| 碳酸盐岩中生物潜穴充填特征及其诱导孔隙演化规律——以豫西奥陶系马家沟组三段为例 |
| |
| 引用本文： | 胡亚洲,牛永斌,崔胜利,董小波.碳酸盐岩中生物潜穴充填特征及其诱导孔隙演化规律——以豫西奥陶系马家沟组三段为例[J].沉积学报,2019,37(4):690-701. |
| |
| 作者姓名： | 胡亚洲 牛永斌 崔胜利 董小波 |
| |
| 作者单位： | 1.河南理工大学资源环境学院, 河南焦作 454003; |
| |
| 基金项目： | 国家自然科学基金项目（41102076，41472104）；河南理工大学创新科研团队项目（17IRTSTHN025） |
| |
| 摘 要： | 豫西奥陶系马家沟组三段碳酸盐岩中生物潜穴十分发育。在野外露头实地观测的基础上，利用偏光显微镜、阴极发光显微镜及扫描电镜对研究区碳酸盐岩中生物潜穴的充填特征及其诱导孔隙演化规律进行了研究。结果表明:1）研究区奥陶系碳酸盐岩中生物潜穴多呈全充填和半充填，潜穴充填物主要以白云石和方解石为主，局部生物潜穴呈现未充填状态；2）生物潜穴诱导发育的孔隙，主要有溶蚀孔隙、微裂隙两种类型，在生物潜穴与围岩两者的交界处尤为发育；3）生物潜穴孔隙的发育主要受埋藏白云化作用与海西早期和印支期以来的表生溶蚀作用的影响，浅埋藏白云化作用对晶间孔隙起到促进作用，海西早期的表生溶蚀形成了潜穴中大部分的溶蚀孔隙；4）生物潜穴的选择性溶蚀主要受潜穴中白云石充填物结晶程度的影响，宏观上的选择性溶蚀可划分为四个阶段，微观上的选择性溶蚀主要是粒间孔在流体的作用下逐渐扩大所形成。
|
| 关 键 词： | 生物潜穴 孔隙演化 碳酸盐岩 马家沟组 奥陶系 |
| 收稿时间： | 2018-07-26 |
Characteristics of Filled Burrows in Carbonates and the Evolution of Burrow-mediated Pores: A case study from the third member of the Ordovician Majiagou Formation,western Henan province |
| |
| Institution: | 1.Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo, Henan 454003, China;2.Department of Geology, Northwest University, Xi'an 710069, China;3.Key Laboratory of Biogenic Traces and Sedimentary Minerals of Henan Province, Jiaozuo, Henan 454003, China |
| |
| Abstract: | Numerous burrows occur in the third member of the Ordovician Majiagou Formation in western Henan Province. A study of the filling characteristics of burrows and the evolution of burrow-mediated pores was conducted on burrow-fills in the research area,based on the observation of outcrops together with polarizing optical microscope, cathodoluminescence microscope and scanning electron microscope. The results showed that macro-scale selective dissolution occurred in four stages. (1) Burrows are almost all either fully filled or semi-filled,mostly with calcite or dolomite;occasional burrows are unfilled. (2) Burrow-mediated pores occur commonly,consisting of dissolution pores and micro-cracks,mainly around the burrow boundary. (3) Burrow-mediated pores were controlled by burial dolomitization and dissolution in the early Hercynian cycle and Indo-Chinese epoch. Most of the dissolution pores were formed in the Hercynian period. (4) Burrow-mediated selective dissolution depends on the degree of crystalliza-tion of the dolomite in the burrow-fills. Micro-dissolution pore formation is influenced by the presence of fluids. |
| |
| Keywords: | |
|
| 点击此处可从《沉积学报》浏览原始摘要信息 |
| 点击此处可从《沉积学报》下载免费的PDF全文 |
|
