| 徐安全,肖加飞,王雪华,肖腾.贵州镇宁地区早—中三叠世地层特征及沉积环境变迁[J].贵州地质,2015,32(2):98-104,110 |
| 贵州镇宁地区早—中三叠世地层特征及沉积环境变迁 |
| The Under Strata Features and Sedimentary Environment Transition of Early-middle Triassic in Zhenning, Guizhou |
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| DOI： |
| 中文关键词: 地层 沉积相 沉积环境 早—中三叠世 镇宁 |
| 英文关键词:Strata Sedimentary facies Sedimentary environment Early-middle Triassic Zhenning |
| 基金项目:贵州省区域地质调查项目[黔地发（1995）16号]和矿床地球化学国家重点实验室项目群项目（SKLODG-ZY125-08） |
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| 中文摘要: |
| 镇宁地区早—中三叠世地层发育良好，相变明显，是贵州三叠纪“S”型相变带的组成部分之一。地层序列中各组（段）的岩石组合与沉积相为：大冶组主要由薄层灰岩夹少量砾屑灰岩组成，主体为缓斜坡相沉积；安顺组主要为一套白云岩，为局限台地—台地边缘滩（丘）相沉积；罗楼组与青岩组主要为一套薄层灰岩夹厚层砾屑灰岩，为斜坡相沉积；关岭组、花溪组及杨柳井组主要由白云岩与灰岩组成，为一套局限台地相沉积；垄头组主要由厚块状灰岩、角砾灰岩及少量白云岩组成，下部主要为台地边缘滩相沉积，上部为斜坡垮塌堆积与台缘滩相沉积的交互；边阳组主要为一套砂泥岩组合，代表了盆地相浊流沉积。早—中三叠世各时期的环境变迁颇具特色。印度期总体为缓斜坡环境；奥伦期古地形发生分异，出现了台地—斜坡的新沉积格局，且斜坡坡度变大；安尼期古地形分异更加明显，台缘向前迁移，但沉积格局未发生大的变化，唯斜坡坡度进一步增大；拉丁期台缘向后迁移，出现了较完整的台—坡—盆新格局。 |
| 英文摘要: |
| ]In the Zhenning area, the strata of early-middle Triassic develops well, the phase transition is abvious, it’s part of S phase transition belt of Triassic period in Guizhou. The rock association and sedimentary phase of each section in the strata sequence are: Daye formation consist of thin bed limestone and some rubble limestone, the body is gentle slope phase sediment. Anshun formation is dolomite and restricted platform-platform margin phase sediment. Anshun formation consist of thin bed limestone and thick rubble limestone, it’s a slope phase sediment. Guanling formation, Huaxi formation and Yangniu formation consist of dolomite and limestone, it’s a restricted platform phase sediment. Longtou formation consist of thick limestone, rubble limestone and some dolomite, the low part is platform margin phase sediment, the up part is the interaction of slope collapse accumulation and platform margin phase sediment. Bianyang formation is a sand shale association and represents basin facies turbidite deposit. The environment transition of different periods in early-middle Triassic is special. Induan Age is gentle slope environment, the ancient landform changed in Aolun Age and became a new sedimentary pattern of platform-slope. The change of ancient landform in Anisian Age is more obvious, the platform margin transit forward, but the sedimentary pattern changed a little and the slope is bigger. The platform margin in .Ladinian Age transit backward, the complete new pattern of platform-slope-basin appeared. |
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