意大利Mt.Faito地区白垩纪早阿普第期浅水碳酸盐岩沉积微相及其环境演化
- 1. 中国地质大学(北京)能源学院, 北京 100083;
- 2. 中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室, 北京 100083;
- 3. 意大利那不勒斯费德里克二世大学地球环境与资源科学系, 那不勒斯 80138
基金项目:
国家科技重大专项(2017ZX05005-002-003,2017ZX05009-002);中国科学院战略先导项目(XDA14010201-02)
作者简介:
孙青青,女,1995年出生,硕士研究生,碳酸盐岩层序地层与沉积学,E-mail:zgdzdxbjsqq@163.com
- 收稿日期:
2018-05-23
- 修回日期:
2018-08-30
- 刊出日期:
2019-08-10
摘要: 通过对白垩纪早阿普第期Mt.Faito野外露头剖面宏观特征描述及室内岩石薄片分析,根据岩性及沉积特征变化,将其划分为A、B、C三个地层单元:A以潮下带粒泥灰岩为主,时有生物碎屑粒泥灰岩-泥粒灰岩夹层沉积;B以潮下带双壳类漂浮岩沉积为主,基质多为生屑泥粒灰岩;C与下伏地层呈不整合接触,该单元岩性变化复杂,整体以潮下带-潮上带沉积环境为主,偶尔发育潟湖沉积。根据三个地层单元所发育的骨架生物颗粒类型,可将地层A、B和C划分为"Chlorozoan"、"Chlorozoan&Foramol"、"Foramol&Microbial"三种不同组合的生物颗粒沉积。其沉积环境演变如下:A为暖水贫营养的水体环境,B为暖水富营养环境,而C则主要为温水富营养环境。基于Mt.Faito剖面的生物沉积特征及碳同位素数据可知,由温度、CO2及水体营养物质增加所引起的早白垩世生物沉积及其环境演化具全球性。
Microfacies Analysis of Lower Aptian (Cretaceous) Shallow-water Carbonate in the Mt.Faito Section, Italy
- 1. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;
- 2. Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, China University of Geosciences(Beijing), Beijing 100083, China;
- 3. Department of Earth, Environment and Resources Sciences, University of Naples FedericoⅡ, Naples 80138, Italy
Funds:
National Science and Technology Major Project, No. 2017ZX05005-002-003, 2017ZX05009-002; Strategic Priority Research Program of the Chinese Academy of Sciences, No. XDA14010201-02
- Received Date:
2018-05-23
- Rev Recd Date:
2018-08-30
- Publish Date:
2019-08-10
Abstract: Three distinct lithostratigraphic units A,B,and C have been recognized according to field work and thin section observations. The crudely stratified Unit A deposited in subtidal environments is characterized by monotonous wackstone intercalated with bioclastic wackstone-packstone. The well-bedded Unit B consists largely of bivalve float-stones in a matrix of bioclastic packstone deposited in subtidal conditions. Unit C,disconformably overlying Unit B, is composed of complex lithofacies associations that deposit in variable environments from subtidal to supratidal set-tings,sometimes in lagoon environments. According to the biota range chart and stable carbon isotope data from the Mt. Faito section,which can be used to analyze the biosedimentary diversity,different climatic and sea water condi-tions can be inferred as well. Unit A is characterized by a "Chlorozoan" association,which indicates warm and oligo-trophic conditions;Unit B is dominated by "Chlorozoan" and "Foramol" associations that indicate relatively warm and mesotrophic conditions;and Unit C is a combination of "Microbial" and "Foramol" associations,hence mesotro-phic and temperate thermal conditions. Therefore,local early Aptian biosedimentary shifts and paleoenvironmental turnovers exerted by the increasing temperature,CO2,and nutrient contents have been interpreted on a global scale by analyzing the biosedimentary evolvement and correlating the C-isotope curve with those of other early Cretaceous carbonate platforms and basins worldwide.
孙青青, 樊太亮, Roberto Graziano, 吴俊. 意大利Mt.Faito地区白垩纪早阿普第期浅水碳酸盐岩沉积微相及其环境演化[J]. 沉积学报, 2019, 37(4): 723-734. doi: 10.14027/j.issn.1000-0550.2018.166
SUN QingQing, FAN TaiLiang, Roberto Graziano, WU Jun. Microfacies Analysis of Lower Aptian (Cretaceous) Shallow-water Carbonate in the Mt.Faito Section, Italy[J]. Acta Sedimentologica Sinica, 2019, 37(4): 723-734. doi: 10.14027/j.issn.1000-0550.2018.166
Citation: |
SUN QingQing, FAN TaiLiang, Roberto Graziano, WU Jun. Microfacies Analysis of Lower Aptian (Cretaceous) Shallow-water Carbonate in the Mt.Faito Section, Italy[J]. Acta Sedimentologica Sinica, 2019, 37(4): 723-734. doi: 10.14027/j.issn.1000-0550.2018.166
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