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 2. Holes ODP 1038A and 1038H

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
V. B. Kurnosov, B. A. Sakharov, Yu. I. Konovalov, A. T. Savichev, I. A. Morozov, D. M. Korshunov
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Abstract

Clay minerals were studied in Pleistocene sediments from Hole 1038А (114.50 m deep) and Hole 1038Н (192.80 m deep) drilled near a hydrothermal vent with a temperature of 217°C on Central Hill, 275 m east of Hole 1038B. In sediments from Hole 1038A, at a depth of 8.52 m, <0.001-mm fraction consists completely of chlorite. In the rest of the sediment section in Hole 1038A, clay minerals consist of chlorite (from ~64 to ~98%) and illite. In sediments from Hole 1038H, clay minerals also consist of chlorite and illite. They were formed under conditions related to the intrusion of a basaltic melt as laccolith into the Escanaba Trough and the heating under its influence of a solution, during the interaction of which with sediments at a high-temperature stage biotite was formed. During the subsequent slow cooling of the laccolith and fluid, the newly formed biotite was replaced completely by chlorite. Illite was precipitated from a hydrothermal solution. At a depth of 183 m, in sediments from Hole 1038H, clay minerals consist of biotite, chlorite, and dioctahedral smectite, just as in sediments from Hole 1038B during their formation under conditions of rapid cooling of the laccolith flank and penetration of sea water into the sediments. The paper shows similarities and dissimilarities in the formation of clay minerals in Pleistocene sediments of the Central Hill, located above the slowly cooling part of the laccolith (Holes 1038A and 1038H) and in sediments located above the rapidly cooling laccolith flank (Hole 1038B).

Abstract Image

在中央山(埃斯卡纳巴海槽、戈尔达海脊、太平洋)特定构造地质和热液条件下更新世沉积物中粘土矿物形成的特殊性:通讯 2.ODP 1038A 和 1038H 号钻井
在 1038B 孔以东 275 米的中央山一个温度为 217°C 的热液喷口附近钻探的 1038А孔(深 114.50 米)和 1038Н孔(深 192.80 米)的更新世沉积物中研究了粘土矿物。在 1038A 号钻孔 8.52 米深处的沉积物中,0.001 毫米的部分完全由绿泥石组成。在 1038A 号钻孔沉积物的其他部分,粘土矿物由绿泥石(从 ~64% 到 ~98%)和伊利石组成。在 1038H 号钻孔的沉积物中,粘土矿物也由绿泥石和伊利石组成。它们的形成条件与玄武岩熔体作为裂隙岩侵入埃斯卡纳巴海槽以及在其影响下溶液加热有关,在溶液与沉积物的相互作用过程中,在高温阶段形成了黑云母。在随后的岩床和流体缓慢冷却过程中,新形成的黑云母被绿泥石完全取代。伊利石从热液中析出。在深度为 183 米的 1038H 号钻孔沉积物中,粘土矿物由黑云母、绿泥石和二八面体闪长岩组成,这与 1038B 号钻孔沉积物在裂隙岩侧面快速冷却和海水渗入沉积物的条件下形成时的情况相同。本文展示了位于岩溶缓慢冷却部分上方的中央山更新世沉积物(1038A 和 1038H 号钻孔)和位于岩溶快速冷却侧翼上方的沉积物(1038B 号钻孔)中粘土矿物形成的异同。
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来源期刊
Lithology and Mineral Resources
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
29
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.
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