Noble gas and nitrogen isotopic compositions of Karimati ordinary (L5) chondrite are presented. Aliquots of the meteorite were studied in two noble gas mass spectrometers. Its cosmic ray exposure (CRE) history, trapped noble gases and nitrogen isotopic systematic are examined. The compositions of Ne and Kr in this meteorite indicate presence of mixture of solar wind and Q trapped components. In addition to the primordial components, radiogenic ¹²⁹Xe (from the decay of short-lived radioactive ¹²⁹I) is observed in the two aliquots (¹²⁹Xe/¹³²Xe ranges between 1.054 and 1.311). The U/Th-⁴He and K-⁴⁰Ar ages are discordant. U/Th-⁴He ages are younger than the K-⁴⁰Ar ages, indicating loss of helium. The trapped N component is isotopically light analogous to Q gas/solar wind. The cosmic-ray exposure ages of the two aliquots are 16.1 ± 2.7 Ma and 16.6 ± 2.0 Ma based on the cosmogenic ²¹Ne_c and ³⁸Ar_c concentrations.

介绍了卡里马蒂普通 (L5) 球粒陨石的稀有气体和氮同位素组成。在两台惰性气体质谱仪中研究了陨石的等分试样。对其宇宙射线暴露（CRE）历史、捕获的稀有气体和氮同位素系统进行了检查。该陨石中氖和氪的成分表明存在太阳风和 Q 捕获成分的混合物。除了原始成分外，还在两个等分试样中观察到放射性^{129 Xe（来自短寿命放射性129} I的衰变）（ ¹²⁹ Xe/ ¹³² Xe 范围在 1.054 和 1.311 之间）。 U/Th- ⁴ He 和 K- ⁴⁰ Ar 年龄不一致。 U/Th- ^{4 He 年龄比 K- 40} Ar 年龄更年轻，表明氦气损失。捕获的 N 成分是同位素轻的，类似于 Q 气体/太阳风。根据宇宙成因²¹ Ne _c和³⁸ Ar _c浓度，两份等份的宇宙射线暴露年龄分别为 16.1 ± 2.7 Ma 和 16.6 ± 2.0 Ma。