辽西义县盆地英窝山下白垩统义县组砖城子层沉积岩石组合特征及古环境研究
- 收稿日期:
1900-01-01
- 修回日期:
1900-01-01
- 刊出日期:
2011-02-10
摘要: 辽西义县盆地是中生代阜新—义县断陷盆地中大凌河以南的次级凹陷区，盆地内近东西走向的马神庙—刀把地—三百垄—金刚山一带为义县组标准地层剖面出露地。作为义县阶标准地层剖面的义县盆地英窝山砖城子层为一套早白垩世义县组的湖相沉积组合。野外详细沉积岩和地层学研究将砖城子层进一步划分出三个沉积亚单元。英窝山砖城子层下部为一套膨润土化凝灰质粗砂岩、杂色泥砾岩、灰绿色凝灰质砾岩、焦土黄色细砾岩组成的粗粒浊积岩段（T，Ta1，Ta2）与灰绿色膨润土化凝灰质粉砂岩、含炭屑沉凝灰岩、泥岩组成的细粒浊积岩段（Tb1，Tb2）沉积岩组合。在浊流沉积与区域性构造运动综合影响下，湖盆水体变深，从而遭受至少4期的浊流沉积作用，形成粗—细浊积岩段（Ta3—Ta6，Tb3—Tb6），并在细粒的浊积岩段（Tb）之上形成薄层白云岩沉积层。砖城子层中部为硅化白云岩、含燧石团块白云质灰岩、纹层状白云岩、白云质胶结滑塌沉积灰岩组成的古湖泊相碳酸盐岩组合。砖城子层上部为凝灰质砂屑灰岩、含膨润土泥灰岩、白云岩、膨润土岩、膨润土化凝灰质粉砂岩、深灰黑色页岩组合，岩石呈现半深湖—深湖相至半深湖—浅湖相的岩石组合特征。砖城子层的沉积岩石组合特征揭示了早白垩世该区古湖泊边缘发育浊流沉积、湖坪化作用、湖泊边缘斜坡—半深湖相形成白云质灰岩、深湖相沉积纹层状白云岩—页（泥）岩、凝灰质碎屑以及大量陆源碎屑充填湖泊的地质演化过程。
The Sedimentary Petrographic Association and Palaeoenvironment of Zhuanchengzi Layer of Lower Cretaceous Yixian Formation in Yingwoshan Area, Yixian Basin
- Geology Department of Northeastern University, Shenyang110004
- Received Date:
1900-01-01
- Rev Recd Date:
1900-01-01
- Publish Date:
2011-02-10
Abstract: In western Liaoning province, the Yixian Basin is thought as the subdepression of Cretaceous FuxinYixian Basin, the intrabasin Yixian Formation section is cropped out in MashenmiaoDaobadiSanbailongJingangshan, strikingly from east to west. As the middle part of Yixian Formation, Zhuanchengzi layer consists of lacustrine sediments in Yingwoshan area. These sedimentary piles are divided into three subdivisions. The lower part comprises coarser turbidites(T, Ta1, Ta2)and finer turbidites(Tb1, Tb2), the former is made up of bentonitic gritstone, mottle gompholite, grayishgreen tuffaceous conglomerate, earthy granular conglomerate, the latter is grayishgreen bentonitic siltsone, containing carbonized debris, sedimentary tuffite and mudstone. Influenced by turbidity and regional tectonic processes, the water column becomes shallower, the coarser and finer turbidites divisions (Ta3Ta6, Tb3Tb6)were formed around lake margin and thinbedded silicified dolomite deposits on the finer turbidite divisions. The middle part of Zhuangchengzi layer consists of silicified dolomite, containing chert nodules, dolomitic limestone, laminae dolomite and slumping dolomitic limestone. The upper part of Zhuangchengzi layer is characterized by hemi to deep and hemi to shallow lacustrine facies, the rock assemblage is of tuffaceous calcarenite, bentonitic marl, dolomite, bentonite and greyblack shale. The sedimentary rock association indicates that there were marginal turbidity processes, lacustrineplat environment, dolomitic limestone formed around lacustrine ramp, laminae dolomiteshale formed in deep lacustine facies, and a lot of volcanic and terrestrial clastic debris filled the basin.
梁俊红. 辽西义县盆地英窝山下白垩统义县组砖城子层沉积岩石组合特征及古环境研究[J]. 沉积学报, 2011, 29(1): 14-22.
| 引用本文: |
梁俊红. 辽西义县盆地英窝山下白垩统义县组砖城子层沉积岩石组合特征及古环境研究[J]. 沉积学报, 2011, 29(1): 14-22.
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LIANG Junhong. The Sedimentary Petrographic Association and Palaeoenvironment of Zhuanchengzi Layer of Lower Cretaceous Yixian Formation in Yingwoshan Area, Yixian Basin[J]. Acta Sedimentologica Sinica, 2011, 29(1): 14-22.
| Citation: |
LIANG Junhong. The Sedimentary Petrographic Association and Palaeoenvironment of Zhuanchengzi Layer of Lower Cretaceous Yixian Formation in Yingwoshan Area, Yixian Basin[J]. Acta Sedimentologica Sinica, 2011, 29(1): 14-22.
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