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Sökning: WFRF:(Matsui Takafumi) > (2019) > Further evidence fo...

Further evidence for an impact origin of the Tsenkher structure in the Gobi-Altai, Mongolia : Geology of a 3.7 km crater with a well-preserved ejecta blanket

Komatsu, Goro (författare)
University G.d'Annunzio of Chieti-Pescara
Ormö, Jens (författare)
National Institute of Aerospace Technology
Bayaraa, Togookhuu (författare)
Institute of Astronomy and Geophysics, MAS
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Arai, Tomoko (författare)
Chiba Institute of Technology
Nagao, Keisuke (författare)
University of Tokyo
Hidaka, Yoshihiro (författare)
Tokyo Metropolitan University
Shirai, Naoki (författare)
Tokyo Metropolitan University
Ebihara, Mitsuru (författare)
Tokyo Metropolitan University
Alwmark, Carl (författare)
Lund University,Lunds universitet,Berggrundsgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Lithosphere and Biosphere Science,Department of Geology,Faculty of Science
Gereltsetseg, Lkhagva (författare)
Institute of Paleontology and Geology at Mongolian Academy of Science
Tserendug, Shoovdor (författare)
Institute of Astronomy and Geophysics, MAS
Goto, Kazuhisa (författare)
Tohoku University
Matsui, Takafumi (författare)
Chiba Institute of Technology
Demberel, Sodnomsambuu (författare)
Institute of Astronomy and Geophysics, MAS
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University Gd'Annunzio of Chieti-Pescara National Institute of Aerospace Technology (creator_code:org_t)
2019
2019
Engelska 24 s.
Ingår i: Geological Magazine. - 0016-7568. ; 156:1, s. 1-24
Relaterad länk:
http://dx.doi.org/10...
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https://lup.lub.lu.s...
https://doi.org/10.1...
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  • Forskningsöversikt (refereegranskat)
Abstract Ämnesord
Stäng  
  • The Tsenkher structure in the Gobi-Altai, Mongolia is a c. 3.7 km diameter crater with a well-preserved ejecta blanket. It has been hypothesized to be either of impact or volcanic origin in our previous work. Observations during our 2007 expedition and related sample analyses give further support for an impact origin. The evidence includes the presence of a structurally uplifted near-circular rim surrounded by an ejecta blanket, and abundant breccias, some of which are melt- A nd millimetre-scale spherule-bearing. Planar deformation features (PDFs) were found in one quartz grain in a breccia sample. Fe-rich grains are found in a vesicular melt sample that is also characterized by elevated platinum group element (PGE) abundances with respect to the sedimentary bedrock of the area (approximately an order of magnitude). Noble gas analysis of one breccia sample yielded an elevated 3He/4He value of (5.0±0.2) × 10-6. Although not conclusive alone, these geochemical results are consistent with a contribution of meteoritic components. A volcanic origin, in particular a maar formation, would require explanations for the unusual conditions associated with Tsenkher, including its large size occurring in isolation, the structurally uplifted rim and the lack of a bedded base surge deposit. A pronounced rampart structure observed at the eastern ejecta is also unusual for any volcanic origin. 40Ar-39Ar dating of a vesicular melt sample gives an age of the Tsenkher structure of 4.9±0.9 Ma. The rampart structure could provide insights into the formation of similar ejecta morphologies associated with numerous impact craters on Mars.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geology (hsv//eng)

Nyckelord

breccia
ejecta
impact crater
maar
Mongolia
raised rim
Tsenkher

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