| 准噶尔盆地下二叠统风城组硅硼钠石发育特征及其富集成因探讨 |
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| 引用本文： | 赵研,郭佩,鲁子野,郑荣才,常海亮,王国芝,魏研,文华国.准噶尔盆地下二叠统风城组硅硼钠石发育特征及其富集成因探讨[J].沉积学报,2020,38(5):966-979. |
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| 作者姓名： | 赵研 郭佩 鲁子野 郑荣才 常海亮 王国芝 魏研 文华国 |
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| 作者单位： | 1.成都理工大学沉积地质研究院，成都 610059 |
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| 基金项目： | 国家自然科学基金项目41572097, 41472088教育部高等学校博士学科点专项科研基金20135122110004 |
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| 摘 要： | 准噶尔盆地玛湖凹陷下二叠统风城组沉积于火山—碱湖蒸发环境中，发育有厚层碱盐和优质烃源岩，同时还发育世界罕见的硅硼钠石，其富集程度居世界首位。本文基于岩芯、薄片、背散射图像观察及流体包裹体和硼同位素测试分析，试图探讨风城组富集硅硼钠石的原因。矿物学研究发现，硅硼钠石是成岩作用产物，以交代碳酸盐矿物为主，包括碳钠钙石、碳钠镁石、氯碳钠镁石、方解石、天然碱，甚至是极少见的钡方解石。风城组硅硼钠石中原生盐水包裹体均一温度为100 ℃~116 ℃，硅硼钠石的δ11B在0.33‰~2.13‰之间，结合前人硅硼钠石合成实验成果，认为硅硼钠石的B来源于原始沉积环境中的深部热液流体，受地表及浅埋藏过程中温度压力的限制，硅硼钠石主要形成于深部成岩环境中（>3 000 m）。玛湖凹陷风城组之所以较世界上其他新生代碱湖沉积物更发育硅硼钠石，一方面在于沉积过程中其岩浆热液活动更为强烈，另一方面在于成岩作用时间更为漫长，使硅硼钠石交代作用更为充分。
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| 关 键 词： | 硅硼钠石 成岩作用 风城组 碱湖 玛湖凹陷 准噶尔盆地 |
| 收稿时间： | 2019-07-04 |
Genesis of Reedmergnerite in the Lower Permian Fengcheng Formation of the Junggar Basin,NE China |
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| Institution: | 1.Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology), Chengdu 610059, China3.School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610059, China4.Institute of Henan Land and Resources Sciences, Zhengzhou 450000, China |
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| Abstract: | The Lower Permian Fengcheng Formation in the Mahu Sag of the Junggar Basin was developed in a volcanic?induced alkaline saline lacustrine environment， with deposition of thick?bedded sodium carbonates and high?quality source rocks， as well as the borosilicate reedmergnerite， which is a rare mineral globally but is very rich in the Fengcheng Formation. Based on petrography， fluid inclusion and boron isotope studies， the aim of this study was to discover the origin of the reedmergnerite which， in the Fengcheng Formation， often replaces carbonate minerals， including shortite， eitelite， northupite， calcite， trona， and even barytocalcite. The homogenization temperature of the primary inclusions in the reedmergnerite ranged from 100 to 116°C. Previous synthetic experimental studies have found that the δ11B values of reedmergnerite are 0.33?2.13‰. It is proposed here that， due to the limitations of temperature and pressure in surface or shallow burial processes， the source of boron in reedmergnerite was deep hydrothermal fluid in the original sedimentary environment， mainly in deep diagenetic environments （>3000 m）. Therefore， the enrichment of reedmergnerite in the Fengcheng Formation is interpreted as the result of intense magmatic hydrothermal activity and a long diagenetic history. |
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