| 柴达木盆地西部地区渐新世沉积物源分析 |
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| 引用本文： | 王艳清,宫清顺,夏志远,熊绍云.柴达木盆地西部地区渐新世沉积物源分析[J].中国地质,2012,39(2):426-435. |
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| 作者姓名： | 王艳清 宫清顺 夏志远 熊绍云 |
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| 作者单位： | 中国石油杭州地质研究院,浙江杭州,310023 |
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| 基金项目： | 中国石油天然气股份有限公司重大科技专项“柴达木盆地油气勘探开发关键技术研究”子课题“柴西地区富油气凹陷圈闭精细评价及钻探目标选择”(07-01Z-01-02)资助 |
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| 摘 要： | 沉积物源分析在确定沉积物源位置、母岩性质及沉积物搬运距离,甚至整个盆地的沉积作用和构造演化等方面都有重要意义。本文从重矿物组合、轻矿物组合、稀土元素分配和古水流恢复等方面系统地分析了柴达木盆地西部地区渐新世物源方向,确定了阿尔金东段物源、阿尔金西段物源、阿拉尔物源、铁木里克物源、祁漫塔格—东柴山物源和弯西—甘森物源6大沉积物源。沉积物源特征明显控制了沉积物特征,来自阿尔金西段物源的沉积物搬运距离短,碎屑物供给明显受季节性洪水控制,故稳定性差,发育近源陡坡型的扇三角洲、近岸水下扇沉积物;来自其余物源的沉积物搬运距离较长,最长搬运距离约190 km,碎屑物供给的稳定性较好,发育远源缓坡型的辫状三角洲沉积物,受不同沉积物源的影响,其沉积特征具有明显的差异性。
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| 关 键 词： | 柴达木盆地 重矿物 轻矿物 古水流 沉积物源 |
Provenance analysis of Oligocene sediments in western Qaidam Basin |
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| WANG Yan-qing,GONG Qing-shun,XIA Zhi-yuan,XIONG Shao-yun.Provenance analysis of Oligocene sediments in western Qaidam Basin[J].Chinese Geology,2012,39(2):426-435. |
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| Authors: | WANG Yan-qing GONG Qing-shun XIA Zhi-yuan XIONG Shao-yun |
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| Institution: | (PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,Zhejiang,China) |
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| Abstract: | Provenance analysis is of great significance in determining the sediment source,parent rock properties,sediment transport distance,and even sedimentation and tectonic evolution of the whole basin.Heavy mineral assemblages,light mineral assemblages,REE distribution pattern and palaeocurrent direction were systemically analyzed in this paper.Six main provenances in the Oligocene period of western Qaidam Basin were determined,i.e.,eastern Altun provenance,western Altun provenance,Aral provenance,Tomorlog provenance,Qimantag-Dongqaishan provenance,and Wanxi-Gansen provenance.Provenance characteristics significantly control sediment characteristics.The sediment transport distance from western Altun provenance was short.Pyroclasts supply was evidently controlled by seasonal floods,so it was very unstable and always developed near-source steep type fan delta and near-shore subaqueous fan sediments.Sediments from the rest of the provenance were transported for a long distance,with the maximum transport distance being about 190 Km;pyroclasts supply was stable,and thus developed braided delta sediments of far-source mild slope type.Due to the influences of several provenances,the sedimentary characteristics were obviously different. |
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| Keywords: | Qaidam Basin heavy minerals light minerals palaeocurrent directions provenance |
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