microprobe analyses of biotites from Triassic intrusive rocks of Binbalechagan in Dong Ujimqin Banner, Inner Mongolia
下载: 导出CSV
表 3 内蒙古东乌旗宾巴勒查干三叠纪侵入岩主量元素（%）、稀土元素（10-6）、微量元素分析结果（10-6）
Table 3 Analytical results of major elements (%), trace elements (10-6) and REE (10-6) of Triassic intrusive rocks from Binbalechagan in Dong Ujimqin Banner, Inner
下载: 导出CSV
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