欧龙布鲁克地块古生代风暴沉积特征及地质意义

发布时间：2018-06-21 09:46

本文选题：欧龙布鲁克地块 + 古生代　；参考：《沉积学报》2017年01期

【摘要】：为进一步研究欧龙布鲁克地块古生界频繁发育的风暴沉积所暗含的地质信息,探讨风暴频发型古气候对柴北缘地区古生代沉积的影响,对研究区古生界各剖面进行了详细的野外勘察及室内实验等综合分析,以底面侵蚀构造、砾屑结构、化石滞留层、丘状交错层理以及同沉积涡流侵蚀构造等作为典型的沉积构造标志,识别出包括风暴高峰期、原地卸载期、回流期、涡流期以及停息期等风暴作用不同阶段产物。根据不同阶段风暴产物的组合形式,将出露的多套风暴沉积划分为代表不同沉积环境下的风暴序列类型,其中早古生代发育5种原地或近源型风暴沉积序列,晚古生代则发育对应原地搅动型、近源型以及深水缓坡型风暴沉积的风暴沉积序列。再综合研究区各古生界剖面的岩性等特征,印证了欧龙布鲁克地块早古生代为持续海侵的浅海环境,而晚古生代则整体处于陆表海环境下海陆过渡相沉积的环境变化特征。
[Abstract]:In order to further study the geological information implied by the frequently developed storm deposits in the Paleozoic of the Orombrook block, the influence of the frequent storm paleoclimate on the Paleozoic sediments in the northern margin of Qaidam is discussed. The detailed field investigation and laboratory experiments were carried out on the sections of Paleozoic in the study area. As typical indicators of sedimentary structure, cumulus staggered bedding and synsedimentary eddy current erosion structure can identify the products of different stages of storm action, such as storm peak period, in situ unloading period, reflux period, eddy current period and stationary period. According to the combination forms of storm products in different stages, the outcrop storm deposits are divided into storm sequences representing different sedimentary environments, among which five types of in-situ or near-source storm deposition sequences developed in the early Paleozoic. The late Paleozoic developed storm deposition sequences corresponding to in situ agitation type, near source type and deep water gentle slope type storm deposition. The lithology and other characteristics of the Paleozoic sections in the study area confirm that the early Paleozoic of the Oulong Brook block is the shallow sea environment of continuous transgression, while the late Paleozoic is the environment variation of the transcontinental transitional facies deposition in the continental epicontinental sea environment as a whole.
【作者单位】：中国石油大学(华东)地球科学与技术学院;
【基金】：中国地质调查局项目(12120115003301)~~
【分类号】：P512.2

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