| 白平,肖加飞,何熙琦,石磊,李艳桃.黔北西部遵义—大方一带早寒武世层序地层及沉积环境[J].贵州地质,2014,31(4):291-296272 |
| 黔北西部遵义—大方一带早寒武世层序地层及沉积环境 |
| Sequence Stratigraphy and Sedimentary Environment of Early Cambrian in Zunyi-Dafang Area of Northwest Guizhou |
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| DOI： |
| 中文关键词: 层序地层 地层格架 沉积环境 早寒武世 黔北西部 |
| 英文关键词:Sequence stratum Stratum framework Sedimentary environment Early Cambrian Northwest Guizhou |
| 基金项目:中国地调局地质调查项目(基[2002]011-05)和矿床地球化学国家重点实验室项目群项目(ZKLODG-ZY125-08)。 |
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| 中文摘要: |
| 黔北西部遵义-大方一带早寒武世沉积地层发育完整,中下部以陆源碎屑岩为主,上部则主要为碳酸盐岩。金沙岩孔剖面露头良好,标志清楚,具有多个相对深-浅变化旋回,共划分为5个沉积层序,第一、第二、第四层序及第三层序的高水位体系域为陆源碎屑沉积,第三层序的海侵体系域和第五层序由碳酸盐沉积构成。层序地层格架显示沉积厚度具有西厚东薄的变化特点,各层序的体系域厚度总体上表现为海侵体系域小于高水位体系域。早寒武世沉积环境具有由深变浅的演化特点,总的沉积环境变迁为深水滞流陆棚→广海陆棚→碳酸盐岩缓坡→广海陆棚→浅水滨岸→碳酸盐岩台地。 |
| 英文摘要: |
| In Zunyi-Dafang of northwest Guizhou, the sedimentary stratum of early Cambrian developed completely, the rock in the middle and lower part mainly is land calstic rock, the up area mainly is carbonate rock. The section outcrop of Jinsha pore is fine, the signal is clear and has many deep-shallow variation cycles, then it was divided into 5 sedimentary sequences, the high water-level system trackof 1st, 2nd, 4th and 3rd sequence is land clastic sediment, the transgressive system track of the 3rd sequence and the 5th are made up of carbonate sediment. The sequence stratum framework shows the sedimentary thickness is thick in the east and thin in the west, the system track thickness of each sequence shows the transgressive system track is thinner than high water-level system track. The sedimentary environment evolution of early Cambrian changes from deep to shallow, the transition sequence of general sedimentary is:deep retention shelf—open sea shelf—carbonate ramp—open sea shelf—shallow onshore—carbonate platform. |
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