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
收藏
页码：2048 / 2052
页数：5
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