内蒙古中东部上侏罗统满克头鄂博组划分及时代

张永清

doi:10.3799/dqkx.2020.248

内蒙古中东部上侏罗统满克头鄂博组划分及时代

doi: 10.3799/dqkx.2020.248

张永清^{1, 2,}

1.
内蒙古自治区岩浆活动成矿与找矿重点实验室, 内蒙古呼和浩特 010020
2.
内蒙古自治区地质调查院, 内蒙古呼和浩特 010020

基金项目:

内蒙古区域地质调查片区总结与服务产品开发项目 121201130132001

详细信息

作者简介:
张永清(1961-), 男, 高级工程师, 从事地质调查、矿产勘查及综合研究工作.E-mail:735629926@qq.com

中图分类号: P534
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出版历程
- 收稿日期: 2020-08-21
- 刊出日期: 2021-01-15

Division and Age of the Upper Jurassic Mandetou Orbo Formation in Central and Eastern Inner Mongolia

Zhang Yongqing^{1, 2
,}

1.
Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting, Huhhot 010020, China
2.
Inner Mongolia of Geological Surver, Huhhot 010020, China

摘要

摘要: 内蒙古自治区中东部满克头鄂博组以流纹质火山碎屑岩为主夹山间湖盆相陆相碎屑岩及少量流纹岩或英安岩.沉积岩中产叶肢介Magumbonia paramecia，Nestoria reticulate，N.xishunjingensis，N.cf.pissoui，Lioestheria sp.；双壳类Ferganoconcha curta，F.subcentralis，F.elongate；植物：Ginkgoites sp.，Cladophlebis sp.，Lycopodites sp.，Baiera gracilis，Phoenicopsis sp.化石.岩石化学SiO₂71.47%~75.96%，Ai₂O₃12.50%~14.18%，K₂O 3.84%~4.98%，Na₂O 3.22%~4.14%，ALK 7.84%~9.12%，K₂O>Na₂O，显示高硅高碱特征；微量元素组成上以富集Rb、K、Th、U、La和LREE，亏损Ba、Nb、Sr、P和Ti为特征；稀土元素ΣREE=47.116×10^-6~176.78×10^-6，轻重稀土分溜明显，分溜系数（La/Yb）_N为4.79~25.56，δEu为0.05~0.61，为中等铕负异常.4个样品在logδ-logτ图解上全部落入造山带山花岗岩区、Rb-Y+Nb图解上落在火山弧花岗岩区、Nb-Y图解上全部落入火山弧花岗岩同碰撞花岗岩区；在阿巴嘎旗-扎鲁特旗-巴林右旗一带采集了4个锆石LA-MC-IC-MS同位素，年龄值分别为138.89±0.93 Ma、137.70±1.40 Ma、147.70±1.20 Ma和137.27±0.96 Ma，将满克头鄂博组的时代置于晚侏罗世-早白垩世.
- 内蒙古自治区中东部 /
- 满克头鄂博组 /
- 锆石LA-MC-IC-MS同位素 /
- 晚侏罗世-早白垩世 /
- 地球化学
Abstract: The volcanic rocks in Manketou'ebo Formation, located in the middle east area of Inner Mongolia, are mainly composed of rhyolitic pyroclastic rocks, mixed with intermountain lacustrine facies continental clastic rocks and a small amount of rhyolite or dacite. Sedimentary rocks contain fossils of Estherians (Magumbonia paramecia, Nestoria reticulate, N. xishunjingensis, N. cf. pissoui, Lioestheria sp.), Bivalves (Ferganoconcha curta, F. subcentralis, F. elongate) and vegetation (Ginkgoites sp., Cladophlebis sp., Lycopodites sp., Baiera gracilis, Phoenicopsis sp.). Geochemical study shows that the chemical constitutes of these fossils are SiO₂ 71.47%-75.96%, Ai₂O₃ 12.50%-14.18%, K₂O 3.84%-4.98%, Na₂O 3.22%-4.14% and ALK 7.84%-9.12%, indicating richness in silicon and alkali. In terms of trace elements, all specimens are characterized by high ratio of Rb, K, Th, U, La and LREE, and lack of Ba, Nb, Sr, P and Ti. Rare earth element ΣREE ranges from 118.71×10^-6 to 189.99×10^-6; significant fractionation of HREE and LREE ((La/Yb)_N=4.79-25.56) and moderate negative Eu anomalies (δEu=0.05-0.61) are detected. All 4 specimens, on the basis of the logδ-logτ diagram, are classified into orogenic belt mountain granite area. Meanwhile according to the Rb-Y+Nb diagram, these specimens belong to volcanic arc granite area, and the Nb-Y diagram suggests 4 specimens pertain to the same volcanic arc granite with collision granite area. The ages of 4 zircon LA-MC-IC-MS isotope samples collected from Abagaqi-Zarutqi-Bahrainyouqi are respectively 138.89±0.93 Ma, 137.70±1.40 Ma, 147.70±1.20 Ma and 137.27±0.96 Ma, which therefore suggests that the era of Manketou'ebo Formation lies between Late Jurassic and Early Cretaceous.
- middle east area of Inner Mongolia autonomous region /
- Manketou Ebo Formation /
- zircon LA-MC-IC-MS isotope /
- Late Jurassic-Early Cretaceous /
- geochemistry

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图 1 大兴安岭中南段采样位置及区域地质略图

Fig. 1. Reginal geological sketch and sampling positions middle-south part Da Hinggan Mountains

下载: 全尺寸图片幻灯片

图 2 满克头鄂博组K₂O-SiO₂图解

据Peccerillo and Taylor(1976)；横纵坐标的单位为%

Fig. 2. K₂O-SiO₂ diagram for specimens in Manketou'ebo Formation

下载: 全尺寸图片幻灯片

图 3 满克头鄂博组流纹岩原始地幔标准化微量元素蛛网图(a)和球粒陨石标准化稀土模式图(b)

Fig. 3. Primitive mantle normalized trace element spideriagrams for rhyolite (a) and chondrite-normalized REE pattern for rhyolite chondrite in Manketou'ebo Formation (b)

下载: 全尺寸图片幻灯片

图 4 满克头鄂博组被测锆石CL图像、LA-ICP-MS分析点及U-Pb谐和图

Fig. 4. CL images localities the points LA-ICP-MS measurements and the U-Pb concordia of zircons from the Manketou'ebo Formation

下载: 全尺寸图片幻灯片

图 5 满克头鄂博组构造判别图解

Fig. 5. Tectonic discrimination diagrams of the rhyolite in Manketou'ebo Formation

下载: 全尺寸图片幻灯片

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