极地研究

极地研究 ›› 2025, Vol. 37 ›› Issue (3): 510-521.DOI: 10.13679/j.jdyj.20240044

• 研究论文 • 上一篇    下一篇

顽火辉石球粒陨石GRV 13100两类球粒和NWA 13632热变质历史对比

高旭凯1, 2, 谢兰芳1, 2, 陈宏毅1, 3, 杨姗姗4, 夏志鹏1, 2, 殷一曼1, 2, 赵妍菲1, 2   

  1. 1桂林理工大学行星地质演化广西高校重点实验室 陨石与行星物质研究中心，广西 桂林 541006; 
    2桂林理工大学广西隐伏金属矿产勘查重点实验室, 广西 桂林 541006; 
    3桂林理工大学有色金属矿产勘查与资源高效利用省部共建协同创新中心, 广西 桂林 541004; 
    4中国科学院广州地球化学研究所, 同位素地球化学国家重点实验室, 广东 广州 510640
  • 收稿日期:2024-04-23 修回日期:2024-09-29 出版日期:2025-09-30 发布日期:2025-09-25
  • 通讯作者: 谢兰芳
  • 基金资助:
    国家自然科学基金、广西自然科学基金、广西科技基地与人才专项和桂林理工大学科研启动金

Comparison of the thermal metamorphic history between two types of chondrules in GRV 13100 and NWA 13632 enstatite chondrites

GAO Xukai1, 2, XIE Lanfang1, 2, CHEN Hongyi1, 3, YANG Shanshan4, XIA Zhipeng1, 2, YIN Yiman1, 2, ZHAO Yanfei1, 2   

  1. 1Institute of Meteorite and Planetary Material Research, Key Laboratory of Planetary Geological Evolution of Guangxi Provincial Universities, Guilin University of Technology, Guilin 541006, China;
    2Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin University of Technology, Guilin 541006, China;
    3Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi, Guilin University of Technology, Guilin 541004, China;
    4State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
  • Received:2024-04-23 Revised:2024-09-29 Online:2025-09-30 Published:2025-09-25

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摘要： 本文报道了顽火辉石球粒陨石GRV 13100(EH4)中斑状橄榄石辉石球粒、炉条状辉石球粒和NWA 13632(EH6)整体岩石矿物学特征, 并对它们的热变质历史进行了对比研究。GRV 13100斑状橄榄石辉石球粒中两种不同阴极发光的橄榄石、陨硫钙矿温度计等表明, 该球粒经历了800~900 ℃不完全熔融和快速的冷却结晶; 炉条状辉石球粒经历了高于1315 ℃的完全高温熔融和大于1000 ℃·h–1的冷却速率; 它们的热变质特征符合“碎石堆”模型, 由冲击动能提供变质热源。NWA 13632热变质程度(6型)和风化程度高(W3), 球粒与基质界线模糊; 冲击变质程度低(S2), 无冲击熔融现象; 残余球粒和基质中未发现橄榄石和二氧化硅相, 与GRV 13100相比, 其顽火辉石和陨硫铁中Mn含量低, 部分区域次生斜长石与辉石构成等粒结构; 其热变质特征符合“洋葱”模型, 陨石可能形成于母体较深处, 由放射性元素衰变提供热源。

关键词: 顽火辉石球粒陨石, 岩石学, 矿物学, 热变质, GRV 13100, NWA 13632

Abstract: The characteristics of petrology and mineralogy for porphyritic olivine pyroxene chondrule and barred pyroxene chondrule in GRV 13100 (EH4) and the whole rock in NWA 13632 (EH6) enstatite chondrite are reported in this paper, and the comparative study of their thermal metamorphic history are carried out. Two different cathodolumine-scence olivine, thermometers of oldhamite of porphyritic olivine pyroxene chondrule in GRV 13100 show that the chondrule have undergone incomplete melting of 800~900 ℃ and rapid cooling crystallization. The barred pyroxene chondrule in GRV 13100 underwent complete high-temperature melting higher than 1315 ℃, and the cooling rate was greater than 1 000 ℃·h-1. Their thermal metamorphic characteristics conform to the “rubble pile model”, and the metamorphic heat source comes from the impact energy. NWA 13632 enstatite chondrite has a high degree of thermal metamorphism (type 6) and weathering (W3), a blurred boundary between chondrule and matrix, a low impact metamorphism (S2), no impact melting phenomenon; The olivine and silica phases are absent in the residual spherules and matrix. Compared with GRV 13100, the Mn content of enstatite and troilite in NWA 13632 is low, and the secondary plagioclase and pyroxene form an equigranular texture in some areas. So, its thermal metamorphism characteristics are consistent with the “onion model”. NWA13632 meteorite may have formed deep within its parent body and was heated by the decay of radioactive elements.

Key words: enstatite chondrite, petrology, mineralogy, thermal metamorphism, GRV 13100, NWA 13632