| 新疆柯坪地区志留系—泥盆系砂岩粒度分布特征及沉积环境 |
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| 作者姓名： | 阎琨 马伟 柳晓丹 李娜 |
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| 作者单位： | 中国人民武装警察部队黄金第七支队,烟台 264000 |
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| 基金项目： | 中国地质调查局“西北沿边及特殊地区地质矿产调查(编号: DD20160079)”和“西南天山柯坪地区六幅地质矿产综合调查(编号: 1212011504201)”项目联合资助 |
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| 摘 要： | 为了系统研究柯坪地区志留系—泥盆系沉积环境演化特征,采用沉积学、地层学的方法,重点以粒度分析为研究手段,对砂岩进行详细分析。通过研究识别出河控三角洲、扇三角洲、潮坪和滨岸4种沉积环境,每种环境都具有独特的粒度特征及概率累积曲线: 河控三角洲主要为典型两段式、一跳一悬夹过渡式、低斜多段式; 扇三角洲主要为上拱弧形式; 潮坪主要为典型三段式和多段式; 滨岸环境主要为高斜两段式、高斜多段式。从志留纪—泥盆纪,沉积环境由湿润的河控三角洲逐步转变为干燥的滨岸沉积,砂岩的成熟度也逐渐增加,表明柯坪地区逐渐远离物源区,逐步处于构造稳定的背景。
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| 关 键 词： | 柯坪地区 碎屑岩 粒度分析 沉积环境 |
| 收稿时间： | 2019-06-25 |
Grain-size distribution characteristics and sedimentary environment of Silurian- -Devonian sandstone in Keping area of Xinjiang Province |
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| Authors: | YAN Kun MA Wei LIU Xiaodan LI Na |
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| Institution: | The 7th Gold Detachment of People’s Armed Police, Yantai 264000, China |
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| Abstract: | In order to systematically study the evolution characteristics of Silurian- -Devonian sedimentary environment in Keping area, the authors analyzed the sandstone in detail through sedimentary, stratigraphic and grain size analysis. Four sedimentary environments, including river-controlled delta, tidal-controlled delta, tidal flat and coast, were identified, with their own unique grain-size characteristics and probability cumulative curves. River-controlled delta is featured with typical two stages, hop-suspension transition and low-skew multistage. Fan delta is featured with the upper arch arc. Tidal-controlled delta is featured with typical three stages and multistage. Coastal area is feotured with high oblique two stages and high oblique multistage. The sedimentary environment gradually changed from wet river-controlled delta to dry coastal deposit from Silurian to Devonian, with the increasing maturity of sandstone. This indicates that Keping area was gradually away from provenance area and in the background of structural stability. |
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| Keywords: | Keping area clastic rocks grain-size analysis sedimentary environment |
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