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摘要: 物源分析是我们研究沉积体系和岩相古地理格局的前提和基础，在一定程度也是描述微相和砂体展布的总体格局，以及对砂体进行预测和评价的依据。晚三叠世延长期鄂尔多斯盆地周缘存在多个古陆，包括北部的阴山古陆、西北缘的阿拉善古陆、南部的祁连—秦岭古陆及西南的陇西古陆等，它们都是盆地碎屑沉积物的主要供给源。长6沉积期，姬塬地区处于鄂尔多斯盆地偏西部地区，进行物源分析尤其是指出主要物源方向对沉积相及砂体展布规律研究都有重要意义。通过碎屑组分分析、重矿物分析、岩屑组分分析、阴极发光分析、稀土元素分析，以及古盐度恢复等研究方法，发现研究区存在北东方向主要物源区和北西方向次要物源区，同时也存在西南方向的物源供给。Abstract: Provenance analysis is the basis and promise of depositional system and palaeogeography. To some extend provenance analysis is the reference for microfacies and sandbody distribution, sandbody forecast and evaluation. There were several ancient lands around Ordos Basin during Late Triassic, including Yinshan Old Land of the north, Alxa Old Land to the northewest, QilianQinlin Old Land of the south and Longxi Old Land of the southwest and so on. These Old Lands were the main source of the detrital sediment in the Basin. Jiyuan region locate in west of Ordos Basin in Chang6 depositional stage, Provenance analysis especially pointing out the main source orientation is significant for sedimentary facies and sandbody distribution. By the analysis of debris components, heavy minerals assemblage, lithic fragment components, cathodoluminescence image, REE, and paleosalinity recovery, it indicated that northeast were main source orientation and northwest is the subordinate source orientation of the studied area, and southwest supply sediment at the same time.
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