Markus Patzek

Markus Patzek
University of Münster | WWU · Institute of Planetology

Dr. rer. nat.

About

35
Publications
4,556
Reads
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318
Citations
Citations since 2016
34 Research Items
318 Citations
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2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Introduction

Publications

Publications (35)
Article
Full-text available
Thermal fatigue has been proven to be of fundamental importance for the nature and evolution of surfaces of airless bodies in the solar system. It is a rock erosive process acting in conjunction with meteoroid bombardment. We set up an experiment to simulate the diurnal temperature variation at 1 AU of centimeter sized sample cubes using a liquid n...
Article
On July 15, 2021, a huge fireball was visible over Poland. After the possible strewn field was calculated, the first and so far only sample, with a mass of 350 g, was discovered 18 days after the fireball event. The Antonin meteorite was found August 3, 2021, on the edge of a forest close to a dirt road near Helenow, a small suburb of the city of M...
Article
MS‐MU‐012, a 15.5 g clast from the Almahata Sitta polymict ureilite, is the first known plagioclase‐bearing main group ureilite. It is a coarse‐grained (up to 4 mm), equilibrated assemblage of 52% olivine (Fo 88), 13% orthopyroxene (Mg# 89.2, Wo 4.5), 11% augite (Mg# 90.2, Wo 37.3), and 14% plagioclase (An 68), plus minor metal and sulfide. The pla...
Article
On April 23rd, 2019, the Aguas Zarcas meteorite fall occurred in Costa Rica. Because the meteorite was quickly recovered, it contains valuable extraterrestrial materials that have not been contaminated by terrestrial processes. Our X-ray computed tomography (XCT) and scanning electron microscopy (SEM) results on various pre-rain fragments from earl...
Article
Like many airless planetary surfaces, the surface of the Moon is scattered by populations of blocks and smaller boulders. These features decrease in abundance with increasing exposure time due to comminution by impact bombardment and produce regolith. Here we model the evolution of block size–frequency distributions by updating the model of Hörz et...
Article
On October 7, 2008, the asteroid 2008 TC3 exploded as it entered the Earth’s atmosphere, producing significant dust (in the atmosphere) and delivering thousands of stones in a strewn field in Sudan, collectively known as the Almahata Sitta (AhS) stones. About 600 fragments were officially recovered in 2008 and 2009. Further rocks were collected sin...
Preprint
Full-text available
Like many airless planetary surfaces, the surface of the Moon is scattered by populations of blocks and smaller boulders. These features decrease in abundance with increasing exposure time due to comminution by impact bombardment and produce regolith. Here we model the evolution of block size-frequency distributions by updating the model of Hoerz e...
Article
Full-text available
On April 23, 2019, a meteorite fall occurred in Aguas Zarcas, Costa Rica. According to the Meteoritical Bulletin, Aguas Zarcas is a brecciated CM2 chondrite dominated by two lithologies. Our X-ray computed tomography (XCT) results show many different lithologies. In this paper, we describe the petrographic and mineralogical investigation of five di...
Preprint
Full-text available
On February 6, 2016 at 21:07:19 UT, a very bright fireball was seen over the eastern part of Denmark. The weather was cloudy over eastern Denmark, but many people saw the sky light up-even in the heavily illuminated Copenhagen. Two hundred and thirty three reports of the associated sound and light phenomena were received by the Danish fireball netw...
Article
A key process in the early solar system that significantly affects the further evolution and transport of highly volatile elements throughout the solar system hydrothermal parent body alteration. To determine whether hydrothermal alteration in outer solar system parent bodies occurred more or less simultaneously or due to a sequence of multiple dif...
Article
Full-text available
On September 12, 2019 at 12:49:48 (UT) a bolide was observed by hundreds of eye-witnesses from the Netherlands, Ger- many, Belgium, Denmark and the UK. One day later a small meteorite stone was found by accident in Flensburg. The pres- ence of short-lived cosmogenic radionuclides with half-lives as short as 16 days proves the recent exposure of the...
Article
Full-text available
A large, igneous‐textured, and 2 cm‐sized spherical object from the L5/6 chondrite NWA 8192 was investigated for its chemical composition, petrography, O isotopic composition, and Hf‐W chronology. The petrography and chemical data indicate that this object closely resembles commonly found chondrules in ordinary chondrites and is therefore classifie...
Article
Full-text available
CM chondrites are complex impact (mostly regolith) breccias, in which lithic clasts show various degrees of aqueous alteration. Here, we investigated the degree of alteration of individual clasts within 19 different CM chondrites and CM‐like clasts in three achondrites by chemical analysis of the tochilinite‐cronstedtite‐intergrowths (TCIs; formerl...
Conference Paper
Full-text available
Petrography, mineralogy, chemistry, and isotopic composition of an unusual “metal-rich lithology” from the fresh fall carbonaceous chondrite breccia Aguas Zarcas.
Article
Ancient, SiO2‐rich achondrites have previously been proposed to have formed by disequilibrium partial melting of chondrites. Here, we test the alternative hypothesis that these achondrites formed by fractional crystallization of impact melts of Rumuruti (R) chondrites. We identified two new melt clasts in R chondrites, one in Pecora Escarpment (PCA...
Article
Volatile-rich, CI- and CM-like clasts occur in different brecciated achondrite and chondrite groups. The CI-like clasts in HEDs, polymict ureilites, as well as ordinary, CR, and CB chondrites have a similar mineralogy, indicating a similar alteration history. However, when viewed in detail, their mineral chemistry shows some minor differences betwe...
Article
Full-text available
