Samuel Ebert

Samuel Ebert
University of Münster | WWU · Institute of Planetology

PhD

About

30
Publications
2,833
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
213
Citations
Citations since 2016
26 Research Items
213 Citations
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
Introduction
Skills and Expertise

Publications

Publications (30)
Article
The early solar system was a dynamic period during which the formation of early solids set into motion the process of planet building. Although both astrophysical observations and theoretical modeling demonstrate the presence of widespread transport of material, we lack concrete quantitative constraints on timings, distances, and mechanisms thereof...
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
Understanding the genetic relationship between different chondritic components will help to decipher their origin and dynamical evolution within the protoplanetary disk. Here, we obtain insight into these processes by acquiring O-isotope data from 17 Al-rich chondrules from unequilibrated ordinary chondrites (OCs, petrologic type ≤3.2) and four Al-...
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...
Article
Calcium-aluminum-rich inclusions (CAIs) are highly refractory objects found in different chondrite groups and represent some of the oldest known solids of the Solar System. As such, CAIs provide key information regarding the conditions prevailing in the solar protoplanetary disk as well as subsequent mixing and transport processes. Many studies hav...
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...
Article
The nature of oxygen-isotope heterogeneity in refractory inclusions [Ca,Al-rich inclusions (CAIs) and amoeboid olivine aggregates (AOAs)] from weakly metamorphosed chondrites is one of the outstanding problems in cosmochemistry. To obtain insights into possible processes resulting in O-isotope heterogeneity of refractory inclusions, we investigated...
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...
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.
Conference Paper
Full-text available
Figure 3: CAI from NWA 3358 (H3.1) consists of nepheline and anorthite (partly altered), melilite, spinel, and perovskite; it is rimmed by Al-diopside. Figure 1: Na-Al-rich chondrule from NWA 3358 (H3.1) composed of magnesian olivine and high-Ca pyroxene phenocrysts embedded in a Na-rich glassy mesostasis. Figure 2: Na-Al-rich chondrule from NWA 33...
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
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
Insights into the earliest stages of our Solar System can be derived from its oldest dated solids, calcium-aluminum-rich inclusions (CAIs). In particular, investigating isotopic anomalies of nucleosynthetic origin in CAIs offers potential clues to the genetic heritage of refractory inclusions and the reservoir(s) involved in their formation. To thi...
Article
Full-text available
Based on the high abundance of fine‐grained material and its dark appearance, NWA 11024 was recognized as a CM chondrite, which is also confirmed by oxygen isotope measurements. But contrary to known CM chondrites, the typical phases indicating aqueous alteration (e.g., phyllosilicates, carbonates) are missing. Using multiple analytical techniques,...
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
Calcium-aluminum-rich inclusions (CAIs) are the oldest dated materials in the Solar System and numerous previous studies have revealed nucleosynthetic anomalies relative to terrestrial rock standards in many isotopic systems. However, most of the isotopic data from CAIs has been limited to the Allende meteorite and a handful of other CV3 chondrites...
Article
On March 6, 2016 at 21:36:51 UT, extended areas of Upper Austria, Bavaria (Germany) and the southwestern part of the Czech Republic were illuminated by a very bright bolide. This bolide was recorded by instruments in the Czech part of the European Fireball Network and it enabled complex and precise description of this event including prediction of...
Conference Paper
Full-text available
Claromecó in Argentina is a L5/6 ordinary chondrite found in the Argentine Pampas. Two reddish brown meteoritic stones weighing 13 kg each were found in 1963 by Mr. Fermín Massigogge leaning against a windmill on his farm. The owner knew well the exact location where he found the stones: Longitude: 60.1231º W and Latitude: 38.8044º S. No other spec...
Article
Al-rich objects (Ca,Al-rich inclusions (CAIs), Al-rich chondrules, Al-rich fragments) occur in all chondrite classes. These objects can be centimeter-sized in CV3 carbonaceous chondrites, but they are generally much smaller in other chondrite groups and classes. Within the ordinary chondrites, most Al-rich objects are chondrules that vary from Ca-...
Conference Paper
Full-text available
Surface emissivity is difficult and error-prone to retrieve from VIRTIS measurements of Venus’ nightside. A detailed radiative transfer forward model simulation is used to generate synthetic spectra for given atmospheric and surface parameters. The new MSR multi-spectrum retrieval technique is applied to retrieve atmospheric and surface parameters...

Network

Cited By

Projects

Projects (2)
Project
Meteorites classified as CM chondrites have -next to CI chondrites- the highest degree of aqueous alteration. Additionally, almost all of these carbonaceous chondrites are heavily brecciated and contain clasts of different mineralogy and chemistry. Therefore, they carry information about material transport through the solar disc as well as about the earliest processes, like aqueous alteration and thermal metamorphism, on the CM parent body(ies).