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贵州遵义松林地区中上寒武统娄山关群 混积特征及其地质意义
Mixed-sedimentation characteristics of Middle-Upper Cambrian Loushanguan Group, Songlin area, Zunyi City, Guizhou Province: Their geological significance
张祎蕾1,2,3 谭秀成1,2 张本健3
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DOI:
作者单位:1. 西南石油大学地球科学与技术学院  2. 中国石油天然气集团有限公司碳酸盐岩储层重点实验室西南石油大学研究分室 3. 中国石油西南油气田分公司川西北气矿
中文关键字:中、晚寒武世 娄山关期 混合沉积 黔北松林地区 碳酸盐岩 储层
英文关键字:Middle and Late Cambrian; Loushanguan ; Mixed sedimentation; Songlin area in northern Guizhou Province; Carbonates; Reservoir
中文摘要:    贵州省遵义松林地区中上寒武统娄山关群发育有陆源碎屑岩和海相碳酸盐岩的混合沉积。通过野外剖面实测和镜下薄片鉴定,结合前人的研究结果,对贵州遵义松林地区中上寒武统娄山关群的混积特征进行详细的研究。研究结果表明:①娄山关群混合沉积在微观上表现为碳酸盐岩组分与碎屑岩组分混合形成的混积岩,在宏观上表现为碎屑岩与碳酸盐岩呈夹层的形式沉积、碳酸盐岩与混积岩交互沉积以及混积岩本身交互沉积形成的混积岩层系;②其混合沉积类型有渐变式混合沉积、突变式混合沉积;③上扬子地区娄山关群为碳酸盐岩台地混合沉积模式,推测其陆源碎屑物质来自康滇古陆,间接证明其处于隆起剥蚀状态;④由渐变式混合沉积和陆源碎屑含量向上呈现两次减少—增加的过程反映两次三级海侵—海退旋回;泥质含量向上减少和颗粒含量的变化可推断沉积环境由混积潮坪向台内滩夹滩间演化;⑤风暴浊积岩与突变式混合沉积的伴生关系说明处于中低纬度地区是形成混合沉积的重要条件。因此混合沉积的研究对于指示康滇古陆隆升以及岩相古地理有重要意义。
英文摘要:    Mixed sedimentation of both terrigenous clastics and marine carbonates is developed in Middle-Upper Cambrian Loushanguan Group, Songlin area, Zunyi City, Guizhou Province. So, based on field outcrop measurement and thin-section identification, combined with many previous research results, some mixed-sedimentation characteristics were analyzed. Results show that (1) this mixed sedimentation of Loushanguan Group is microscopically embodied as diamictite, which is a mixture constituent of both carbonates and clastics, whereas macroscopically as diamictite strata composed of one sedimentation of clastics interbedded with carbonates, one alternative sedimentation of carbonates and diamictite, and another alternative sedimentation of diamictite itself; (2) there are two types of mixed sedimentation, i.e., gentle type and salutatory type; (3) the Loushanguan Group, Upper Yangtze region, is one mixed-sedimentation model of carbonate platform, inferring terrigenous clastics from Kangdian ancient land, also indirectly proving to be in a state of uplift and denudation; (4) the gentle mixed sedimentation and clastic content of two upward reducing-increasing terrigenous processes reflect two cycles of three-level transgression-regression. It can be inferred from the upward reduction of mud content and the change of particle content that sedimentary environment evolves from diamict tidal flat to intra-platform bank and interbank; and (5) an association between storm turbidite and salutatory mixed sedimentation indicates that being located in low to middle latitudes is an important condition to form mixed sedimentation. Therefore, its study is of great significance to indicating the uplift of Kangdian ancient land and the lithofacies palaeogeography.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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