Kaprada L(5/6) chondrite: Chemistry, petrography, noble gases and nuclear tracks

被引：13

作者：

Bhandari, N. ^{[1
,2
]}

Murty, S. V. S. ^{[1
]}

Mahajan, R. R. ^{[1
]}

Parthasarathy, G. ^{[4
]}

Shukla, P. N. ^{[1
]}

Sisodia, M. S. ^{[3
]}

Rai, V. K. ^{[1
]}

机构：

[1] Phys Res Lab, Ahmadabad 380009, Gujarat, India

[2] Basic Sci Res Inst, Ahmadabad 380009, Gujarat, India

[3] Jai Narain Vyas Univ, Dept Geol, Jodhpur 342005, Rajasthan, India

[4] CSIR, Natl Geophys Res Inst, Hyderabad 500007, Andhra Pradesh, India

来源：

PLANETARY AND SPACE SCIENCE | 2009年 / 57卷 / 14-15期

关键词：

Kaparada meteorite; Noble gases; Exposure age; Pre-atmospheric size; ISOTOPES;

D O I：

10.1016/j.pss.2009.09.008

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A single stone weighing about 1.6 kg fell in Kaprada village of south Gujarat, India in October, 2004. It has been studied for mineralogy, petrography, chemical and isotopic composition and cosmogenic effects. The olivine is 23.7% fayalite. The petrography, bulk chemistry and oxygen isotopic composition indicate that it belongs to L(5/6) group of chondrites. The cosmic ray exposure age of the meteorite is estimated to be 11.4 Ma based on He, Ne and At isotopes. A trapped nitrogen amount of 0.25 ppm with delta N-15=4.7 +/- 0.3 parts per thousand is typical of ordinary chondrites of higher metamorphic grade. The gas retention ages, based on U/Th-He-4 and K-Ar-40 are calculated to be 2.6 and 4.1 Ga, respectively. Cosmic ray track data indicate that the pre-atmospheric radius of the meteorite was about 7 cm, and about 75% mass was ablated during its journey through the Earth's atmosphere. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：2048 / 2052

页数：5

共 14 条

[1] ATMOSPHERIC ABLATION IN METEORITES - A STUDY BASED ON COSMIC-RAY TRACKS AND NEON ISOTOPES
BHANDARI, N
LAL, D
RAJAN, RS
ARNOLD, JR
MARTI, K
MOORE, CB
[J]. NUCLEAR TRACKS AND RADIATION MEASUREMENTS, 1980, 4 (04): : 213 - 262
[2] Stony meteorite porosities and densities: A review of the data through 2001
Britt, DT
Consolmagno, GJ
[J]. METEORITICS & PLANETARY SCIENCE, 2003, 38 (08) : 1161 - 1180
[3] OXYGEN ISOTOPE STUDIES OF ORDINARY CHONDRITES
CLAYTON, RN
MAYEDA, TK
GOSWAMI, JN
OLSEN, EJ
[J]. GEOCHIMICA ET COSMOCHIMICA ACTA, 1991, 55 (08) : 2317 - 2337
[4] COSMIC-RAY PRODUCTION-RATES FOR HE-3, NE-21, AR-38, KR-83, AND XE-126 IN CHONDRITES BASED ON 81KR-KR EXPOSURE AGES
EUGSTER, O
[J]. GEOCHIMICA ET COSMOCHIMICA ACTA, 1988, 52 (06) : 1649 - 1662
[5] Eugster O., 2006, Meteorites and the Early Solar System II, P829
[6] Grady M., 2000, CATALOGUE METEORITES, P689
[7] NITROGEN ISOTOPES IN BULK ORDINARY CHONDRITES
HASHIZUME, K
SUGIURA, N
[J]. GEOCHIMICA ET COSMOCHIMICA ACTA, 1995, 59 (19) : 4057 - 4069
[8] COSMIC-RAY EXPOSURE HISTORY OF ORDINARY CHONDRITES
MARTI, K
GRAF, T
[J]. ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES, 1992, 20 : 221 - 243
[9] MURRY SVS, 1998, METEORIT PLANET SCI, V33, P1311
[10] MURRY SVS, 1997, METEORIT PLANET SCI, V32, P687

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