One approach to decipher the dynamics of material transport and planetary accretion in the early solar system is to investigate xenolithic fragments in meteorites. In this work, we examined an igneous fragment from the NWA 12651 meteorite—the first igneous fragment found in any CM chondrite—by analyzing its mineralogy, rare earth elements (REEs), a...
Presentation
Full-text available
Carbon, the 4th most abundant element in our solar system, is a key element for tracing Earth’s volatile element inventory. Meteorites, considered to be analogues for building blocks of terrestrial planets, exhibit several carbon-bearing phases including graphite. Therefore, the characterization of meteoritic graphite and its understanding as a car...
Article
Full-text available
For the bulk rocks of CI chondrites, various values are given for the modal abundance of matrix (95–100 vol%) and the accompanying mineral constituents. Here, we have determined the modal abundance of phases >5 μm in the CI chondrites Orgueil, Ivuna, Alais, and Tonk. Considering this cut-off grain-size to distinguish between matrix and coarse-grain...
Conference Paper
Full-text available
The main mineralogical characteristics of a large light-colored clast within the Murchison CM2 breccia are discussed in detail including data on the mineralogy, bulk chemistry, organics, and oxygen isotopes.
Article
Deciphering aspects of the solar system’s formation process and the origin of planetary bodies can be achieved by examining primitive solar system materials, as these materials reflect the early solar system composition and may represent the building blocks of planetary bodies. Along these lines, knowing the original composition of carbonaceous cho...
Article
On July 10, 2018 at 21:29 UT extended areas of South-Western Germany were illuminated by a very bright bolide. This fireball was recorded by instruments of the European Fireball Network (EN). The records enabled complex and precise description of this event including the prediction of the impact area. So far six meteorites totaling about 1.23 kg ha...
Conference Paper
Full-text available
Introduction: Corundum (Al 2 O 3) is one of the first minerals predicted to condense from a gas of solar composition at pressures <10-3 atm [1,2]. However, because it reacts with the cooling solar gas to form hibonite-and later grossite and melilite-corundum is rarely found in meteorites. Since corundum represents such an early formed phase, it is...
Article
On February 6, 2016 at 21:07:19 UT, a very bright fireball was seen over the eastern part of Denmark. The weather was cloudy over eastern Denmark, but many people saw the sky light up—even in the heavily illuminated Copenhagen. Two hundred and thirty three reports of the associated sound and light phenomena were received by the Danish fireball netw...
Article
Full-text available
The main mineralogical characteristics of a large light-colored clast within the Murchison CM breccia are dis- cussed in detail including data on the mineralogy, bulk chemistry, organics, and oxygen isotopes. Petrographic study shows that the white clast consists of two areas with different granoblastic textures: (1) a coarse-grained (average grain...
Article
The brecciation and shock classification of 2280 ordinary chondrites of the meteorite thin section collection at the Institut für Planetologie (Münster) has been determined. The shock degree of S3 is the most abundant shock stage for the H and LL chondrites (44% and 41%, respectively), while the L chondrites are on average more heavily shocked havi...
Article
An important question regarding the formation of the solar system is how planetary bodies developed from dust and ice into the planets and planetary bodies. A particularly interesting topic is the thermal evolution of carbonaceous chondrites and volatile-rich clasts that could have originated from CM- and CI-like parent bodies. Two types of these v...
Conference Paper
Full-text available
Introduction: Ca,Al-rich inclusions (CAIs) are regarded as the first material which condensed from a hot solar nebula (e.g., [1]). They mainly consist of refractory Ca, Al, Mg, and Ti-rich oxides and silicates. The presence of moderately volatile or volatile elements indicates low temperature alteration on their distinct parent bodies or in the sol...
Conference Paper
Full-text available
Introduction: In general, CM chondrites are complex impact (mostly regolith) breccias. The lithic clasts are typically related to CM chondrites, but can show different stages of alteration (e.g., [1-3]). On the one hand, CM-like clasts are widespread within other achondrite (HEDs) and chondrite groups (ordinary and carbonaceous) as xenoliths (e.g.,...
Poster
Full-text available
We characterize the mineralogy of a white clast from Murchison (CM2), which was considered as R-chondrite, and compared it with those of R-chondrites in order to test, whether this clast is a real R-chondrite or a unique recrystallized chondrite?
Article
Meteoritic breccias are valuable samples as they can contain rare materials from the early solar system as clasts. Volatile‐rich, CI‐ and CM‐like clasts may represent parent body lithologies, which cannot be found as individual meteorites in today's meteorite collections. In order to reveal a better knowledge about the presence and chemical charact...
Article
After accretion of meteorite parent bodies, larger and smaller collisions have led to significant modifications of these bodies. Involved processes include excavation of material, thermal metamorphism, melting, mixing of different materials, re-accretion, and re-lithification. All these processes can be repeated several times. In this study polishe...
Article
In order to provide spectral ground truth data for remote sensing applications, we have measured mid-infrared spectra (2-18 µm) of three typical, well-defined lithologies from the Chelyabinsk meteorite that fell on February 15, 2013, near the city of Chelyabinsk, southern Urals, Russia. These lithologies are classified as (a) moderately shocked, li...

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Projects

Project (1)
Project
Determine the nature and processes of volatile-rich clasts in various brecciated meteorites