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首页> 外文期刊>Journal of Palaeogeography >Nonmarine time-stratigraphy in a rift setting: An example from the Mid-Permian lower Quanzijie low-order cycle Bogda Mountains, {NW} China
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Nonmarine time-stratigraphy in a rift setting: An example from the Mid-Permian lower Quanzijie low-order cycle Bogda Mountains, {NW} China

机译：裂谷环境下的非海洋时间地层学：以二叠纪中下游全子街低阶旋回博格达山为例，中国{NW}

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Abstract Sedimentological and stratigraphic studies of seven stratigraphic sections of Permian Hongyanchi (HYC) and Quanzijie (QZJ) low-order cycles (LCs) in the Tarlong-Taodonggou half graben and Dalongkou area in Bogda Mountains, {NW} China, demonstrate effective approaches and methodology in cyclo- and time-stratigraphic analyses of complex fluvial-lacustrine deposits in an intracontinental rift setting. A new synchronous stratigraphic unit, the lower {QZJ} {LC} is defined. The lower and upper boundaries of this cycle include a regionally correlative disconformity, erosional unconformity, and conformity, across which significant and abrupt changes in palaeoenvironments and tectonic and climatic conditions occurred. The lower boundary is an erosional unconformity and disconformity with a high-relief topography that juxtaposes lacustrine deposits of the underlying {HYC} {LC} with the overlying meandering stream deposits of the lower {QZJ} LC, and was caused by a regional tectonic uplift. The upper boundary is a disconformity and local erosional unconformity and conformity, juxtaposing stacked paleosols developed on fluvial sediments with overlying fluvial and loessial deposits of the upper {QZJ} LC. The paleosols indicate landscape stability and a prolonged period of subaerial exposure and minimal deposition and suggest that climatic conditions were semi-arid with strong precipitation seasonality in the Tarlong-Taodonggou half graben and subhumid in the Dalongkou area. The fluvial-loessial deposits indicate a renewed tectonic uplift and a change in the atmospheric circulation pattern. The newly-defined lower {QZJ} {LC} facilitates accurate palaeogeographic reconstruction in the study area during a period of major tectonic and climatic changes. The interpreted tectonic and climatic conditions provide a critical data point in the mid-latitude east coast of {NE} Pangea during the Mid-Permian icehouse-hothouse transition. The results demonstrate that a process-response approach is effective in time-stratigraphic analysis of complex fluvial-lacustrine strata in a highly-partitioned rift basin.
机译：摘要{NW}中国博格达山塔隆-陶洞沟半grab陷和大龙口地区二叠系红岩池和高子界低阶旋回七个地层的沉积学和地层研究，证明了有效的方法和方法。陆内裂谷环境下复杂河流-湖相沉积物的环地层和时间地层分析的方法学。定义了新的同步地层单位，较低的{QZJ} {LC}。该周期的上下边界包括区域相关的不整合面，侵蚀不整合面和整合面，在此期间，古环境，构造和气候条件发生了明显而突然的变化。下边界是侵蚀不整合面和不整合面，其高起伏地形使下层{HYC} {LC}的湖相沉积与下{QZJ} LC的上覆蜿蜒流沉积并置，并且是由区域构造隆升引起的。上边界是不整合面和局部侵蚀不整合面和整合面，将堆积在河流沉积物上的堆积古土壤与{QZJ} LC上部的河流和黄土沉积物并置。古土壤表明了景观的稳定性，延长了暴露于地下的时间，沉积物最少，并且表明气候条件为半干旱，塔隆-桃洞沟半干旱地区有强降水季节，大龙口地区为半湿润。河流-黄土沉积表明新的构造隆升和大气环流模式的变化。新定义的下部{QZJ} {LC}有助于在主要的构造和气候变化时期对研究区域进行准确的古地理重建。在中二叠纪冰室-温室过渡期间，解释的构造和气候条件为{NE} Pangea中纬度东海岸提供了关键的数据点。结果表明，在高度分割的裂谷盆地中，复杂的河流湖相地层的时间地层分析中，过程响应方法是有效的。

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