The ungrouped chondrite El Médano 301 and its comparison with other reduced ordinary chondrites

Pourkhorsandi, Hamed; Gattacceca, J.; Devouard, Bertrand; D’Orazio, Massimo; Rochette, P.; Beck, Pierre; Sonzogni, Corinne; Valenzuela, M.

doi:10.1016/j.gca.2017.09.013

Cited by 13 publications

(37 citation statements)

References 76 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast to what has been observed in El Médano 301 (Pourkhorsandi et al. ), taenite has not been detected in Acfer 370, although its presence cannot be ruled out.…”

Section: Resultscontrasting

confidence: 70%

“…As pointed out by Pourkhorsandi et al. () in the case of El Médano 301, the texture of this “matrix” often appears similar to the remnant of metal/sulfides‐silicate intergrowths observed in some EC (Lin and Kimura ; Van Niekerk and Keil ; Rubin and Wasson ; Horstmann et al. ).…”

Section: Resultssupporting

confidence: 56%

“…An additional noteworthy feature is the high Ba content, which probably reflects the influence of terrestrial weathering (Pourkhorsandi et al. ). Acfer 370 also has a high content of Pb and U.…”

Section: Resultsmentioning

confidence: 99%

“…It is a chondrite containing olivine and low‐Ca pyroxene with a mean composition of Fa 3.9±0.3 and Fs 12.8±4.9 , respectively (Pourkhorsandi et al. , ).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A detailed mineralogical, petrographic, and geochemical study of the highly reduced chondrite, Acfer 370

Pratesi

Caporali

Greenwood

et al. 2019

Meteorit & Planetary Scien

View full text Add to dashboard Cite

Among the many ungrouped meteorites, Acfer 370, NWA 7135, and El Médano 301—probably along with the chondritic inclusion in Cumberland Falls and ALHA 78113—represent a homogeneous grouplet of strongly reduced forsterite‐rich chondrites characterized by common textural, chemical, mineralogical, and isotopic features. All of these meteorites are much more reduced than OCs, with a low iron content in olivine and low‐Ca pyroxene. In particular, Acfer 370 is a type 4 chondrite that has olivine and low‐Ca pyroxene compositional ranges of Fa 5.2–5.8 and Fs 9.4–33.4, respectively. The dominant phase is low‐Ca pyroxene (36.3 vol%), followed by Fe‐Ni metal (16.3 vol%) and olivine (15.5 vol%); nevertheless, considering the Fe‐oxyhydroxide (due to terrestrial weathering), the original metal content was around 29.6 vol%. Finally, the mean oxygen isotopic composition Δ17O = +0.68‰ along with the occurrence of a silica phase, troilite, Ni‐rich phosphides, chromite, and oldhamite confirms that these ungrouped meteorites have been affected by strong reduction and are different from any other group recognized so far.

show abstract

“…In contrast to what has been observed in El Médano 301 (Pourkhorsandi et al. ), taenite has not been detected in Acfer 370, although its presence cannot be ruled out.…”

Section: Resultscontrasting

confidence: 70%

Section: Resultssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

“…It is a chondrite containing olivine and low‐Ca pyroxene with a mean composition of Fa 3.9±0.3 and Fs 12.8±4.9 , respectively (Pourkhorsandi et al. , ).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A detailed mineralogical, petrographic, and geochemical study of the highly reduced chondrite, Acfer 370

Pratesi

Caporali

Greenwood

et al. 2019

Meteorit & Planetary Scien

View full text Add to dashboard Cite

show abstract

“…; Pourkhorsandi et al. ), (2) providing more samples for statistical works on the meteorite flux (e.g., Bland et al. ), (3) studying meteorite fall process by mapping strewnfields resulting from meteorite showers (e.g., Kring et al.…”

Section: Introductionmentioning

confidence: 99%

Meteorites from the Lut Desert (Iran)

Pourkhorsandi

Gattacceca

Rochette

et al. 2019

Meteorit & Planetary Scien

Self Cite

View full text Add to dashboard Cite

We present for the first time a detailed report on the discovery of a new meteorite collection region in the Lut Desert, eastern–southeastern Iran, describing its geological, morphological, and climatic setting. Our search campaigns, alongside with the activity of meteorite hunters, yielded >200 meteorite finds. Here, we report on their classification, spatial distribution, and terrestrial weathering. All the collected meteorites are ordinary chondrites (OCs). The most abundant by far are the highly weathered paired H5 distributed in the northwest of Kalut area (central Lut, Kerman dense collection area). The second are well‐preserved paired L5 also found in Kalut region. A detailed study of the geochemistry and mineralogy of selected meteorites reveals significant effects of terrestrial weathering. Fe,Ni metal (hereafter simply metal) and troilite are transformed into Fe oxyhydroxides. A rather unusual type of troilite weathering to pyrite/marcasite is observed in most of the Lut Desert meteorites. Magnetic measurements and X‐ray diffractometry confirm the occurrence of terrestrial weathering products, with the dominance of maghemite, goethite, and hematite. Mobile elements, such as Li, Sr, Mo, Ba, Tl, Th, and U, are enriched with respect to fresh falls. Meanwhile, a decrease in the V, Cr, Co, Rb (and possibly Fe) due to terrestrial weathering is detectable. The total carbon and CaCO3 is higher than in samples from other hot deserts. The weathering effects observed in the Lut Desert OCs can be used as distinctive indicators to distinguish them from meteorites from other regions of the Earth. Measurements of terrestrial age (14C) show a range of 10–30 ka, which is in the range of ages reported for meteorites from other hot deserts except the Atacama Desert (Chile). Considering the high potential of the Lut Desert in meteorite preservation, systematic works should lead to the discovery of more samples giving access to interesting material for future studies.

show abstract

Towards a Latin American Geoethics?

Lorenzo

2018

The Latin American Studies Book Series

View full text Add to dashboard Cite

The Latin American Studies Book Series promotes quality scientific research focusing on Latin American countries. The series accepts disciplinary and interdisciplinary titles related to geographical, environmental, cultural, economic, political and urban research dedicated to Latin America. The series publishes comprehensive monographs, edited volumes and textbooks refereed by a region or country expert specialized in Latin American studies.The series aims to raise the profile of Latin American studies, showcasing important works developed focusing on the region. It is aimed at researchers, students, and everyone interested in Latin American topics.

show abstract

The ungrouped chondrite El Médano 301 and its comparison with other reduced ordinary chondrites

Cited by 13 publications

References 76 publications

A detailed mineralogical, petrographic, and geochemical study of the highly reduced chondrite, Acfer 370

A detailed mineralogical, petrographic, and geochemical study of the highly reduced chondrite, Acfer 370

Meteorites from the Lut Desert (Iran)

Towards a Latin American Geoethics?

Contact Info

Product

Resources

About