Maryborough, a new H5 meteorite find from Victoria, Australia

Q4 Earth and Planetary Sciences

Proceedings of the Royal Society of Victoria Pub Date : 2019-01-01 DOI:10.1071/RS19002

W. Birch, D. Henry, A. Tomkins

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引用次数: 1

Abstract

The Maryborough meteorite is a new H5 ordinary chondrite discovered about 2 km south of Maryborough, Victoria, in May 2015. It is a single stone measuring approximately 39 × 14 × 14 cm and with a mass of 17 kg. Plentiful indistinct chondrules are up to 1 mm across in a strongly recrystallised plagioclase-bearing matrix. Olivine and orthopyroxene in both the matrix and chondrules are uniform in composition (Fo80.1Fa19.3Te0.5Ca-ol0.04 and En81.5Fs17.1Wo1.5 respectively).The main metallic phases present are kamacite, taenite and tetrataenite, often forming composite grains with troilite. There is no evidence for any shock-inducing event and the meteorite shows incipient weathering in the form of thin iron-oxide mantles around the Fe–Ni grains. A terrestrial age of less than 1000 years is estimated from C14 dating. While there are a number of historic reported meteor sightings in the Maryborough district, none can be tied to the meteorite’s find site. To date, Maryborough is the third H5 ordinary chondrite and the second largest single chondritic mass, after Kulnine (55 kg), found in Victoria.

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Maryborough，澳大利亚维多利亚新发现的H5陨石

玛丽伯勒陨石是一颗新的H5普通球粒陨石，于2015年5月在维多利亚玛丽伯勒以南约2公里处发现。它是一块单独的石头，尺寸约为39 × 14 × 14厘米，质量为17公斤。在含斜长石的强再结晶基质中，有大量不明显的球粒，直径可达1mm。基质和球粒中的橄榄石和正辉石组成均匀(分别为Fo80.1Fa19.3Te0.5Ca-ol0.04和En81.5Fs17.1Wo1.5)。主要金属相为绢云石、带状长石和四长石，常与绢云石形成复合晶粒。没有证据表明有任何激波引起的事件，陨石显示了铁-镍颗粒周围的薄氧化铁地幔的早期风化。根据C14测年法估计，地球的年龄小于1000年。虽然在玛丽伯勒地区有许多历史上报道的流星目击事件，但没有一个可以与陨石的发现地点联系起来。迄今为止，Maryborough是第三个H5普通球粒陨石，也是第二大单一球粒陨石，仅次于在维多利亚发现的Kulnine(55公斤)。

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来源期刊

Proceedings of the Royal Society of Victoria Earth and Planetary Sciences-Geology

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0.50

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0.00%

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期刊介绍： The Royal Society of Victoria has been an active and vital part of Melbourne"s scientific heritage since 1854. Membership is open to anyone interested in science and the promotion of science. Located in the heart of Melbourne, the Society"s Hall at 9 Victoria Street is the venue for an interesting program of scientific lectures, symposia and events to promote the sciences to the Victoria and Australian community. These lectures are open to the public.