| 新疆昌吉南部侏罗系头屯河组物源与沉积环境分析 |
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| 引用本文： | 罗居德,刘云华,夏昭德,汪帮耀,范媛媛.新疆昌吉南部侏罗系头屯河组物源与沉积环境分析[J].地质与资源,2022,31(4):473-485. |
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| 作者姓名： | 罗居德 刘云华 夏昭德 汪帮耀 范媛媛 |
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| 作者单位： | 长安大学 地球科学与资源学院, 陕西 西安 710054 |
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| 基金项目： | 中国地质调查局地质调查项目"新疆昌吉地区K45E001012等六幅1:5万区域地质调查"(2019-002). |
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| 摘 要： | 在野外勘察和实测剖面的基础上，运用粒度分析、碳氧同位素分析及多碎屑三角端元分析等方法，对新疆昌吉南部侏罗系头屯河组进行研究.认为头屯河组主要发育辫状河三角洲前缘亚相以及滨浅湖亚相.碳氧同位素样品结果显示13CV-PDB值均在-9‰~-17.3‰之间，平均-13.275‰，18OV-PDB值在-14.2‰~-16.2‰之间，平均-15.425‰，18OV-SMOW值在-14.2‰~-16.3‰之间，平均-15.05‰，表明头屯河组砂岩形成于大气淡水成岩环境.成岩压实的温度范围为99.26~114.1℃，埋深在4.34~5.23 km之间，平均4.87 km.物源分析反映其主要为隆升基底、岛弧造山带的构造背景，并在沉积后期显示为混合物源区.侏罗纪沉积环境由潮湿型气候逐渐向干旱型气候转变，在头屯河组沉积时期，沉积环境发生多次弱还原-弱氧化环境与较强氧化环境之间的交替转换.
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| 关 键 词： | 头屯河组 侏罗纪 沉积相 沉积环境 新疆 |
| 收稿时间： | 2021-05-21 |
SOURCE AND SEDIMENTARY ENVIRONMENT OF JURASSIC TOUTUNHE FORMATION IN SOUTHERN CHANGJI,XINJIANG |
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| LUO Ju-de,LIU Yun-hua,XIA Zhao-de,WANG Bang-yao,FAN Yuan-yuan.SOURCE AND SEDIMENTARY ENVIRONMENT OF JURASSIC TOUTUNHE FORMATION IN SOUTHERN CHANGJI,XINJIANG[J].Geology and Resources,2022,31(4):473-485. |
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| Authors: | LUO Ju-de LIU Yun-hua XIA Zhao-de WANG Bang-yao FAN Yuan-yuan |
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| Institution: | School of Earth Sciences and Resources, Chang'an University, Xi'an 710054, China |
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| Abstract: | The methods of particle analysis, carbon-oxygen isotope and polyclastic triangular end member analysis are used to study the Jurassic Toutunhe Formation in southern Changji of Xinjiang based on field survey and section measuring. It is considered that the braided river delta front subfacies and shore shallow lake subfacies are mainly developed in Toutunhe Formation. The analysis results of carbon and oxygen isotope samples indicate that the sandstones of Toutunhe Formation were formed in meteoric freshwater diagenetic environment, with the compaction temperature of 99.26-114.1℃ and burial depth of 4.34-5.23 km (averagely 4.87 km). The provenance analysis reflects the tectonic setting of uplifted basement and island arc orogenic belt, showing mixed source in the late sedimentary stage. The Jurassic sedimentary environment changed from moist to arid climate, and alternated between weak reduction-weak oxidation and strong oxidation environment repeatedly during the sedimentary period of Toutunhe Formation. |
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| Keywords: | Toutunhe Formation Jurassic sedimentary facies sedimentary environment Xinjiang |
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