AMS-detection of inverse fabrics without AARM, in ophiolite dikes

被引：24

作者：

Borradaile, GJ ^{[1
]}

Gauthier, D ^{[1
]}

机构：

[1] Lakehead Univ, Dept Geol, Thunder Bay, ON P7B 5E1, Canada

来源：

GEOPHYSICAL RESEARCH LETTERS | 2001年 / 28卷 / 18期

关键词：

D O I：

10.1029/2001GL012976

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Inverse fabric contributions from single-domain (SD) magnetite complicate interpretation of magmatic flow from anisotropy of magnetic susceptibility (AMS) in the S. Troodos ophiolite. dike swarm. Flow directions and magma chamber dimensions may only be inferred correctly if magnetic fabrics correspond to the orientation distribution (OD) of minerals. Magnetite shape-fabrics were isolated by anisotropy of anhysteretic remanence (AARM) but AMS ambiguously merges magnetite and silicate fabrics. However, with the retrospective benefit of AARM, in this area, we recommend avoiding SD complications by excluding magnetite-rich samples for which the bulk low-field susceptibility > 27,500 mu SI. Magma-flow was steeply upwards to the SW proximal to an axial magma chamber.

引用

页码：3517 / 3520

页数：4

共 19 条

[1] Evidence from gabbro of the Troodos ophiolite for lateral magma transport along a slow-spreading mid-ocean ridge [J].

Abelson, M ;

Baer, G ;

Agnon, A .

NATURE, 2001, 409 (6816) :72-75

[2]

BONHOMMET N, 1988, GEOLOGY, V16, P422, DOI 10.1130/0091-7613(1988)016<0422:PAFBRA>2.3.CO

[3]

[4] Paleomagnetic vectors and tilted dikes [J].

Borradaile, GJ .

TECTONOPHYSICS, 2001, 333 (3-4) :417-426

[5] Tectonic applications of magnetic susceptibility and its anisotropy [J].

Borradaile, GJ ;

Henry, B .

EARTH-SCIENCE REVIEWS, 1997, 42 (1-2) :49-93

[6]

Dilek Y, 1998, GEOPH MONOG SERIES, V106, P219

[7] EVIDENCE FROM MAGNETIC FABRIC FOR THE FLOW PATTERN OF MAGMA IN THE MACKENZIE GIANT RADIATING DYKE SWARM [J].

ERNST, RE ;

BARAGAR, WRA .

NATURE, 1992, 356 (6369) :511-513

[8] ANISOTROPY OF MAGNETIC REMANENCE - A BRIEF REVIEW OF MINERALOGICAL SOURCES, PHYSICAL ORIGINS, AND GEOLOGICAL APPLICATIONS, AND COMPARISON WITH SUSCEPTIBILITY ANISOTROPY [J].

JACKSON, M .

PURE AND APPLIED GEOPHYSICS, 1991, 136 (01) :1-28

[9] MAGMA FLOW DIRECTIONS IN DIKES OF THE KOOLAU COMPLEX, OAHU, DETERMINED FROM MAGNETIC FABRIC STUDIES [J].

KNIGHT, MD ;

WALKER, GPL .

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS, 1988, 93 (B5) :4301-4319

[10]

MACLEOD CJ, 1995, GEOLOGY, V23, P257, DOI 10.1130/0091-7613(1995)023<0257:OTSOSO>2.3.CO

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