马会珍,谭靖.贵州盘县新民地区中三叠世关岭组盘县生物群埋藏环境分析[J].贵州地质,2018,35(2):138-144
贵州盘县新民地区中三叠世关岭组盘县生物群埋藏环境分析
Analysis on Buried Environment of Panxian Biota in Guanlin Formation of Middle Triassic in Xinmin Area of Panxian,Guizhou
  
DOI:
中文关键词:  盘县生物群  关岭组二段  埋藏环境  贵州
英文关键词:Panxian biota  2th section of Guanling formation  Buried environment  Guizhou
基金项目:本文为贵州地矿局青年地质科研项目《盘县生物群埋藏环境及生态环境探讨》[黔地矿科合(2014)15号]成果,受贵州省地质调查院地质物探开发应用工程技术研究中心和院士工作站资助。
作者单位
马会珍 贵州省地质调查院贵州贵阳550005 
谭靖 贵州省地质勘查矿产开发局中心实验室贵州贵阳550055 
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中文摘要:
      运用沉积学、古生物学及地球化学原理对赋存盘县生物群的贵州省盘县新民地区楚皮凹剖面中三叠统关岭组第二段的生物组合、岩性组合和以及火山活动对盘县生物群影响进行综合分析,认为盘县生物群沉积环境与埋藏环境吻合,埋藏于水体较深且宁静、低能的台内盆地中,死亡后就地埋藏。结合古氧化还原度及岩性、生物组合,化石群得以完美埋藏,有三点是至关重要的因素:(1)爬行动物化石层和其他化石缓慢沉积过程中,水体还原缺氧给生物埋藏提供了必须的氧隔离层,防止死亡生物氧化分解;(2)沉积速率慢,岩性结构致密,颗粒细小,使生物能完整保存;(3)赋存盘县生物群地层含多层火山凝灰岩,一些火山凝灰岩层直接覆盖在化石层之上,提示我们火山活动对盘县生物群形成和埋藏起着至关重要的作用。
英文摘要:
      According to sedimentology,pa;aeontology and geochemistry,it analysis the influence of biological assemblage,lithological assemblage and volcanic activity of 2th section,Guanling formation of middle Triassic in Chupiao section to Panxian biota comprehensibly,it’s thought the sedimentary environment of Panxian biota coincide with the buried environment. It buried in deep water and quiet,low energy basin after death. According to paleo oxidation-reduction degree,lithology and biological assemblage,there are 3 reasons for perfect fossils buried:(1)during the slow sedimentation of reptile fossil and other fossils,the reduction of hypoxia in the water provides a necessary oxygen isolation layer for preventing oxidative decomposition of dead organism.(2)Slow deposition rate,the lithological structure is compact and the rock particles are small,so the biological fossils can be preserved completely. (3)the stratigraphy with Panxian biota has multilayers volcanic tuff,some directly cover the fossil layer,the important function of volcanic activity for the formation and bury of Panxian biota can be known.
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