Chloritization of mixed siliciclastic-carbonate rocks: case study from Gydan Peninsula, Russia

IF 1.1 4区 地球科学 Q3 GEOLOGY Carbonates and Evaporites Pub Date : 2024-07-01 DOI:10.1007/s13146-024-00985-y
Kseniia Vasileva, Victoria Ershova, Oleg Vereshchagin, Aleksandr Vilesov, Petr Fedorov
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Abstract

The chlorite group of minerals (chlorites) are well-known phyllosilicates, which have been described from magmatic, metamorphic and sedimentary rocks. Chlorites often appear in the cement of sandstones and can affect their reservoir properties. Here, we present the results of a study on the distribution and composition of chloritized mixed siliciclastic-carbonate rocks from the Middle Ordovician of the Gydan Peninsula, northern Siberia, Russia. This study is based on the first deep well in the area to penetrate the entire 4500-meter-thick sedimentary succession. A number of different carbonate rock textures are found in this area, including rudstone-floatstone (composed almost entirely of calcite), wackestone and packstone (composed of calcite bioclasts and clayey micrite matrix), marl (containing calcite bioclasts, dolomite / ankerite, illite / muscovite, quartz, feldspar and chlorites), and dolomitic marl (composed of illite / muscovite and dolomite / ankerite). Chlorite is represented by chamosite and contains up to 33.5 wt% FeO and up to 0.7 wt% TiO2. Chlorite content positively correlates with illite / muscovite content, reaching a maximum in marls and dolomitic marls (up to 13 vol%). Chlorite crystals are micron-sized and appear as authigenic grains, where they can be distributed in the matrix or form secondary rims around calcite bioclasts and dolomite / ankerite grains. The two main processes leading to chloritization in the studied rocks include illite / muscovite replacement by chlorite and a reaction between illite / muscovite and dolomite / ankerite resulted in chlorite crystallization. Paleotemperatures during chlorite crystallization reached as high as 295–318 °C. Chloritization of the studied carbonate rocks resulted in a porosity reduction, as chlorite rims filled micropores at the contacts with the siliciclastic matrix.

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硅质岩-碳酸盐岩混合岩的氯化作用:俄罗斯吉丹半岛的案例研究
绿泥石类矿物(绿泥石)是著名的植硅酸盐,岩浆岩、变质岩和沉积岩中都有描述。绿泥石经常出现在砂岩的胶结物中,会影响砂岩的储层性质。在此,我们介绍了俄罗斯西伯利亚北部吉丹半岛中奥陶纪绿泥石化混合硅质岩-碳酸盐岩的分布和组成的研究结果。这项研究基于该地区第一口穿透整个 4500 米厚沉积演替的深井。该地区发现了多种不同的碳酸盐岩质,包括浮石-浮岩(几乎完全由方解石组成)、瓦基岩和包岩(由方解石生物碎屑岩和粘土质微晶基质组成)、泥灰岩(含有方解石生物碎屑岩、白云石/绿泥石、伊利石/黝帘石、石英、长石和绿泥石)以及白云质泥灰岩(由伊利石/黝帘石和白云石/绿泥石组成)。绿泥石以绿泥石为代表,含氧化铁高达 33.5 wt%,含二氧化钛高达 0.7 wt%。绿泥石含量与伊利石/黝帘石含量呈正相关,在泥灰岩和白云质泥灰岩中达到最大值(高达 13%)。绿泥石晶体大小为微米级,以自生晶粒的形式出现,可分布在基质中,也可在方解石生物碎屑岩和白云石/绿泥石晶粒周围形成次生边缘。在所研究的岩石中,导致绿泥石化的两个主要过程包括伊利石/褐铁矿被绿泥石置换,以及伊利石/褐铁矿与白云石/闪长岩之间的反应导致绿泥石结晶。绿泥石结晶过程中的古温度高达 295-318 °C。所研究的碳酸盐岩的绿泥石化导致孔隙率降低,因为绿泥石边缘填充了与硅质基质接触处的微孔。
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来源期刊
Carbonates and Evaporites
Carbonates and Evaporites 地学-地质学
CiteScore
2.80
自引率
14.30%
发文量
70
审稿时长
3 months
期刊介绍: Established in 1979, the international journal Carbonates and Evaporites provides a forum for the exchange of concepts, research and applications on all aspects of carbonate and evaporite geology. This includes the origin and stratigraphy of carbonate and evaporite rocks and issues unique to these rock types: weathering phenomena, notably karst; engineering and environmental issues; mining and minerals extraction; and caves and permeability. The journal publishes current information in the form of original peer-reviewed articles, invited papers, and reports from meetings, editorials, and book and software reviews. The target audience includes professional geologists, hydrogeologists, engineers, geochemists, and other researchers, libraries, and educational centers.
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