Patterns of Transformations in the Compositions and Properties of Icelandic Hyaloclastites during Lithogenesisстатья

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Дата последнего поиска статьи во внешних источниках: 9 ноября 2017 г.

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[1] Frolova Y. V. Patterns of transformations in the compositions and properties of icelandic hyaloclastites during lithogenesis // Moscow University Geology Bulletin. — 2010. — Vol. 65, no. 2. — P. 104–114. In Iceland, hyaloclastites form thick masses generated as a result of subglacial eruptions during Pliocene–Pleistocene surface glaciations. The formation of hyaloclastites and features of their alterations during lithogenesis were investigated. Hyaloclastites are extremely heterogeneous in their physical and physical–mechanical properties. A sequence of hyaloclastites secondary transformations was established from virgin, only slightly palagonitized hyaloclastites with contacttype cement to thoroughly transformed rocks with secondary minerals forming porous cement and partially substituting volcanic glass. A general tendency towards an increase in elasticity, density, strength, and thermal characteristics and towards a decrease in porosity and permeability has been observed with progression of secondary alterations, with the growth of age, from newer to more ancient deposits, and the depth of hyaloclastite burial. [ DOI ]

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