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DOI | 10.1130/B31693.1 |
Mechanical anisotropies and mechanisms of mafic magma ascent in the middle continental crust: The Sondalo magmatic system (N Italy) | |
Petri, Benoit1,2; Skrzypek, Etienne3; Mohn, Geoffroy4; Mateeva, Tsvetomila5; Robion, Philippe4; Schulmann, Karel1,6; Manatschal, Gianreto1; Muntener, Othmar2 | |
2018 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2018 |
卷号 | 130页码:331-352 |
文章类型 | Article |
语种 | 英语 |
国家 | France; Switzerland; Japan; England; Czech Republic |
英文摘要 | Magma transfer between lower and upper continental crust is a fundamental process linking the dominantly mafic composition of the lower crust with the more felsic composition of the upper crust. We explored the mechanisms of mafic magma ascent and emplacement in the middle crust by studying a midcrustal gabbroic to dioritic magmatic system (Sondalo complex, eastern central Alps, northern Italy). We characterized the structure and anisotropy of magnetic susceptibility (AMS) fabric of concentric gabbroic to dioritic intrusions. The significance of AMS fabrics is discussed using anisotropy of anhysteretic remanent magnetization (AARM) and crystallographic preferred orientation (CPO) data acquired on different test sites. The magmatic and magnetic fabrics of the pluton were acquired during its emplacement in the Permian and were not subsequently tilted: The fabrics are essentially vertical, indicating vertical magma transfer through the crust with a two-phase intrusion history. (1) The concordant orientation between the magmatic foliation and the host-rock xenoliths in the center of the pluton suggests that the first magma ascent phase occurred along pathways subparallel to the vertical fabric of the host metasedi-mentary rocks. (2) The second magma ascent phase was controlled by a change in the rheology of the host rock and the mafic magma. Heat dissipation to the contact aureole induced partial melting, thereby lowering the mechanical strength of the host rocks, whereas the viscosity of the mafic magma increased due to cooling and associated fractional crystallization. This caused an en-masse rise of the pluton, resulting in the formation of a structural aureole, i.e., a vertical foliation in the contact aureole and a weaker but concordant magmatic foliation at the rim of the pluton. This ascent phase accounts for the pressure-temperature evolution recorded by metasedimentary rocks in the contact aureole of the pluton. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000418364200017 |
WOS关键词 | COMPLEX CENTRAL ALPS ; IVREA-VERBANO ZONE ; MAGNETIC-SUSCEPTIBILITY ANISOTROPY ; CENTRAL SIERRA-NEVADA ; GRANITIC MAGMA ; WESTERN ALPS ; SHEAR ZONE ; EASTERN ALPS ; EMPLACEMENT ; INTRUSION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24360 |
专题 | 地球科学 |
作者单位 | 1.Univ Strasbourg, Inst Phys Globe Strasbourg, Ecole & Observ Sci Terre, CNRS,UMR7516, 1 Rue Blessig, F-67084 Strasbourg, France; 2.Univ Lausanne, Inst Sci Terre, CH-1015 Lausanne, Switzerland; 3.Kyoto Univ, Grad Sch Sci, Dept Geol & Mineral, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan; 4.Univ Cergy Pontoise, Dept Geosci & Environm, 5 Mail Gay Lussac, F-95031 Neuville Sur Oise, Cergy Pontoise, France; 5.Univ Liverpool, Dept Earth & Ocean Sci, Liverpool L69 3BX, Merseyside, England; 6.Czech Geol Survey, Ctr Lithospher Res, Prague 11821 1, Czech Republic |
推荐引用方式 GB/T 7714 | Petri, Benoit,Skrzypek, Etienne,Mohn, Geoffroy,et al. Mechanical anisotropies and mechanisms of mafic magma ascent in the middle continental crust: The Sondalo magmatic system (N Italy)[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2018,130:331-352. |
APA | Petri, Benoit.,Skrzypek, Etienne.,Mohn, Geoffroy.,Mateeva, Tsvetomila.,Robion, Philippe.,...&Muntener, Othmar.(2018).Mechanical anisotropies and mechanisms of mafic magma ascent in the middle continental crust: The Sondalo magmatic system (N Italy).GEOLOGICAL SOCIETY OF AMERICA BULLETIN,130,331-352. |
MLA | Petri, Benoit,et al."Mechanical anisotropies and mechanisms of mafic magma ascent in the middle continental crust: The Sondalo magmatic system (N Italy)".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 130(2018):331-352. |
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