{"title":"Authigenic Biotite in Quaternary Sediments from the Contact Zone with a Thick Sill, Hole DSDP 485/485A, Gulf of California","authors":"B. A. Sakharov, V. B. Kurnosov","doi":"10.1134/S0024490225700348","DOIUrl":null,"url":null,"abstract":"<p>Authigenic finely dispersed biotite was found in a single sample from Hole DSDP 485/485A, in the southern Gulf of California, south of the Tamayo Fracture Zone. The sample was taken from Quaternary terrigenous sediments that overlie and alternate with several massive basaltic sills of varying thicknesses. It is noteworthy that the biotite makes up practically entire sample. The formation of the biotite is related to the metasomatic transformation of terrigenous clay minerals at the base of the thickest basaltic sill (30.95 m) by hydrothermal fluids, which were mobilized owing to the emplacement of hot magma. The study of the structural, crystallochemical, and morphological features of the biotite from this sample revealed characteristics that are almost identical to those of authigenic biotite recently discovered in Pleistocene terrigenous sediments from the Central Hill in the Escanaba Trough in the southern Gorda Ridge (northeastern Pacific Ocean).</p>","PeriodicalId":18150,"journal":{"name":"Lithology and Mineral Resources","volume":"61 1","pages":"66 - 73"},"PeriodicalIF":0.9000,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Lithology and Mineral Resources","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1134/S0024490225700348","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
Authigenic finely dispersed biotite was found in a single sample from Hole DSDP 485/485A, in the southern Gulf of California, south of the Tamayo Fracture Zone. The sample was taken from Quaternary terrigenous sediments that overlie and alternate with several massive basaltic sills of varying thicknesses. It is noteworthy that the biotite makes up practically entire sample. The formation of the biotite is related to the metasomatic transformation of terrigenous clay minerals at the base of the thickest basaltic sill (30.95 m) by hydrothermal fluids, which were mobilized owing to the emplacement of hot magma. The study of the structural, crystallochemical, and morphological features of the biotite from this sample revealed characteristics that are almost identical to those of authigenic biotite recently discovered in Pleistocene terrigenous sediments from the Central Hill in the Escanaba Trough in the southern Gorda Ridge (northeastern Pacific Ocean).
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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