Reinvestigating the Dufek Intrusion, through joint gravity and magnetic models

IF 2.4 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Tom A. Jordan, Teal R. Riley
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引用次数: 0

Abstract

The Dufek layered mafic intrusion represents the only exposed, deep-seated, part of the Ferrar Large Igneous Province, which extends >3500 km across Antarctica and into parts of Tasmania and New Zealand. The Dufek Intrusion is in a key position at the boundary between the Jurassic Weddell Sea Rift System and the East Antarctic Craton. It may have been a conduit for some of the Ferrar magmas, or a deep-seated equivalent to the shallower sills seen in other sectors of Antarctica. Although a significant intrusion, equivalent at least to the Stillwater complex in the USA, its true scale and geometry, along with the relative timing of emplacement is disputed. We present new 3D models of gravity and magnetic data which constrain the geometry of the intrusion, show how separate lobes of the intrusion are linked and identify a possible extension of the intrusion to the east. We also discuss the implications for how the intrusion may have been emplaced.

Abstract Image

通过重力和磁力联合模型重新研究杜菲克侵入区
杜菲克层状岩浆侵入体是费拉尔大火成岩带唯一暴露的深层部分,该熔岩带横跨南极洲,延伸至塔斯马尼亚和新西兰部分地区,全长3500千米。杜菲克侵入体位于侏罗纪威德尔海裂谷系统和南极东部克拉通之间边界的关键位置。它可能是一些费拉尔岩浆的导管,也可能是南极洲其他地区较浅火山岩的深层侵入体。虽然这是一个重要的侵入体,至少相当于美国的 Stillwater 复合体,但其真实规模和几何形状以及相对的形成时间还存在争议。我们介绍了新的重力和磁力数据三维模型,这些数据限制了侵入体的几何形状,显示了侵入体的独立裂片是如何联系在一起的,并确定了侵入体向东延伸的可能性。我们还讨论了侵入体如何形成的影响。
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来源期刊
Physics of the Earth and Planetary Interiors
Physics of the Earth and Planetary Interiors 地学天文-地球化学与地球物理
CiteScore
5.00
自引率
4.30%
发文量
78
审稿时长
18.5 weeks
期刊介绍: Launched in 1968 to fill the need for an international journal in the field of planetary physics, geodesy and geophysics, Physics of the Earth and Planetary Interiors has now grown to become important reading matter for all geophysicists. It is the only journal to be entirely devoted to the physical and chemical processes of planetary interiors. Original research papers, review articles, short communications and book reviews are all published on a regular basis; and from time to time special issues of the journal are devoted to the publication of the proceedings of symposia and congresses which the editors feel will be of particular interest to the reader.
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