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Primitive enstatite achondrites

Pilski A. S., Przylibski T. A., Łuszczek K.

Meteorites

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2011

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Vol. 0, No. 0

9-21

EN

Conclusions drawn from the breadth of analytical data on primitive achondrites and enstatite chondrites paired with results of research performed by the authors have led the authors to propose the establishing of a new group of meteorites: primitive enstatite achondrites. The group is defined as the residual remaining after the partial melting of their protolith, which, in the case of primitive enstatite achondrites, is the parent body of enstatite chondrites. In this article are characterized textural features and characteristics of their mineral, chemical, and isotopic composition. The most important of these defining features are the presence of relic chondrules and/or triple junctions of crystal faces, as well as characteristic atomic and molar ratios of main elements: Si, Al, Fe, Mg, Mn and Ca, and particularly the molar ratios Fe/Mn and Fe/Mg. Another important characteristic is the isotopic composition of entrained noble gases, especially ratios of the heaviest of the isotopes and oxygen isotopes, whose values should be close to that typical for enstatite chondrites. It seems likely that the first meteorite to be classified as primitive enstatite achondrite will be the Zakłodzie enstatite achondrite.

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New finds in the Morasko meteorite preserve, Poland

Karwowski Ł., Pilski A. S., Muszyński A., Arnold S., Notkin G., Gurdziel A.

Meteorites

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2011

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Vol. 1, No. 1

21-28

EN

In result of searching in the Morasko preserve for the documentary series Meteorite Men two irons were found below ground. A 544-g shrapnel-like with weak shock deformations, mildly weathered, at low depth, and 34-kg individual, with its upper surface 156 cm deep, with a thick shell of clay and weathering minerals. Of particular interest is presence of chukanovite, a mineral discovered in the Dronino iron meteorite. Morasko is the second meteorite, where chukanovite could be found. The recovery of a new specimen so much deeper than the previous depth record, suggests that further, more detailed surveys should be conducted in the future with improved metal detecting equipment. Moreover, the larger specimen was found embedded in a Miocene clay, which demonstrates that it fell from the sky at that exact spot and was not deposited in glacial terminal moraine.

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Inventory of Polish meteorites

Pilski A. S.

Geological Quarterly

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2001

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Vol. 45, No 3

219-228

EN

Meteorites which fell on or were found in Poland are arranged in chronological order. Each meteorite is described, and specimens preserved in Polish collections are listed.

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Comparative analysis of the Baszkówka and Mt. Tazerzait chondrites: genetic conclusions based on astrophysical data and the mineralogical and petrological data

Pilski A. S., Przylibski T. A., Zagożdżon P. P.

Geological Quarterly

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2001

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Vol. 45, No 3

331-342

EN

The L5 chondrites Baszkówka and Mt. Tazerzait are characterised. Their astronomical, mineralogical and petrological characteristics confirm that these meteorites are similar. They could be derived from the same parent body, though from the different depths below its surface. A third meteorite - the Tjerebon - might have arisen from the same swarm of meteoroids. The parent body to these meteorites in the asteroid belt can not be established at present. The porosity, of these chondrites suggests that they formed close to the surface of their parent asteroid. The process of formation of the parent rock of the Baszkówka chondrite is similar in some respects to sedimentation of a weakly compacted terrestrial sandstone. Thus, a two-stage geological history may be envisaged: firstly formation of the component minerals and mineral aggregates of this meteorite. Then, later in a different environment, the accretion of fragments of this parent material, together with a small amount of matrix, into a strongly porous sedimentary rock.