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首页> 外文期刊>Protein and peptide letters >Discovery and identification of clay-sized tuffaceous rocks in Chang 7 Member of Upper Triassic Yanchang Formation in Ordos Basin, China
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Discovery and identification of clay-sized tuffaceous rocks in Chang 7 Member of Upper Triassic Yanchang Formation in Ordos Basin, China

机译：中国鄂尔多斯盆地鄂尔多斯盐昌昌昌昌昌昌第7成员粘土大小岩石的发现与鉴定

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This study for the first time demonstrates that some of the so-called clay-sized mudstones observed by the naked eye, such as clay-sized black mudstones and clay-sized oil shales, which are rich in black organic matter (including oil and asphaltene), in the Chang 73 Submember of the Upper Triassic Yanchang Formation in the Ordos Basin of China are actually clay-sized tuffaceous rocks (including tuff, sedimentary tuff and tuffaceous sedimentary rock) with high hydrocarbon generation capacities. Thus, these rocks can be defined as clay-sized tuffaceous source rocks. Identification of this lithology has important theoretical and practical significance for the exploration and development of shale oil in the Chang 7 Member. Through the macroscopic observation of drill cores and outcrop profiles, microscopic observation of electron probe thin sections and whole-rock inorganic geochemical analysis (including major, trace and rare earth elements), this work demonstrates that the organic matter-rich clay-sized tuffaceous rocks, especially clay-sized tuffs, have the following characteristics. First, the clay-sized tuffaceous rocks with little black organic matter are mainly greyish white, yellowish brown and purplish grey, and mixed colors occur in areas with strong bentonite lithification. Second, the clay-sized tuffaceous rocks have experienced strong devitrification and recrystallization, forming abundant flaky aluminosilicate minerals with directional arrangement. In thin sections under a polarizing microscope, the interference colors generally show regular alternation between the lowest interference color of first-order yellow and the highest interference color of second-order blue-green. Third, the rock samples plot in the igneous rock field in the TiO2-SiO(2)cross-plot and exhibit similar trace element and rare earth element patterns on spider diagrams, indicating that the samples are derived from the same source. The results prove that clay-sized tuffaceous rocks may be widespread in the Chang 73 Submember of the Upper Triassic Yanchang Formation in the Ordos Basin, China.
机译：本研究首次表明，肉眼观察的一些所谓的粘土泥岩，如粘土尺寸的黑泥岩和粘土大小的石油，富含黑色有机物（包括油和沥青质） ），在鄂尔多斯盆地的康复延东地区的Chang 73提交人中，其实际上是粘土大小的臭岩石（包括凝灰岩，沉积凝灰岩沉积岩），具有高碳氢化合物产生的能力。因此，这些岩石可以被定义为粘土型凝灰岩源岩。鉴定这种岩性的鉴定对于昌7成员的岩石油勘探和发展具有重要的理论和实践意义。通过宏观观察钻孔和露头曲线，电子探针微观观察薄截面和全岩无机地球化学分析（包括主要，痕量和稀土元素），这项工作表明，富含有机物质的粘土型臭岩石，尤其是粘土大小的凝灰岩，具有以下特征。首先，具有小黑色有机物的粘土大小的牙臭岩主要是灰白色，淡黄色棕色和紫色灰色，而混合颜色发生在具有较强的膨润土溶质的区域。其次，粘土大小的凝灰岩岩体经历了强烈的透透化和重结晶，形成了具有方向布置的丰富的片状硅铝酸盐矿物质。在偏振显微镜下的薄部分中，干涉颜色通常在一阶黄色的最低干涉颜色和二阶蓝绿色的最高干扰颜色之间显示常规交替。第三，岩石样品在TiO2-SiO（2）交叉曲线中的发火岩场中的图表和在蜘蛛图上表现出类似的微量元素和稀土元素图案，表明样品源自相同的源。结果证明，粘土大小的牙垢岩石可能普遍存在中国鄂尔多斯盆地上三叠纪盐昌地区的Chang 73提交中。

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