Multiple impact events on the L-chondritic parent body: Insights from SIMS U-Pb dating of Ca-phosphates in the NWA 7251 L-melt breccia
Li, Ye; Hsu, Weibiao
2018
发表期刊METEORITICS & PLANETARY SCIENCE
卷号53期号:5页码:1081-1095
摘要Here we report in situ secondary ionization mass spectrometry Ca-phosphate U-Pb ages for an L-impact melt breccia (NWA 7251), which are integrated with petrological and mineral chemical studies of this meteorite. NWA 7251 is a heavily shocked rock that is composed mainly of the chondrite host, impact melt portion, and melt veins (crosscutting and pervasive type). The host is an L4 chondrite that has been shocked to S4. The impact melt portion has a fine-grained igneous texture, and is composed mainly of olivine, low-Ca pyroxene, high-Ca pyroxene, and albitic glass. The impact melt was generated at pressure of >30-35 GPa and temperature of >1300-1500 degrees C during an impact event. The Ca-phosphate grains in the host were affected by a shock heating event. Most of the Ca-phosphate grains in the melt were neocrystallized, but relatively large grains enclosed by or adjacent to metal veins or melt globules are likely inherited. The U-Pb isotopic systematics of Ca-phosphates in NWA 7251 yield an upper intercept age of 4457 +/- 56 Ma and a lower intercept age of 574 +/- 82 Ma on the normal U-Pb concordia diagram. The age of 4457 +/- 56 Ma is interpreted to be related to an early shocking event rather than the thermal metamorphism of the parent body. The impact melt and veins in NWA 7251 were generated at 574 +/- 82 Ma, resulting from disruption of the L chondrite parent body.
语种英语
WOS记录号WOS:000431665400009
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/18080
专题近地天体探测和太阳系天体研究团组
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Li, Ye,Hsu, Weibiao. Multiple impact events on the L-chondritic parent body: Insights from SIMS U-Pb dating of Ca-phosphates in the NWA 7251 L-melt breccia[J]. METEORITICS & PLANETARY SCIENCE,2018,53(5):1081-1095.
APA Li, Ye,&Hsu, Weibiao.(2018).Multiple impact events on the L-chondritic parent body: Insights from SIMS U-Pb dating of Ca-phosphates in the NWA 7251 L-melt breccia.METEORITICS & PLANETARY SCIENCE,53(5),1081-1095.
MLA Li, Ye,et al."Multiple impact events on the L-chondritic parent body: Insights from SIMS U-Pb dating of Ca-phosphates in the NWA 7251 L-melt breccia".METEORITICS & PLANETARY SCIENCE 53.5(2018):1081-1095.
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