scholarly journals The Kumtag Meteorite Strewn Field

2020 ◽  
Author(s):  
Ke Du ◽  
Shijie Li ◽  
Ingo Leya ◽  
Thomas Smith ◽  
Dongliang Zhang ◽  
...  
Keyword(s):  
Total Mass ◽  
Cosmic Ray ◽  
Parent Body ◽  
Ordinary Chondrite ◽  
Impact Event ◽  
Exposure Age ◽  
H Chondrites ◽  
Cosmic Ray Exposure Age

Abstract The Kumtag meteorite strewn field was found in the Kumtag desert, 132 kilometers south of Hami city in the Xinjiang province, China. It is an ellipse of 2.5×7.9 km, with a long axis extending along the northeast-southwest direction. The largest individual meteorite of the strewn field weights about 10 kg; the smallest individual has as mass of only 27 g. In total more than 100 individuals with a total mass of more than 180 kg were collected. The Kumtag meteoroid entered the atmosphere in the direction Northeast-Southwest. All meteorites collected in this strewn field are samples from the same unique meteorite shower. The Kumtag meteorite is an H5 ordinary chondrite with a shock stage S2, and a weathering grade W2. The cosmic ray exposure age of Kumtag is 6.7± 0.8 Ma, which is rather typical for H chondrites and which indicates that Kumtag was derived from the massive impact event on its parent body ~7 Ma ago. A significant He amount has been released during certain unknown processe(s) before the Kumtag meteorite was ejected from its parent body.

Cosmic‐ray exposure age and heliocentric distance of the parent body of the Rumuruti chondrite PRE 95410

2020 ◽  
Vol 55 (5) ◽  
pp. 1031-1047
Author(s):  
Tomoya Obase ◽  
Daisuke Nakashima ◽  
Tomoki Nakamura ◽  
Keisuke Nagao
Keyword(s):  
Heliocentric Distance ◽  
Cosmic Ray ◽  
Parent Body ◽  
Exposure Age ◽  
Cosmic Ray Exposure Age

scholarly journals Petrology, geochemistry, and cosmic-ray exposure age of Iherzolitic shergottite Northwest Africa 1950

2005 ◽  
Vol 40 (8) ◽  
pp. 1175-1184 ◽  
Author(s):  
P. GILLET ◽  
J. A. BARRAT ◽  
P. BECK ◽  
B. MARTY ◽  
R. C. GREENWOOD ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Northwest Africa ◽  
Exposure Age ◽  
Cosmic Ray Exposure Age

scholarly journals Cosmic Ray Exposure Age Determinations of Cosmic Spherules from Marine Sediments

1985 ◽  
Vol 85 ◽  
pp. 179-181
Author(s):  
Kazuo Yamakoshi
Keyword(s):  
Mass Spectrometry ◽  
Cosmic Ray ◽  
High Energy ◽  
High Energy Accelerator ◽  
Exposure Age ◽  
Cosmic Spherules ◽  
Inner Region ◽  
Exposure Ages ◽  
Cosmic Ray Exposure Age ◽  
Cosmic Ray Exposure Ages

AbstractThe cosmic ray exposure ages of deep sea metalic lie spherules were determined by various methods; low level countings (Ni-59), neutron activation analysis (Mn-53), high energy accelerator mass spectrometry (Be-10, Al-26) and mass spectrometry (K isotopes). The exposure ages of 0.3 - 50 Ma were obtained. According to Poynting-Robertson effect, the starting points (supplying sources) are located at inner region of the orbit of Saturn.

Carbonaceous chondrite meteorites experienced fluid flow within the past million years

Science ◽  
2021 ◽  
Vol 371 (6525) ◽  
pp. 164-167
Author(s):  
Simon Turner ◽  
Lucy McGee ◽  
Munir Humayun ◽  
John Creech ◽  
Brigitte Zanda
Keyword(s):  
Fluid Flow ◽  
Solar System ◽  
Cosmic Ray ◽  
Parent Body ◽  
Uranium Isotopes ◽  
The Past ◽  
Uranium Ion ◽  
Impact Heating ◽  
The Impact ◽  
Cosmic Ray Exposure Age

Carbonaceous chondritic meteorites are primordial Solar System materials and a source of water delivery to Earth. Fluid flow on the parent bodies of these meteorites is known to have occurred very early in Solar System history (first <4 million years). We analyze short-lived uranium isotopes in carbonaceous chondrites, finding excesses of 234-uranium over 238-uranium and 238-uranium over 230-thorium. These indicate that the fluid-mobile uranium ion U6+ moved within the past few 100,000 years. In some meteorites, this time scale is less than the cosmic-ray exposure age, which measures when they were ejected from their parent body into space. Fluid flow occurred after melting of ice, potentially by impact heating, solar heating, or atmospheric ablation. We favor the impact heating hypothesis, which implies that the parent bodies still contain ice.

scholarly journals Cosmic-ray exposure age and preatmospheric size of the Bunburra Rockhole achondrite

2011 ◽  
Vol 47 (2) ◽  
pp. 186-196 ◽  
Author(s):  
Kees C. WELTEN ◽  
Matthias M. M. MEIER ◽  
Marc W. CAFFEE ◽  
Matthias LAUBENSTEIN ◽  
Kunihiko NISHIZUMI ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Exposure Age ◽  
Cosmic Ray Exposure Age

Cosmic-ray exposure age of Martian meteorite GRV 99027

2007 ◽  
Vol 50 (10) ◽  
pp. 1521-1524 ◽  
Author(s):  
Ping Kong ◽  
D. Fabel ◽  
R. Brown ◽  
S. Freeman
Keyword(s):  
Cosmic Ray ◽  
Martian Meteorite ◽  
Exposure Age ◽  
Cosmic Ray Exposure Age

Review of asteroid-family and meteorite-type links

2018 ◽  
Vol 14 (A30) ◽  
pp. 9-12 ◽  
Author(s):  
Peter Jenniskens
Keyword(s):  
Source Region ◽  
Cosmic Ray ◽  
Major Axis ◽  
Main Belt ◽  
Semi Major Axis ◽  
Collision Event ◽  
Exposure Age ◽  
Statistical Sense ◽  
Cosmic Ray Exposure Age ◽  
Asteroid Families

AbstractThe materials of large asteroids and asteroid families are sampled by meteorites that fall to Earth. The cosmic ray exposure age of the meteorite identifies the collision event from which that meteorite originated. The inclination of the orbit on which the meteoroid impacted Earth measures the inclination of the source region, while the semi-major axis of the orbit points to the delivery resonance, but only in a statistical sense. To isolate the sources of our meteorites requires multiple documented falls for each cosmic ray exposure peak. So far, only 36 meteorites have been recovered from observed falls. Despite these low numbers, some patterns are emerging that suggest CM chondrites originated from near the 3:1 resonance from a low-inclined source (perhaps the Sulamitis family), LL chondrites came to us from the ν6 resonance (perhaps the Flora family), there is an H chondrite source at high inclination (Phocaea?), and one group of low shock-stage L chondrites originates from the inner main belt. Other possible links are discussed.

Noble gas and cosmic-ray exposure age of Juancheng chondrite

1999 ◽  
Vol 44 (12) ◽  
pp. 1142-1143 ◽  
Author(s):  
Daode Wang ◽  
Ruitian Wang
Keyword(s):  
Noble Gas ◽  
Cosmic Ray ◽  
Exposure Age ◽  
Cosmic Ray Exposure Age
Sign in / Sign up

Export Citation Format

Share Document