Peculiarities of Clay Mineral Formation in Pleistocene Sediments Under Specific Tectonomagmatic and Hydrothermal Conditions of the Central Hill (Escanaba Trough, Gorda Ridge, Pacific Ocean): Communication 1. Hole ODP 1038B

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Lithology and Mineral Resources Pub Date : 2024-09-02 DOI:10.1134/s0024490224700652

V. B. Kurnosov, B. A. Sakharov, Yu. I. Konovalov, A. T. Savichev, I. A. Morozov, D. M. Korshunov

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Abstract—

Using a complex of analytical methods, clay minerals were studied in Pleistocene sediments from Hole ODP 1038B (120.50 m deep), drilled on the northwestern edge of the Central Hill (Escanaba Trough, Gorda Ridge) near the hydrothermal source with a temperature of 108°C, as well as in Pleistocene background terrigenous sediments from reference Hole ODP 1037B, drilled in the Escanaba Trough 5 km south of the Central Hill. The terrigenous clay mineral assemblage in sediments from Hole 1037B consists of the mixed-layer smectite-illites, smectite, chlorite, illite, and kaolinite. Sediments from Hole 1038B in the interval from the bottom surface to a depth of 5–7 m are composed of terrigenous clay minerals. In the rest of the sedimentary section, clay minerals are represented by the newly formed biotite, chlorite, and dioctahedral smectite. They were formed during the basaltic melt intrusion into the Escanaba Trough with the formation of a laccolith and the subsequent rapid cooling of its flank. The intrusion was accompanied by the ascent of high-temperature hydrothermal fluid in the central discharge channel, interacting with the adjacent sediments. As a result, the fine-dispersed biotite was formed in sediments at the high-temperature stage of this interaction due to the primary terrigenous clay minerals, K-feldspar, and amphiboles. The rapid cooling of the hydrothermal fluid to a temperature of presumably 270–330°C promoted the partial replacement of biotite by chlorite. The further rapid cooling of the hydrothermal fluid to 200°C and lower and its mixing with seawater seeping into sediments of the Central Hill fostered the formation of smectite.

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中央山（埃斯卡纳巴海槽，戈尔达海脊，太平洋）更新世沉积物在特定构造地质和热液条件下粘土矿物形成的特殊性：通讯 1.ODP 1038B 孔

摘要--采用多种分析方法，研究了在中央山西北边缘（埃斯卡纳巴海槽，戈尔达海脊）热液源附近钻探的温度为 108°C 的 ODP 1038B 孔（120.50 米深）中的更新世沉积物以及在中央山以南 5 公里处的埃斯卡纳巴海槽钻探的 ODP 1037B 参考孔中的更新世背景土著沉积物中的粘土矿物。1037B 号钻孔沉积物中的陆相粘土矿物组合包括混层埃希石-叶腊石、埃希石、绿泥石、伊利石和高岭石。1038B 号钻孔底面至 5-7 米深度区间的沉积物由陆相粘土矿物组成。在沉积剖面的其余部分，粘土矿物的代表是新形成的黑云母、绿泥石和二八面体直闪石。它们是在玄武岩熔体侵入埃斯卡纳巴海槽时形成的，当时形成了一块裂隙岩，随后其侧翼迅速冷却。在侵入的同时，高温热液在中央排放通道上升，与邻近的沉积物相互作用。因此，在这种相互作用的高温阶段，沉积物中形成了细小分散的生物岩，这是由于原生陶土粘土矿物、钾长石和闪长石的作用。热液迅速冷却到大概 270-330°C 的温度，促进了绿泥石对生物岩的部分置换。热液进一步快速冷却到 200°C 或更低的温度，并与渗入中央山沉积物的海水混合，促进了闪长岩的形成。

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来源期刊

Lithology and Mineral Resources 地学-地球化学与地球物理

CiteScore

1.30

自引率

37.50%

发文量

审稿时长

>12 weeks

期刊介绍： Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rock and ore formation with present-day processes. The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as the genetic aspects of the formation of sedimentary and hydrothermal–sedimentary mineral resources. The journal welcomes manuscripts from all countries in the English or Russian language.