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西秦岭临潭地区泥盆纪—三叠纪沉积环境恢复与盆地构造演化

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冯欣, 邵兴坤, 侯红星, 秦丹鹤. 西秦岭临潭地区泥盆纪—三叠纪沉积环境恢复与盆地构造演化[J]. 地质与资源, 2023, 32(5): 517-527. doi: 10.13686/j.cnki.dzyzy.2023.05.001
引用本文: 冯欣, 邵兴坤, 侯红星, 秦丹鹤. 西秦岭临潭地区泥盆纪—三叠纪沉积环境恢复与盆地构造演化[J]. 地质与资源, 2023, 32(5): 517-527. doi: 10.13686/j.cnki.dzyzy.2023.05.001
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FENG Xin, SHAO Xing-kun, HOU Hong-xing, QIN Dan-he. RESTORATION OF DEVONIAN-TRIASSIC SEDIMENTARY ENVIRONMENT AND BASIN TECTONIC EVOLUTION IN LINTAN AREA, WEST QINLING[J]. Geology and Resources, 2023, 32(5): 517-527. doi: 10.13686/j.cnki.dzyzy.2023.05.001
Citation: FENG Xin, SHAO Xing-kun, HOU Hong-xing, QIN Dan-he. RESTORATION OF DEVONIAN-TRIASSIC SEDIMENTARY ENVIRONMENT AND BASIN TECTONIC EVOLUTION IN LINTAN AREA, WEST QINLING[J]. Geology and Resources, 2023, 32(5): 517-527. doi: 10.13686/j.cnki.dzyzy.2023.05.001
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西秦岭临潭地区泥盆纪—三叠纪沉积环境恢复与盆地构造演化

  • 中国地质调查局 廊坊自然资源综合调查中心, 河北 廊坊 065000

  • 基金项目:
    中国地质调查局项目"西北沿边及特殊地区地质矿产调查"(编号DD20160079)
详细信息
    作者简介: 冯欣(1985-), 男, 硕士, 工程师, 从事区域地质调查工作, 通信地址 河北省廊坊市广阳区广阳道93号, E-mail//fengxin01305105@163.com
    通讯作者: 邵兴坤(1985-), 男, 硕士, 工程师, 从事区域地质调查工作, 通信地址 河北省廊坊市广阳区广阳道93号, E-mail//740703590@qq.com

  • 中图分类号: P534.4;P542

RESTORATION OF DEVONIAN-TRIASSIC SEDIMENTARY ENVIRONMENT AND BASIN TECTONIC EVOLUTION IN LINTAN AREA, WEST QINLING

  • Langfang Natural Resources Comprehensive Survey Center, CGS, Langfang 065000, Hebei Province, China

More Information

    摘要

  • 根据西秦岭临潭地区泥盆纪-三叠纪沉积盆内细碎屑岩的主量、微量、稀土元素特征追溯源区背景, 反演母岩性质, 建立了该区沉积盆地与构造演化模式.认为沉积盆地的物源总体来自盆地的北部, 北部经历了晚泥盆世的陆相-湖相沉积, 石炭纪的滨岸海滩相-温暖潮湿的近岸海湾(潟湖或潮坪)相-浅海陆棚相沉积, 到二叠纪的浅海陆棚-浅海陆棚内的堡礁或堤礁建造; 沉积盆地南部为稳定的碳酸盐台地相.三叠纪, 盆地经历了大陆斜坡浊流沉积-大陆斜坡(半深海)浊流沉积-滨浅海沉积环境复杂的环境变化.沉积盆地形成演化整体划分为3个阶段: 被动大陆边缘台盆台地稳定发育阶段; 弧后盆地形成演化阶段; 弧后前陆盆地叠合阶段.

    Based on the characteristics of major, trace and rare earth elements of the fine clastic rocks in the Devonian-Triassic sedimentary basin in Lintan area, West Qinling Mountains, the sedimentary environment and tectonic evolution model are established through tracing the background of source region and inversion of the parent rock properties. It is believed that the provenance of the sedimentary basin generally comes from the northern part which underwent continental-lacustrine deposition in the Late Devonian, the shore beach facies-warm and humid coastal bay(lagoon or tidal flat) facies-shallow marine shelf facies deposition in the Carboniferous, and the shallow marine shelf-barrier reef formation within shallow marine shelf in the Permian; while the southern sedimentary basin is a stable carbonate platform facies. In the Triassic, the basin experienced complex sedimentary environmental changes, that is, turbidity deposition on continental slope-turbidity deposition on continental slope (semi-deep sea)-littoral neritic sea. The formation and evolution of sedimentary basin can be divided into three stages, including the stable development of passive continental margin intraplatformal basin and platform, formation and evolution of back-arc basin, and superposition of back-arc foreland basin.

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  • 图 1  研究区构造位置及地层分区图(据文献[7]修改)

    Figure 1. 

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    图 2  大草滩组岩石组合及沉积构造特征

    Figure 2. 

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    图 3  中细粒长石石英砂岩镜下特征

    Figure 3. 

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    图 4  巴都组上段地层野外特征

    Figure 4. 

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    图 5  十里墩组野外特征

    Figure 5. 

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    图 6  西秦岭造山带泥盆纪—三叠纪砂岩沉积环境判别图(据文献[15])

    Figure 6. 

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    图 7  西秦岭造山带泥盆纪—三叠纪砂岩构造环境判别图(据文献[15]修改)

    Figure 7. 

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    图 8  西秦岭造山带泥盆纪—三叠纪砂岩La-Th-Sc-Zr构造环境判别图(据文献[15]修改)

    Figure 8. 

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    图 9  西秦岭造山带泥盆纪—三叠纪砂岩源区判别图(据文献[15])

    Figure 9. 

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    图 10  西秦岭临潭地区泥盆纪—三叠纪沉积盆地演化示意图(据文献[21]修改)

    Figure 10. 

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    表 1  西秦岭临潭地区古生代—中生代岩石地层单位划分表

    Table 1.  Paleozoic-Mesozoic lithostratigraphy in Lintan area, West Qinling

    地质年代 岩石地层单位
    代 纪 世 代号 中秦岭地层小区 南秦岭地层小区
    中生代 三叠纪 晚三叠世 T3 大河坝组（T3d）
    中三叠世 T2 光盖山组（T2gg）
    早三叠世 T1 隆务河组（T1l）
    古生代 二叠纪 早中二叠世 P1-2 十里墩组（P1-2sl）
    石炭纪 晚石炭世 C2 下加岭组（C2x）
    早石炭世 C1 巴都组（C1b）
    泥盆纪 晚泥盆世 D3 大草滩组（D3dc）
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收稿日期:  2022-04-12
修回日期:  2022-07-29
刊出日期:  2023-10-25

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