| 上扬子地区中生代沉积盆地演化 |
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| 引用本文： | 韦一,张宗言,何卫红,吴年文,杨兵. 上扬子地区中生代沉积盆地演化[J]. 地球科学, 2014, 39(8): 1065-1078. DOI: 10.3799/dqkx.2014.095 |
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| 作者姓名： | 韦一 张宗言 何卫红 吴年文 杨兵 |
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| 作者单位： | 1.中国地质大学生物地质与环境地质国家重点实验室, 湖北武汉 430074 |
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| 基金项目： | 中国地质调查局项目(Nos.1212010733802,12120113012500) |
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| 摘 要： | 以地层分区为单位对上扬子地区中生代沉积建造进行了详细分析, 对盆地原型进行了初步划分, 建立了中生代上扬子陆块沉积盆地时空分布格架.结合年代地层和生物地层划分对比、生物古地理、岩相古地理和构造演化规律的综合分析, 对上扬子地区中生代3个阶段的盆地演化过程进行生动刻画, 并以此为依据分析了盆地形成演化的大地构造环境.早三叠世上扬子陆块受印支造山运动的影响不断抬升, 海相盆地水体变浅, 形成一系列混积陆表海、台盆-台地构造相; 晚三叠世-早侏罗世上扬子西缘与其西侧的特提斯域地块或多岛弧盆增生体发生碰撞拼合, 且华南陆块与华北陆块的碰撞拼合, 使上扬子陆块西南缘、西缘和北缘发育了前陆盆地和周缘前陆盆地, 与此同时雪峰隆起进入造山过程; 中侏罗世之后, 由于受古太平洋板块向西对亚洲大陆的俯冲, 上扬子陆块进入了以陆内造山作用为主的新的构造阶段, 以雪峰山为界, 东部发育一系列断陷-坳陷盆地, 西侧则发育陆内大型压陷盆地.
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| 关 键 词： | 上扬子 中生代 沉积 盆地演化 构造 |
| 收稿时间： | 2014-03-16 |
Evolution of Sedimentary Basins in the Upper Yangtze during Mesozoic |
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| Abstract: | The geotectonic environments are reconstructed and presented in this paper. Firstly, the Mesozoic sedimentary formation of the Upper Yangtze is studied in detail, then the basin features are analyzed based on the lithology of each unit (formation) and the space distribution framework of basins is established. Eventually, three stages of tectonic evolution of the Upper Yangtze are summarized by means of detailed analysis of chronostratigraphic and biostratigraphic correlations, paleogeography of biology, lithofacies and tectonics. The Upper Yangtze region rose continuously, water of which became shallow, and a series of clastic-carbonate epeiric sea and platform-interplatform basin sedimentary basin formed because of Indosinian orogeny during Early-Middle Triassic. When it came to Late Triassic to Early Jurassic, the Upper Yangtze collided with the Tethys domain block or arc-basin collisional zone in its west, the paleogeographic environments in the southwest and north of which turned to foreland basin and peripheral foreland basin, while the Xuefeng uplift turned orogeny. After middle Jurassic, with the subduction of paleo-Pacific plate to Asia plate, the south Upper Yangtze came into continental orogenic stage that mainly developed a series of downwarped basins to the east of Xuefeng Mountain and a large-scale depressional basin to the west. |
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