引用本文: 孙宝亮, 梁俊红, 温守钦, 崔卫利. 辽宁本溪牛毛岭马家沟组顶部剖面微相分析与沉积环境[J]. 地质与资源, 2021, 30(6): 646-655, 665. doi: 10.13686/j.cnki.dzyzy.2021.06.002 Citation: SUN Bao-liang, LIANG Jun-hong, WEN Shou-qin, CUI Wei-li. MICROFACIES ANALYSIS AND SEDIMENTARY ENVIRONMENT OF THE SECTION OF TOP MAJIAGOU FORMATION IN NIUMAOLING SCENIC AREA OF BENXI CITY, LIAONING PROVINCE[J]. Geology and Resources , 2021, 30(6): 646-655, 665. doi: 10.13686/j.cnki.dzyzy.2021.06.002 作者简介: 孙宝亮(1970-), 男, 硕士, 讲师, 从事沉积相和沉积环境研究工作, 通信地址辽宁省沈阳市和平区文化路东北大学265信箱, E-mail// [email protected]

中图分类号: P588.24

牛毛岭马家沟组顶部剖面位于本溪国家地质公园牛毛岭景区的东部.通过对碳酸盐岩的微相分析，恢复了马家沟组顶部剖面沉积环境并总结了沉积环境变化规律.依据标本研究划分出14种微相类型，包括1种风暴岩微相类型、9种缓坡微相类型、3种标准微相类型和1种自定义微相类型.此剖面自下而上划分为3个低能型向上变浅潮缘旋回.旋回一的沉积环境由内缓坡的潮缘或潟湖，至沙滩和沙堤，至潮汐水道的潮缘；旋回二沉积环境由局限或开放的内缓坡，至潮缘的浅潮下带和个别层位的潮间、潮上带；旋回三最为典型，沉积环境由灰色灰岩的中缓坡，至潮缘，再到黄色调碳酸盐岩的潮缘浅潮下带，至潮间、潮上带的蒸发潟湖，至干旱气候下潮间、潮上带的蒸发海岸.推断染色的Fe ³⁺ 和黏土矿物为陆源，此剖面点处是碳酸盐岩孤岛（洲）的潮缘环境.

Abstract:

The section of top Majiagou Formation is located in the east of Niumaoling Scenic Area of Benxi National Geopark. The sedimentary environment of the section is restored and its change rules are summarized through the microfacies analysis of carbonate rocks. According to the study of specimens, 14 microfacies types are classified, including 1 tempestite microfacies type, 9 gentle slope microfacies types, 3 standard microfacies types and 1 custom microfacies type. The section can be divided into 3 low-energy upward-shallowing tidal margin cycles from bottom to top: The sedimentary environment of Cycle I is tidal margin or lagoon of inner gentle slope-sandbeach and sand bank-tidal margin of tide gate; The sedimentary environment of Cycle II is from limited or open inner gentle slope to shallow subtidal zone of tidal margin and intertidal-supratidal zone of individual layer; The Cycle III is the most typical, with the sedimentary environment from the middle gentle slope of gray limestone, to tidal margin, then to the tidal margin shallow subtidal zone of yellow carbonate rocks, to the evaporative lagoons of intertidal-supratidal zones, and to the evaporative coast of intertidal-supratidal zones in arid climate. It is inferred that the stained Fe ³⁺ and clay minerals are of terrigenous origin, and the section point is the tidal margin environment of carbonate rock island (bar).

Key words: carbonate rock sedimentary microfacies sedimentary environment Majiagou Formation Liaoning Province

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Geological sketch map of Benxi City with position of Niumaoling section (From Reference [ 1 ])

Figure 2.

Division and correlation of Middle Ordovician stratigraphy in the eastern North China Plate (Modified from References [ 5 - 6 ])

Figure 3.

Microphotographs of microfacies type RMF 22

Figure 4.

Microphotographs of microfacies types

Figure 5.

Microphotographs of microfacies types and anhydrite pseudomorphs

Figure 6.

Comprehensive column for the section of top Majiagou Formation in Niumaoling Scenic Area